鈥淪mart鈥?Ag Nanostructures for Plasmon-Enhanced Spectroscopies

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• 作者：Chao-Yu Li ; Meng Meng ; Sheng-Chao Huang ; Lei Li ; Shao-Rong Huang ; Shu Chen ; Ling-Yan Meng ; Rajapandiyan Panneerselvam ; San-Jun Zhang ; Bin Ren ; Zhi-Lin Yang ; Jian-Feng Li ; Zhong-Qun Tian
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：November 4, 2015
• 年：2015
• 卷：137
• 期：43
• 页码：13784-13787
• 全文大小：332K
• ISSN：1520-5126

文摘

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 photocatalysis pathway by smartly blocking 鈥渉ot鈥?electrons. Astonishingly, the shell-isolated Ag nanoparticles (Ag SHINs), as 鈥渟mart plasmonic dusts鈥? reveal a 鈭?000-fold ensemble enhancement of rhodamine isothiocyanate (RITC) on a quartz substrate in surface-enhanced fluorescence. The presented 鈥渟mart鈥?Ag nanostructures offer a unique way for the promotion of ultrahigh sensitivity and reliability in plasmon-enhanced spectroscopies.