Journal
MICROCHEMICAL JOURNAL
Volume 181, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.microc.2022.107781
Keywords
Localized surface plasmon resonance; Refractive index sensing; Inflection points; Mercury amalgamation; Silica coated gold nanorods
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Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2018R1C1B3001154, 2019R1A6A1A11053838]
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The mesoporous silica coated gold nanorods show improved refractive index sensitivity after mercury amalgamation. Investigation of LSPR scattering inflection points helps to determine the sensing performance of the nanoparticles.
Mesoporous silica coated gold nanorods (AuNRs@mSiO(2)) are very promising as multifunctional localized surface plasmon resonance (LSPR) sensors. Here, we described the refractive index (RI) sensitivities of single AuNRs@mSiO(2) before and after mercury (Hg) amalgamation without their structural deformation. The amalgamated AuNRs@mSiO(2) showed significant improvement in the RI sensitivity than the AuNRs@mSiO(2) before the Hg amalgamation with the respect to RI changes of local environments. LSPR scattering inflection points (IFs) were then investigated to determine the LSPR sensing performance of single AuNRs@mSiO(2) before and after Hg amalgamation. The RI sensitivity at the LSPR IF in the low-energy side was higher than the wavelength shifts in the conventional LSPR maximum peak. Furthermore, the amalgamated AuNRs@mSiO(2) exhibited better RI sensitivity at the LSPR IFs than non-amalgamated AuNRs@mSiO(2). Thus, we provide a deeper understanding of how Hg amalgamation affects RI sensitivity in single AuNRs@mSiO(2).
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