Simple Approach for High-Contrast Optical Imaging and Characterization of Graphene-Based Sheets

By I. Jung, M. Pelton, R. Piner, Dmitriy A. Dikin, S. Stankovich, Supinda Watcharotone, M. Hausner, Rodney S. Ruoff. 2007

341 citations recorded by the source corpus.

A simple optical method is presented for identifying and measuring the effective optical properties of nanometer-thick, graphene-based materials, based on the use of substrates consisting of a thin dielectric layer on silicon. High contrast between the graphene-based materials and the substrate is obtained by choosing appropriate optical properties and thickness of the dielectric layer. The effective refractive index and optical absorption coefficient of graphene oxide, thermally reduced graphene oxide, and graphene are obtained by comparing the predicted and measured contrasts.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/b5ed402e6b2c2a2c1665f696e69a1b1874c562a0

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Citations in the corpus

Dirac electronic states in graphene systems: optical spectroscopy studies (2010, background): “As more recently revealed in details [37, 38, 39, 40, 41], the choice of the appropriate thickness of the SiO2 layer plays the essential role in the visualization of the graphene layers.”
Anomalies in thickness measurements of graphene and few layer graphite crystals by tapping mode atomic force microscopy (2008, methodology): “However, AFM is still being used frequently to determine, or confirm the thickness of FLG layers obtained by other techniques [23,25].”
Production, properties and potential of graphene (2010, background): “[11, 13] Furthermore, the optical contrast of graphene or few-graphene layers can be noticeably improved by suitably adjusting the monochromatic light wavelength at the maximal contrast.[11, 14] The optimization of the optical contrast of graphene with respect to the background colour of the substra”
Mechanics of freely‐suspended ultrathin layered materials (2014, background): “. There are several works that provide protocols to optimize the optical contrast and to optically determine the number of layers of many 2D materials: 4 graphene [18, 19, 20, 21, 22], graphene oxide [23], MoS 2 [24, 25, 26], NbSe 2 [24, 27], WSe 2 [26, 27], TaS 2 [26], TaSe 2 [28], mica [29, 30], e”
Chemical analysis of graphene oxide films after heat and chemical treatments by X-ray photoelectron and Micro-Raman spectroscopy (2009, background): “[6] Jung I, Pelton M, Piner R, Dikin DA, Stankovich S, Watcharotone S, et al.”
Synthesis of high-quality graphene with a pre-determined number of layers (2009, background): “[23] Jung I, Pelton M, Piner R, Dikin DA, Stankovich S, Watcharotone S, et al.”