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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Compositional Analysis of Electrodeposited Cobalt Selenide Thin Films Using Continuous Flow Electrochemical Quartz Crystal Microgravimetry

2018년 8월 30일 16시 30분 07초
ELEC.P-506 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 19일 (금요일) 11:00~12:30
저자 및
Hyung-woo Jee, Ki Jung Paeng, Noseung Myung1,*
Department of Chemistry, Yonsei University, Korea
1Department of Applied Chemistry, Konkuk University, Korea

In this study, the composition of electrosynthesized cobalt selenide thin films was analyzed by electrochemical quartz crystal microgravimetry (EQCM) in a continuous flow mode. First, cobalt selenide films were electrodeposited on a Pt-EQCM electrode using a 0.1 M Na2SO2 electrolyte solution containing Co and Se precursor species at different potentials. A combination of sequential stripping and EQCM frequency monitoring protocol enabled mapping of the free Co, free Se, and CoSe content of the electrodeposited films. It was found that the composition of cobalt selenide film was very sensitive to the electrodeposition potential. The targeted CoSe content was maximum at −0.7 V and the free Co content was minimum at this potential. On the other hand, the free Se content decreased from ∼45% at −0.6 V to nearly 0% at −0.9 V. The film composition as established by the continuous flow analysis mode stood in stark contrast with the static (batch) mode where no free Co was observed in the films. Factors in these compositional differences as well as in the EQCM electrode geometry (face-down vs. face-up) are finally discussed.