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Title: Characterization of CeO{sub 2} crystals synthesized with different amino acids

We investigated the relationship between the structures of the CeO{sub 2} products (particle size, morphology and their characteristics) prepared using different amino acids. Cerium hydroxide carbonate precursors were initially prepared by a hydrothermal method and were subsequently converted to CeO{sub 2} by its thermal decomposition. Various amino acids were used as structure-directing agents in the presence of cerium nitrate and urea as precursors. The results indicate morphology selectivity using different amino acids; CeO{sub 2} structures, such as quasi-prism-sphere, straw-bundle, urchin-flower like and polyhedron prisms, indeed could be produced. Raman and photoluminescence studies indicate the presence of oxygen vacancies in the CeO{sub 2} samples. Photoluminescence spectra of CeO{sub 2} with L-Valine exhibit stronger emission compared with other amino acids utilized under this study, indicating the higher degree of defects in these particles. This study clearly indicates that the degree of defects varied in the presence of different amino acids. Improved precision to control the crystal morphology is important in various material applications and our study provides a novel method to achieve this specificity. - Highlights: • We used urea hydrolysis of process for synthesis of CeO{sub 2}. • Structures have been directed using various amino acids. • We obtained straw bundle-like,more » quasi prism-sphere, polyhedron prisms and urchin flower-like based on amino acids. • We have found that amino acids could achieve the specificity of different degrees of defects. • This could provide the “tailor-make” of cerium crystals.« less
Authors:
 [1] ; ; ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [5]
  1. Department of Earth and Environmental Sciences, National Chung Cheng University, Minhsiung, Chiayi 621, Taiwan (China)
  2. Department of Physics, National Chung Cheng University, Minhsiung, Chiayi 621, Taiwan (China)
  3. Department of Chemical Engineering and Materials Science, Yuan Ze University, No. 135 Yuan-Tung Road, Chungli, Taoyuan 320, Taiwan (China)
  4. Department of Life Science, National Chung Cheng University, 168 University Road, Minhsiung, Chiayi 621, Taiwan (China)
  5. (China)
Publication Date:
OSTI Identifier:
22403612
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 98; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBONATES; CERIUM; CERIUM HYDROXIDES; CERIUM NITRATES; CERIUM OXIDES; COMPARATIVE EVALUATIONS; CRYSTAL GROWTH; CRYSTALS; EMISSION SPECTRA; HYDROTHERMAL SYNTHESIS; MORPHOLOGY; OXYGEN; PARTICLE SIZE; PHOTOLUMINESCENCE; PYROLYSIS; RAMAN SPECTRA; RAMAN SPECTROSCOPY; UREA; VACANCIES; VALINE