Quantitative assessment of pores in oxidized carbon spheres using scanning tunneling microscopy

被引:38
作者
Vignal, V [1 ]
Morawski, AW
Konno, H
Inagaki, M
机构
[1] Hokkaido Univ, Grad Sch Engn, Sapporo, Hokkaido 0608628, Japan
[2] Tech Univ Szczecin, Inst Inorgan Chem Technol, PL-70322 Szczecin, Poland
关键词
D O I
10.1557/JMR.1999.0146
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Surface heterogeneity, particularly shape and size of pores on the surface of activated carbon spheres were studied by using scanning tunneling microscopy (STM) and field-emission type scanning electron microscopy (FE-SEM), Spheres were carbonized either in N-2 Or CO2 atmosphere and oxidized ones were used as samples. A new numerical method based on the determination of contour maps from STM images was proposed in order to determine the size distribution in micropores. These results were discussed with respect to the adsorption of gas and liquid molecules. A good correlation between Brunaner, Emmett, and Teller (BET) surface area determined from adsorption isotherms of N-2 at 77 K and the number of pores with the size of 0.5-1.8 nm was observed, indicating that the proposed procedure to analyze the pore size distribution is effective.
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页码:1102 / 1112
页数:11
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