NDLI: Tunable UV-visible absorption of SnS<sub>2</sub> layered quantum dots produced by liquid phase exfoliation

Content Provider	Royal Society of Chemistry (RSC)
Author	Ilanchezhiyan, P. Kumar, G. Mohan Kang, Tae Won Cho, Hak Dong Chan, A. Sattar Lee, Dong J. Zhang, Lei Fu, Xiao Panin, Gennady N.
Copyright Year	2017
Abstract	4H-SnS2 layered crystals synthesized by a hydrothermal method were used to obtain via liquid phase exfoliation quantum dots (QDs), consisting of a single layer (SLQDs) or multiple layers (MLQDs). Systematic downshift of the peaks in the Raman spectra of crystals with a decrease in size was observed. The bandgap of layered QDs, estimated by UV-visible absorption spectroscopy and the tunneling current measurements using graphene probes, increases from 2.25 eV to 3.50 eV with decreasing size. 2–4 nm SLQDs, which are transparent in the visible region, show selective absorption and photosensitivity at wavelengths in the ultraviolet region of the spectrum while larger MLQDs (5–90 nm) exhibit a broad band absorption in the visible spectral region and the photoresponse under white light. The results show that the layered quantum dots obtained by liquid phase exfoliation exhibit well-controlled and regulated bandgap absorption in a wide tunable wavelength range. These novel layered quantum dots prepared using an inexpensive method of exfoliation and deposition from solution onto various substrates at room temperature can be used to create highly efficient visible-blind ultraviolet photodetectors and multiple bandgap solar cells.
Starting Page	1820
Ending Page	1826
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	9
Issue Number	5
Journal	Nanoscale
DOI	10.1039/c6nr09022b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Photosensitivity Hydrothermal circulation Graphene Electronvolt Band gap Ultraviolet Quantum tunnelling Wavelength
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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