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Journal of Nanotechnology
Volume 2012 (2012), Article ID 467812, 4 pages
Research Article

Effect of Conductivity of the Aqueous Solution on the Size of Printable Nanoparticle

1Department of Bio-Chemical Engineering, SeoKyeong University, Seoul 136-704, Republic of Korea
2Department of Metallurgical and Materials Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA
3Department of Electronics Engineering, SeoKyeong University, Seoul 136-704, Republic of Korea

Received 9 December 2011; Accepted 2 April 2012

Academic Editor: In-Kyu You

Copyright © 2012 Mi-Hyun Oh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Direct writing technology using nano/microsize particles in aqueous solution is currently one of the leading candidates to bring a substantial advancement to the technical arena. However, little is known about an effect of conductivity of the solution including metal ions on nanoparticle size for the direct writing technology. It is believed that conductivity of solution can influence the size of particles in reducing environmental of aqueous solutions. In this study parameters which affect electric conductivity in solution were characterized by changing concentration of copper ion, concentration of surfactants, and anion of metal compounds. The mobility of ion in aqueous media with respect to copper ion concentration was the most pronounced factor to control the size of created copper nanometals in water. However, due to the high reactivity on large surface area, the nanocopper metal was oxidized in water. The electric conductivity varied in the range of 7 to 360 mS/cm when Cu(NO3)23H2O dissolved in water from 0.03–3.0 mol/dm3. In this condition, the size of nano particles can vary from 10 to 500 nm. Various concentrations of surfactants and two anion Cu compounds used to vary the conductivity of the solution to verify the effect of electric conductivity of solution on the particle size. Decreasing the conductivity had a corresponding effect on the particle size. The electric conductivity was decreased from 67 to 56 mS/cm by adding surfactant from 0.1 to 0.5 mol/dm3 consequently, the particle sizes were decreased from 89 to 21 nm. Copper nitrate and copper chloride were used to verify the anion effect on electrical conductivity and particle sizes. This effect was not dependent on the kind of ions chosen to change the conductivity. However, when Cu(NO3)23H2O was used, the size of the particles was 89 nm, while it was 91 nm when CuCl22H2O was used.