摘要
采用钨粉过氧化聚钨酸法制备三氧化钨溶胶,并掺杂氯铂酸。采用旋涂法制备含有铂的氢致变色三氧化钨(Pt-WO_(3))纳米薄膜。采用X射线衍射仪、场发射扫描电子显微镜和X射线能谱分析等方法分析薄膜的性质,测试结果表明:薄膜为非晶态;薄膜表面平整,没有凸起及裂痕,金属单质铂均匀分布在薄膜表面;薄膜表面均匀分布着三氧化钨分子,呈疏松多孔结构。搭建透射式光纤氢气传感系统,当氢气分子存在时,掺杂铂的三氧化钨薄膜在铂的催化下发生化学反应,进而改变薄膜的折射率,通过测试透射光强变化情况反演氢气浓度。研究结果表明,匀胶机转速为3100 r/min、旋涂时间为60 s、退火温度为400℃、退火时间为60 min的条件下制备的Pt-WO_(3)薄膜,在体积分数5%的H_(2)下通氢响应时间约为62 s,通氢前后信号响应幅值变化率约为91.54%,并且该薄膜具有良好的重复性和稳定性。
The tungsten trioxide sol is prepared using the tungsten powder-hydrogen peroxide-polytungstic acid method,doped using chloroplatinic acid,and spin-coated into a platinum-doped nanotungsten trioxide film exhibiting hydrogeninduced discoloration.The film properties are analyzed using X-ray diffraction,field-emission scanning electron microscopy,and energy-dispersive spectroscopy.The film is amorphous and exhibits a flat,bump-and crack-free surface over which platinum metal and loose porous-structured tungsten trioxide particles are evenly distributed.A transmission optical-fiber hydrogen sensor system is fabricated using the prepared film.When hydrogen molecules are present,the film chemically reacts through platinum catalysis,thereby changing the film refractive index.The hydrogen concentration is determined by measuring the transmitted light intensity.The hydrogen-sensitive film spin-coated for 60 s using a homogenizer rotating at 3100 r/min and subsequently annealed at 400℃for 60 min exhibits a hydrogen-passing response time of approximately 62 s at a H_(2) concentration of 5%.The average change rate of the signal response amplitude is 91.54%before and after hydrogen sensing,and the film exhibits good repeatability and stability.
作者
王星佺
卞正兰
Wang Xingquan;Bian Zhenglan(School of Electronics and Information Engineering,Shanghai University of Electric Power,Shanghai 200120,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2023年第7期409-414,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(62105196)。
