二维柔性ZnO纳米墙/石墨烯气敏传感器的缺陷协同及拮抗效应研究

ZnO纳米墙和石墨烯作为优良的二维气敏活性材料，在制备过程中都会不可避免的引入各种缺陷。将石墨烯片和ZnO纳米墙结合，构筑具有三维立体气体传输通道的异质结构气体传感器，它们在保持各自的物理和电学性质的同时，驻存在异质材料中的双方缺陷必然会发生协同及拮抗效应，从而对异质材料的气敏性能产生潜在的重要影响。本项目通过构筑二维柔性ZnO纳米墙/石墨烯异质结构气敏传感器，研究ZnO纳米墙和石墨烯间的界面电子传输特性，揭示缺陷效应对二维ZnO纳米墙/ 石墨烯气敏传感器的电子载流子密度的影响机制，确立载流子密度与表面损耗层宽度间的函数关系，建立缺陷效应－载流子密度－表面损耗层宽度的内在关联性，研究影响二维ZnO纳米墙/石墨烯气敏性能的缺陷协同或拮抗作用机制。上述问题的解决对于研究两相界面间的物理性能具有重要的科学意义，对于发展新型气敏传感器具有重要的工程应用价值。

Both the ZnO nanowalls and graphene are extinguishly active gas sensing materials. However, defects are always introduced unavoidably in the sythesis process. Heterojunctional gas sensors take posession of three dimensional gas transport channels when graphene is integreted with ZnO nanowalls.The synergistic and antagonism effect of the defects lied in ZnO nanowall and graphene would be generated while their physical and electrical properties were preserved for themselves, which had an important influence on the gas sensing performance of the heterojunctions. In this project, electron transport at the interface between ZnO nanowall and graphene are researched by constructing two dimensional soft ZnO nanowall/graphene heterojunction gas sensors. The synergistic and antagonism effect from the defects lied in the heterojunction on the carrier density is revealed. The function relationship between the carrier density and surface depletion width is researched. The interrelationship among synergistic and antagonism effect from the defects, carrier density and surface depletion width is built. The infuluence mechanism of synergistic and antagonism effect from the defects on the gas sensing performents of the two dimensional soft ZnO nanowall / graphene heterojunction is researched. Solving the above question, it has scientific significance for the interfacial physical properties. Moreover, it has important engineering application value for the development new gas sensors.