应用化学 ›› 2010, Vol. 27 ›› Issue (08): 960-964.DOI: 10.3724/SP.J.1095.2010.90622

• 研究论文 • 上一篇    下一篇

基于硫堇掺杂的聚乙烯醇薄膜的光波导传感器检测硫化氢气体

阿不都卡德尔·阿不都克尤木1,2*,阿布力孜·伊米提2   

  1. (1.喀什师范学院生命与环境科学系 喀什 844007;2.新疆大学化学化工学院 乌鲁木齐 830046)
  • 收稿日期:2009-09-15 修回日期:2009-12-21 出版日期:2010-08-10 发布日期:2010-08-10
  • 通讯作者: 阿不都卡德尔·阿不都克尤木,男,讲师; E-mail:abdukader@sina.com; 研究方向:光波导传感器和敏感材料
  • 基金资助:
    国家自然科学基金资助项目(20665004)

Detection of H2S Gas by Optical Waveguide Sensor Based on Thionine Doped Polyvinyl Alcohol Film

Abdukader Abdukayum1,2*, Abliz Yimit2   

  1. (1.Department of Life and Environmental Sciences,Kashgar Teachers College,Kashgar 844007;
    2.College of Chemistry and Chemical Engineering,Xinjiang University,Urumqi 830046)
  • Received:2009-09-15 Revised:2009-12-21 Published:2010-08-10 Online:2010-08-10

摘要:

采用旋转甩涂法将硫堇掺杂的聚乙烯醇薄膜固定在K+交换玻璃光波导表面,研制出一种高灵敏硫化氢气体传感器。 传感膜与硫化氢(H2S)气体作用时,薄膜颜色从紫色变为无色,从而降低薄膜对倏逝波的吸收,使传感器的输出光强度(信号)增强。 采用流动注射法对H2S气体进行检测。 实验结果表明,H2S传感器对浓度在0.14~56 mg/m3范围的H2S气体具有良好的线性响应(r=0.99667),检出限为0.11 mg/m3(S/N=3),相对标准偏差为4.0%,响应时间(t90)<2 s。 该传感器具有灵敏度高、响应快、可逆性和重复性好等特点。

关键词: 传感器, 光波导, 薄膜, 硫化氢

Abstract:

A highly sensitive hydrogen sulfide gas sensor was developed by immobilization of thionine dye doped polyvinyl alcohol film onto the surface of a K+ exchanged glass optical waveguide via a spin-coated method. The sensing film presents a color change from purple to colorless when exposed to H2S gas, causing a decrease in the evanescent wave absorption of the film, and an increase of the output light intensity of the sensor(signal). The sensor performance was tested for the detection of H2S gas by controlled flow injection. The experimental result shows that the sensor has a good linear response(r=0.99667) to H2S gas in a range of 56 mg/m3 to 0.14 mg/m3. The detection limit for H2S is 0.11 mg/m3(S/N=3). The RSD of output light intensity is 4.0% and response time(t90)<2 s. This sensor shows high sensitivity, fast response, good reversibility and repeatability.

Key words: sensor, optical waveguide, film, hydrogen sulfide

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