Graphene, or the expected revolution in electronics: coming soon

Thibaut LalireIMT Mines Alès – Institut Mines-Télécom

“Material of the 21st century,” a “revolutionary material”: these are some of the ways graphene has been described since it was discovered in 2004 by Konstantin Novoselov and Andre Geim. The two scientists’ research on graphene won them the Nobel Prize in Physics in 2010. But how do things stand today – seventeen years after its discovery?

Graphene is known worldwide for its remarkable properties, whether mechanical, thermal or electrical. Its perfect honeycomb structure composed of carbon atoms is the reason why graphene is a high-performance material that can be used in numerous fields. Its morphology, in the form of a sheet just one atom thick, makes it part of the family of 2D materials. Manufacturers have stepped up research on this material since its discovery, and a wide range of applications have been developed, in particular by taking advantage of graphene’s electrical performance. Many sectors are targeted, such as aeronautics, the automotive industry and telecommunications.

Is there graphene in airplanes?

Graphene is used for its status as a champion of electrical conductivity, as well as for its low density and its flexibility. These properties allow it to join the highly exclusive club of materials used in  aeronautics.

Lightning and ice buildup are problems frequently encountered by airplanes at high altitudes. The impact of a lightning strike on a non-conductive surface causes severe damage that can even include the aircraft catching fire. The addition of graphene, with its high electrical conductivity, makes it possible to dissipate this high-energy current. Airplanes are designed in such a way so as to route the current as far as possible from risk areas – fuel tanks and control cables – and therefore prevent loss of control of the aircraft, or even explosion.

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The history of graphene starts here. Umberto/UnsplashCC BY

A coating composed of a resin reinforced with graphene, which is referred to as a “nanocomposite,” is used as an alternative to metal coating, since its low density makes it possible to obtain lighter materials than the original ones – limiting the aircraft’s mass, and therefore, its fuel consumption. But the electrically conductive materials required to dissipate the energy of the lightening strike have the drawback of reflecting electromagnetic waves, meaning that this kind of material cannot be used for stealth military applications.

To overcome this shortcoming, different forms of graphene have been developed to conserve its electrical conductivity while improving stealth. “Graphene foam” is one of these new structures. The wave penetrates the material, which creates a phenomenon in which the wave is reflected in all directions, trapping it and gradually suppressing its traces. It is not possible for the wave to return to the radar, so the aircraft becomes stealth. This is referred to as electromagnetic shielding.

Graphene for energy storage

Graphene has also become widely used in the field of electrical energy storage.

Graphene is an ideal candidate as an electrode for Li-ion batteries and supercapacitators. Its high electrical conductivity and high specific surface area (corresponding to the available surface on the graphene that can accommodate ions and facilitate the exchange of electrons between the graphene electrode and the lithium) makes it possible to obtain a large “storage capacity.” A large number of ions can easily insert themselves between the graphene sheets, which allows electrons to be exchanged with the current, increasing the battery’s electricity storage capacity, and therefore battery life. The ease with which ions can insert themselves into the graphene electrode and the high electrical conductivity of this material (for rapid electron transfer) result in a battery with a much shorter discharge/charge cycle. Graphene’s high conductivity makes it possible to deliver a great quantity of energy in a very short time, resulting in more powerful supercapacitators. Graphene is also a good thermal conductor, which limits temperature rise in batteries by dissipating the heat.

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Electric batteries are increasingly pervasive in our lives. Graphene could help improve their performance. Markus Spiske/UnsplashCC BY

At the industry level, Real Graphene has already developed an external battery that can completely recharge a mobile phone in 17 minutes. In an entirely different industry, Mercedes is working on a  prototype for a car with a battery composed of graphene electrodes, proclaimed to have a range of 700 kilometers for a 15-minute recharge  – at present, these values are quite surprising at first glance, especially for electric vehicles which require batteries with high storage capacity.

Making its way into the field of electronics

One area where graphene has struggled to set itself apart compared to semi-conductors is the field of electronics. Its electronic properties – due to its “band structure” – make it impossible to control electrons and graphene therefore behaves like a semi-metal. This means that the use of graphene for binary  – digital – electronics remains challenging, especially for transistors, which are instead composed of semi-conductors.

In order for graphene to be used in transistors, its band structure must be modified, which usually means degrading its honeycomb structure and other electrical properties. If we want to conserve this 2D structure, the chemical nature of the atoms that make up the material must be modified, for example by using boron nitride or transition metal dichalcogenides, which are also part of the family of 2D materials.

