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

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.

Color‐Tunable Eu3+ and Tb3+ Co‐Doped Nanophosphors Synthesis by Plasma‐Assisted Method

“…This technique mainly consists of two steps: (1) deposition of rare earth hydroxides through plasma‐electrochemical reactions; (2) decomposition of these rare earth hydroxides to form oxide derivatives by a calcination process. Overall, it is a facile bottom‐up approach to produce rare earth oxides in a mild condition, without using toxic chemicals, vigorous hydrolyzing reactions as well as complex pre/post treatment procedures . Based on the previous research, in the present study we extend this concept for preparing Eu 3+ /Tb 3+ single‐doped and co‐doped Y 2 O 3 nanophosphors, in which their photoluminescence properties can be tuned to a large extent by adjusting the concentration ratios of dopants.…”

Size-controlled synthesis of gold nanoparticles by a novel atmospheric pressure glow discharge system with a metallic pin electrode and a flowing liquid electrode

“…1,2,[8][9][10][11][12][13][14][15][16][17][18][19][20] Higher discharge currents, e.g. 8, 21 10, 22 13, 23,24 and 15 mA, 21 are also used. The sustaining voltages change from 290 to 450 V, 12,17,23,24 but in general they are not higher than 800-2000 V. 1,2,8,9,[13][14][15]22 The rapid and single-step production of the metallic NPs in the solutions is possible under ambient conditions because highenergy electrons from the discharge reach the surface of the liquid and, depending on their kinetic energy, participate in forming the various species, e.g.…”

“…a graphite rod, 1,8,9,[13][14][15]17 Pt foil, 2,10-12,16,21,23,24 a stainless-steel (SS) rod, 8 a SS disk, 22 or a Ni wire. 8 To sustain the gaseous jet, SS, 1,2,[8][9][10][11][12][13][16][17][18][19][20][21][22] Cu, 6,23,24 or Ni 14,15 capillary tubes are used and Ar, 1,6,[10][11][12]14,15,23,24 He, 2,8,9,13,[16][17][18][19][20][21] or He mixed with H 2 (ref. 22) are passed through the tubes at a relatively low ow rate, i.e.…”

Predictor Packing in Developing Unprecedented Shaped Colloidal Particles

“…Mainly, four approaches remained under operation: (1) DC plasma discharge in contact to liquid [26][27][28][29], (2) DC glow discharge plasma in contact to liquid [30], (3) pulse plasma discharge inside the liquid [31][32][33][34][35][36], and (4) gas-liquid interface discharge [37]. Hydrogen peroxide was the most probable reaction mechanism to synthesize gold nanoparticles [26][27][28][29].…”