NO2 gas sensors based on CVD tungsten diselenide monolayer

Autor(es)

Wu, Yichuan ^{[1, 2, 3]} ; Joshi, Nirav ^{[4, 2]} ; Zhao, Shilong ^{[5, 6, 1, 7, 8]} ; Long, Hu ^{[5, 6, 7, 8]} ; Zhou, Liujiang ^[9] ; Ma, Ge ^[10] ; Peng, Bei ^[3] ; Oliveira Jr, Osvaldo N. ; Zettl, Alex ^{[5, 6, 7, 8]} ; Lin, Liwei ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Tsinghua Univ, Tsinghua Berkeley Shenzhen Inst, Shenzhen 518055 - Peoples R China

^[2] Univ Calif Berkeley, Berkeley Sensor & Actuator Ctr, Berkeley, CA 94720 - USA

^[3] Univ Elect Sci & Technol China, Sch Mech & Elect Engn, Chengdu 611731 - Peoples R China

^[4] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13560970 Sao Carlos, SP - Brazil

^[5] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 - USA

^[6] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 - USA

^[7] Univ Calif Berkeley, Mat Sci Div, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 - USA

^[8] Univ Calif Berkeley, Kavli Energy NanoSci Inst, Berkeley, CA 94720 - USA

^[9] Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054 - Peoples R China

^[10] China Acad Ind Internet, Dept Intelligent Ind Res, Beijing 100084 - Peoples R China

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 529, NOV 1 2020.
• Citações Web of Science: 0

Resumo

Two-dimensional (2D) transition metal dichalcogenides (TMDs) are promising for gas sensors owing to their large surface-to-volume ratios, but the long recovery times stemming from the slow molecular desorption have been an important limitation. In this work, we report on a sensor for nitrogen dioxide (NO2) made with a diselenide (WSe2) monolayer synthesized via chemical vapor deposition, which functions within a range of concentrations from 100 ppb to 5 ppm and at various temperatures, including room temperature. When operated at an optimized temperature of 250 degrees C, the WSe2 sensor exhibited the fast recovery, with the response (tau(res)) and recovery (tau(rec)) times of 18 s and 38 s, respectively, when exposed to 100 ppb NO2 The sensor also features high selectivity toward NO2 in the presence of other target gases, in addition to reversibility and long-term stability within 60 days. The overall characteristics of the WSe2 sensor make it suitable to monitor indoor/outdoor environments, mainly if further optimization is made with sensor design based on a model for the sensing mechanism we present in this paper. (AU)

• Processo FAPESP: 16/23474-6 - Nanomateriais baseados em heterostruturas: síntese e suas propriedades de detecção de gás
• Beneficiário: Niravkumar Jitendrabhai Joshi
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 14/23546-1 - Sensores sensíveis e seletivos fabricados com nanofios de óxido de Ni e Zn
• Beneficiário: Niravkumar Jitendrabhai Joshi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado