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

Kim, Geun Wan; Ha, Ji Won

doi:10.1002/bkcs.12586

Cited by 3 publications

(7 citation statements)

References 20 publications

(60 reference statements)

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“…However, a blue shift was clearly observed for the LSPR peak of AuNRs@Ag under continuous light irradiation, which can be attributed to the hot electron-mediated photoreduction and deposition of Ag on the AuNR surface. A similar blue shift of the LSPR peak was previously observed for AuNRs@Hg after Hg amalgamation. ,, Furthermore, Ag deposition resulted in a broadening of the LSPR line width (or the full width at half-maximum) of AuNRs@Ag, which can be ascribed to a strong surface plasmon damping in the AuNRs induced by Ag deposition. ,, …”

Section: Results and Discussionsupporting

confidence: 75%

“…A similar blue shift of the LSPR peak was previously observed for AuNRs@Hg after Hg amalgamation. 32,36,37 Furthermore, Ag deposition resulted in a broadening of the LSPR line width (or the full width at half-maximum) of AuNRs@Ag, which can be ascribed to a strong surface plasmon damping in the AuNRs induced by Ag deposition. 32,36,37 Next, the effect of the light irradiation method on the LSPR properties during the formation of the Ag layer on the AuNR min and off for 16 min.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Effect of Light Irradiation on Hot Electron-Mediated Photoreduction of Silver Ions on Single Gold Nanorods without a Reducing Agent

Lee

2023

J. Phys. Chem. C

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This study investigated the hot electron-mediated photoreduction of silver (Ag) ions on gold nanorods (AuNRs) exposed to a silver nitrate (AgNO3) solution under white light irradiation without a reducing agent and the effect of white light irradiation on the structural and spectral changes in single AuNRs. The hot electron-mediated Ag deposition was confirmed to occur upon white light irradiation, producing AuNRs@Ag (core@shell) structures. No noticeable changes in the size of AuNRs@Ag in the transverse and longitudinal directions were observed as compared with bare AuNRs. The Ag deposition on AuNRs led to an increased scattering intensity as well as a blue shift and line width broadening of the localized surface plasmon resonance (LSPR) peak. Additionally, we investigated the effect of using different light-on/off cycle conditions on the LSPR properties during the formation of the Ag layer on AuNRs. Moreover, increasing the AgNO3 concentration resulted in more pronounced LSPR peak shifts. Overall, fundamental information on the effect of the light irradiation method used for the hot electron-mediated Ag deposition without a reductant on the structural and LSPR changes is provided at the single-particle level.

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Section: Results and Discussionsupporting

confidence: 75%

Section: ■ Results and Discussionmentioning

confidence: 99%

Effect of Light Irradiation on Hot Electron-Mediated Photoreduction of Silver Ions on Single Gold Nanorods without a Reducing Agent

Lee

2023

J. Phys. Chem. C

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“…Figure S7 shows a blue shift in the LSPR peak of AuNRs@mSiO 2 under continuous light irradiation, which can be attributed to the hot electron‐mediated photoreduction and deposition of Ag on the AuNR surface. Furthermore, Ag deposition resulted in a broadening of the LSPR linewidth (or the full width at a half maximum, FWHM) of AuNRs@mSiO 2 , which can be ascribed to a strong surface plasmon damping in the AuNRs induced by Ag deposition 32–34 …”

Section: Figurementioning

confidence: 99%

“…Furthermore, Ag deposition resulted in a broadening of the LSPR linewidth (or the full width at a half maximum, FWHM) of AuNRs@mSiO 2 , which can be ascribed to a strong surface plasmon damping in the AuNRs induced by Ag deposition. [32][33][34] Subsequently, we examined the CID process in a single Ag-coated AuNRs@mSiO 2 , which arises from the strong interaction of adsorbate molecules with the nanoparticle surface. In CID, hot electrons generated upon the LSPR excitation are directly transferred from AuNR@Ag to the LUMOs of the adsorbate via a direct electron transfer process (Figure 3).…”

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confidence: 99%

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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“…Mercury (Hg) is a highly toxic pollutant among the other heavy metals in air, water, and soil. − The most stable inorganic form of Hg is the divalent ion (Hg 2+ ), which is widely distributed in the ecosystem. , Hg 2+ is water-soluble, nonbiodegradable, and highly reactive, causing severe health problems even at the lowest concentration that accumulates in living organisms through the food chain. , Several methods have been successfully used to detect and determine Hg 2+ . − ,− In these methods, plasmonic nanoparticles (NPs), such as gold nanoparticles (AuNPs), have been widely used for Hg detection and purification by probing the changes in the optical properties of AuNPs owing to their strong interaction with Hg. , …”

Section: Introductionmentioning

confidence: 99%

Tuning Chemical Interface Damping: Competition between Surface Damping Pathways in Amalgamated Gold Nanorods Coated with Mesoporous Silica Shells

Alizar,

Ramasamy,

Kim

et al. 2023

JACS Au

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The mechanism of mercury (Hg) amalgamation in gold nanorods coated with a mesoporous silica shell (AuNRs@mSiO 2 ) and the effect of chemical treatments on the localized surface plasmon resonance (LSPR) spectral changes in single amalgamated AuNRs@ mSiO 2 remains unclear. In this study, we investigated Hg amalgamation and inward Hg diffusion in single AuNRs@mSiO 2 without structural deformation via dark-field scattering spectroscopy and X-ray photoelectron spectroscopy. Then, we investigated the chemisorption of thiol molecules on single amalgamated AuNRs@Hg-mSiO 2 . Unlike previous studies on single AuNRs, the thiolation on single AuNRs@Hg-mSiO 2 resulted in a redshift and line width narrowing of the LSPR peak within 1 h. To determine the chemical effect, we investigated the competition between two surface damping pathways: metal interface damping (MID) and chemical interface damping (CID). When we exposed amalgamated AuNRs@Hg-mSiO 2 to 1-alkanethiols with three different carbon chain lengths for 1 h, we observed an increase in the line width broadening with longer chain lengths owing to enhanced CID, demonstrating the tunability of CID and LSPR properties upon chemical treatments. We also investigated the competition between the two surface damping pathways as a function of the time-dependent Au−Hg surface properties in AuNRs@Hg-mSiO 2 . The 24-h Hg treatment resulted in increased line width broadening compared to the 1-h treatment for the same thiols, which was attributed to the predominance of CID. This was in contrast to the predominance of MID under the 1-h treatment, which formed a core−shell structure. Therefore, this study provides new insights into the Hg amalgamation process, the effect of chemical treatments, competition between surface decay pathways, and LSPR control in AuNRs@mSiO 2 .

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

Cited by 3 publications

References 20 publications

Effect of Light Irradiation on Hot Electron-Mediated Photoreduction of Silver Ions on Single Gold Nanorods without a Reducing Agent

Effect of Light Irradiation on Hot Electron-Mediated Photoreduction of Silver Ions on Single Gold Nanorods without a Reducing Agent

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

Tuning Chemical Interface Damping: Competition between Surface Damping Pathways in Amalgamated Gold Nanorods Coated with Mesoporous Silica Shells

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