Document Detail


Direct Observation of Spatially Heterogeneous Single Layer Graphene Oxide Reduction Kinetics.
MedLine Citation:
PMID:  24245975     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Graphene oxide (GO) is an important precursor in the production of chemically-derived graphene. During reduction, GO's electrical conductivity and band gap change gradually. Doping and chemical functionalization are also possible, illustrating GO's immense potential in creating functional devices through control of its local hybridization. Here we show that laser-induced photolysis controllably reduces individual single-layer GO sheets. The reaction can be followed in real time through sizable decreases in GO's photoluminescence efficiency along with spectral blueshifts. As-produced reduced graphene oxide (rGO) sheets undergo additional photolysis, characterized by dramatic emission enhancements and spectral redshifts. Both GO's reduction and subsequent conversion to photobrightened rGO are captured through movies of their photoluminescence kinetics. Rate maps illustrate sizable spatial and temporal heterogeneities in sp(2) domain growth and reveal how reduction "flows" across GO and rGO sheets. The observed heterogeneous reduction kinetics provides mechanistic insight into GO's conversion to chemically-derived graphene and highlights opportunities for overcoming its dynamic, chemical disorder.
Authors:
Matthew Paul McDonald; Ahmed Eltom; Felix Vietmeyer; Janak Thapa; Yurii Morozov; Denis Aleksandrovich Sokolov; Jose H Hodak; Kizhanipuram Vinodgopal; Prashant V Kamat; Masaru Kuno
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-11-18
Journal Detail:
Title:  Nano letters     Volume:  -     ISSN:  1530-6992     ISO Abbreviation:  Nano Lett.     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-11-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088070     Medline TA:  Nano Lett     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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