Preparation of Cu nanoparticle colloid from a Cu ion solution by using protein surfactant
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.72
Preparation of Cu nanoparticle colloid from a Cu ion solution by using protein surfactant 1
M.SEKIGUCHI, 1K.OIKAWA, 2M.NAKAHARA, 2Y.INABA, 1,2 T. MAEDA, A.MATSUI, and 1,2H.ISHIZAKI
1,2
1
Graduate School of Engineering, Information Systems Saitama Institute of Technology
2
Department of Information Systems, Saitama Institute of Technology
ABSTRACT
In this paper, a colloidal solution of copper nanoparticles was prepared from a Cu ion aqueous solution with the protein casein surfactant by a liquid phase reduction method at low temperature below 373K. For the casein concentration ranging from 6g/L to 75g/L, the formation of copper nanoparticle colloid were observed. As a result, the peak was observed at the ranging of 450 to 650 nm corresponding to the copper nanoparticle colloid plasmon absorption. As the surfactant concentration increases, the absorption spectrum tends to blueshift and the particle diameter decreases. Thus, it indicated that the optical property and particle diameter of copper nanoparticle colloidal solution will be controlled by the protein casein surfactant concentration.
INTRODUCTION: Recently, copper nanoparticles have attracted attention in various fields such as conductive inks and catalysts as materials having higher conductivity and migration resistance than other metal nanoparticles [1]. And since this copper nanoparticle ink solution is inexpensive compared to gold and silver, there is an advantage that devises can be developed in large quantities by using this copper nanoparticle ink solution [2]. However, copper nanoparticles have problems such as oxidation resistance of nanoparticles, uniformity of particle diameter and the aggregation etc. In particular, the smaller diameter for the nanoparticles gives the high oxidation rate. Therefore, this oxidation is protected by coating the surface of copper nanoparticles with other surfactant.
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In this research, the oxidation of nanoparticles can be improved by adsorbing the protein casein on the surface of copper nanoparticles. Also, if growth of copper nanoparticles can be suppressed using the protein casein, the very small copper nanoparticles can be produced. As a result, production of electronic materials using copper nanoparticles having small size of nanoparticles and high oxidation resistance is expected. In the liquid phase reduction method, ultrapure water is used as a solvent. Water is a part of nature and uses harmless solvents, which leads to lower environmental impact and lower costs. And in order to obtain conductive Cu thin film on the paper by the inkjet printer, the copper metal will be deposited by the chemical decomposition reaction of casein surfactant and enzyme. Thus, the protein casein agent will act as the
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