我室李剑峰教授在JACS发展题为"Smart" Ag nanostructures for plasmon-enhanced spectroscopies的研究论文

相关链接：http://pubs.acs.org/doi/abs/10.1021/jacs.5b09682

Abstract:
Silver is an ideal candidate for surface plasmon resonance (SPR)-based applications because of its great optical cross-section in the visible region. However, the uses of Ag in plasmon-enhanced spectroscopies have been limited due to their interference via direct contact with analytes, the poor chemical stability, and the Ag+ release phenomenon. Herein, we report a facile chemical method to prepare shell-isolated Ag nanoparticle/tip. The as-prepared nanostructures exhibit an excellent chemical stability and plasmonic property in plasmon-enhanced spectroscopies for more than one year. It also features an alternative plasmon-mediated photo-catalysis pathway by smartly blocking “hot” electrons. Aston-ishingly, the shell-isolated Ag nanoparticles (Ag SHINs), as “smart plasmonic dusts”, reveal a ~1000-fold ensemble enhancement of rhodamine isothiocyanate (RITC) on a quartz substrate in surface-enhanced fluorescence. The presented “smart” Ag nanostructures offer a unique way for the promotion of ultra-high sensitivity and reliability in plasmon-enhanced spectroscopies.