Single-particle study: effects of mercury amalgamation on morphological and spectral changes in anisotropic gold nanorods

Lee, Jaeran; Kim, Geun Wan; Ha, Ji Won

doi:10.1039/d2an00104g

Cited by 10 publications

(39 citation statements)

References 23 publications

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“…Recently, dark‐field (DF) microscopy and spectroscopy were utilized to better understand Au–Hg amalgam formation and spectral variations in single gold nanorods (AuNRs) upon Hg amalgamation 4–8 . After the Hg amalgamation of AuNRs, they exhibited a remarkable shape change and became spherical, accompanied by a drastic blue shift in the LSPR peak 4,6 . Despite the previous studies on Hg amalgamation process, 4,5,9 the structural and spectral changes of AuNRs following Hg amalgamation have not been fully understood.…”

Section: Figurementioning

confidence: 99%

“…After spin‐casting the AuNR@mSiO 2 solution on a slide glass, AuNR@mSiO 2 was deposited as shown in Figure 1. The sample medium was then exchanged with the Hg solution, followed by the adsorption of Hg atoms onto the AuNR surfaces to form the Au–Hg core‐shell structure 4–6,13 . Afterwards, gradual Hg diffusion into the AuNR cores occurs to form the Au–Hg amalgam structure in a long time frame 13 …”

Section: Figurementioning

confidence: 99%

“…3 Recently, dark-field (DF) microscopy and spectroscopy were utilized to better understand Au-Hg amalgam formation and spectral variations in single gold nanorods (AuNRs) upon Hg amalgamation. [4][5][6][7][8] After the Hg amalgamation of AuNRs, they exhibited a remarkable shape change and became spherical, accompanied by a drastic blue shift in the LSPR peak. 4,6 Despite the previous studies on Hg amalgamation process, 4,5,9 the structural and spectral changes of AuNRs following Hg amalgamation have not been fully understood.…”

mentioning

confidence: 99%

“…[4][5][6][7][8] After the Hg amalgamation of AuNRs, they exhibited a remarkable shape change and became spherical, accompanied by a drastic blue shift in the LSPR peak. 4,6 Despite the previous studies on Hg amalgamation process, 4,5,9 the structural and spectral changes of AuNRs following Hg amalgamation have not been fully understood. Furthermore, in previous studies on bare AuNRs, it was challenging to investigate the spectral alterations induced by Hg amalgamation only, without disturbing the structural deformation that also alters the LSPR spectral property.…”

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confidence: 99%

“…The sample medium was then exchanged with the Hg solution, followed by the (e) Polarization-dependent scattering intensities of the three AuNRs@mSiO 2 as a function of polarization angles from 0 to 360 with 10 steps adsorption of Hg atoms onto the AuNR surfaces to form the Au-Hg core-shell structure. [4][5][6]13 Afterwards, gradual Hg diffusion into the AuNR cores occurs to form the Au-Hg amalgam structure in a long time frame. 13 After the formation of amalgamated AuNRs@mSiO 2 as described above, we conducted single-particle correlation studies to acquire a better understanding of the spatial orientation of the AuNR cores.…”

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Influence of mercury amalgamation on three‐dimensional orientation of single gold nanorods coated with mesoporous silica shell

Kim

2022

Bulletin Korean Chem Soc

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Herein, we performed single-particle studies to reveal three-dimensional spatial orientational changes in the AuNR cores coated with mesoporous silica shell (AuNRs@mSiO 2 ) following mercury (Hg) amalgamation. Defocused orientation imaging technique was used to determine the tilting angle of single AuNR cores after Au-Hg amalgam formation. Single amalgamated AuNR cores inside the silica shell were randomly tilted between 0 and 20 with respect to the glass slide on which they were deposited; no orientational changes were observed for AuNRs@mSiO 2 following Hg amalgamation. This study will help in better understanding the effect of silica shell on the morphological and orientation alterations of single AuNRs@mSiO 2 induced by Hg amalgamation.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Influence of mercury amalgamation on three‐dimensional orientation of single gold nanorods coated with mesoporous silica shell

