Berlin 2024 – scientific programme

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DS: Fachverband Dünne Schichten

DS 2: 2D Materials and their Heterostructures I: hBN, WSe2, MoS2

DS 2.10: Talk

Monday, March 18, 2024, 12:00–12:15, A 060

multi-strategy coordination enables WSe2 to achieve high-performance real-world detection of NO2 — •Yu Duan^1,2, Sam Zhang², and Yong Lei¹ — ¹Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany — ²Center for Advanced Thin Films and Devices, School of Materials and Energy, Southwest University, Chongqing, 400715, China

In recent years, WSe2 has become an ideal material for room-temperature NO2 gas sensing, but its low response and long response time limit its application. In this study, we combined multiple strategies of constructing a three-dimensional structure, introducing Se vacancies, Au nanoparticle sensitization, and 1T/2H-phase modulation. The synergistic effect was utilized to effectively enhance the gas adsorption, charge transfer degree, and carrier transport capacity of WSe2 and achieve high-performance NO2 detection. The prepared V-WAAP achieved high response (78.32%) with a short response time (33 s), and outstanding stability and selectivity for low concentration (1 ppm) NO2. The intrinsic factors of sensing performance improvement were comprehensively analyzed by combining the results of compositional and structural characterization. In addition, we verified its potential for practical applications by assembling a V-WAAP-based NO2 gas sensing equipment.

Keywords: WSe2 film; NO2 gas sensor; vertical structure; Au sensitization; phase modulation