华南理工大学学报(自然科学版) ›› 2006, Vol. 34 ›› Issue (3): 15-19.

• 化学化工、能源 • 上一篇    下一篇

氧化钨pH传感器制备及其在F- 和胶体溶液中的应用

陈东初1 付朝阳2 郑家燊2 李文芳1   

  1. 1. 华南理工大学 机械工程学院, 广东 广州 510640; 2. 华中科技大学 化学系, 湖北 武汉 430074
  • 收稿日期:2005-06-09 出版日期:2006-03-25 发布日期:2006-03-25
  • 通信作者: 陈东初(1972-) ,男,讲师,博士后,主要从事材料表面与应用电化学研究. E-mail:cdcever@tom. com
  • 作者简介:陈东初(1972-) ,男,讲师,博士后,主要从事材料表面与应用电化学研究.
  • 基金资助:

    广东省自然科学基金资助项目(05300370) ;华南理工大学自然科学基金资助项目(B012E5050840)

Preparation of Tungsten Oxide pH Sensor and Its Application to F—and Sol Solutions

Chen Dong-chu1  Fu Chao-yangZhen Jia-shenLi Wen-fang1   

  1. 1.College of Mechanical Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China;2.Dept.of Chemistry,Huazhong Univ.of Science and Tech.,Wuhan 430074,Hubei,China
  • Received:2005-06-09 Online:2006-03-25 Published:2006-03-25
  • Contact: 陈东初(1972-) ,男,讲师,博士后,主要从事材料表面与应用电化学研究. E-mail:cdcever@tom. com
  • About author:陈东初(1972-) ,男,讲师,博士后,主要从事材料表面与应用电化学研究.
  • Supported by:

    广东省自然科学基金资助项目(05300370) ;华南理工大学自然科学基金资助项目(B012E5050840)

摘要: 采用溶胶-凝胶法制备了氧化钨pH电极,在阳极氧化后的Ag丝表面涂敷掺杂了KCl的改性聚乙烯醇和Nafion膜,制备了固态Ag/AgCl参比电极,再由氧化钨pH电极与固态Ag/AgCl参比电极制备成氧化钨pH传感器,该传感器不需要参比溶液与陶瓷隔膜.测试结果表明:在pH值为2~11的范围内,该传感器有良好的电位(V ) 2pH响应线性关系,响应灵敏度为52. 6mV (以pH值变化为1来量度) ,测量精度可达0. 1个pH值;氧化钨pH电极具有耐HF腐蚀的能力,在5%~20% (质量分数)的HF溶液中的响应电位具有重现性,可用于HF溶液的浓度测量;氧化钨pH传感器还可以应用于胶体的测量,其响应时间小于1min.

关键词: 传感器, 氧化钨, pH值, 电极

Abstract:

A tungsten oxide pH electrode was first prepared by means of sol-gel method.Modified KCI-doped poly-vinyl alcohol and Nation film were next coated on anode·polarized Ag wire to obtain a solid Ag/AgCI reference elec-trode.Then,a tungsten oxide pH sensor without the inner solution and the ceramic plug was fabricated with the prepared pH electrode and the solid reference electrode.Tested results indicate that the prepared pH sensor possesses
a good voltage(V)-pH response linearity in the pH range of 2-1 1,with a response sensitivity of 52.6 mV(the voltage variation per unit pH value)and a measurement accuracy of 0.1 unit of pH value,and that the tungsten oxide pH electrode resists the corrosion of HF,with a perspective of the response voltage when being applied to the HF solution with a mass fraction of 5%-20%.meaning that the electrode adapts to the concentration determination
of HF solution.Moreover.the pH sensor works very well in sol solution,with a response time less than 1 min.

Key words: sensor, tungsten oxide, pH value, electrode