Metal sulfide semiconductor nanorods have attracted much attention because of their potential use as a photo-responsive component of optical/electrical devices. In the present study, we report a simple solvothermal method of the Bi2S3 nanorod synthesis exploiting dimethyl sulfoxide (DMSO) as both a solvent and a sulfur source in the presence of an organic bromide such as tetraethylammonium bromide (Et4NBr). The organic bromide conducts dual roles; it promotes the decomposition of DMSO to produce reactive sulfur species and reacts with Bi species to produce an intermediate product of bismuth oxybromide (BiOBr) that reacts further with the sulfur compounds. These dual roles of organic bromide facilitate the synthesis of Bi2S3 nanorod without extra sulfur sources. The production of Bi2S3 nanorods is successful when the organic bromide is used, but not when KBr is used, and is dependent upon the amount of organic bromide. With controlled parameters of reaction temperature and time, production of BiOBr intermediates and growth of Bi2S3 nanorod from the surface of BiOBr are observed along with the identification of the organic sulfur-Bi complexes during the synthesis. Based on the experimental outcomes, the process of the Bi2S3 nanorod synthesis is proposed. The synthesized Bi2S3 nanorods have a band gap energy of 1.5 eV along with a photoresponse time of 920 ms, thus demonstrating semiconductor photosensitivity.
|Number of pages||10|
|Publication status||Published - 2022 Jun 6|
Bibliographical noteFunding Information:
This work was supported by a grant from the Korean Research Foundation funded by the Korean Government (NRF-2019R1A2C1010629) and by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20214000000090, Fostering human resources training in advanced hydrogen energy industry).
© 2022 The Royal Society of Chemistry.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics