We describe monocrystalline graphitic films, which are a few atoms thick but are nonetheless stable under ambient conditions, metallic, and of remarkably high quality. The films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands, and they exhibit a strong ambipolar electric field effect such that electrons and holes in concentrations up to 10(13) per square centimeter and with room-temperature mobilities of approximately 10,000 square centimeters per volt-second can be induced by applying gate voltage.
we have been able to prepare graphitic sheets of thicknesses down to a few atomic layers, including single layer graphene, and succeeded in making devices from them
AFM/SEM imaging and device fabrication are paired with transport measurements across thin films
The films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands
resistivity, Hall, temperature-dependence, and band-overlap estimates converge on the semimetal model
electrons and holes in concentrations up to 1013cm-2 and with room-temperature mobilities ≈10,000 cm2/Vs can be induced by applying gate voltage
field-effect and magnetoresistance mobility estimates agree across reported devices
electronic transport in FLG was strictly 2D
angular Shubnikov-de Haas dependence and BF proportional to Vg directly test dimensionality
2D electronic transport is ballistic at submicron distances
inferred from mobility-derived mean free path rather than a direct ballistic-transport experiment
Derived from the full evaluation — not a separate score.
Strengths
The article reports preparation of graphitic sheets down to single-layer graphene and fabrication of devices from them. This directly addresses the prior assumption that planar graphene would not exist freely under ambient conditions.
↳ Introduction and Figure 1
Field-effect conductivity, Hall coefficient reversal, temperature dependence, and Shubnikov-de Haas oscillations all support the two-dimensional semimetal interpretation. Figure 3 adds angular and frequency evidence for strictly two-dimensional carrier behavior.
↳ Figures 2–3
The article explicitly notes that graphene transistors have a modest on-off resistance ratio and links that limitation to the absence of a band gap exceeding kBT. It also identifies unresolved carrier-mass behavior rather than forcing the data into the expected theory.
↳ Main text, final results and transistor paragraphs
Limitations
The article repeatedly sends fabrication details and detailed Shubnikov-de Haas analysis to supporting online material [15]. That is typical for a short Science report, but it limits independent assessment of the complete procedure and derivations from the supplied text alone.
↳ Main text, methods paragraph; Reference [15]
The demonstrated preparation method is repeated mechanical peeling from highly oriented pyrolytic graphite. It is effective for discovery-scale devices but does not establish scalable wafer-level production or industrial integration.
↳ Main text, fabrication paragraph
The article reports an on-off resistance ratio below approximately 30 at 300 K and attributes this to thermally excited carriers in a material without a sufficient band gap. This limits immediate transistor competitiveness despite the strong field effect.
↳ Main text, final transistor paragraph
The article earns a high Quality score because its headline claims are directly linked to imaging, device fabrication, and convergent transport measurements in Figures 1–3. The Methodological Rigour score reflects strong experimental fit and cross-checking through field-effect, Hall, temperature-dependent, and Shubnikov-de Haas analyses, tempered by reliance on supporting material [15] for important details. Impact Potential is high but below the Quality score because the work is a discovery and proof-of-concept device demonstration, not a scalable technology package. The translation score is held down by mechanical exfoliation and the acknowledged on-off ratio below approximately 30 at room temperature.
Nabu’s assessment, alongside the field’s view.
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Exemplary4.6
Confidence highThe score reflects a field-opening contribution: the article reports preparation of few-layer and single-layer graphene, fabrication of devices, and electronic characterization of a stable two-dimensional carbon material. Its claims are proportionate to the figures and measurements, with minor limits from the short-letter format and supporting material dependence.
including single layer graphene, and succeeded in making devices from them
The score reflects strong design-execution fit: Hall-bar devices on oxidized Si enabled field-effect, Hall, temperature-dependent, and Shubnikov-de Haas measurements across more than 60 thin devices. Methodological Rigour is not capped, but some procedural and analytical detail is deferred to supporting material [15].
We have studied more than 60 devices with d <10 nm.
The article presents a coherent sequence from motivation and fabrication to field-effect data, quantum oscillations, carrier characterization, and device implications. It also flags key qualifications, including modest on-off ratio and the unresolved free-electron-model discrepancy.
remains to be understood
The score reflects strong engagement with prior work on graphite, nanotubes, nanographene, and the presumed instability of planar graphene. The article also contextualizes limitations, including environmental doping, the absence of a sufficient band gap, and alternative explanations for finite apparent band overlap.
Planar graphene itself has so far been presumed not to exist in the free state
Caveats4 of 4 checks
The article is internally coherent across its abstract, main text, figures, and quantitative claims. Carrier-density, mobility, band-overlap, Hall-effect, and Shubnikov-de Haas descriptions align with the reported figures and stated model.
No ethics approval or preregistration is applicable for this laboratory physics experiment, and no image-integrity concern is evident. Research conduct is noted because important fabrication and detailed analytical procedures are deferred to supporting online material [15], which is cited but not available in the supplied article.
Flags: 0 declared / 5 total
All 16 cited references resolved to real publications via PubMed, Crossref, or OpenAlex.
References not verified automatically are resolved manually within 24 hours.
No retraction or expression of concern found in Crossref (includes Retraction Watch).
Sources: Crossref (incl. Retraction Watch) ✓
Where this paper’s evidence sits on the path from initial observation to real-world use.
The score reflects proof-of-concept translation: the article demonstrates field-effect devices and room-temperature operation, but not scalable manufacturing or deployment-ready switching. Mechanical exfoliation and the on-off ratio below approximately 30 constrain near-term application.
Graphene transistors show a rather modest on-off resistance ratio
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