In situ UV–vis investigation of growth of gold nanoparticles prepared by solution plasma sputtering in NaCl solution

Mizutani, Tadashi; Ogawa, Soichi; Murai, Takaaki; Nameki, H.; Yoshida, Tomoko; Yagi, Shunsuke

doi:10.1016/j.apsusc.2015.04.139

Cited by 19 publications

(14 citation statements)

References 13 publications

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“…The average particle diameter after 36 days was estimated to be 13 nm, and the particle diameter distribution was approximately Gaussian. A study reported that when AuNPs were prepared in a NaCl aqueous solution using the solution‐plasma method, particles with 2.2‐nm diameter appeared first via the plasma process and subsequently enlarged until they reached an equilibrium size . The particle growth occurs via a phenomenon called Ostwald ripening, by which the more soluble, smaller particles dissolve and larger particles are reconstructed .…”

Section: Resultsmentioning

confidence: 70%

“…A AuNP colloidal solution was prepared in a 5 mM CsCl aqueous solution (CsCl, ≥99.0%, Wako) in water (≥18 MΩ cm, Milli‐Q) using the solution‐plasma method . Two Au rods (99.95%, 1.0‐mm diameter, Nilaco) were set in an insulating tube (SSA‐S, outer diameter: 2 mm, inner diameter: 1 mm, Nikkato) with a 0.7‐mm gap and placed in a beaker containing a 200 mL CsCl aqueous solution.…”

Section: Experimental Methods and Materialsmentioning

confidence: 70%

“…However, to facilitate the use of AuNPs for various potential applications, the prepared AuNPs should be purified . The solution‐plasma method has been proposed as a new method for preparing metal nanoparticles in a solution . This method requires only metal rods, a solvent, and a small amount of an electrolyte.…”

Section: Introductionmentioning

confidence: 99%

“…This method requires only metal rods, a solvent, and a small amount of an electrolyte. Specifically, AuNPs have been prepared using Au rods and an aqueous alkali metal chloride solution . Since relatively few reagents are used in this process, the AuNPs are expected to have clean surfaces compared with that prepared using general method.…”

Section: Introductionmentioning

confidence: 99%

“…When AuNPs are prepared in a NaCl aqueous solution using the solution‐plasma method, small particles of 2.2‐nm diameter are first formed via the plasma phase. The particles then rapidly increase in diameter in the solution via a process called Ostwald ripening, approaching an equilibrium size . X‐ray photoelectron spectroscopy with synchrotron radiation (SR‐XPS) can be used to determine if the alkali metal and/or Cl was adsorbed on the AuNP surface during the particle growth because the detection depth can be controlled by varying the energy of the incident X‐ray ( hν ) .…”

Section: Introductionmentioning

confidence: 99%

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Surface chemical states of gold nanoparticles prepared using the solution‐plasma method in a CsCl aqueous solution

Tsukada

Yoshida

Ogawa

et al. 2018

Surface & Interface Analysis

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In this study, gold nanoparticles (AuNPs) prepared in a 5 mM CsCl aqueous solution using the solution‐plasma method are characterized via transmission electron microscopy (TEM) and X‐ray photoelectron spectroscopy with synchrotron radiation (SR‐XPS). The particle diameter is measured over the process time via TEM. During the solution‐plasma process, small particles of 2.1 to 2.2‐nm diameter are generated in the CsCl aqueous solution; these particles then enlarge via Ostwald ripening over time until they reach an equilibrium size of ~13 nm after 36 days. In addition, the surface chemical states of the AuNPs are characterized at different depths via SR‐XPS. The SR‐XPS measurements obtained using incident X‐ray energy (hν) of 945.0 eV revealed that Cs─Au, Cl─Au, and Cs─Cl─Au bonds are present 1.2 nm below the surface. The measurements obtained at an incident X‐ray energy of 2515.0 eV showed that Cs─Cl─Au bonding is also present 2.5 nm below the surface, indicating that Cs and Cl strongly interact with Au. The TEM and SR‐XPS measurements revealed that 2 processes occur cyclically during the growth process via Ostwald ripening: (i) the Cs and Cl in the aqueous solution adsorb on the AuNP surface and (ii) Au atoms subsequently bond to the AuNPs surface.

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Section: Resultsmentioning

confidence: 70%

Section: Experimental Methods and Materialsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Surface chemical states of gold nanoparticles prepared using the solution‐plasma method in a CsCl aqueous solution

Tsukada

Yoshida

Ogawa

et al. 2018

Surface & Interface Analysis

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Importance of Monitoring the Synthesis of Light‐Interacting Nanoparticles – A Review on In Situ, Ex Situ, and Online Time‐Resolved Studies

Pinho

Zhang

Hoye

et al. 2022

Advanced Optical Materials

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Reducing the dimensionality of materials from bulk thin films and single crystals to nanocrystals (NCs) and quantum dots This review paper analyzes the importance of monitoring the synthesis of plasmonic and optoelectronic materials to provide a mechanistic understanding of their nucleatiçon and growth, as well as crucial kinetic insights to enable their future development. Light-interacting nanoparticles present strong size-property relationships, such that size control is at the core of any synthetic development. However, conventional ex situ characterization of these materials has heavily limited their development to simple trial-and-error approaches. Over the last decade, the development of in situ and online characterization capabilities has transformed the understanding of mechanistic models. In addition, time-resolved data are able to reveal the step rate, even for phenomena taking place in the microsecond timescale (i.e., nucleation), thanks to the use of micro-flow-reactors. However, the literature contains a few disagreements and inaccuracies, which are considered to be due to the general lack of attention and control on mixing (relevant when mixing time is comparable to the reaction time), and the presence of additives during synthesis (e.g., stabilizers). Finally, it is believed that recent in situ monitoring development coupled with reactor design brings unique opportunities to not only synthesize nanoparticles in a reproducible and controllable manner, but also gives data-rich approaches for self-regulated and automated systems.

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In Situ X-Ray Absorption Spectroscopy to Study Growth of Nanoparticles

Nayak

Jha

Bhattacharyya

2018

In-Situ Characterization Techniques for Nanomaterials

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In situ UV–vis investigation of growth of gold nanoparticles prepared by solution plasma sputtering in NaCl solution

Cited by 19 publications

References 13 publications

Surface chemical states of gold nanoparticles prepared using the solution‐plasma method in a CsCl aqueous solution

Surface chemical states of gold nanoparticles prepared using the solution‐plasma method in a CsCl aqueous solution

Importance of Monitoring the Synthesis of Light‐Interacting Nanoparticles – A Review on In Situ, Ex Situ, and Online Time‐Resolved Studies

In Situ X-Ray Absorption Spectroscopy to Study Growth of Nanoparticles

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