Selective band gap manipulation of graphene oxide by its reduction with mild reagents
Journal article, 2015
Graphene oxide (GO) can be used as an electron acceptor for polymeric solar cells but still band gap matching for electron donor and acceptor demands more study. The generation of the exciton in such materials is intimately related to the optical band gap. However, exciton dissociation is related to transport band gap that controls the device performance, particularly the open circuit voltage and short circuit current. Therefore, the modulation of the optical gap is useful because it results into tuning of the transport gap. The interest of the present work is to study the reduction of graphene oxide (GO) at room temperature, using environmental friendly reagents like glucose, fructose and ascorbic acid for the modulation of a band gap. It has been found that glucose and fructose function effectively only in presence of NH
4
OH. Although ascorbic acid can reduce GO alone, NH
4
OH speeds up the reaction. The optical band gap of GO can be reduced and tuned effectively from 2.7 eV to 1.15 eV.
Author
M.A. Velasco-Soto
Centro de Investigacion en Materiales Avanzados
S. A. Perez-Garcia
GENES - Group of Embedded Nanomaterials for Energy Scavenging
Centro de Investigacion en Materiales Avanzados
J. Alvarez-Quintana
Centro de Investigacion en Materiales Avanzados
GENES - Group of Embedded Nanomaterials for Energy Scavenging
Yu Cao
Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering
Lars Nyborg
Chalmers, Materials and Manufacturing Technology
L. Licea-Jiménez
GENES - Group of Embedded Nanomaterials for Energy Scavenging
Centro de Investigacion en Materiales Avanzados
Carbon
0008-6223 (ISSN)
Vol. 93 967-973Subject Categories
Materials Engineering
DOI
10.1016/j.carbon.2015.06.013