Journal ArticleDOI
Optical Spectroscopy Investigation of the Structural and Electrical Evolution of Controllably Oxidized Graphene by a Solution Method
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TLDR
In this paper, a precisely controlled chemical modification of exfoliated graphene on a substrate was achieved by solution-phase oxidation, which exhibited an energy band gap of 2 eV.Abstract:
A precisely controlled chemical modification of exfoliated graphene on a substrate was achieved by solution-phase oxidation. The structural and electrical evolution of graphene induced by oxygen-related defects was investigated using micro-Raman and photoluminescence spectroscopy. The sp2-hybrid carbon network in monolayer graphene was found to gradually decrease with increasing degree of oxidation. The size of the graphene quantum dots was finally reduced to about 1 nm, which exhibited an energy band gap of 2 eV. The double-layer graphene showed a symmetry breaking induced by the defects. The process of solution modification may provide a facile method to tailor the electrical properties of graphene on a chip for constructing carbon-based nanoelectronics.read more
Citations
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The chemical and structural analysis of graphene oxide with different degrees of oxidation
TL;DR: In this article, the formation of different types of oxygen containing functional groups in GO and their influences on its structure were analyzed using X-ray diffraction (XRD), Fourier transform infra-red spectra, x-ray photoelectron spectra (XPS), zeta potential analysis and Raman spectroscopy.
Journal ArticleDOI
Selective ionic transport through tunable subnanometer pores in single-layer graphene membranes.
Sean C. O'Hern,Michael S. H. Boutilier,Juan Carlos Idrobo,Yi Song,Jing Kong,Tahar Laoui,Muataz Ali Atieh,Rohit Karnik +7 more
TL;DR: The ability to tune the selectivity of graphene through controlled generation of subnanometer pores addresses a significant challenge in the development of advanced nanoporous graphene membranes for nanofiltration, desalination, gas separation, and other applications.
Journal ArticleDOI
Tuning the Electrical and Optical Properties of Graphene by Ozone Treatment for Patterning Monolithic Transparent Electrodes
TL;DR: A well-defined graphene pattern is demonstrated by using ozone photolithography, in which the ozone-treated graphene electrodes are monolithic but separated by insulating GO regions, indicating the promising use of ozone treatment to achieve high-performance graphene-based optoelectronic devices.
Journal ArticleDOI
Principles Governing Control of Aggregation and Dispersion of Graphene and Graphene Oxide in Polymer Melts
TL;DR: By combining coarse-grained molecular dynamics and newly developed accurate models of GO, the driving forces that lead to the various morphologies are resolved and computational methods to design directed synthesis routes for diverse self-assemblies and applications are provided.
Journal ArticleDOI
Disorder imposed limits of mono- and bilayer graphene electronic modification using covalent chemistry.
Chih-Jen Shih,Qing Hua Wang,Zhong Jin,Geraldine L.C. Paulus,Daniel Blankschtein,Pablo Jarillo-Herrero,Michael S. Strano +6 more
TL;DR: An electrochemical approach involving phenyl-diazonium salts is used to systematically probe electronic modification in MLG and BLG with increasing functionalization for the first time, obtaining the highest conversion values to date.
References
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Journal ArticleDOI
Observation of Distinct Electron-Phonon Couplings in Gated Bilayer Graphene
TL;DR: A Raman study of a back gated bilayer graphene sample is presented, showing changes in the Fermi level induced by charge transfer splits the Raman G band, hardening its higher component and softening the lower one.
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Controlled Hydrogenation of Graphene Sheets and Nanoribbons
Manu Jaiswal,Candy Haley Yi Xuan Lim,Qiaoliang Bao,Chee Tat Toh,Kian Ping Loh,Barbaros Özyilmaz +5 more
TL;DR: A comparison of Raman spectrum and conductivity data of partially hydrogenated monolayer and bilayer graphene suggests that the latter is also quite susceptible to adsorption of hydrogen atoms, despite a stiffer lattice structure.
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Electronic Structures and Structural Evolution of Hydrogenated Graphene Probed by Raman Spectroscopy
Zhiqiang Luo,Ting Yu,Zhenhua Ni,San Hua Lim,Hailong Hu,Jingzhi Shang,Lei Liu,Zexiang Shen,Jianyi Lin +8 more
TL;DR: In this article, the electronic structures and structural evolution of hydrogenated graphene are investigated by Raman spectroscopy with multiple excitations, and the excitation energy dependent saturation effect on the ratio of integrated intensities of D and G modes (ID/IG) is revealed and interpreted by a D band active model with D band Raman relaxation length and photoexcited electron/hole wavelength as critical length scales.
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Optical phonon mixing in bilayer graphene with a broken inversion symmetry
TL;DR: In this paper, the authors used Raman spectroscopy to probe the breakdown of parity conservation in a direct and quantitative manner via a phonon mixing phenomenon and demonstrated a manifestation of broken inversion symmetry in graphene layers.
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Observation of Raman G -band splitting in top-doped few-layer graphene
Matteo Bruna,Stefano Borini +1 more
TL;DR: In this paper, an experimental study of Raman scattering in $N$-layer graphene as a function of top layer doping is reported, which is related to distinct electron-phonon interactions, which are affected by symmetry breaking and Fermi-level position.