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Effects of Precursor Concentration on Dimensional Size, Defect State, and Gas Sensing Performance of MoS 2 Sheets Synthesized by Hydrothermal Method
Author(s) -
Lee Chang Min,
Park Geun Chul,
Ahn Cheol Hyoun,
Choi Jong Won,
Park Chae Hee,
Cho Hyung Koun,
Lim Jun Hyung,
Joo Jinho
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800079
Subject(s) - hydrothermal circulation , materials science , pulmonary surfactant , atmosphere (unit) , chemical engineering , hydrothermal synthesis , specific surface area , nanotechnology , analytical chemistry (journal) , chemistry , chromatography , organic chemistry , meteorology , catalysis , engineering , physics
The objective of this study is to investigate effects of precursor concentration on dimensional size, defect state, and gas sensing performance of MoS 2 sheets synthesized by hydrothermal method with various precursor concentrations (0.14–1.4  m ) in fixed HCl solution (7  m ). The MoS 2 sheets show a defect‐rich and strained structure. When precursor concentration is increased, dimensional size of the sheet is increased while the specific surface area of the sheet is decreased. The MoS 2 sensor made with 0.14  m precursor solution exhibits superior sensing performance with high sensitivity (372%) and rapid recovery time (<16 min) at room temperature in a 500 ppm NO 2 gas atmosphere due to enhanced active site resulting from the highest specific surface area. In addition, all MoS 2 samples show a complete recovery after response to NO 2 gas probably related to the defective and strained surface resulting from the use of HCl surfactant.

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