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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.


UV–Vis absorbance spectroscopy (a), TEM images (b, b’), and PSD (c, c’) of Au NPs. Synthesized at temperatures of 25°C and 70°C, using 8 mA of current with non-stirring condition.
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Figure 2: UV–Vis absorbance spectroscopy (a), TEM images (b, b’), and PSD (c, c’) of Au NPs. Synthesized at temperatures of 25°C and 70°C, using 8 mA of current with non-stirring condition.

Mentions: The UV-Vis absorbance spectroscopy of Au particles at room temperature (25°C) and high temperature (70°C) are shown in Figure 2a. Both experiments without stirring were carried out at a current of 8 mA. The UV-Vis absorbance spectroscopies show that the most probable size of Au NPs produced at different temperature is nearly the same since both of the absorption peaks are around 530 nm. The absorbance curve of Au NPs produced at 70°C shows a little upward trend at the long wavelength, reveals that the higher temperature enhances the growth of the larger Au NPs; nevertheless, the influence of the temperature is not large enough so that it cannot make the peak of the absorbance curve red-shifted.TEM images and PSD of the Au NPs produced at temperature of 25°C and 70°C are shown in Figure 2b,b’ and c,c’, respectively. The average size (AVS) is 32.78 nm for the Au NPs produced at 25°C and 36.87 nm for the Au NPs produced at 70°C. Although the AVS of Au particles fabricated at 70°C is larger, the most probable sizes of Au NPs produced at both temperatures are nearly the same. The result agrees well with that given by UV-Vis absorbance (Figure 2a).


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)

UV–Vis absorbance spectroscopy (a), TEM images (b, b’), and PSD (c, c’) of Au NPs. Synthesized at temperatures of 25°C and 70°C, using 8 mA of current with non-stirring condition.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: UV–Vis absorbance spectroscopy (a), TEM images (b, b’), and PSD (c, c’) of Au NPs. Synthesized at temperatures of 25°C and 70°C, using 8 mA of current with non-stirring condition.
Mentions: The UV-Vis absorbance spectroscopy of Au particles at room temperature (25°C) and high temperature (70°C) are shown in Figure 2a. Both experiments without stirring were carried out at a current of 8 mA. The UV-Vis absorbance spectroscopies show that the most probable size of Au NPs produced at different temperature is nearly the same since both of the absorption peaks are around 530 nm. The absorbance curve of Au NPs produced at 70°C shows a little upward trend at the long wavelength, reveals that the higher temperature enhances the growth of the larger Au NPs; nevertheless, the influence of the temperature is not large enough so that it cannot make the peak of the absorbance curve red-shifted.TEM images and PSD of the Au NPs produced at temperature of 25°C and 70°C are shown in Figure 2b,b’ and c,c’, respectively. The average size (AVS) is 32.78 nm for the Au NPs produced at 25°C and 36.87 nm for the Au NPs produced at 70°C. Although the AVS of Au particles fabricated at 70°C is larger, the most probable sizes of Au NPs produced at both temperatures are nearly the same. The result agrees well with that given by UV-Vis absorbance (Figure 2a).

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.