Nanoparticles are the structures in which at least one of the dimensions is less than 100 nm [1]. The enormous interest in the practical application of metallic nanoparticles raises no less interest in their methods of synthesis, allowing the preparation of controlled nanostructures with the given size and shape. In view of catalytic and  therapeutic properties [2], the greatest interest is observed for gold nanoparticles (AuNPs).

Gold nanoparticles (AuNPs) were prepared by newly plasma method, i.e., direct current atmospheric pressure glow microdischarge (dc-µAPGD), generated between miniature flow argon microjet and flowing liquid cathode, using chloroauric acid (HAuCl₄) as AuNPs precursor. The plasma reactor was presented on the  Fig. 1. The addition of natural capping agents such as: gelatine and fructose to solution containing gold precursor onto AuNPs production were investigated. The optical properties, morphology and size of AuNPs were determined. The Localized Surface Plasmon Resonance (LSPR) band was observed in the UV/Vis absorption spectrum for different concentrations of the precursor in initial solution. The position of the LSPR band indicated production of AuNPs. The size of AuNPs was obtained using dynamic light scattering (DLS) method.

Literature:

[1] Toshima N., Yonezawa T.: Biometallic nano-particles-novel materials for chemical and physical applications. New Journal of Chemistry 1998, 22, 1179-1201.

[2] Marzari G., Morales G., Moreno M., Garcia-Guttierez D., Fungo F.: The optoelectronic behavior of carbon nanoparticles: Evidence of the importance of the outer carbon shell. Nanoscale 2013, 5, 7977-7983

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1. Preparation of silver sols by reduction of  silver bromide nanocrystals with the use of different reducing agents