Limits...
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 room temperature of 25°C, using (8, 15) mA of currents with non-stirring condition.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4214825&req=5

Figure 3: UV–Vis absorbance spectroscopy (a), TEM images (b, b’), and PSD (c, c’) of Au NPs. Synthesized at room temperature of 25°C, using (8, 15) mA of currents with non-stirring condition.

Mentions: Obviously, by increasing the temperature, there are two opposite factors that affect the growth of Au NPs: one is due to the increase of the Au3+ ions concentration and another is due to the decrease of the residence time of Au NPs at the interfacial region. The former will do a favor to produce large Au NPs, whereas the latter will favor the small NPs production. The relative stronger effect of the increase of the Au3+ ions concentration ultimately results in more Au NPs with large size produced as shown in Figure 2b,b’ and c,c’, though it is not strong enough to change the most probable size of the Au NPs thus produced.Figure 3a shows the UV-Vis absorbance spectroscopy of Au colloids produced at the current of 8 mA and 15 mA by using the atmospheric microplasma electrochemistry. Both experiments were carried out at room temperature without any stirring. The blue shift of the UV-Vis absorption peak for the Au NPs produced at 15 mA indicates that the most probable size of nanoparticles fabricated at higher values of current is smaller.TEM images and PSD of the Au NPs produced at a current of 8 mA and 15 mA are given in Figure 3b,b’ and c,c’, respectively. The average size of the Au NPs produced at 8 mA is 32.78 nm, and that at 15 mA is 28.79 nm and it can be seen that that Au NPs produced at higher values of current have smaller average size. The results agree well with that given by UV-Vis absorbance spectroscopy. Both the results show that the Au NPs produced at the higher values of current have the smaller average size as compared to that produced at the lower values of current.


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 room temperature of 25°C, using (8, 15) mA of currents with non-stirring condition.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: UV–Vis absorbance spectroscopy (a), TEM images (b, b’), and PSD (c, c’) of Au NPs. Synthesized at room temperature of 25°C, using (8, 15) mA of currents with non-stirring condition.
Mentions: Obviously, by increasing the temperature, there are two opposite factors that affect the growth of Au NPs: one is due to the increase of the Au3+ ions concentration and another is due to the decrease of the residence time of Au NPs at the interfacial region. The former will do a favor to produce large Au NPs, whereas the latter will favor the small NPs production. The relative stronger effect of the increase of the Au3+ ions concentration ultimately results in more Au NPs with large size produced as shown in Figure 2b,b’ and c,c’, though it is not strong enough to change the most probable size of the Au NPs thus produced.Figure 3a shows the UV-Vis absorbance spectroscopy of Au colloids produced at the current of 8 mA and 15 mA by using the atmospheric microplasma electrochemistry. Both experiments were carried out at room temperature without any stirring. The blue shift of the UV-Vis absorption peak for the Au NPs produced at 15 mA indicates that the most probable size of nanoparticles fabricated at higher values of current is smaller.TEM images and PSD of the Au NPs produced at a current of 8 mA and 15 mA are given in Figure 3b,b’ and c,c’, respectively. The average size of the Au NPs produced at 8 mA is 32.78 nm, and that at 15 mA is 28.79 nm and it can be seen that that Au NPs produced at higher values of current have smaller average size. The results agree well with that given by UV-Vis absorbance spectroscopy. Both the results show that the Au NPs produced at the higher values of current have the smaller average size as compared to that produced at the lower values of current.

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.