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129th General Meeting of Korean Chemical Society & Exposition Single-Particle Spectroelectrochemistry: Electrochemical Tuning of Plasmonic Properties via Mercury Amalgamation in Mesoporous Silica Coated Gold Nanorods without Structural Deformation

Submission Date :
2 / 17 / 2022 , 15 : 51 : 13
Abstract Number :
129021730327
Presenting Type:
Oral Presentation
Presenting Area :
Analytical Chemistry - Oral Presentation of Young Analytical Chemists II
Authors :
Yola Yolanda Alizar, Ji Won Ha1,*
Chemistry, University of Ulsan, Korea
1Department of Chemistry, University of Ulsan, Korea
Assigned Code :
ANAL2.O-12 Assigend Code Guideline
Presenting Time :
FRI, 09 : 44
This paper presents the elucidation of the mercury (Hg) amalgamation induced by electrochemical reduction on gold nanorods coated with mesoporous silica shell (AuNRs@mSiO2) by single-particle spectroelectrochemistry. First, the silica shell significantly enhanced the structural stability of AuNR cores after Hg amalgamation with application of linear sweep voltages (LSVs). Thus, it became possible to focus on the spectral changes of AuNRs@mSiO2 induced by the deposition of Hg without disturbance of structural deformation that also strongly affects the localized surface plasmon resonance (LSPR) properties. Second, following the application of LSV in the presence of Hg2+, a remarkable blue shift of LSPR peak was observed, caused by lowering of the work function due to the Hg adsorption, donating electron density to Au. Furthermore, the LSPR linewidth also showed a dramatic increase after the Hg deposition with LSV. Last, direct observation of the evolution of the Hg amalgamation process was presented by monitoring real-time LSPR peak and LSPR linewidth shifts of single AuNRs@mSiO2 in the Hg solution according to application of electrochemical potential. Moreover, the results showed the possibility of in-situ tuning of the LSPR properties of AuNRs@mSiO2 by the Hg deposition via electrochemical potential manipulations without disturbance of structural variations of AuNR cores. Keywords: Spectroelectrochemistry, Au-Hg amalgamation, Gold nanorods, Mesoporous silica shell, Single particle spectroscopy, Localized surface plasmon resonance