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아노드의 결정성에 따른 전기도금 구리박막의 기계적 특성 연구
강병학,박지은,박강주,유다영,이다정,이동윤,Kang, Byung-Hak,Park, Jieun,Park, Kangju,Yoo, Dayoung,Lee, Dajeong,Lee, Dongyun 한국재료학회 2016 한국재료학회지 Vol.26 No.12
We performed this study to understand the effect of a single-crystalline anode on the mechanical properties of as-deposited films during electrochemical deposition. We used a (111) single- crystalline Cu plate as an anode, and Si substrates with Cr/Au conductive seed layers were prepared for the cathode. Electrodeposition was performed with a standard 3-electrode system in copper sulfate electrolyte. Interestingly, the grain boundaries of the as-deposited Cu thin films using single-crystalline Cu anode were not distinct; this is in contrast to the easily recognizable grain boundaries of the Cu thin films that were formed using a poly-crystalline Cu anode. Tensile testing was performed to obtain the mechanical properties of the Cu thin films. Ultimate tensile strength and elongation to failure of the Cu thin films fabricated using the (111) single-crystalline Cu anode were found to have increased by approximately 52 % and 37 %, respectively, compared with those values of the Cu thin films fabricated using apoly-crystalline Cu anode. We applied ultrasonic irradiation during electrodeposition to disturb the uniform stream; we then observed no single-crystalline anode effect. Consequently, it is presumed that the single-crystalline Cu anode can induce a directional/uniform stream of ions in the electrolyte that can create films with smeared grain boundaries, which boundaries strongly affect the mechanical properties of the electrodeposited Cu films.
Rutile - Type 금속산화물전극에 의한 요오드산염의 생성(1)
남종우,이충영,강병학 한국화학공학회 1988 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.26 No.2
열분해법으로 제작한 Ti/RuO₂전극을 사용하여 요오드화칼륨에 대한 cyclic voltammogram 및 전류-전위곡선을 측정하여 요오드이온의 양극산화반응 내용을 검토하고 매크로전해에 의하여 요오드화칼륨용액으로부터 요오드산염을 전해제조할 경우 최적 전해조건을 검토하였다. 요오드이온은 가역적인 제1단계의 전극반응에 의하여 요오드로 산화되며 요오드는 전해액의 액성에 따라 비가역적인 제2단계의 전극반응 또는 화학반응에 의하여 요오드산이온으로 산화된다. 요오드산염의 전해제조는 pH10의 약알칼리성용액에서 가장 유리하였으며 정전위 및 정전류전해 결과 1.05V 및 30A/dm²에서 가장 높은 전류효율을 나타내었다. Cyclic voltammogram and current-voltage curve of potassium iodide were measured on Ti/RuO₂ electrode, prepared by thermal decomposition method, to study the reaction for iodate formation by oxidation of iodide and macro-electrolysis was carried out to investigate the optimum conditions for electrolytic preparation of iodate from potassium iodide solution. At first, iodide is oxidized to iodine by reversible electrode reaction and then iodine is oxidized to iodate, depends on the pH of electrolyte, by irreversible electrode reaction or chemical reaction. The electrolytic preparation of iodate is effective in weak alkaline solution (pH 10). As a result of electrolysis at constant voltage and constant current, maximum current efficiency was obtained at 1.05 V and 30 A/dm².