Pd掺杂ZnO材料的制备及其对NO2气敏性能研究

Synthesis,Characterization and Nitrogen Dioxide Gas Sensing Applications of Pd Doped ZnO Material

以含Zn的金属有机骨架材料作为模板,通过热处理方法制备出颗粒分布相对均匀的ZnO纳米材料(颗粒尺寸大小<200 nm),分析比较了该ZnO半导体纳米材料及其Pd掺杂量质量分数分别为0.5%、1%和2%的Pdx%/ZnO(x=0.5、1.0、2.0)纳米材料对NO2气体的传感性能.研究结果表明,贵金属Pd的引入及ZnO载体颗粒度的降低均有利于提高Pd/ZnO纳米材料对NO2的灵敏度和选择性;Pd1%/ZnO纳米材料对体积分数为25×10^-6NO2的灵敏度值为46.6,高于纯ZnO、Pd0.5%/ZnO和Pd2%/ZnO对NO2的灵敏度值,其最佳工作温度为235℃,且当NO2体积分数降至5×10^-6时,该样品仍对NO2具有较好响应.

Nano-sized ZnO materials were prepared using the porous structure of metal-organic frameworks(MOFs)material as the precursor,and the sensing performance of this ZnO-based semiconductor nano-material with different ratios 0.5%、1%、2%of Pd(Pdx/ZnO,x=0.5,1.0,2.0)for the different concentrations of NO2 gas was studied.The sensitivity value of Pd1%/ZnO nanomaterials to volume fraction 2.5×10-5 volume fraction NO2 was 46.6 higher than that of pure ZnO,Pd0.5%/ZnO and Pd2%/ZnO for NO2.The optimum operating temperature was 235℃,and when the NO2 concentration was reduced to volume fraction 5×10^-6,the sample still could have gas sensing performance.