纳米WO_3掺杂CNTs材料的制备及其气敏性能测试

Preparation of Tungsten Oxide Doped with Carbon Nanotubes and Air-sensitive Property Testing

通过水热法合成纯WO3,并采用原位水热合成的方法制备不同碳纳米管掺杂量(0.2%,0.4%,0.6%,0.8%,1.0%)WO3/CNTS复合材料。复合之前,从四种纯WO3(K2SO4为添加的矿化剂且含量依次为15 g、30 g、40 g、0 g)中选取一种气敏性能最好的合成工艺。结果表明无K2SO4的合成工艺较好,同时对四种纯WO3进行了XRD表征,结果显示无K2SO4的氧化钨为两相晶体,且粒径较小。纯WO3与S-WCNTS掺杂制备复合材料,然后由复合材料制备气敏元件,对H2S进行气敏测试,结果表明S-WCNTS含量为0.6%的复合材料效果最佳,恢复性好且工作电压较低,可达2.68 V,且检出限可达到3 mg/kg,连续曲线的测定也较好。

During the experiment,the pure WO3 was prepared by hydrothermal synthesis and the composite of tungsten oxide and carbon nanotubes was carried out by in-situ hydrothermal synthesis,the composite of carbon nanotubes with different proportions（0.2%,0.4%,0.6%,0.8%,1.0%）.At the start of composite,an excellent synthesis was selected from the four pure of tungsten oxide（the content of K2SO4 15 g,30 g,40 g,0 g）whose gas-sensing properties were perfect.The results showed that the synthesis of the material without K2SO4 was the best choice.Then the four pure tungsten oxide was characterized by X-ray diffraction（XRD）.The results indicated that the material without K2SO4 contained two-phase crystal and the diameter was small.After preparation of doped with carbon nanotubes,composite materials were made of gas sensors to test the property of H2S,and the results suggested the doped proportion 0.6%of the S-WCNTS of the composite materials was the best and the recoverability acquired improvement,while it greatly improved the operating voltage up to 2.68 V and the detected limit could come up to 3ppm,and the determination of continuous curve was much better as well.