Crystal Growth of Thiol-Stabilized Gold Nanoparticles by Heat-Induced Coalescence

Moon, Seong‐Yong; Tanaka, Shun–ichiro; Sekino, Tohru

doi:10.1007/s11671-010-9565-6

Cited by 35 publications

(22 citation statements)

References 41 publications

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“…A second key point for the development of contacts could be the surface mobility of gold atoms, which might partially cause a reorganization of the domains after linking (which however we are unable to exclude) ,…”

Section: Resultsmentioning

confidence: 94%

Spectroelectrochemical Investigation of the Charge Carrier Kinetics of Gold‐Decorated Cadmium Chalcogenide Nanorods

et al. 2017

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The interfacial transfer of charge carriers across the semiconductor nanoparticle/electrolyte boundary is an elementary process for applications such as photoelectrochemical sensing and photocatalysis. This mechanism is investigated for systems based on complex shaped semiconductor and metal-semiconductor nano-heteroparticles. In the present work the influence of the presence of a CdSe domain within the CdS nanorod as well as the influence of gold domain decoration is investigated spectroelectrochemically. Therefore, the mentioned nanoparticles are linked to transparent indium tin oxide (ITO) glass slides via (3-mercaptopropyl)trimethoxysilane (MPTMS). This preparation yields sub-monolayers of the particles. External photocurrent quantum efficiency spectra are measured in the range from l = 350-650 nm. Intensity-modulated photocurrent spectroscopy (IMPS) and electrochemical impedance spectroscopy (EIS) measurements are applied to the samples in order to reveal and explain the differences of the electrochemical kinetics between the four different particle types (CdS, CdSe/ CdS, CdSÀAu, and CdSe/CdSÀAu nanorods). We demonstrate that the presence of gold domains affects the carrier dynamics of various involved processes. An equivalent circuit model is derived and fitted to the impedance data to explain changes of the kinetics in the system.

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Section: Resultsmentioning

confidence: 94%

Spectroelectrochemical Investigation of the Charge Carrier Kinetics of Gold‐Decorated Cadmium Chalcogenide Nanorods

et al. 2017

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“…2,3 Sintering process of nanoparticles represents an interesting and important topic in evaluating stability of colloidal nanoparticles, and the corresponding knowledge can help us develop methods to prevent sintering and thus improve stability of the nanoparticles. [9][10][11][12][13] The sublimation of Ag nanoparticles with size over 20 nm was investigated by in-situ TEM under elevated temperatures, indicating the dependence on facets. The electron beam dose effects on sintering of passivated Au nanoparticles driven by surface atom diffusion rather than Ostwald ripening.…”

Section: Introductionmentioning

confidence: 99%

Electron beam induced evolution in Au, Ag, and interfaced heterogeneous Au/Ag nanoparticles

Liu

Sun

2015

Nanoscale

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A sintering process of nanoparticles made of Ag, Au, and interfaced Ag/Au heterodimers was investigated by in situ transmission electron microscopy at room temperature. Such a process is driven by the illumination of a high-energy electron beam accelerated at 200 kV that promotes atom diffusion in the nanoparticles that are in physical contact. Upon electron illumination, adjacent Au nanoparticles gradually merge together to form a larger particle along with the reduction of the surface area despite the fact that orientated attachment is not observed. According to the detailed analysis of the size change of the particles and the contact area, it was found that the nanoparticle fusion process is significantly different from the well-established thermal diffusion mechanism. In addition to the similar fusion process of Au nanoparticles, Ag nanoparticles undergo apparent sublimation induced by knock on damage because the transferred energy from the electron beam to nanoparticles is higher than the surface binding energy of Ag atoms when the electron scattering angle is larger than 112°. The particles with a smaller size diffuse faster. Surface diffusion dominates at the beginning of the fusion process followed by slower lattice diffusion. Electron beam illumination can transform the interfaced Au/Ag dimers to Au@Ag core-shell particles followed by a slow removal of the Ag shells. This process under normal electron beam illumination is a lot faster than the thermally driven process. Both diffusion and sublimation of Ag atoms are dependent on the intensity of the electron beam, i.e., a higher beam intensity is favorable to accelerate both the processes.

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“…The SEM image in Fig 5 , taken at 50k x and 65k x magnification, shows the detailed inner structure of GNRDS aggregates formed upon evaporative self-assembly and the thermal process in the presence of the removable silicon support. It has been previously reported that thermal treatment of thiol-capped GNRDs can lead to coalescence of the GNRDs in ordered aggregates [ 70 ] as the thiol-alkyl chains behave more as a liquid than a solid. [ 71 ] Therefore, we propose that under such conditions the thiol-capped gold nanorods are likely to retain a certain degree of their colloidal properties and are non-isotropically distributed before being bound to the surface of a silicon substrate.…”

Section: Resultsmentioning

confidence: 99%

Linear self-assembly and grafting of gold nanorods into arrayed micrometer-long nanowires on a silicon wafer via a combined top-down/bottom-up approach

Lestini¹,

Andrei²,

Zerulla³

2018

PLoS ONE

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Macroscopically long wire-like arrangements of gold nanoparticles were obtained by controlled evaporation and partial coalescence of an aqueous colloidal solution of capped CTAB-Au nanorods onto a functionalised 3-mercaptopropyl trimethoxysilane (MPTMS) silicon substrate, using a removable, silicon wafer with a hydrophobic surface that serves as a “handrail” for the initial nanorods’ linear self-assembly. The wire-like structures display a quasi-continuous pattern by thermal annealing of the gold nanorods when the solvent (i.e. water) is evaporated at temperatures rising from 20°C to 140°C. Formation of both single and self-replicating parallel 1D-superstructures consisting of two or even three wires is observed and explained under such conditions.

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Crystal Growth of Thiol-Stabilized Gold Nanoparticles by Heat-Induced Coalescence

Cited by 35 publications

References 41 publications

Spectroelectrochemical Investigation of the Charge Carrier Kinetics of Gold‐Decorated Cadmium Chalcogenide Nanorods

Spectroelectrochemical Investigation of the Charge Carrier Kinetics of Gold‐Decorated Cadmium Chalcogenide Nanorods

Electron beam induced evolution in Au, Ag, and interfaced heterogeneous Au/Ag nanoparticles

Linear self-assembly and grafting of gold nanorods into arrayed micrometer-long nanowires on a silicon wafer via a combined top-down/bottom-up approach

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