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Fabrication of ultrathin, free-standing, transparent and conductive graphene/multiwalled carbon nanotube film with superior optoelectronic properties

Publication date: 30 November 2015
Source:Thin Solid Films, Volume 595, Part A
Author(s): Shriniwas Yadav, Vanish Kumar, Shweta Arora, Sukhbir Singh, Deepika Bhatnagar, Inderpreet Kaur
Here we report a wet chemical technique to obtain transparent electrodes for optoelectronic devices. This technique is simple, facile, low cost and an effective way to prepare ultrathin free standing hybrid graphene/multiwalled carbon nanotubes (MWCNT) films. The graphene/MWCNT films, up to 36mm in diameter, with controllable thickness and root mean square surface roughness of the order of 12.6nm are prepared. The ratio of graphene/MWCNT is optimized to make them free standing and easily transferrable on various substrates. The ratio of direct current conductivity to the optical conductivity (σdc/σopt) which is considered as figure of merit for transparent conductors, is enhanced to 10.27 for graphene/MWCNT hybrid films. The prepared films showed outstanding transmittance up to 87.3±1% at 550nm, 87.9±1% at 800nm and sheet resistance of 136±22.4Ω/sq.


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