Investigation of pH Effect on Gold Nanorod Synthesis

Cheng, Jing; Wang, Chuanzhen; Xiong, Bin; He, Yan

doi:10.1002/jccs.201190128

Cited by 43 publications

(24 citation statements)

References 38 publications

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“…The aspect ratio of the nanorod only reduces gradually until turning to nanospheres. This has also been proved by the TEM results in a previous work . As a result, the spectra changes are slower and more uniform during the reaction process.…”

Section: Resultssupporting

confidence: 75%

“…Hydrogen peroxide (30% v/v) was used as the main component of the etching solution. In the etching reaction, hydrogen peroxide is used as the oxidant, and the electric potential difference between H 2 O 2 /H 2 O (E ϴ = 1.776 V) and AuBr 4 − /Au (E ϴ = 0.854 V) ensures its occurrence of the following reaction :

6 H^{+} + 3 {normalH}_{2} {normalO}_{2} + 2 Au + 8 normalB {normalr}^{-} = 2 AuB {r^{4}}^{-} + 6 {normalH}_{2} O

The result of this reaction is the shift of resonance scattering peak of AuNRs. Initially, we used UV‐Vis spectrometer to record the shift of plasmonic resonance peak during the etching reaction.…”

Section: Resultsmentioning

confidence: 99%

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Direct observation of single plasmonic metal nanoparticle reaction in microcolumn with chromatic‐aberration‐free LASER light‐sheet scattering imaging

et al. 2019

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Direct observation and characterization of individual noble metal nanoparticles (MNPs) and their chemical reactions have attracted much attention owing to their unique physical and chemical properties and extensive applications. To achieve high‐throughput information‐rich evaluation of MNPs, it would be advantageous to combine highly efficient microcolumn separation technology with on‐column high resolution plasmonic imaging technique. Here, with a chromatic aberration‐suppressed supercontinuum laser light‐sheet scattering imaging system and colorimetric detection, we monitored oxidation process of single gold nanorods inside a capillary under gravity driven flow, and observed heterogenous reaction intermediates and pathways for different MNP surface modifications. The results suggest that molecular interactions and bindings with MNPs have a significant impact on their reaction kinetics. This high‐throughput on‐line single particle detection technique could be potentially applied to chemical and biochemical reaction studies of other MNPs.

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Section: Resultssupporting

confidence: 75%

6 H^{+} + 3 {normalH}_{2} {normalO}_{2} + 2 Au + 8 normalB {normalr}^{-} = 2 AuB {r^{4}}^{-} + 6 {normalH}_{2} O

Section: Resultsmentioning

confidence: 99%

Direct observation of single plasmonic metal nanoparticle reaction in microcolumn with chromatic‐aberration‐free LASER light‐sheet scattering imaging

et al. 2019

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“…It remains a subject of considerable ongoing research interest how pH can be used to tune the LSPR wavelength of GNRs despite several reported researches (Busbee et al 2003;Cheng et al 2011;Ye et al 2013;Ye et al 2012;Zhu et al 2010). Fig.…”

Section: Effect Of Hcl Amountmentioning

confidence: 99%

Controlled synthesis of monodisperse gold nanorods with different aspect ratios in the presence of aromatic additives

Wang

Guo

et al. 2014

J Nanopart Res

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“…The same result can be observed by increasing the amount of ligands due to earlier saturation of the Au nanorod surfaces as well as reducing the pH value by increasing the amount of hydrochloric acid. This effect can be attributed to different micelle stabilities of the CTAB micelles at different pH values [29]. SEM images of Au rods with lower and larger aspect ratios are shown in Figures 5(a) and 5(b).…”

Section: Resultsmentioning

confidence: 98%

Single-Photon-Single-Electron Transition for Interpretation of Optical Spectra of Nonspherical Metal Nanoparticles in Aqueous Colloidal Solutions

Köhler

Kuhfuß

Witthöft

et al. 2018

Journal of Nanomaterials

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Noble metal nanoparticles—especially shape anisotropic particles—have pronounced resonances in the optical spectrum. These sensitive absorption modes attract great interest in various fields of application. For nonspherical particles, no analytic description of the absorption spectra according to the commonly used Mie theory is possible. In this work, we present a semi-empirical approach for the explanation of the optical spectra of shape anisotropic particles such as silver nanoprisms and gold nanorods. We found an interpretation of the optical absorption spectra which is based on a single-photon-single-electron transition. This model is in a better agreement with the basic assumptions of quantum mechanics than the electrodynamic model of a localized surface plasmon excitation. Based on microfluidically obtained Ag nanoprisms and Au nanorods with very high ensemble homogeneities, dependencies between the geometrical properties of the shape anisotropic noble metal nanoparticles and the spectral position of the longitudinal absorption mode could be derived, which show that the assumption of a composed relative permittivity and the inclusion of the Rydberg constant is sufficient to describe the optical properties of the shape anisotropic particles. Within the scope of the measuring accuracy, the calculations furthermore lead to the value of the refractive index of the particle-surrounding medium.

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Investigation of pH Effect on Gold Nanorod Synthesis

Cited by 43 publications

References 38 publications

Direct observation of single plasmonic metal nanoparticle reaction in microcolumn with chromatic‐aberration‐free LASER light‐sheet scattering imaging

Direct observation of single plasmonic metal nanoparticle reaction in microcolumn with chromatic‐aberration‐free LASER light‐sheet scattering imaging

Controlled synthesis of monodisperse gold nanorods with different aspect ratios in the presence of aromatic additives

Single-Photon-Single-Electron Transition for Interpretation of Optical Spectra of Nonspherical Metal Nanoparticles in Aqueous Colloidal Solutions

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