In situ reversible tuning of chemical interface damping in mesoporous silica-coated gold nanorods via direct adsorption and removal of thiol

Chemical interface damping (CID) is a recently proposed plasmon decay channel in gold nanoparticles. However, thus far, a very limited number of studies have focused on controlling CID in single gold nanoparticles. Herein, we describe a new simple method for reversible tuning of CID in single gold n...

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Bibliographic Details
Published in:Analyst (London) 2023-08, Vol.148 (16), p.3719-3723
Main Authors: Hong, Yun A, Ha, Ji Won
Format: Article
Language:English
Subjects:
Adsorption
Alkanes
Damping
Gold
Molecular chains
Nanoparticles
Nanorods
Silicon dioxide
Surface chemistry
Surface plasmon resonance
Tuning
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Summary:Chemical interface damping (CID) is a recently proposed plasmon decay channel in gold nanoparticles. However, thus far, a very limited number of studies have focused on controlling CID in single gold nanoparticles. Herein, we describe a new simple method for reversible tuning of CID in single gold nanorods coated with a mesoporous silica shell (AuNRs@mSiO ). We used 1-alkanethiols with two different carbon chain lengths (1-butanethiol and 1-decanethiol) as adsorbates to induce CID. In addition, NaBH solution was used to remove the attached thiol from the AuNR surface. We confirmed the adsorption and removal of 1-alkanethiols on single AuNRs@mSiO and the corresponding changes in localized surface plasmon resonance (LSPR) peak wavelengths and linewidths. Furthermore, we investigated the effect of immersion time in NaBH solution on thiol removal from AuNRs@mSiO . Therefore, the LSPR properties and CID can be controlled, thereby paving the way for reversible tuning of CID by repeated adsorption and desorption of thiol molecules on single AuNRs@mSiO .
ISSN:0003-2654
1364-5528
DOI:10.1039/d3an00909b