二维超支化共轭聚合物在TNT检测中的超级猝灭效应
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- 英文论文题名：Super quenching effect of 2D hyperbranched conjugated polymers in TNT detection
- 论文作者：马晓双 ; 崔月芝 ; 陶芙蓉 ; 郑冰 ; 于润慧
- 英文论文作者：Xiaoshuang Ma ; Yuezhi Cui ; Furong Tao ; Bing Zheng ; Huirun Yu ; Shandong Provincial Key Laboratory of Fine Chemicals ; School of Chemistry and Pharmaceutical Engineering ; Qilu University of Technology
- 年：2016
- 作者机构：齐鲁工业大学;
- 论文关键词：超支化 ; 二维 ; 共轭聚合物 ; 激子迁移 ; TNT
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十七分会：光化学
- 语种：中文
- 分类号：TQ560.72;O631
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十七分会 ; 光化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：180k
- 原文格式：D
- 会议级别：全国
摘要
近年来,在硝基芳烃爆炸物检测中,线性荧光性共轭聚合物由于具有"超级猝灭"效应而成为检测硝基芳烃的较有前景的传感材料。目前研究的大多是线型共轭聚合物,而对超支化共轭聚合物的研究尚不多见[1]。理论上,超支化共轭聚合物与线型共轭聚合物相比,会具有更强的"超级猝灭"效应。如Fig.1所示,对于线型聚合物来说,当某一位置与猝灭剂接触后,只有左右两侧在激子扩散距离(EDL)范围内产生的激子能被猝灭;而对于超支化共轭聚合物来说,距离接触点的一定范围内有n条共轭链,它们在整个二维EDL范围内产生的激子都可以被猝灭。因此,超支化共轭聚合物的猝灭速率(Ksv)要远远高于线型共轭聚合物。两种聚合物P1、P2的Stern-Volmer荧光猝灭曲线如Fig.2所示,它们的Ksv分别为2.49×10~4 M~(-1)和6.84×10~4 M~(-1)。在对TNT的响应方面,超支化共轭聚合物P_2相对于线型共轭聚合物P_1具有较高的灵敏度,表现出了更强的"超级猝灭"特征。
As Fig. 1 shows, for linear conjugate polymers(LCPs), when a certain position is in contact with the quenching agent, the exciton can be quenched in the exciton diffusion distance(EDL).On the contrary, in the range of the distance from the contact point of hyperbranched conjugate polymers(HCPs), there are a plurality of conjugated chains, which can be quenched by the planar exciton generated in the EDL range. Therefore, the HPs quenching speed(Ksv) is much higher than the LPs. Stern-Volmer fluorescence quenching curves are shown in Fig. 2, the Stern-Volmer quenching constants(K_(sv)) of P_1 and P_2 were 2.49 × 10~4 M~(-1) and 6.84 × 10~4 M~(-1), respectively. Comparing with LCPs, HCPs show excellent sensibility in the presence of TNT, which was a stronger "super quenching" effect.
As Fig. 1 shows, for linear conjugate polymers(LCPs), when a certain position is in contact with the quenching agent, the exciton can be quenched in the exciton diffusion distance(EDL).On the contrary, in the range of the distance from the contact point of hyperbranched conjugate polymers(HCPs), there are a plurality of conjugated chains, which can be quenched by the planar exciton generated in the EDL range. Therefore, the HPs quenching speed(Ksv) is much higher than the LPs. Stern-Volmer fluorescence quenching curves are shown in Fig. 2, the Stern-Volmer quenching constants(K_(sv)) of P_1 and P_2 were 2.49 × 10~4 M~(-1) and 6.84 × 10~4 M~(-1), respectively. Comparing with LCPs, HCPs show excellent sensibility in the presence of TNT, which was a stronger "super quenching" effect.
引文
[1]S.Rochat,T.M.Swager,ACS Appl.Mater.Interfaces.2013,11:4488.