In Situ Investigation of the Formation Kinematics of Plasma-Generated Silver Nanoparticles

Abstract

In this publication, it is shown how to synthesize silver nanoparticles from silver cations out of aqueous solutions by the use of an atmospheric pressure plasma source. The use of an atmospheric pressure plasma leads to a very fast reduction of silver ions in extensive solvent volumes. In order to investigate the nanoparticle synthesis process, ultraviolet/visible (UV/VIS) absorption spectra were recorded in situ. By using transmission electron microscopy and by the analysis of UV/VIS spectra, the kinetics of silver nanoparticle formation by plasma influence can be seen in more detail. For example, there are two different sections visible in the synthesis during the plasma exposure process. The first section of the synthesis is characterized by a linear formation of small spherical particles of nearly constant size. The second section is predominated by saturation effects. Here, particle faults are increasingly formed, induced by changes in the particle shape and the fusion of those particles. The plasma exposure time, therefore, determines the shape and size distribution of the nanoparticles.

Fabrication of Hollow Channels Surrounded by Gold Nanoparticles in Hydrogel by Femtosecond Laser Irradiation

“…In addition, the reduction of metal ions can be induced by a plasma produced by a focused laser pulse. Tasche et al discussed that the electrons at the boundary of the plasma and silver nitrate solution reduced the silver ions to create silver nanoparticles [ 24 ]. The gold nanoparticles in the structures formed in the present study were distributed to regions larger than the focal spot size of the laser pulse.…”

Nanomaterials in Cosmetics: Recent Updates

“…Gold [36][37][38][39][40][41][42][43][44][45][46] and silver nanoparticles [47][48][49][50][51][52], apart from the numerous applications that they have, also show antibacterial and antifungal properties [53]. Gold and silver nanoparticles are used in cosmetic products (Figure 2) such as deodorants and anti-aging creams.…”

Structural and Optical Sensing Properties of Nonthermal Atmospheric Plasma-Synthesized Polyethylene Glycol-Functionalized Gold Nanoparticles

“…The non-thermal plasma synthesis of metal nanostructures is an alternative green synthesis approach that has substantial advantages compared to chemical synthesis [ 14 , 15 , 16 , 17 ]. This method uses non-thermal atmospheric pressure plasmas under ambient conditions and produces large amounts of reactive oxygen and nitrogen species, excited metastable species, free electrons, and charged particles [ 18 ].…”