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光致变色分子和AIE单元共掺杂纳米胶束:光控、可逆荧光调变
陈尚军1, 朱为宏2
1.上海师范大学;2.华东理工大学
摘要:
利用嵌段共聚物聚苯乙烯-b-聚丙烯酸(PS-b-PAA)封装二噻吩乙烯光致变色分子(BTO)和染料分子(ED)制备了纳米胶束BTO@Nm、ED@Nm和BTO-ED@Nm,胶束尺寸分布窄(63~201 nm),在水溶液中具有高度的稳定性和分散性.封装作用诱导ED产生明显的聚集诱导荧光增强效应(AIE),可使ED@Nm和BTO-ED@Nm在500~700 nm范围呈现出明显的荧光.与单体BTO类似,纳米胶束BTO@Nm和BTO-ED@Nm仍然保持从无色(λmax=308 nm)到深蓝色(λmax= 595 nm)可逆光致变色性能,且至少可逆转变5次以上抗疲劳性能.利用BTO及其变环体(c-BTO)与ED之间的能量转移作用,在紫外光和可见光的交替照射下,实现对BTO-ED@Nm荧光(565 nm)定量可逆调控,且至少可调控5次以上.
关键词:  聚集诱导荧光增强  光致变色  荧光调控  纳米胶束
DOI:
分类号:
基金项目:国家自然科学基金青年基金(21503136);上海市科学技术委员会“扬帆计划”(14YF1409200)
Nano-micelles encapsulated photochromic molecules and AIE units: light controlled reversible fluorescence modulation
CHEN Shangjun1, ZHU Weihong2
1.College of Life and Environmental Sciences,Shanghai Normal University;2.Key Laboratory for Advanced Materials,East China University of Science and Technology
Abstract:
Nano-micelles containing photochromic diarylethene molecules(BTO) and/or aggregation-induced emission (AIE) characteristic chromophores (ED),BTO@Nm,ED@Nm,and BTO-ED@Nm,were prepared via self-assembly of an amphiphilic block copolymer polystryene-b-polyacrylic acid (PS-b-PAA).The as-prepared nano-micelles havenarrow size distribution (61-210 nm),excellent dispersity,and stabilityin aqueous solutions.Typical AIE properties and obvious fluorescence in the range from 500 to 700 nm were observed both in ED@Nm and BTO-ED@Nmdue to the aggregation of ED by the encapsulation of the nano-micelles.Similar to BTO,BTO@Nm and BTO-ED@Nm exhibited reversilbe photochromic reacition between colorless solution (λmax=308 nm) and deep blue (λmax= 595 nm) and nice fatigure resistance,in which the cycle between colorless and colored solution can be repeated over 5 times.Moreover,the fluorescence of BTO-ED@Nm (565 nm) can be quantitatively and reversibly modulated via alternative irradiation of Uv (365 nm) and visible light as a result of the fluorescence resonance energy transfer (FRET) among BTO,the closed isomer c-BTO,and ED.The reversibly fluorescencemodulated process can be perfermed more than 5 times.
Key words:  aggregation-induced emission (AIE)  photochromism  fluorescence modulation  nano-micelle