研究开发满足未来高灵敏度、高选择性、低功耗需求的高性能气敏材料及其传感器是气体传感器领域研究的重要课题。二维过渡金属硫化物纳米材料具有和石墨烯类似的结构，但其独特的元素组成、电子结构及表面化学键预示着该类材料是很有前景的新型气敏材料。本项目致力于二维过渡金属硫化物纳米材料气敏特性、气敏机理及其无线气体传感器的研究，将采用高温化学浴法制备不同厚度的二硫化钼、二硫化钨二维纳米材料；在材料可控制备的基础上系统研究不同条件下二硫化钼、二硫化钨二维纳米材料的气敏特性，不同表面性质对气敏响应的影响，以期阐明其气敏响应机理；通过把二维纳米材料与LCR谐振天线集成制备无线无源气体传感器，研究不同气体对传感器谐振频率的调谐规律及调谐机制，获得性能优化的传感器。本项目的研究将为二维过渡金属硫化物纳米材料在气体传感器领域应用奠定重要科学和技术基础。

High sensitivity, high selectivity gas sensing materials are needed for the future integrated, wireless, low energy consumption gas sensors.Transition metal dichalcogenides, such as molybdenum disulfide and tungsten disulfide, monolayers have caused much attention due to their interesting structure and properties analogous to graphene.While, the intrinsic semidonducting properties and tunable band-gap make two-dimentional transition metal dichalcogenides even better candidates for optoelectronic devices than graphenes，which stimulate us to work on the gas sensing performance and gas sensing mechanism of this promising material. We proposed to synthesize high quality molybdenum disulfide and tungsten disulfide nanosheets with controllable thickness by a chemical bath method,following with high temperature treatment in S containing gas flow. Protype gas sensors will be fabricated by depositing the nanosheets on the interdigitial electrodes. The gas sensing performance of the sensors will be tested by exposing to the gas pulse of donor or acceptor molcules with various functional chemical bond or electronic structure. Since the gas sensing properties are closely related to the material surface states,the gas sensing performance of the nanosheets with Pt nanoparticles loading will be investigated. To clarify the effect of oxygen species on the gas sensing behavior of the dichalcogenides, these materials will be characterized under both oxygen exhaust condition and oxygen rich condition. The gas sensing mechanism of the transition metal dichalcogenide nanosheets would be clarified by analyzing the gas sensing information obtained from different conditions. Considering the potential application of the molybdenum disulfide and tungsten disulfide nanosheets in the future wireless sensing network, the wireless gas sensors will be developed by integrating the nanosheets with the interdigitial electrodes of the LCR resonators.The gas sensing behavior of these passive wireless gas sensors will be investigated for a better understanding of the gas sensing mechanism of the two-dimensional transition metal dichalcogenide nanomaterials.