Abstract
The quest for a proficient charge transport layer that enhances charge separation in multiple heterojunction composites remains a perpetual endeavor within the realm of NO2 gas sensors, aimed at attaining heightened sensitivity and response efficiency. Herein, based on the foundation of MoS2/TiO2 binary composite structure, Au-doped MoS2/TiO2 ternary composite structures with different doping content of Au were prepared via a simple hydrothermal synthesis process. The results indicate that the Au-MoS2/TiO2 ternary composite structure exhibits the highest sensitivity to NO2 gas at 500 ppm concentration at 50 °C under 4 mW/cm2 red LED illumination condition, with a response of 510 %, compared to the optimal response of 191 % for the binary composite structure materials. This work proposes the functionalization of MoS2/TiO2 heterojunction with Au, extending beyond the conventional noble metal decoration, and the potential utilization of the multiple heterojunctions for gas sensors.
Published Version
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