Effects of Precursor Concentration on Dimensional Size, Defect State, and Gas Sensing Performance of MoS2 Sheets Synthesized by Hydrothermal Method. Issue 20 (4th July 2018)

• Record Type: Journal Article
• Authors: Lee, Chang Min; Park, Geun Chul; Ahn, Cheol Hyoun; Choi, Jong Won; Park, Chae Hee; Cho, Hyung Koun; Lim, Jun Hyung; Joo, Jinho
• Other Names: Yoon Seok‐Jin guestEditor.; Park Hyung‐Ho guestEditor.
• Is Part Of: Physica status solidi. Volume 215:Issue 20(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-07-04
• Subjects: gas sensor -- hydrothermal synthesis -- morphology -- MoS2 -- precursor concentration; Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201800079
• Languages: English
• ISSNs: 1862-6300

Abstract

Abstract : The objective of this study is to investigate effects of precursor concentration on dimensional size, defect state, and gas sensing performance of MoS2 sheets synthesized by hydrothermal method with various precursor concentrations (0.14–1.4 m ) in fixed HCl solution (7 m ). The MoS2 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 MoS2 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 NO2 gas atmosphere due to enhanced active site resulting from the highest specific surface area. In addition, all MoS2 samples show a complete recovery after response to NO2 gas probably related to the defective and strained surface resulting from the use of HCl surfactant. Abstract : The authors investigate effects of precursor concentration on dimensional size, defect state, and gas sensing performance of MoS2 sheets synthesized by hydrothermal method with various precursor concentrations in fixed HCl solution. The results demonstrate that the morphology and defect state of MoS2 played a key role in the sensing behavior for NO2 .