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연구논문초록(’81-’90) : 아연 - 니켈의 합금도금 기구에 관한 연구
최영식,두석광,손헌준,강탁 한국부식학회 1991 Corrosion Science and Technology Vol.20 No.1
The anomalous codeposition of Ni-Zn alloy on nickel electrode was studied using linear sweep polarzation and a-c impedance technique. During the deposition of Ni-Zn alloy hydrogen was evolved at the cathode surface to raise the pH sufficiently to form metal hydroxides. The mechanism of Ni-Zn codeposition can be accounted for two successive charge transfer reactions in which adsorbed metal hydroxide acts as an intermediate. Thee resulte were confirmed with a-c impedance measurements.
Formation of Silicon Nanoparticles Using SiH4 Pyrolysis at Atmospheric- and Low-Pressure
김광수,우대광,Jin-Hwan Park,두석광,김태성 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.3
The formation of particles using pyrolysis has many advantages over other particle manufacturing techniques. Specifically, pyrolysis can generate nanoparticles at atmospheric- and low-pressure, making the method suitable for many applications. Here, we synthesized silicon (Si) nanoparticles by using pyrolysis at atmospheric- (760 Torr) and low- (0.5 Torr) pressure and evaluated the characteristics of the Si nanoparticles that are relevant to applications in flash memory and energy device fabrication. As a result, we determined that the flow rate was an important factor for controlling the particle diameter and the coagulation of the Si nanoparticles. Also, the occurrence of oxidation in the furnace reduces natural oxidation, such that we can easily control the oxidation layer on the Si nanoparticles. Also, we found that there were differences between the Si nanoparticles synthesized at low-pressure and the Si nanoparticles synthesized at atmospheric-pressure. At low-pressure, the residence time of the generated Si nanoparticles was much shorter than that at atmospheric-pressure and by making use of this difference, we could prevent coagulation and obtain smaller and more uniform Si nanoparticles.