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Current Nanoscience


ISSN (Print): 1573-4137
ISSN (Online): 1875-6786

Research Article

Characteristics of Nano-metal Colloid Prepared by Electrical Spark Discharge Method

Author(s): Kuo-Hsiung Tseng* and Meng-Yun Chung

Volume 16, Issue 6, 2020

Page: [890 - 911] Pages: 22

DOI: 10.2174/1573413715666191114124120

open access plus


Background: This study used Electrical Spark Discharge Method (ESDM) to fabricate the nano-Au, nano-Ag and nano-Cu colloid. The spark wears down the surface of the electrodes and gets nano-metal particles at standard temperature and pressure and without adding any other chemical materials in the deionized water.

Methods: The nano-metal particles are examined by UV-Visible Spectroscopy, Zetasizer, Transmission Electron Microscope, and Energy Dispersive X-ray Analysis and are proven to be nano-metal colloid. Under the comparison of different parameters (discharge pulse width, HV, Ip), the size of nano-metal particles increases with the level of Ip.

Results: Under the experiment of light or dark, most of the Absorbance of the nano-Au and nano-Ag colloid is higher than that of the environment under strong light irradiation as long as it is prepared in a pure black environment. The nano-Au and nano-Ag colloid prepared by ESDM have a zeta potential exceeding the absolute value of 30 mV, no matter which parameter is applied or whether there is illumination or not.

Conclusion: It represents a good suspension stability of the nano-Au and nano-Ag colloid, but the nano-Cu colloid does not have this feature. The suspension stability is not good.

Keywords: Electrical spark discharge method, nano-au colloid, nano-ag colloid, nano-cu colloid, illumination, absorbance.

Graphical Abstract

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