Efficient mixed-solvent exfoliation of few-quintuple layer Bi2S3 and its photoelectric response. (20th July 2017)

• Record Type: Journal Article
• Authors: Guo, Yaohui; Zhao, Qiyi; Yao, Zehan; Si, Keyu; Zhou, Yixuan; Xu, Xinlong
• Is Part Of: Nanotechnology. Volume 28:Number 33(2017)
• Publication Date: 2017-07-20
• Subjects: Bi2S3 nanosheet -- liquid phase exfoliation -- photoelectric response -- electronic structure; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/aa79ce
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: A scalable liquid exfoliation of layered Bi2 S3 employing a mixed-solvent strategy was used for the fabrication of Bi2 S3 nanosheets. We found that 10% deionized water in 90% isopropyl alcohol is the best mixed solvent for the efficient and effective exfoliation of layered Bi2 S3 . These results are consistent with the absorbance spectra and enthalpy of mixing theory. The obtained Bi2 S3 nanosheets had few-quintuple layers and were investigated by transmission electron microscopy, atomic force microscopy, and Raman spectroscopy. These Bi2 S3 nanosheets can be used to fabricate large-scale thin films by filtration method; the films demonstrated sensitive photoelectric response with the rise and decay response of photocurrent on the sub-second scale under visible light excitation. The electronic structures of bulk and one-quintuple layer Bi2 S3 are calculated by first-principle calculation for better understanding of the photoelectric response. A green mixed-solvent processing of Bi2 S3 opens up the potential application of Bi2 S3 optoelectric films to photoelectric detection and solar energy conversion devices.