Pd单原子对氧化铟气敏特性的调控及其机制

常规纳米催化剂由于尺寸分散、形态多样可能产生多重催化叠加效应，在其用于气体传感器表面修饰时不利于实现超高的选择性，本项目基于界面调控在氧化铟表面合成Pd单原子，开展其对氧化铟纳米结构的气敏特性调控及机理研究；主要包括：Pd单原子原位制备工艺及其参数调控，Pd单原子负载量、分布位点等与氧化铟气敏特性之间的相关性，气敏反应的动力学过程及特性调控的内在机制，超高选择性气体传感器构筑及应用初探；项目着重解决界面限域效应下高稳定性Pd单原子制备与机制、以及Pd单原子对氧化铟电子结构及其气敏反应历程的调控两个科学问题；旨在发展基于氧化铟的Pd单原子原位制备方法与形成机制，建立单原子特征参数与气敏特性之间的关联性，揭示Pd单原子对氧化铟气敏性能调控的内在机制，实现对若干目标气体的初步检测应用。本项目研究将为构筑催化剂修饰的半导体气体传感器提供新思路，也为超高选择性气体传感器元器件的研制提供材料基础。

Conventional nano-catalysts may produce multiple catalytic superposition effect due to their size dispersion and morphology diversity, which is not conducive to the realization of ultra-high selectivity when they are used for the surface modification of gas sensors. In this project, Pd single-atom catalyst is synthesized on surfaces of In2O3 based on the interface control, and the gas sensing performance manipulation and mechanism research of In2O3 nanostructure by Pd single-atom was carried out, mainly including in situ preparation of Pd single-atom and its parameters regulation; the correlation between the loading capacity, distribution sites of Pd single-atom and gas sensing properties of In2O3; the construction and preliminary application of ultra-high selectivity gas sensors. The project focuses on two scientific problems: the preparation and mechanism of high stability Pd single-atom with interface confinement effect, and the regulation of Pd single-atom on the electronic structure and gas-sensitive reaction process of In2O3. It aims to develop the in-situ preparation method of Pd single-atom based on In2O3, establish the correlation between single-atom characteristic parameters and gas sensing performances, reveal intrinsic mechanism of Pd single-atom to regulate gas sensing properties, and realize the preliminary detection and application of several target gases. The research of this project will provide new ideas for the construction of catalyst modified semiconductor gas sensor, and offer material basis for the development of ultra-high selectivity gas sensor components.