期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 108, 期 50, 页码 19293-19298出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp046142n
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Mesostructured hollow spheres of graphitic N-doped carbon (CNx) materials may be nanocast from solid core mesoporous silica SBA-15 spheres via a chemical vapor deposition (CVD) route. The hollow spheres are generated when the SBA-15 silica/carbon composite obtained after CVD is subjected to silica etching in hydrofluoric (HF) acid. Hollow spheres are only obtained for CVD temperatures above 900 degreesC; here we present data on materials prepared at 1000 degreesC. The use of acetonitrile as carbon precursor results in N-doped (CNx) materials with nitrogen content of ca. 6.5 wt %. The CNx hollow spheres prepared at 1000 degreesC exhibit a high level of graphitization as evidenced by powder X-ray diffraction analysis and Raman spectrocopic studies. The CNx hollow spheres also exhibit good mesostructural ordering and have high surface area (779 m(2)/g) and pore volume (0.66 cm(3)/g). We propose a mechanism for the formation of the hollow spheres and clarify the importance of the CVD temperature in their formation.
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