Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (3): 524.

• Articles • Previous Articles     Next Articles

Preparation and Sensing Performance to Formaldehyde Vapor of Quaterthiophene-Based Fluorescent Films

LIU Tai-Hong, NIE Yun-Xia, HE Gang, ZHANG Yuan, DING Li-Ping, FANG Yu*   

  1. Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Materials Science, Shaanxi Normal University, Xi′an 710062, China
  • Received:2009-08-13 Online:2010-03-10 Published:2010-03-10
  • Contact: FANG Yu. E-mail: yfang@snnu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20674048, 20803046)、国家自然基金科学仪器基础研究专项基金(批准号: 20927001)、科技部“八六三”计划项目(批准号: 2007AA03Z349)和陕西师范大学优秀博士论文资助项目(批准号: X2009Y1308)资助.

Abstract:

A fluorescent film was fabricated by chemical immobilization of 2,2′∶5′,2″∶5″,2″′-quaterthiophene(4T), which was employed as a sensing element, onto an amine-terminated glass wafer surface. It has been demonstrated that the fluorescence emission of the film is not stable in air, and it decreases along with increasing scanning time. However, the emission can be stabilized by treatment of the film under UV light irradiation in air. It was found with interesting that a new emission(λem=464 nm) appears after divulging the film in formaldehyde vapor. The intensity of the emission increases along with increasing the exposure time. Further experiments reveale that the fluorescence sensitization is fully reversible and highly selective. Common acids, ammonia and alcohols have little effect upon the fluorescent emission of the film. Therefore, it is anticipated that the film may be developed into a formaldehyde sensor. In addition, a possible sensing mechanism was proposed according to known photochemistry of oligothiophene and the experimental results from present study.

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