10.1021/la504365b.s001
Lei Zhang
Lei
Zhang
Liwei Dai
Liwei
Dai
Yun Rong
Yun
Rong
Zhenzhong Liu
Zhenzhong
Liu
Dingyi Tong
Dingyi
Tong
Youju Huang
Youju
Huang
Tao Chen
Tao
Chen
Light-Triggered Reversible Self-Assembly of Gold Nanoparticle
Oligomers for Tunable SERS
American Chemical Society
2015
PEG
Tunable SERSA photoresponsive amphiphilic gold nanoparticle
spiropyran units
UV light irradiation
AuNP
Gold Nanoparticle Oligomers
PSPMA
2015-01-27 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Light_Triggered_Reversible_Self_Assembly_of_Gold_Nanoparticle_Oligomers_for_Tunable_SERS/2212702
A photoresponsive
amphiphilic gold nanoparticle (AuNP) is achieved
through the decoration of AuNP with hydrophilic poly(ethylene glycol)
(PEG) and hydrophobic photoresponsive polymethacrylate containing
spiropyran units (PSPMA). Owing to the photoresponsive property of
spiropyran units, the amphiphilic AuNPs can easily achieve the controllable
assembly/disassembly behaviors under the trigger by light. Under visible
light, spiropyran units provide weak intermolecular interactions between
neighbored AuNPs, leading to isolated AuNPs in the solution. While
under UV light irradiation, spiropyran units in the polymer brushes
transform into merocyanine isomer with conjugated structure and zwitterionic
state, promoting the integration of adjacent AuNPs through π–π
stacking and electrostatic attractions, further leading to the formation
of Au oligomers. The smart reversible AuNP oligomers exhibited switchable
plasmonic coupling for tuning surface-enhanced Raman scattering (SERS)
activity, which is promising for the application of SERS based sensors
and optical imaging.