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  • 02월 28일 19시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제111회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Physico-chemical dimension control of manganese oxide by top-down approach

2013년 2월 14일 16시 40분 47초
MAT.P-1043 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 17일 (수요일) 16:00~19:00
저자 및
강명구, 정수경, 이원재1, 백승민2, 정 현*
동국대학교 화학과, Korea
1경북대학교 자연과학대학/화학과, Korea
2경북대학교 화학과, Korea
We successfully control dimension and phase of manganese oxide by physico- chemical top-down method. The pristine layered K0.5MnO2 was prepared by conventional solid state reaction of K2CO3 and Mn2O3 at 800 ℃. Unilamellar manganese dioxide (MnO2) nanosheets (two-dimensional) were obtained by intercalation and exfoliation reaction of the protonic manganese dioxide with tetrabutylammonium (TBA) cation. Because the suitable amount content of proton and organic material have key role in this physico-chemical top-down method, well-dispersed MnO2 nanosheets were adjusted to pH 6 by addition of 1M HCl and removed excess TBA cation by washing. The phase transformation of layered MnO2 nanosheets to Mn3O4 nanocrystals was successfully carried out by heat-treatment even at 150 ℃. And dimension of obtained particles was controlled as nanorods (one-dimensional) or nanoparticles (zero-dimensional) depending upon applied heat temperature (from 150 ℃ to 300 ℃). These nanocrystals have higher capacitance properties than that of the reference bulk Mn3O4 (Sigma Aldrich) powder due to their nano-size effect. Physicochemical characterization and transformation mechanism study were performed by using X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). Dimensions of Mn3O4 nanocrystals were confirmed by high-resolution transmission electron microscopy (HR-TEM). The component and organic content of the sample were measured by Fourier transform infrared (FT-IR) spectroscopy, elemental analysis (EA) and thermal analysis, including thermogravimetry (TG) and differential thermal analysis (DTA). The capacitance properties of Mn3O4 nanocrystals investigated in 1M Na2SO4electrolyte showed maximum capacitance of 160 F/g at scan rate 2 mV/s.