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Microscopy of the interface between graphene and boron nitride(h-BN). Oak Ridge National Laboratory, FlickrCC BY

If, however, we wish to use graphene, we must target applications in which mechanical properties (flexibility) are also sought, such as for sensors, electrodes and certain transistors reserved for analog electronics, like graphene field-effect transistors. The leading mobile phone companies are also working on developing flexible mobile phone screens for better ergonomics.

The manufacturing of the coming quantum computers may well rely on materials known as “topological insulators.” These are materials that are electrical conductors on their surface, but insulators at their core. Research is now focusing on the topological phase of graphene with electric conduction only at the edges.  

The wide variety of applications for graphene demonstrates the material’s vast potential and makes it possible to explore new horizons in a wide range of fields such as optoelectronics and spintronics.

This material has already proved itself in industry, but has not revolutionized it so far. However, ongoing research allows new fields of application to be discovered every year. At the same time, synthesis methods are continually being developed to reduce the price of graphene per kilogram and obtain a higher-quality material.

Thibaut Lalire, PhD student in material science, IMT Mines Alès – Institut -Télécom

This article has been republished from The Conversation under a Creative Commons license. Read the original article (in French).

Gouvernance des données

Data governance: trust it (or not?)

The original version of this article (in French) was published in the quarterly newsletter no. 20 (March 2021) of the Values and Policies of Personal Information (VP-IP) Chair.

On 25 November 2020, the European Commission published its proposal for the European data governance regulation, the Data Governance Act (DGA) which aims to “unlock the economic and societal potential of data and technologies like artificial intelligence “. The proposed measures seek to facilitate access to and use of an ever-increasing volume of data. As such, the text seeks to contribute to the movement of data between member states of the European Union (as well as with States located outside the EU) by promoting the development of “trustworthy” systems for sharing data within and across sectors.

Part of a European strategy for data

This proposal is the first of a set of measures announced as part of the European strategy for data presented by the European Commission in February 2020. It is intended to dovetail with two other proposed regulations dated on 15 December 2020: the Digital Services Act (which aims to regulate the provision of online services, while maintaining the principle of the prohibition of a surveillance obligation) and the Digital Market Act (which organizes the fight against unfair practices by big platforms against companies who offer services through their platforms). A legislative proposal for the European Health Data Space is expected for the end of 2021 and possibly a “data law.”

The European Commission also plans to create nine shared European data spaces in strategic economic sectors and public interest areas, from the manufacturing industry to energy, or mobility, health, financial data and green deal data. The first challenge to overcome in this new data ecosystem will be to transcend national self-interests and those of the market.  

The Data Governance Act proposal does not therefore regulate online services, content or market access conditions: it organizes “data governance,” meaning the conditions for sharing data, with the market implicitly presumed to be the paradigm for sharing. This is shown in particular by an analysis carried out through the lens of trust (which could be confirmed in many other ways).

The central role of trust

Trust plays a central and strategic role in all of this legislation since the DGA “aims to foster the availability of data for use, by increasing trust in data intermediaries and by strengthening data-sharing mechanisms across the EU.” “Increasing trust”, “building trust”, ensuring a “higher level of trust”, “creating trust”, “taking advantage of a trustworthy environment”, “bringing trust” – these expressions appearing throughout the text point to its fundamental aim.

However, despite the fact that the proposal takes great care to define the essential terms on which it is based (“data“, “reuse”, “non-personal data”, “data holder”, “data user”, “data altruism” etc.), the term “trust,” along with the conditions for ensuring it, are exempt from such semantic clarification – even though “trust” is mentioned some fifteen times.

As in the past with the concept of dignity, which was part of the sweeping declarations of rights and freedoms in the aftermath of the Second World War but was nevertheless undefined –  despite the fact that it is the cornerstone of all bioethical texts, the concept of trust is never made explicit. Lawmakers, and those to whom the obligations established by the legal texts are addressed, are expected to know enough about what dignity and trust are to implicitly share the same understanding. As with the notion of time for Saint Augustine, everyone is supposed to understand what it is, even though they are unable to explain it to someone else.

While some see this as allowing for a certain degree of “flexibility” to adapt the concept of trust to a wide range of situations and a changing society, like the notion of privacy, others see this vagueness – whether intentional or not – at best, as a lack of necessary precision, and at worst, as an undeclared intention.

The implicit understanding of trust

In absolute terms, it is not very difficult to understand the concept of trust underlying the DGA (like in the Digital Services Act in which the European Commission proposes, among other things, a new mysterious category of “trusted flaggers“). To make it explicit, the main objectives of the text must simply be examined more closely.

