A high-sensitivity H2S gas sensor based on optimized ZnO-ZnS nano-heterojunction sensing material |
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| Affiliation: | 1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China;2. State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Donghua University, Shanghai 201620, China;2. State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;3. College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. National Engineering Research Centre for Magnesium Alloys, Chongqing 400030, China;3. Department of Applied Physics, Chongqing University, Chongqing 400044, China;4. Department of Physics, COMSATS Institute of Information Technology, Lahore 54000, Pakistan;5. Department of Physics, University of Sargodha, Sargodha 40100, Pakistan;1. Department of Nano-Optical Engineering, Korea Polytechnic University, 2121 Jeongwang-dong, Shiheung City, Gyongggi-do, Republic of Korea;2. School of Intelligent Mechatronic Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul, Republic of Korea |
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| Abstract: | This paper reports a high-performance H2S gas sensing material that is made of ZnO nanowires (NWs) modified by an optimal amount of ZnS to form nano-heterojunctions. Compared with the intrinsic ZnO-NWs, the three differently modified nano-heterostructure material ZnO-ZnS-x (x = 5, 10, 15) shows significant improvement in sensing performance to H2S at the working temperatures of 100−400 °C, especially in the low temperature range (<300 °C). The chemiresistive sensor with ZnO-ZnS-10 sensing-material exhibits the largest response signal to H2S among all the other ZnO-ZnS-x (x = 5, 10, 15, 20) sensors. Its response signal to 5 ppm H2S at 150 °C is about 2.7 times to that of the ZnO-NWs sensor. Besides, the ZnO-ZnS-10 sensor also features satisfactory selectivity and repeatability at 150 °C. With the technical advantage attributed to the reduction of the redesigned band gap at the interface between ZnO and ZnS, the ZnO-ZnS heterostructure sensor rather than the traditional ZnO-NWs sensor can be used for high-sensitivity application at low working temperature. |
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| Keywords: | ZnO-ZnS heterojunction Hydrogen sulfide Gas sensor Sensitivity detection Selectivity Band gap |
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