基于聚集诱导发光金纳米簇构筑发光超薄膜  

Ultrathin Luminescence Film Based on Gold Nanoclusters with Aggregation-Induced Emission

作　　者：管伟江[1] 周文娟[1] 吕超[1] 

机构地区：[1]化工资源有效利用国家重点实验室北京化工大学,北京100029

出　　处：《化学学报》2016年第11期929-934,共6页Acta Chimica Sinica

基　　金：国家重点基础研究发展计划(973项目;No.2014CB932103);国家自然科学基金(Nos.21575010;21375006)资助~~

摘　　要：选用带负电的谷胱甘肽包裹的金纳米簇(GSH-AuNCs)和牛血清白蛋白包裹的金纳米簇(BSA-AuNCs),与带正电荷的聚烯丙胺(PAH)通过静电作用以层层组装的方式制备了发黄色荧光的GSH-AuNCs/PAH薄膜和发红色荧光的BSA-Au NCs/PAH薄膜.在保证荧光强度的前提下,采用具有聚集诱导发光(AIE)效应的GSH-AuNCs能够大幅度降低薄膜厚度,有利于提高传感薄膜的响应速度和灵敏度.据此,以BSA-Au NCs/PAH薄膜作为参比层,GSH-AuNCs/PAH薄膜作为响应层,设计并构建了一种新型的比率荧光复合薄膜传感体系,并以2,4,6-三硝基甲苯(TNT)为例对其传感特性进行了研究.Solution-based fluorescent probes usually need to be fabricated into fluorescent films for device application. The fabricated fluorescent films can have not only the original advantages of probes （e.g., high sensitivity and selectivity） but also several unique properties, such as tunable shape and size, recycling, non-invasion, good stability and portability, and real-time detection. However, the sensitivity of fluorescent films is often reduced by the aggregation-caused quenching （ACQ） effect during the film formation： fluorophores with high concentration inherently tend to aggregate through intermolecular n-n in- teractions. Moreover, the sensing performances of the fluorescent film are significantly influenced by the diffusion rate of analytes： the thicker the films, the slower the response time towards target molecules. Therefore, aggregation-induced emis- sion （AIE） materials are urgently needed to be developed to overcome these shortcomings. On the other hand, excellent photostability could be better for the practical applications in the integrated sensor devices. However, most of the present AIEgens are n-conjugated organic molecules with poor ability against photobleaching. Interestingly, several fluorescent gold nanoclusters （AuNCs） with higher photostability were discovered to have AIE property. In this work, two kinds of negative- ly-charged fluorescent AuNCs were selected： bovine serum albumin capped AuNCs （BSA-AuNCs） and AIE-active glutathi- one capped AuNCs （GSH-AuNCs）. Quartz glass slides were alternately dipped into a poly（allylamine） （PAH） solution and AuNCs solutions to fabricate GSH-AuNCs/PAH （yellow-emitting） and BSA-AuNCs/PAH （red-emitting） fluorescent ultrathin films, respectively. As expected, the photoluminescence quantum yield of GSH-AuNCs is two-fold higher in GSH-AuNCs/PAH ultrathin films than in solution. The fluorescence of （GSH-AuNCs/PAH）5 ultrathin film could be quenched effectively by 2,4,6-trinitrotoluene （TNT） in 10 min, while

关 键 词：金纳米簇 聚集诱导发光 发光薄膜 层层组装 爆炸物 

分 类 号：TB383.2[一般工业技术—材料科学与工程] O657.3[理学—分析化学]