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Effect of experimental conditions on size control of Au nanoparticles synthesized by atmospheric microplasma electrochemistry.

Huang X, Li Y, Zhong X - Nanoscale Res Lett (2014)

Bottom Line: The Au NPs often with small size were synthesized as a result of stirring.The production rate, the electrostatic repulsion, and the residence time of the Au NPs at the interfacial region play an important role in the growth of Au NPs.The results shed light upon the roadmap to control the size and particle size distribution (PSD) of Au NPs synthesized by atmospheric microplasma electrochemistry.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Advanced Optical Communication Systems and Networks, Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

ABSTRACT
Atmospheric microplasma electrochemistry was utilized to synthesize Au nanoparticles (NPs). The synthesized Au NPs were investigated as a function of reduction current, solution temperature, and stirring (or not) by using ultraviolet-visible (UV-Vis) absorbance and transmission electron microscopy (TEM). It was illustrated that high current promoted the growth of Au NPs with small size, and more Au NPs with large size were synthesized as a rise of temperature. The Au NPs often with small size were synthesized as a result of stirring. The production rate, the electrostatic repulsion, and the residence time of the Au NPs at the interfacial region play an important role in the growth of Au NPs. The results shed light upon the roadmap to control the size and particle size distribution (PSD) of Au NPs synthesized by atmospheric microplasma electrochemistry.

No MeSH data available.


Schematic of deterministic processes for atmospheric microplasma-assisted synthesis of Au nanoparticles.
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Figure 5: Schematic of deterministic processes for atmospheric microplasma-assisted synthesis of Au nanoparticles.

Mentions: In this paper, the size of Au NPs synthesized by the atmospheric microplasma electrochemistry was studied as a function of solution temperature, current, and stirring, and the main results are summarized in FigureĀ 5. As the temperature is raised, the increase in the growth rate of Au NPs caused by concentration of Au3+ ion plays a relatively stronger effect on the size and the size distribution of Au NPs compared to the reduction in the residence time of Au NPs at the interfacial region, which is caused by the increase in the diffusion coefficient. As a result of the increase of the current, more electrons are injected into the solution to reduce the Au3+ and charge the produced Au NPs, and more Au NPs with the relatively smaller size are produced under the effect of the electrostatic repulsion of the charged Au NPs. Stirring will decrease the residence time of Au NPs at the interfacial region and lead to the production of Au NPs with small and uniform size. The production rate, the electrostatic repulsion, and the residence time of Au NPs at interfacial region are expected to be the main factors that affect the size and size distribution of Au NPs. Further investigations are under way.


Effect of experimental conditions on size control of Au nanoparticles synthesized by atmospheric microplasma electrochemistry.

Huang X, Li Y, Zhong X - Nanoscale Res Lett (2014)

Schematic of deterministic processes for atmospheric microplasma-assisted synthesis of Au nanoparticles.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4214825&req=5

Figure 5: Schematic of deterministic processes for atmospheric microplasma-assisted synthesis of Au nanoparticles.
Mentions: In this paper, the size of Au NPs synthesized by the atmospheric microplasma electrochemistry was studied as a function of solution temperature, current, and stirring, and the main results are summarized in FigureĀ 5. As the temperature is raised, the increase in the growth rate of Au NPs caused by concentration of Au3+ ion plays a relatively stronger effect on the size and the size distribution of Au NPs compared to the reduction in the residence time of Au NPs at the interfacial region, which is caused by the increase in the diffusion coefficient. As a result of the increase of the current, more electrons are injected into the solution to reduce the Au3+ and charge the produced Au NPs, and more Au NPs with the relatively smaller size are produced under the effect of the electrostatic repulsion of the charged Au NPs. Stirring will decrease the residence time of Au NPs at the interfacial region and lead to the production of Au NPs with small and uniform size. The production rate, the electrostatic repulsion, and the residence time of Au NPs at interfacial region are expected to be the main factors that affect the size and size distribution of Au NPs. Further investigations are under way.

Bottom Line: The Au NPs often with small size were synthesized as a result of stirring.The production rate, the electrostatic repulsion, and the residence time of the Au NPs at the interfacial region play an important role in the growth of Au NPs.The results shed light upon the roadmap to control the size and particle size distribution (PSD) of Au NPs synthesized by atmospheric microplasma electrochemistry.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Advanced Optical Communication Systems and Networks, Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

ABSTRACT
Atmospheric microplasma electrochemistry was utilized to synthesize Au nanoparticles (NPs). The synthesized Au NPs were investigated as a function of reduction current, solution temperature, and stirring (or not) by using ultraviolet-visible (UV-Vis) absorbance and transmission electron microscopy (TEM). It was illustrated that high current promoted the growth of Au NPs with small size, and more Au NPs with large size were synthesized as a rise of temperature. The Au NPs often with small size were synthesized as a result of stirring. The production rate, the electrostatic repulsion, and the residence time of the Au NPs at the interfacial region play an important role in the growth of Au NPs. The results shed light upon the roadmap to control the size and particle size distribution (PSD) of Au NPs synthesized by atmospheric microplasma electrochemistry.

No MeSH data available.