Journal
SYNTHETIC METALS
Volume 203, Issue -, Pages 215-220Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2015.02.007
Keywords
Graphene; Electrical properties; Self-supporting transfer; Spectroscopy
Funding
- Natural Science Basic Research Plan in Shaanxi Province of China [2012JM8009]
- Doctoral Program Foundation of Institutions of Higher Education of China [20110203120014]
- Fundamental Research Funds for the Central Universities [K50510250005, JB141108]
- Applied Materials Innovation Fund of Xi'an [XA-AM-201002]
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We present a systemic investigation on electrical and optical properties of layer-stacked graphene transparent electrodes using a self-supporting method (SSM). As is expected, SSM-stacked films appear smoother surface morphologies (roughness of 4.60 nm for 5-layer sample) than the traditional layer stacking method. The non-contact electrical measurement demonstrates that sheet resistances of layerstacked samples obviously diminish after the layer stacking process, which is only 20.16 Omega/square for the 5-layer-SSM-stacked sample. All the SSM samples show high white light transparency (-88% for 5-layer sample). The ultraviolet-visible-infrared absorption spectra indicate that there are two main absorption peaks, which are related to the inter-band emission with resonant exciton effect and intra-band absorption decoupled stacked multilayer graphene, respectively. And after nitric acid doping, these peaks show obvious red-shifts because of p-type doping and coupling effects arising from the layer-stacking process. All these results reveal that there are both strong coupled and decoupled multilayer graphene in the SSM-stacked samples; and the coupling effect can be enhanced after the acid treatment. (C) 2015 Elsevier B.V. All rights reserved.
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