期刊
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
卷 189, 期 6, 页码 721-737出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10426507.2013.855773
关键词
Graphene oxides; thionation; boron sulfides; metathesis
资金
- Center for Bio-Inspired Solar Fuel Production, an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001016]
- Department of Defense through the Army Research Office (ARO) [W911NF-12-1-0420]
We show that thionation of graphene oxide sheets is possible concomitantly with reduction of graphene oxide through a high-temperature (up to 500 degrees C) solid/gas metathetical reaction process by employing gaseous boron sulfides as a thionation reagent which can effectively prevent the graphene oxide sheets from restacking during the heating. The X-ray photoelectron (XPS) and energy dispersive X-ray (EDS) spectroscopic studies revealed that reaction products have the S:O atomic ratios of about 2:1. The deconvolution of the high-resolution S2p XPS spectra of the product showed that about 90% of the sulfur atoms in the products are present in the form of C-SH. Ellman assay results indicated that practically all the thiols act as a free thiol which can participate in disulfide bond formation. From the thermogravimetric analysis (TGA) studies up to 600 degrees C, the thiol functional groups in the products was found to be more thermally stable than hydroxyl groups. The estimated Tauc optical gap of the products is about 0.03 eV, which corroborates the reduced nature of the products.
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