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Strong quantum confinement effect in nanocrystalline cerium oxide
Authors:N Sabari Arul  D Mangalaraj  Pao Chi Chen  N Ponpandian  C Viswanathan
Affiliation:1. Department of Nanoscience and Technology, Bharathiar University, Coimbatore-641 046, India;2. Department of Chemical and Materials Engineering, Lunghwa University of Science and Technology, Taoyuan, Taiwan;1. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA;2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;1. Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, P.O. Box 16765-654, Tehran, Iran;2. Mining and Metallurgical Engineering Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran;3. Department of Inorganic Pigments and Glazes, Institute for Color Science and Technology (ICST), Tehran, Iran;1. CNRS, ICMCB, UPR9048, F-33600 Pessac, France;2. Université de Bordeaux, ICMCB, UPR9048, F-33600 Pessac, France;1. Hydrogen and Fuel Cell Research Centre and Graduate School, Department of Energy Storage/Conversion Engineering, Repubic of Korea;2. Department of Life Science, Chonbuk National University, Jeonju-si, Jeollabuk-do 54896, Republic of Korea;3. R&D Center for Canutech, Business Incubation Center of Chonbuk National University, Jeonju-si, Jeollabuk-do 54896, Republic of Korea;4. College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University, Iksan-si, Jeollabuk-do 54596, Republic of Korea;5. Department of Applied Chemistry, College of Applied Science, Kyung Hee University, Yongin-si, Gyeonggi-do 17104, Republic of Korea
Abstract:Highly uniform and well-dispersed cerium oxide quantum dots were successfully synthesized by simple precipitation method by using cerium ammonium nitrate and ammonium hydroxide as precursor materials with suitable conditions. The X-ray diffraction pattern indicates the formation of cubic phase CeO2. The average particle size of cerium oxide from high resolution transmission electron microscopy (HRTEM) was found to be 3 nm. The X-ray photoelectron (XPS) spectrum confirms the presence of Ce3+ in CeO2. Optical studies by UV–vis spectroscopy for the synthesized CeO2 nanoparticles exhibit a blue shift (Eg = 3.78 eV) with respect to the bulk material (Eg = 3.15 eV) due to quantum confined exciton absorption.
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