Thursday, September 11, 2014

Self-assembly of a thin highly reduced graphene oxide film and its high electrocatalytic activity

A thin highly reduced graphene oxide (rGO) film was self-assembled at the dimethyl formamide (DMF)–air interface through evaporation-induced water-assisted thin film formation at the pentane–DMF interface, followed by complete evaporation of pentane. The thin film was transferred onto various solid substrates for film characterization and electrochemical sensing. UV-visible spectrometry, scanning electron microscopy (SEM), atomic force microscopy (AFM) and electrochemistry techniques were used to characterize the film. An rGO film showing 82.8% of the transmittance at 550 nm corresponds to a few layers of rGO nanosheets. The rGO nanosheets cross-stack with each other, lying approximately in the plane of the film. An rGO film collected on a glassy carbon (GC) electrode exhibited improved electrical conductivity compared to GC, with the electrode charge-transfer resistance (R ct ) reduced from 31 Ω to 22 Ω . The as-formed rGO/GC electrode was mechanically very...

Yan-Feng Bai, Yong-Fang Zhang, An-Wei Zhou, Hai-Wai Li, Yu Zhang, John H T Luong and Hui-Fang Cui

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