期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 13, 期 12, 页码 7149-7158出版社
SPRINGER
DOI: 10.1007/s11051-011-0626-2
关键词
Biotemplate; Biomorphic mineralization; China rose petal; Nanosheet; Synthesis
资金
- National Natural Science Foundation of China [21071107]
- Provincial Science Foundation of Jiangsu [BK2008541]
China rose petal was used as robust biotemplate for the facile fabrication of novel ceria nanosheet with a thickness of about 7 nm via a continuous infiltration process. The presence of well-resolved peaks ([111], [200], [220], and [311]) for the products revealed the formation of the fluorite-structured CeO2. The detailed characterization by field-emission scanning electron microscope (FESEM), field-emission transmission electron microscope (FETEM), and atomic force microscopy (AFM) exhibited the biomorphic structure of polycrystalline ceria film with the nanoparticle size of ca. 6.98 nm. Based on the surface chemistry and biochemistry processes, a possible mechanism for the formation of CeO2 nanosheets is proposed. Furthermore, nitrogen adsorption-desorption measurement and photoluminescence spectrum (PL) were employed to characterize the samples. The ceria nanosheet showed the existence of mesopores (pores 2-4 nm diameter) on its surface and a broad emission ranging from 350 to 500 nm in photoluminescence spectrum. X-ray photoelectron spectroscopy analysis (XPS) confirmed that the mesoporous nanosheets possessed more surface vacancies than the bulk CeO2; hence these hierarchical CeO2 layers appear to be potential candidates for catalytic applications.
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