蛋膜结构WO3纳米材料的制备及其H2S气敏性能

摘要

The WO3 nano-material with eggshell membrane biomorphology was successfully prepared using eggshell membrane as a template by an easy and environment-friendly aqueous soakage technique followed by calcination treatment.The phase composition and microstructure of the prepared WO3 nano-material were characterized by XRD and TEM, and the gas sensing properties of gas sensors fabricated with the prepared WO3 nano-material was evaluated via the static volumetric method. The results show that the as-synthesized material is monoclinic WO3 which replicated the interwoven meshwork conformation of eggshell membrane exactly. The sensitivity of gas sensor to H2S (volume fraction of 30×10-6) reaches 89 at 200 ℃ with a short response time of less than 2 s.%以鸡蛋壳内膜为模板,通过简单环保的液相浸渍技术结合煅烧工艺制备了具有蛋膜结构特征的WO<,3>纳米材料.利用XRD、SEM对其物相、结构进行了表征.结果表明:采用此方法制备的WO<,3>纳米材料为单斜晶相,且很好地复制了蛋膜的交叉网状结构.利用该材料制成气敏元件,并采用静态配气法测试了元件的气敏性能.研究发现:元件在200℃下对体积分数为30×10<,-6>的H<,2>S气体的灵敏度高达89,响应时间仅为1s多.