An Byeong-Kwan, Kwon Soon-Ki, Jung Sang-Don, Park Soo Young
School of Materials Science & Engineering, Seoul National University, Seoul, 151-744, Korea.
J Am Chem Soc. 2002 Dec 4;124(48):14410-5. doi: 10.1021/ja0269082.
A new class of organic nanoparticles (CN-MBE nanoparticles) with a mean diameter of ca. 30-40 nm, which exhibit a strongly enhanced fluorescence emission, were prepared by a simple reprecipitation method. CN-MBE (1-cyano-trans-1,2-bis-(4'-methylbiphenyl)ethylene) is very weakly fluorescent in solution, but the intensity is increased by almost 700 times in the nanoparticles. Enhanced emission in CN-MBE nanoparticles is attributed to the synergetic effect of intramolecular planarization and J-type aggregate formation (restricted excimer formation) in nanopaticles. On/off fluorescence switching for organic vapor was demonstrated with CN-MBE nanoparticles.
通过一种简单的再沉淀法制备了一类新型有机纳米颗粒（CN-MBE纳米颗粒），其平均直径约为30 - 40纳米，具有强烈增强的荧光发射。CN-MBE（1-氰基-反式-1,2-双-（4'-甲基联苯）乙烯）在溶液中的荧光非常微弱，但在纳米颗粒中强度增加了近700倍。CN-MBE纳米颗粒中增强的发射归因于分子内平面化和纳米颗粒中J型聚集体形成（受限激基缔合物形成）的协同效应。利用CN-MBE纳米颗粒实现了对有机蒸汽的荧光开/关切换。
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