水热法合成BiVO_(4)微球的乙醇传感特性研究

Ethanol sensing performance of BiVO_(4) microspheres synthesized by hydrothermal

运用简单的一步水热法制备出一种钒酸铋(BiVO_(4))粉体材料,采用X射线衍射(XRD)和扫描电子显微镜(SEM)对材料的物相和形貌进行表征。重点研究了该材料对于氨水、甲醛、甲醇和乙醇4种气体的敏感特性。结果表明,实验所得的BiVO_(4)粉末为不规则微球,尺寸为800~900 nm。实验温度为460℃时,该气体传感器对于体积分数为500×10-6的乙醇气体的响应值可达到5.50,对乙醇具有良好的敏感性和选择性。本实验具有操作简便、知识全面和主题新颖等优点,通过BiVO4气敏元件的合成、表征及分析的综合性实验教学,进一步激发学生对于材料的科研兴趣,夯实科研基础,提升科学素质,增强创新实践能力。

The bismuth vanadate(BiVO_(4))powder material was successfully fabricated by a simple one-step hydrothermal method.The structure and morphology of BiVO_(4) were characterized by X-ray diffraction(XRD)and scanning electron microscope(SEM).The gas-sensing properties of the obtained materials were analyzed for ammonia,formaldehyde,methanol and ethanol.It is shown that the BiVO_(4) samples obtained in the experiment are anomalous microspheres with an average size of 800 to 900 nm.When the experimental temperature is 460℃,the response value of the gas sensor to 500×10-6 ethanol gas is about 5.50,and it shows good sensitivity and selectivity to ethanol.The experiment has the advantages of simple operation,comprehensive knowledge and novel themes.The synthesis,characterization and analysis of the gas-sensitive components of BiVO4 through comprehensive experimental teaching could further stimulate the interest of students in scientific research on materials.Meanwhile,it will help consolidate the foundation of scientific research and enhance the scientific literacy and innovation capabilities of students.