Band Gap Tuning of Hydrogenated Graphene: H Coverage and Configuration Dependence

Gao, Haili; Wang, Lu; Zhao, Jijun; Ding, Feng; Lü, Jianping

doi:10.1021/jp1094454

Cited by 180 publications

(157 citation statements)

References 47 publications

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“…The obtained level of hydrogenation is in good agreement with experimental results and corresponds with the insulator structure (calculated band gap is 1.7 eV). Because the band gap of hydrogenated 1LG depends on hydrogen coverage, 32 we can engineer the electronic structure of hydrogenated 1LG in a wider range and enhance its applications in electronics (electrical properties of hydrogenated 1LG, Supplementary Figure S11b) and photonics by introducing negative AFM lithography.…”

Section: Electrical Control Of Nanoscale Functionalization I-s Byun Ementioning

confidence: 99%

Electrical control of nanoscale functionalization in graphene by the scanning probe technique

et al. 2014

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Functionalized graphene is a versatile material that has well-known physical and chemical properties depending on functional groups and their coverage. However, selective control of functional groups on the nanoscale is hardly achievable by conventional methods utilizing chemical modifications. We demonstrate electrical control of nanoscale functionalization of graphene with the desired chemical coverage of a selective functional group by atomic force microscopy (AFM) lithography and their full recovery through moderate thermal treatments. Surprisingly, our controlled coverage of functional groups can reach 94.9% for oxygen and 49.0% for hydrogen, respectively, well beyond those achieved by conventional methods. This coverage is almost at the theoretical maximum, which is verified through scanning photoelectron microscope measurements as well as first-principles calculations. We believe that the present method is now ready to realize 'chemical pencil drawing' of atomically defined circuit devices on top of a monolayer of graphene.

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Section: Electrical Control Of Nanoscale Functionalization I-s Byun Ementioning

confidence: 99%

Electrical control of nanoscale functionalization in graphene by the scanning probe technique

et al. 2014

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“…Interestingly, theoretical calculation showed that the bandgap of hydrogenated graphene can be continuously tuned from 0 to 4.66 eV by different H coverage [8] . These results provide a new perspective to the application of graphene-based materials as the acceptor in the polymer solar cells field.…”

Section: Introductionmentioning

confidence: 99%

Selective band gap manipulation of graphene oxide by its reduction with mild reagents

Velasco-Soto

Pérez‐García

Alvarez-Quintana

et al. 2015

Carbon

209

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Selective band gap manipulation of graphene oxide by its reduction with mild reagents, Carbon (2015), doi: http://dx. ABSTRACTGraphene oxide (GO) can be used as an electron acceptor for polymeric solar cells but still band gap matching for electron donor and acceptor demands more study. The generation of the exciton in such materials is intimately related to the optical band gap. However, exciton dissociation is related to transport band gap that controls the device performance, particularly the open circuit voltage and short circuit current. Therefore, the modulation of the optical gap is useful because it results into tuning of the transport gap. The interest of the present work is to study the reduction of graphene oxide (GO) at room temperature, using environmental friendly reagents like glucose, fructose and ascorbic acid for the modulation of a band gap. It has been found that glucose and fructose function effectively only in presence of NH 4 OH. Although ascorbic acid can reduce GO alone, NH 4 OH speeds up the reaction. The optical band gap of GO can be reduced and tuned effectively from 2.7eV to 1.15eV.

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“…1,2 The chemical modification of graphene is fundamental for tailoring its physical and chemical properties. [3][4][5][6][7] In particular, the interaction of water with graphene is receiving much interest. [8][9][10][11][12][13][14][15] Water molecules adsorbed on graphene act as dopants without remarkable changes in electron mobility.…”

Section: Introductionmentioning

confidence: 99%

Water adsorption on graphene/Pt(111) at room temperature: A vibrational investigation

et al. 2011

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Water interaction with quasi-freestanding graphene deposited on Pt(111) has been investigated by using vibrational spectroscopy. Loss measurements show that water molecules dosed at room temperature can dissociate giving rise to C-H bonds. The formation of the C-H bonds strongly attenuates the optical phonons of the graphene sheet. On the other hand, at 100 K water has been found to adsorb only in molecular state. Present findings should be taken into account in engineering graphene-based devices which should work at atmospheric pressure and at room temperature

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Band Gap Tuning of Hydrogenated Graphene: H Coverage and Configuration Dependence

Cited by 180 publications

References 47 publications

Electrical control of nanoscale functionalization in graphene by the scanning probe technique

Electrical control of nanoscale functionalization in graphene by the scanning probe technique

Selective band gap manipulation of graphene oxide by its reduction with mild reagents

Water adsorption on graphene/Pt(111) at room temperature: A vibrational investigation

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