Graphene
Graphene is a two-dimensional form of carbon in which atoms occupy a single, honeycomb-like layer. Its unusual electronic structure gives it high carrier mobility and tunable electrical behavior, while its thinness, strength, flexibility, transparency, and thermal conductivity have made it important in materials research. Potential applications include sensors, electronics, energy technologies, composites, and biomedical devices, although large-scale production and the absence of a natural band gap complicate some uses.
Structure and properties
Graphene is an allotrope of carbon consisting of a single atomic layer arranged in a hexagonal lattice. It can be regarded as the basic sheet from which graphite is built, although the electronic behavior of an isolated layer differs from that of stacked graphite. Graphene is extremely thin, light, flexible, and nearly transparent. Its carbon bonds give it high mechanical strength, and its electronic structure allows charge carriers to move with high mobility. It also conducts heat efficiently. The properties of a sample depend on factors such as its layer count, lattice defects, and interactions with a substrate, so measured behavior can differ from that of an ideal isolated sheet.
Discovery and study
Researchers had studied graphitic layers before the modern graphene field, but the material became a major experimental subject after Andre Geim and Konstantin Novoselov isolated and characterized single-layer flakes at the University of Manchester in 2004. Their mechanical-exfoliation experiments used adhesive tape to separate layers from graphite. The work showed that a stable, measurable one-atom-thick carbon sheet could be studied directly. Geim and Novoselov received the 2010 Nobel Prize in Physics for experiments regarding graphene, reflecting the material's importance to condensed-matter physics and materials science.
Electronic behavior
In graphene, electrons behave according to an unusual band structure that permits rapid charge transport near the charge-neutrality point. NIST describes high carrier mobility and continuous tuning between electron and hole conduction as important features. This behavior makes graphene attractive for high-frequency electronics, sensors, transparent conductors, and other devices. A central limitation is that pristine graphene has no conventional energy band gap. Because digital logic commonly uses a band gap to distinguish strongly between on and off states, graphene transistors can have a low on/off current ratio. Researchers investigate patterning, layered structures, gating, and other approaches to control this trade-off, but opening a gap can also reduce mobility or device quality.
Applications and research challenges
Graphene and graphene-based materials are investigated for electronic and optical components, chemical and biological sensors, thermal management, coatings, composites, energy storage, and biomedical applications. European research programmes also examine uses in vehicle structures, batteries, image sensors, and electromagnetic shielding. These are areas of research and development rather than a guarantee that every proposed application will reach broad commercial deployment. A recurring challenge is scale-up: practical applications depend on producing films or powders at industrial scale with suitable morphology and quality. Different production routes involve trade-offs in area, uniformity, throughput, and material properties, so researchers match the process to the intended use. Commercial development has been slower than early expectations, and manufacturability remains an active research issue.
Key facts
- Composition
- A single atomic layer of carbon atoms arranged in a hexagonal lattice.
- Relation to graphite
- Graphite consists of many carbon layers; graphene refers to an individual layer.
- Notable properties
- High carrier mobility, electrical and thermal conductivity, mechanical strength, flexibility, and near-transparency.
- Electronic limitation
- Pristine graphene lacks a conventional band gap, complicating some digital-logic transistor designs.
- Research areas
- Electronics, sensors, composites, energy technologies, thermal management, optics, and biomedicine.
Timeline
2004
Andre Geim and Konstantin Novoselov isolate and study single-layer graphene at the University of Manchester using mechanical exfoliation.
2010
Geim and Novoselov receive the Nobel Prize in Physics for experiments concerning graphene.
2013
The Graphene Flagship begins coordinating European academic and industrial research on graphene and layered materials.
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References
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Encyclopaedia Britannica · other · reliability: high · retrieved 18 October 2026
Supports: Reference overview of graphene's structure, electronic behavior, history, and relation to other carbon materials.
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Supports: Official public explanation of graphene's atomic lattice, physical properties, exfoliation from graphite, and the 2010 prize.
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National Institute of Standards and Technology · other · reliability: high · retrieved 18 October 2026
Supports: Government research overview of graphene's electronic structure, carrier mobility, tunability, and measurement.
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The University of Manchester · other · reliability: high · retrieved 18 October 2026
Supports: Institutional account of the 2004 isolation work, mechanical exfoliation, properties, and Nobel recognition.
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Supports: Peer-reviewed review discussing graphene's electronic, thermal, mechanical, optical, and application-related properties.
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Supports: Peer-reviewed review of graphene and derivative materials in biomedical research.
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Supports: NIST research overview describing how defects can alter graphene's material properties and carrier mobility.
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Proceedings of the National Academy of Sciences · other · reliability: high · retrieved 18 October 2026
Supports: Research article discussing graphene's high mobility, lack of an energy gap, and implications for field-effect transistor design.
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Supports: Peer-reviewed review of industrial-scale production methods for graphene and related materials, including quality and scale-up challenges.
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Supports: Government science explanation of graphene's rapid electron transport and the challenge of controlling current without a band gap.
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Graphene Flagship · other · reliability: unverified · retrieved 18 October 2026
Supports: Research programme overview of proposed graphene applications in vehicle structures, batteries, sensors, and shielding.
References are suggested by the research engine and may be incomplete. Unverified URLs are omitted rather than guessed.
Article history
- Version 118 October 2026 · EditorCreated by Zapia