Effects of layer stacking on the combination Raman modes in graphene.
Rahul Rao,Ramakrishna Podila,Ryuichi Tsuchikawa,Jyoti Katoch,Derek Tishler,Apparao M. Rao,Masa Ishigami +6 more
TLDR
In this paper, the authors observed new combination modes in the range from 1650 to 2300 cm−1 in single-SLG, bi-, few-layer and incommensurate bilayer graphene (IBLG) on silicon dioxide substrates.Abstract:
We have observed new combination modes in the range from 1650 to 2300 cm−1 in single-(SLG), bi-, few-layer and incommensurate bilayer graphene (IBLG) on silicon dioxide substrates. A peak at ∼1860 cm−1 (iTALO−) is observed due to a combination of the in-plane transverse acoustic (iTA) and the longitudinal optical (LO) phonons. The intensity of this peak decreases with increasing number of layers and this peak is absent for bulk graphite. The overtone of the out-of-plane transverse optical (oTO) phonon at ∼1750 cm−1, also called the M band, is suppressed for both SLG and IBLG. In addition, two previously unidentified modes at ∼2200 and ∼1880 cm−1 are observed in SLG. The 2220 cm−1 (1880 cm−1) mode is tentatively assigned to the combination mode of in-plane transverse optical (iTO) and TA phonons (oTO+LO phonons) around the K point in the graphene Brillouin zone. Finally, the peak frequency of the 1880 (2220) cm−1 mode is observed to increase (decrease) linearly with increasing graphene layers.read more
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Raman spectroscopy of graphene-based materials and its applications in related devices.
TL;DR: The essential Raman scattering processes of the entire first- and second-order modes in intrinsic graphene are described and the extensive capabilities of Raman spectroscopy for the investigation of the fundamental properties of graphene under external perturbations are described.
Journal ArticleDOI
Hydrothermal synthesis of graphene-TiO 2 nanotube composites with enhanced photocatalytic activity
Sanjaya D. Perera,Ruperto G. Mariano,Khiem Vu,Nijem Nour,Oliver Seitz,Yves J. Chabal,Kenneth J. Balkus +6 more
TL;DR: In this paper, the photocatalytic performance of the reduced graphene oxide (hGO)-TNT composites was evaluated for the photodegradation of malachite green using X-ray diffraction (XRD), Raman, FTIR, and XPS analysis.
Journal ArticleDOI
Graphene-based semiconductor nanostructures
TL;DR: In this paper, the state-of-the-art in the field of semiconducting derivatives of GAs is summarized, including graphane, fluorographene, and diamane.
Journal ArticleDOI
Raman characterization of ABA- and ABC-stacked trilayer graphene
Chunxiao Cong,Ting Yu,Ting Yu,Kentaro Sato,Jingzhi Shang,Riichiro Saito,Gene Dresselhaus,Mildred S. Dresselhaus +7 more
TL;DR: A systematic experimental and theoretical analysis of the Raman modes in bothBernal (ABA stacking order) and rhombohedral trilayer graphene (3LG) shows that the G band, G' (2D) band, and the intermediate-frequency combination modes of 3LGs are sensitive to the stacking order of 3LG.
Journal ArticleDOI
Highly Electroconductive Mesoporous Graphene Nanofibers and Their Capacitance Performance at 4 V
TL;DR: GNFs exhibited good structural stability, high surface area, mesopores in large amount, and electrical conductivity 3 times that of carbon nanotube aggregates, and it, used as an electrode in a 4 V supercapacitor, exhibited high energy density in a wide range of high power density and excellent cycling stability.
References
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