"Smart" Ag Nanostructures for Plasmon-Enhanced Spectroscopies.
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 "hot" electrons. Astonishingly, 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 ultrahigh sensitivity and reliability in plasmon-enhanced spectroscopies.
Chao-Yu
CY
Li
Meng
M
Meng
Sheng-Chao
SC
Huang
State Key Laboratory of Precision Spectroscopy, East China Normal University , Shanghai 200062, China.
Lei
L
Li
Shao-Rong
SR
Huang
Shu
S
Chen
Ling-Yan
LY
Meng
Rajapandiyan
R
Panneerselvam
State Key Laboratory of Precision Spectroscopy, East China Normal University , Shanghai 200062, China.
San-Jun
SJ
Zhang
Bin
B
Ren
Zhi-Lin
ZL
Yang
Jian-Feng
JF
Li
Zhong-Qun
ZQ
Tian