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


Kuo-Hsiung Tseng* and Meng-Yun Chung   Pages 1 - 22 ( 22 )


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.

Method: 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 parameters is applied or whether there is illumination or not. 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.


Electrical Spark Discharge Method, Nano-Au Colloid, Nano-Ag Colloid, Nano-Cu Colloid, Illumination, UV-Visible Spectroscopy


Department of Electrical Engineering, National Taipei University of Technology, Department of Electrical Engineering, National Taipei University of Technology

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