针对造纸厂硫化氢的高性能纳米α-Fe_2O_3/TiO_2气敏传感器  

A High Performance Hydrogen Sulfide Gas Sensor Based on α-Fe_2O_3/TiO_2 Nanocomposite for Paper Mills

作　　者：徐志武 沈文浩[1] XU Zhiwu;SHEN Wenhao(State Key Laboratory of Pulp and Paper Engineering, South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《造纸科学与技术》2019年第1期70-75,共6页Paper Science & Technology

基　　金：广东省自然科学基金项目(2016A030313478);华南理工大学制浆造纸国家重点实验室自主创新研究基金项目(2017ZD03)

摘　　要：针对被大众所忽视的造纸厂空气污染问题,以其中主要污染成分硫化氢为目标气体,采用液相反应工艺与后续退火工艺相结合的方法制备了α-Fe_2O_3/TiO_2复合纳米气敏传感器。首先,采用XRD,TEM和红外光谱对气敏材料的微观结构和化学组成进行了表征。其次,研究了纳米α-Fe_2O_3/TiO_2气敏传感器对硫化氢气体的气敏性能。研究结果表明,所制备的复合纳米材料纯度较高,以此为基础的纳米α-Fe_2O_3/TiO_2气敏传感器对体积分数为50×10^(-6)的硫化氢灵敏度为15.6,在120℃的工作温度下,比纯的纳米TiO_2的灵敏度提升到6.8倍,与大多数文献报道的金属氧化物气敏传感器工作温度300℃相比,工作温度下降了60%,传感器的响应与硫化氢浓度之间存在良好的线性关系,同时还具有较快的响应/恢复时间和良好的硫化氢选择性。Since H2S has been revealed as one of the main gaseous pollutants in the ambient air of pulp and paper mills, a high performance of α-Fe2O3/TiO2 gas sensor for the H2S detection was developed by a liquid phase reaction process with the subsequent annealing process. Firstly, the microstructure and chemical composition of the synthesized gas sensing materials were characterized by the methods of XRD, TEM and FTIR. Subsequently, the H2S gas sensing properties of the developed α-Fe2O3/TiO2 nanocomposite sensor were studied. The study results showed that, the compositions of α-Fe2O3/TiO2 were of high purity. Operated at the temperature of 120 ℃, for a volume fraction of 50×10^-6 H2S, the response of the α-Fe2O3/TiO2 gas sensor was 15.6, which was 6.8 times higher than that of the pure TiO2 material. Compared with the most reported metal oxides gas sensors whose operation temperatures were around 300 ℃, the operating temperature of the developed α-Fe2O3/TiO2 gas sensor was reduced by 60%. Moreover, there was a good linear relationship between the response and the concentration of H2S, and the developed α-Fe2O3/TiO2 nanocomposite sensor also possessed the fast response/recovery time and excellent H2S selectivity.

关 键 词：造纸 硫化氢 α-Fe2O3/TiO2 气敏传感器 

分 类 号：TB332[一般工业技术—材料科学与工程]