基于LSPR效应的可见光辅助型TMDs基气体传感器对痕量气体高效识别的研究

过渡金属硫族化合物（TMDs）气体传感器因在室温下可实现气体检测的优势成为气体检测领域重点关注的研究方向之一。然而，室温条件下TMDs基传感器对气体分子反应活化能不足，导致该类气体传感器仍难以实现对痕量目标气体的高灵敏检测和特异性识别。本项目拟通过金纳米颗粒修饰TMDs构筑复合结构敏感材料，基于贵金属纳米颗粒的局域表面等离激元共振（LSPR）光场增强特性，采用光场取代热场的手段，发展光场辅助的气体检测技术，用以指导可见光辅助型TMDs基气体传感器的设计。重点围绕复合结构参数、LSPR特性与气敏性能之间的内在关联展开研究，探索光学吸收特性对气敏响应的增益机理，建立共振吸收波长与器件选择特性间的关联机制，明晰基于LSPR效应的可见光辅助型气体传感器对痕量气体检测的工作原理，实现室温检测模式下对痕量目标气体的高效识别。本项目的实施为更有针对性地开发痕量气体高效检测技术提供有效思路。

Transition metal dichalcogenides (TMDs) based gas sensors have drawn great research interest in the field of gas detection owing to its room-temperature operation. However, the insufficient reaction activation energy occurs at room temperature, which hinders TMDs based gas sensors to achieve high-efficient detection for trace-level gas. Considering that the unique localized surface plasmon resonance (LSPR)-induced light field enhancement generated on gold nanoparticle, we intend to construct composite sensitive materials by modifying TMDs with gold nanoparticles, then developing light-assisted instead of heat-assisted gas detection mode to guide the design of visible-light-assisted TMDs based gas sensor. This project will focus on the internal relationship among the structure parameters, LSPR characteristics and gas-sensing performances. The correlation mechanism between the optical absorption characteristics and the gain of gas-sensing response will be explored, the parameter correlation among the wavelength of resonance absorption and the gas-sensing selectivity will be established, and the trace gas detection principle of visible-light-assisted gas sensor based on LSPR will be clarified, so as to realize the highly sensitive detection and specific recognition for trace gas at room temperature. This research will provide effective thoughtway for developing high-performance trace gas detection technology.