The DGA represents an essential step for open data. The aim is clearly stated: to set out the conditions for the development of the digital economy by creating a single data market. The goal therefore focuses on introducing a fifth freedom: the free movement of data, after the free movement of goods, services, capital and people.  

While the GDPR created a framework for personal data protection, the DGA proposal intends to facilitate its exchange, in compliance with all the rules set out by the GDPR (in particular data subjects’ rights and consent when appropriate).

The scope of the proposal is broad.

The term data is used to refer to both personal data and non-personal data, whether generated by public bodies, companies or citizens. As a result, interaction with the personal data legislation is particularly significant. Moreover, the DGA proposal is guided by principles for data management and re-use that were developed for research data. The “FAIR” principles for data stipulate that this data must be easy to find, accessible, interoperable and re-usable, while providing for exceptions that are not listed and unspecified at this time.

To ensure trust in the sharing of this data, the category of “data intermediary” is created, which is the precise focus of all the political and legal discourse on trust. In the new “data spaces” which will be created (meaning beyond those designated by the European Commission), data sharing service providers will play a strategic role, since they are the ones who will ensure interconnections between data holders/producers and data users.

The “trust” which the text seeks to increase works on three levels:

  1. Trust among data producers (companies, public bodies data subjects) to share their data
  2.  Trust among data users regarding the quality of this data
  3. Trust among trustworthy intermediaries in the various data spaces

Data intermediaries

This latter group emerges as organizers for data exchange between companies (B2B) or between individuals and companies (C2B). They are the facilitators of the single data market. Without them, it is not possible to create it from a technical viewpoint or make it work. This intermediary position allows them to have access to the data they make available; it must be ensured that they are impartial.

The DGA proposal differentiates between two types of intermediaries: “data sharing service providers,” meaning those who work “against remuneration in any form”  with regard to both personal and non-personal data (Chapter III) and “data altruism organisations” who act “without seeking a reward…for purposes of general interest such as scientific research or improving public services” (Chapter VI).

For the first category, the traditional principle of neutrality is applied.

To ensure this neutrality, which “is a key element to bring trust, it is therefore necessary that data sharing service providers act only as intermediaries in the transactions, and do not use the data exchanged for any other purpose”. This is why data sharing services must be set up as legal entities that are separate from other activities carried out by the service provider in order to avoid conflicts of interest. In the division of digital labor, intermediation becomes a specialization in its own right. To create a single market, we fragment the technical bodies that make it possible, and establish a legal framework for their activities.

In this light, the real meaning of “trust” is “security” – security for data storage and transmission, nothing more, nothing less. Personal data security is ensured by the GDPR; the security of the market here relates to that of the intermediaries (meaning their trustworthiness, which must be legally guaranteed) and the transactions they oversee, which embody the effective functioning of the market.

From the perspective of a philosophical theory of trust, all of the provisions outlined in the DGA are therefore meant to act on the motivation of the various stakeholders, so that they feel a high enough level of trust to share data. The hope is that a secure legal and technical environment will allow them to transition from simply trusting in an abstract way to having trust in data sharing in a concrete, unequivocal way.

It should be noted, however, that when there is a conflict of values between economic or entrepreneurial freedom and the obligations intended to create conditions of trust, the market wins. 

In the impact assessment carried out for the DA proposal, the Commission declared that it would choose neither a high-intensity regulatory intervention option (compulsory certification for sharing services or compulsory authorization for altruism organizations), nor a low-intensity regulatory intervention option (optional labeling for sharing services or voluntary certification for altruism organizations). It opted instead for a solution it describes as “alternative” but which is in reality very low-intensity (lower even, for example, than optional labeling in terms of guarantees of trust). In the end, a notification obligation with ex post monitoring of compliance for sharing services was chosen, along with the simple possibility of registering as an “organisation engaging in data altruism.”

It is rather surprising that the strategic option selected includes so few safeguards to ensure the security and trust championed so frequently by the European Commission champion in its official communication.

An intention based on European “values”

Margrethe Vestager, Executive Vice President of the European Commission strongly affirmed this: “We want to give business and citizens the tools to stay in control of data. And to build trust that data is handled in line with European values and fundamental rights.”

But in reality, the text’s entire reasoning shows that the values underlying the DGA are ultimately those of the market – a market that admittedly respects fundamental European values, but that must entirely shape the European data governance model. This offers a position to take on the data processing business model used by the major tech platforms. These platforms, whether developed in the Silicon Valley ecosystem or another part of the world with a desire to dominate, have continued to gain disproportionate power in light of their business model. Their modus operandi is inherently based on the continuous extraction and complete control of staggering quantities of data.

