Growth and optical properties of cerium dioxide nanocrystallites prepared by coprecipitation routes |
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| Authors: | Horng-Huey Ko Guoli Yang Huy-Zu Cheng Moo-Chin Wang XiuJian Zhao |
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| Affiliation: | 1. Department of Fragrance and Cosmetic Science, Kaohsiung Medical University, 100 Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan;2. State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology), Wuhan 430070, People''s Republic of China;3. Teaching and Research Section for Mechanical Foundation, Foundation Department, Wuhan 430070, PR China;4. Department of Materials Science and Engineering, I-Shou University, 1 Huseh-Cheng Road, Section 1, Ta-Hsu, Kaohsiung 84001, Taiwan |
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| Abstract: | Nanosized cerium dioxide (CeO2) powders have been synthesized using coprecipitation methods and cerium nitrate hexahydrate (Ce(NO3)3·6H2O) as the starting material. The growth and optical properties of nanosized CeO2 powders were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), nano-beam electron diffraction (NBED), high resolution TEM (HRTEM), and ultraviolet–visible (UV–vis) absorption spectrophotometry. The XRD result shows that the dried CeO2 precursor powders (both before and after calcination at various temperatures and times) contained a single crystalline phase of CeO2. In the dried precursor powders, the crystallites of CeO2 measured 10.4 nm and 66.8 nm before and after calcination at 1273 K for 240 min, respectively. The indirect band gap energy (Ei) of CeO2 decreased from 3.03 eV to 2.68 eV as the crystallite size increased from 10.4 nm to 66.8 nm, whereas the direct band gap energy (Ed) of CeO2 also decreased from 3.79 eV to 3.38 eV. |
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| Keywords: | C. Optical properties D. CeO2 Crystallite size Band gap energy |
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