Direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics. Journal Article uri icon

Overview

abstract

  • 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.

publication date

  • January 1, 2013

Date in CU Experts

  • March 13, 2015 12:20 PM

Full Author List

  • McDonald MP; Eltom A; Vietmeyer F; Thapa J; Morozov YV; Sokolov DA; Hodak JH; Vinodgopal K; Kamat PV; Kuno M

author count

  • 10

citation count

  • 0

Other Profiles

International Standard Serial Number (ISSN)

  • 1530-6984

Electronic International Standard Serial Number (EISSN)

  • 1530-6992

Additional Document Info

start page

  • 5777

end page

  • 5784

volume

  • 13

issue

  • 12