Kim

2022

Bulletin Korean Chem Soc

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Chemical interface damping in single gold nanorods coated with silver via hot electron‐mediated photoreduction

Heo

2023

Bulletin Korean Chem Soc

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Herein, we investigated the photoreduction of silver (Ag) ions on gold nanorods coated with mesoporous silica shell (AuNRs@mSiO2) induced by hot electrons generated in Au via localized surface plasmon resonance (LSPR) excitation. In addition, we investigated chemical interface damping (CID) using pyridine as the adsorbate in single Ag‐coated AuNRs@mSiO2. The Ag deposition caused a blue shift and linewidth broadening of the LSPR peak of the AuNRs@mSiO2. The subsequent chemisorption of pyridine on Ag‐coated AuNRs@mSiO2 resulted in a red shift and additional LSPR linewidth broadening. Finally, we demonstrated real‐time time‐dependent changes in LSPR peak wavelength and linewidth during the sequential processes of hot electron‐mediated Ag deposition and pyridine adsorption on a single AuNR@mSiO2 in a flow cell. Therefore, we provided a deep understanding of hot electron‐triggered Ag coating and CID induced by pyridine adsorption in single AuNRs@mSiO2 coated with Ag.

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Effects of Amine Linkers with Different Carbon Chain Lengths at Guanine-Rich Polynucleotides on Chemical Interface Damping in Single Gold Nanorods

Lee

2022

Anal. Chem.

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DNA-functionalized gold nanoparticles (AuNPs) are used for various bioapplications, such as biosensor development and drug delivery. Nevertheless, no study has reported the effect of polynucleotide chains on chemical interface damping (CID), the most recently proposed plasmon damping pathway in single AuNPs. In this study, we conducted total internal reflection scattering measurements of gold nanorods (AuNRs) to reveal the CID effect induced by amine (NH 2 )-linked polynucleotides (or DNA) with guanine-rich sequences through the interaction between nitrogen and Au surfaces. Additionally, we elucidated the effect of a linear hydrocarbon chain length between NH 2 and DNA (NH 2 −C n −DNA, n = 6, 12, 18, 24) on spectral changes in single AuNRs. The localized surface plasmon resonance (LSPR) linewidth increased with an increasing number of linear carbon, from 6 to 24, due to the increase in van der Waals forces. Second, the effect of the direction (5′ or 3′ ends) of DNA attachment to the AuNR surfaces on LSPR spectral changes was investigated, and there was no significant difference in LSPR wavelength and full linewidth at half-maximum shifts caused by the DNA attachment directions (5′ or 3′ ends). Third, guanine-rich DNA can fold into four-stranded secondary structures called G-quadruplexes (GQs). We demonstrated the effect of linear carbon chain length, between NH 2 and GQs, on CID in single AuNRs. Lastly, a label-free detection of DNA hybridization events on single AuNRs was demonstrated for sensing applications. Thus, we provide an insight into the effect of amine-functionalized guanine-rich DNA with different carbon chains on LSPR spectral changes, including CID in single AuNRs.

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Single-particle study: effects of mercury amalgamation on morphological and spectral changes in anisotropic gold nanorods

Abstract: This study investigated the amalgamation of gold nanorods (AuNRs) exposed to Hg(II) solution and its effects on structural and spectral changes in single AuNRs using scanning electron microscopy and total...

Cited by 10 publications

References 23 publications

Influence of mercury amalgamation on three‐dimensional orientation of single gold nanorods coated with mesoporous silica shell

Influence of mercury amalgamation on three‐dimensional orientation of single gold nanorods coated with mesoporous silica shell

Chemical interface damping in single gold nanorods coated with silver via hot electron‐mediated photoreduction

Effects of Amine Linkers with Different Carbon Chain Lengths at Guanine-Rich Polynucleotides on Chemical Interface Damping in Single Gold Nanorods

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