Page 96 - Multifunctional Photocatalytic Materials for Energy

Graphene photocatalysts 85

Fig. 5.3 SEM (A) and TEM (B) images of GO, and TEM (C) and HRTEM (D) images of the
G1.0 sample.
Reproduced with permission from Q. Xiang, J. Yu, M. Jaroniec, Enhanced photocatalytic
H 2 -production activity of graphene-modified titania nanosheets, Nanoscale 3 (9) (2011)
3670–3678. Copyright 2011, Royal Society of Chemistry.

of the graphene-based composites because of their high hydrophilicity and good
dispersion in water. For example, rGO/CdS nanorod composites were prepared us-
ing a one-step, microwave-assisted hydrothermal method in an ethanolamine-water
solution [90]. In another work, CdS/graphene composites were synthesized by a
facile solvothermal method in dimethyl sulfoxide (DMSO), in which the forma-
tion of CdS nanoparticles and the reduction of GO to rGO occurred simultaneously
[91]. It was found that graphene nanosheets can serve as a two-dimensional material
where the CdS nanoparticles interact to avoid aggregation. Graphene nanosheets
decorated with CdS clusters were prepared via a solvothermal process using GO,
2−
2+
Cd(Ac) 2 as the source of Cd , and DMSO as the source of S and solvent [89].
The reduction of GO into rGO and the formation of CdS clusters on the graphene
surface occurred simultaneously during the solvothermal process. Similar results
were obtained in the case of rGO/ZnIn 2 S 4 nanocomposites prepared by a one-pot
solvothermal method and a mixed solvent of N,N-dimethylformamide and ethylene
glycol where the formation of ZnIn 2 S 4 nanosheets on highly reductive rGO were
simultaneously achieved [93].