CAJ | 학술논문

以荧光活性2,2':5',2":5",2"'-四聚噻吩(4T)为传感元素,经过化学键合将其单层组装到玻璃基质表面,得到一种荧光薄膜材料.研究发现,光照下固定化4T在空气中易被氧化,薄膜荧光因而减弱.然而,将此薄膜经紫外光照处理1 h后,薄膜荧光虽然大大减弱,但不再随着时间发生变化.气态甲醛的存在会显著敏化薄膜荧光,在原荧光发射的短波方向(464 nm)产生新的荧光发射.该处荧光强度随着气相甲醛浓度增大而增强.特别需要指出的是,常见酸、碱和溶剂对甲醛传感均不产生明显影响,而且传感过程完全可逆.据此,认为该薄膜在甲醛气相检测中有可能获得应用.
이형광활성2,2':5',2":5",2"'-사취새분(4T)위전감원소,경과화학건합장기단층조장도파리기질표면,득도일충형광박막재료.연구발현,광조하고정화4T재공기중역피양화,박막형광인이감약.연이,장차박막경자외광조처리1 h후,박막형광수연대대감약,단불재수착시간발생변화.기태갑철적존재회현저민화박막형광,재원형광발사적단파방향(464 nm)산생신적형광발사.해처형광강도수착기상갑철농도증대이증강.특별수요지출적시,상견산、감화용제대갑철전감균불산생명현영향,이차전감과정완전가역.거차,인위해박막재갑철기상검측중유가능획득응용.
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(λ_(em)=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.