The text is thus based on a set of implicit reductions that are presented as indisputable policy choices. The guiding principle, trust, is equated with security, meaning security of transactions. Likewise, the European values as upheld in Article 2 of the Treaty on European Union, which do not mention the market, are implicitly related to those that make the market work. Lastly, governance, a term that has a strong democratic basis in principle, which gives the DGA its title, is equated only with the principles of fair market-based sharing, with the purported aim, among other things, to feed the insatiable appetite of “artificial intelligence”.

As for “data altruism,” it is addressed in terms of savings in transaction costs (in this case, costs related to obtaining consent), and the fact that altruism can be carried out “without asking for remuneration” does not change the market paradigm: a market exchange is a market exchange, even when it’s free.

By choosing a particular model of governance implicitly presented as self-evident, the Commission  fails to recognize other possible models that could be adopted to oversee the movement of data.  Just a few examples that could be explored and which highlight the many overlooked aspects of the text, are:

  1.  The creation of a public European public data service
  2. Interconnecting the public services of each European state (based on the eIDAS or Schengen Information System (SIS) model; see also France’s public data service, which presently applies to data created as part of public services by public bodies)
  3. An alternative to a public service: public officials, like notaries or bailiffs, acting under powers delegated by a level of public authority
  4. A market-based alternative: pooling of private and/or public data, initiated and built by private companies.

What kind of data governance for what kind of society?

This text, however, highlights an interesting concept in the age of the “reign of data”: sharing. While data is trivially understood as being the black gold of the 21st century, the comparison overlooks an unprecedented and essential aspect: unlike water, oil or rare metals, which are finite resources, data is an infinite resource, constantly being created and ever-expanding.

How should data be pooled in order to be shared?

Should data from the public sector be made available in order to transfer its value creation to the private sector? Or should public and private data be pooled to move toward a new sharing equation? Will we see the emergence of hybrid systems of values that are evenly distributed or a pooling of values by individuals and companies? Will we see the appearance of a “private data commons”? And what control mechanisms will it include?

Will individuals or companies be motivated to share their data? This would call for quite a radical change in economic culture.

The stakes clearly transcend the simple technical and legal questions of data governance. Since the conditions are those of an infinite production of data, these questions make us rethink the traditional economic model.

It is truly a new model of society that must be discussed. Sharing and trust are good candidates for rethinking the society to come, as long as they are not reduced solely to a market rationale.

The text, in its current form, certainly offers points to consider, taking into account our changing societies and digital practices. The terms, however, while attesting to worthwhile efforts for categorization adapted to these practices, require further attention and conceptual and operational precision.   

While there is undoubtedly a risk of systematic commodification of data, including personal data, despite the manifest wish for sharing, it must also be recognized that the text includes possible advances.  The terms of this collaborative writing  are up to us – provided, of course, that all of the stakeholders are consulted, including citizens, subjects and producers of this data.


Claire Levallois-Barth, lecturer in Law at Télécom Paris, coordinator of the VP-IP chair, co-founder of the VP-IP chair.

Mark Hunyadi, professor of moral and political philosophy at the Catholic University of Louvain (Belgium), member of the VP-IP chair.

Ivan Meseguer, European Affairs, Institut Mines-Télécom, co-founder of the VP-IP chair.

bio-inspiration

What is bio-inspiration?

The idea of using nature as inspiration to create different types of technology has always existed, but it has been formalized through a more systematic approach since the 1990s. Frédéric Boyer, a researcher at IMT Atlantique, explains how bio-inspiration can be a source of new ideas for developing technologies and concepts, especially for robotics.

How long has bio-inspiration been around?

Frédéric Boyer: There have always been exchanges between nature and fundamental and engineering sciences. For instance, Alessandro Volta used electric fish such as electric rays as inspiration to develop the first batteries. But it’s an approach that has become more systematic and intentional since the 1990s.

How does bio-inspiration contribute to the development of new technologies?

FB: In the field of robotics, the dream has always been to make an autonomous robot, that can interact appropriately with an unfamiliar environment, without putting itself or those around it in danger. In robotics we don’t really talk about intelligence – what we’re interested in is autonomy, and that’s still a long way off.  

There’s a real paradigm shift underway. For a long time, intelligence was considered to be  computing power. Using measurements made by their various sensors, robots had to reconstruct their complex environment in a symbolic way and make decisions based on this information. Through this approach, we built machines that were extremely complex but with little autonomy or ability to adapt to different environments. Through the bio-inspiration movement, in particular, intelligence has also come to be defined in terms of the autonomy it brings to a system.  

