Reduction Kinetics of Gold Nanoparticles Synthesis via Plasma Discharge in Water
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In this work, we describe the reduction kinetics of gold nanoparticles synthesized by plasma discharge in aqueous solutions with varied voltages and precursor (HAuCl4) concentrations. The reduction rate of [AuCl4]– was determined by introducing NaBr to the gold colloidal solution synthesized by plasma discharge, serving as a catalyst in the reduction process. We observed that [AuCl4]– was completely reduced when its characteristic absorption peak at 380 nm disappeared, indicating the absence of [AuCl4]– for ligand exchange with NaBr. The reduction rate notably increased with the rise in discharge voltage, attributable to the intensified plasma generated by ionization and excitation, which in turn accelerated the reduction kinetics. Regarding precursor concentration, a lower concentration was found to retard the reduction reaction, significantly influencing the reduction kinetics due to the presence of active H+ and H radicals. Therefore, the production of strong plasma with high plasma density was observed to enhance the reduction kinetics, as evidenced by optical emission spectroscopy.
Abstract
In this work, we describe the reduction kinetics of gold nanoparticles synthesized by plasma discharge in aqueous solutions with varied voltages and precursor (HAuCl4) concentrations. The reduction rate of [AuCl4]– was determined by introducing NaBr to the gold colloidal solution synthesized by plasma discharge, serving as a catalyst in the reduction process. We observed that [AuCl4]– was completely reduced when its characteristic absorption peak at 380 nm disappeared, indicating the absence of [AuCl4]– for ligand exchange with NaBr. The reduction rate notably increased with the rise in discharge voltage, attributable to the intensified plasma generated by ionization and excitation, which in turn accelerated the reduction kinetics. Regarding precursor concentration, a lower concentration was found to retard the reduction reaction, significantly influencing the reduction kinetics due to the presence of active H+ and H radicals. Therefore, the production of strong plasma with high plasma density was observed to enhance the reduction kinetics, as evidenced by optical emission spectroscopy.
참고문헌 (12)
- T. Patil, "Gold nanoparticles: synthesis methods, functionalization and Biological Applications", Journal of Cluster Science, 34, pp.705~725 (2023)
- P. G. Jamkhande, "Metal nanoparticles synthesis: An overview on methods of preparation, advantages and disadvantages, and applications", Journal of Drug Delivery Science and Technology, 53, pp.101174~ (2019)
- S. M. Kim, "Effects of PVP and KCl concentrations on the synthesis of gold nanoparticles using a solution plasma processing", Materials Letters, 62, pp.4354~4356 (2008)
- S. M. Kim, "The plasma-induced formation of silver nanocrystals in aqueous solution and their catalytic activity for oxygen reduction", Nanotechnology, 29 (2018)
- Y. K. Heo, "Effects of discharge duration on the size and shape of gold nanoparticles synthesized using solution plasma processing", Physica Scripta, T139 (2010)
- Y. G. Jo, "Composition-tuned porous Pd-Ag bimetallic dendrites for the enhancement of ethanol oxidation reactions", Journal of Alloys and Compounds, 688, pp.447~453 (2016)
- S. M. Kim, "The composition-controlled synthesis of PtAg bimetallic nanochains for catalytic methanol oxidation", Electrochimica Acta, 174, pp.1244~1252 (2015)
- S. M. Kim, "Formation of nitrogen-doped onion-like carbon as catalyst support for enhanced oxygen reduction activity and durability", Carbon, 101, pp.420~430 (2016)
- V. Amendola, "Size Evaluation of Gold Nanoparticles by UVvis Spectroscopy", The Journal of Physical Chemistry C, 113, pp.4277~4285 (2009)
- A. J. Canumalla, "Redox and ligand exchange reactions of potential gold(I)and gold(III)-cyanide metabolites under biomimetic conditions", Journal of Inorganic Biochemistry, 85, pp.67~76 (2001)
- M. Bechelany, "Synthesis mechanisms of organized gold nanoparticles : influence of annealing temperature and atmosphere", Crystal Growth & Design, 10, pp.587~596 (2010)
- M. A. Gigosos, "Computer simulated Balmeralpha, -beta and -gamma Stark line profiles for non-equilibrium plasmas diagnostics", Spectrochimica Acta Part B, 58, pp.1489~1504 (2003)