;;Hong-Juan SUN
. 2015, 46(16-石墨烯): 11-0.
Abstract (
)
Knowledge map
Save
Abstract: Graphene oxide (GOS) was prepared by Graphite oxide (GO) which was prepared by the Hummers method, then roasted the GOS under different temperatures to get different reduction degrees of graphene oxide (RGOS). Structure, functional groups, and surface topography of the samples were carried out by AFM,XRD, XPS, and SEM. The GOS and RGOS gas sensors were then fabricated by coating method. Results show that the basal spacing was increasing from 3.36? to7.78? after Graphite was oxidated. The Graphene oxide thickness is 1.08~1.72nm, for single or double GOS. When graphene oxide was reduced from 100℃ to 250℃, the basal spacing of the samples were decreasing from 8.87? to3.68?; With the increasing of the reduction degrees, the O/C atomic ratio was decreasing from 0.43 to 0.32, showed that the oxygen-containing functional groups were gradually reduced, the content of the C-OH functional group was decreased obviously and the C-O-C functional group was changed unconspicuously.
Graphene oxide and its lower reduced products show a good sensitivity to CH4 and H2 gas. The GOS sensor had a best sensitivity to CH4 and H2 gas which can reach 81% and 77.2%, respectively. The higher the reduction degrees, the less the oxygen-containing functional groups, the lower the gas sensitivity.