What is the principle behind a bio-inspired robot?

FB: Bio-inspired robots are not based on the perception and complex representation of their environment. They are simply sensors and local loops that enable them to move in different environments. This type of intelligence comes from observing animals’ bodies: it’s what we call embodied intelligence. This intelligence, encoded in the body and morphology of living organisms has been developed over the course of evolution: an animal with a very simple nervous system can interact very effectively with its environment. We practice embodied intelligence every day: with very low  levels of cognition we solve complex problems related to the autonomy of our body.

To illustrate the difference between the paradigms we can take the example of a robot that creeps along like a snake. There are two approaches for piloting this system. The first is to place a supercomputer inside the robot, that will send a signal to each of the vertebrae and motors to drive the joints. With the second approach, there is no centralized computer. The “head” sends an  impulsion to the first vertebrae which spreads to the next one, followed by the one after that and is automatically synchronized through feedback phenomena between the vertebrae and with the environment, through sensors.

Read more on l’IMTech: Intelligence incarnated: a bio-inspired approach in the field of robotics

What does a bio-inspired approach to developing new technology involve?

FB: It’s an approach made up of three stages. First, you have to closely observe how living beings function and choose a good candidate solution for a given problem. Then, you have to extract relevant phenomena in the functioning of the original natural system and understand them using the laws of physics and mathematical models. This is the most complex stage because we have to do a lot of sorting. Nature is extremely redundant, which allows it to adapt to changes in the environment, but in our case, only certain phenomena are sought. So, we have to sort through the information and order it using mathematical models to understand how animals solve problems. The last stage is using these models to develop new technologies. That’s also why we talk about bio-inspiration and not bio-mimicry: the goal is not to reproduce living systems, but to use them as inspiration based on functional models.

What are some examples of bio-inspired technologies?

FB : We’re working on the electrical sense, inspired by fish that are referred to as electric fish: these animals’ electro sensitive skin helps them perceive their environment (objects, distance, other fish etc.) and navigate over long distances using maps that are still little understood. We are able to imitate this sixth sense using electrodes placed on the surface of our robots that record “echoes” from a field, emitted and reflected by the environment.

Beyond that, one of the best-known examples are the crawling robots developed by the Massachusetts Institute of Technology (MIT). These robots are inspired by geckos. They can stick to surfaces through a multitude of microscopic adhesive forces, like those generated by the tiny hairs on geckos’ feet. The bio-inspired approach can be extended to these nanometer scales!

And insects’ vision and the way they flap their wings to fly, or how snakes creep along are other examples of sources of inspiration for developing robotic technologies.  

Are there other kinds of intelligence that are inspired by animals?

FB : Collective intelligence is a good example. By studying ants or bees, it is possible to make swarms of drones that can perform complex cognitive tasks without a high level of on-board intelligence. For animals that are organized in swarms, each unit has very little intelligence, but the sum of their interactions, with one another and with the environment, results in a collective intelligence. It’s also a source of study for the development of new robotic technologies.

What fields does bio-inspiration apply to?

FB: In addition to robotics, bio-inspiration provides a source of innovation for a wide range of fields. Whether in applied sciences, like aeronautics and architecture, or areas of basic research like mathematics, physics and computational sciences.

What does the future of bio-inspiration hold?

FB : We’re going to have to reinvent and produce new technologies that are not harmful to the environment. There is a philosophical revolution and paradigm shift to be achieved in terms of the relationship between man and other living things. It would be a mistake to believe that we can replace living beings with robots.

Bio-inspiration teaches us a form of wisdom and humility, because we still have a lot of work ahead of us before we can build a drone that can fly like an insect in an autonomous way, in terms of energy and decision-making. Nature is a never-ending source of inspiration, and of wonder.

By Antonin Counillon

Miguel Lopez Ferber

IMT Mines Alès | Environmental footprint, Water footprint, Natural resources, LCA

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Frédérick Benaben

IMT Mines Albi | Risk and crisis management, Industrial Engineering, Supply chain

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Mélissa Boudes

Institut Mines-Télécom Business School | Social and solidarity economy, Digital transition, Work organisation

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Nicolas Jullien

IMT Atlantique | Digital economy, Digital commons, Digital transformation

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Caroline Rizza

Télécom Paris | Crisis management, Social media, Digital Ethics

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Grazia Cecere

Institut Mines-Télécom Business School | Digital economy, Machine learning, Ethics of algorithms

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