Atmospheric-Pressure Pulsed Discharge Plasma in a Slug Flow Reactor System for the Synthesis of Gold Nanoparticles

Motoki Yamada; Wahyudiono; Siti Machmudah; Hideki Kanda; Yaping Zhao; Motonobu Goto

doi:10.1021/acsomega.0c02217

Atmospheric-Pressure Pulsed Discharge Plasma in a Slug Flow Reactor System for the Synthesis of Gold Nanoparticles

ACS Omega. 2020 Jul 9;5(28):17679-17685. doi: 10.1021/acsomega.0c02217. eCollection 2020 Jul 21.

Authors

Motoki Yamada¹, Wahyudiono¹, Siti Machmudah², Hideki Kanda¹, Yaping Zhao³, Motonobu Goto¹

Affiliations

¹ Department of Materials Process Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
² Department of Chemical Engineering, Sepuluh Nopember Institute of Technology, Kampus ITS Sukolilo, Surabaya 60111, Indonesia.
³ School of Chemistry & Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Abstract

Gold nanoparticle (AuNP) formation by applying pulsed discharge plasma in the slug flow reactor system was demonstrated. Experiments were carried out continuously at room temperature. The argon gas as a gas phase and the hydrogen tetrachloroaurate(III) tetra hydrate solution containing lysine as a liquid phase simultaneously flowed in the slug flow reactor system. The flow rates of the feed solution and argon gas were kept at 1.5 and 0.2 mL/min, respectively. To generate discharge plasma, the AC power supply with a bipolar pulsed output at 10 kV was applied. The purple color solution product was obtained, and the ultraviolet-visible (UV-vis) spectrophotometer showed that this possessed the absorption light from 510 to 550 nm associated with the existence of gold nanoparticles in each collected sample. Transmission electron microscopy (TEM) revealed that the lysine-capped AuNPs were produced in a spherical morphology and dispersed in aqueous solution products with a diameter of less than 20 nm.