高分散负载Zn的石墨炔纳米墙可控构筑及可见光激发室温气敏特性研究

本征带隙石墨炔有望成为新一代高性能室温气敏材料。然而，其优异气敏性能发挥受限于二维片层堆叠和功能化颗粒团聚。本项目拟以多孔ZnO纳米墙为限域生长模板，利用热蒸发石墨炔粉及其与ZnO局域位点的原位还原反应，可控制备高分散负载Zn纳米颗粒的石墨炔纳米墙 NO2敏感材料。通过研究制备工艺对产物微观组织的影响规律、Zn纳米颗粒负载对室温NO2气体灵敏度的影响规律、不同性质的可见光（波长、功率）对室温NO2响应-恢复时间的作用规律，揭示负载Zn的石墨炔纳米墙的生长和调控机制、获得室温NO2气体灵敏度与Zn纳米颗粒尺寸、分布状态和负载量之间的内在关系、阐明Zn纳米颗粒负载对石墨炔纳米墙NO2气体响应的增敏机理以及可见光激发在NO2吸附-脱附过程中的作用机制，实现室温下对100ppb级NO2高灵敏、快响应的气体探测。本项目的实施，对开发高性能室温型NO2传感器核心敏感材料提供有价值的理论基础和实验依据。

Graphdiyne is proposed as new generation of promising gas sensing materials at room temperature due to its intrinsic band gap. However, its excellent gas sensing performances are limited by the intersheet stacking and functional nanoparticles aggregation. In this project, graphdiyne nanowalls supported highly dispersed Zn nanoparticles based NO2 sensing materials will be assembled by combination of thermal evaporation of graphdiyne powders and its local reduction with the confinement growth template of ZnO nanowalls. By investigating of the dependence of the relative technology parameters of thermal evaporation on the microstructures of the as prepared samples, the effect of Zn nanoparticle support on the room temperature NO2 gas sensitivity and the function rule of the distinctive characteristics (wavelength and power) of visible light on the room temperature NO2 gas response-recovery time, this project aims to reveal the growth and tuning mechanisms of graphdiyne nanowalls supported Zn nanoparticles, obtain the interrelationship between the room temperature NO2 sensitivity and the Zn nanoparticles size, distribution state and loading capacity, clarify the NO2 sensitization mechanisms of graphdiyne nanowalls by Zn nanoparticles support and function mechanisms of visible light irradiation on the NO2 gas adsorption and desorption process. On this basis, the high gas sensitivity and rapid response to 100ppb NO2 at the room temperature will be realized. Overall, the implementation of this project will provide valuable theoretical bases and experimental evidence for the development key gas sensing materials of high performance room temperature type NO2 gas sensors .