Synthesis, structure and characterization of Co doped CeO2 nanoparticles

International Conference on Recent Advancements and Effectual Researches in Engineering Science and Technology

Tiwari, Saurabh^1 ; Balasubramanian, Nivedha^2 ; Biring, Sajal^3 ; Sen, Somaditya^1

Metallurgical Engineering and Material Sciences, Indian Institute of Technology Indore, India^1

Department of Physics, PSG College of Arts and Science, Coimbatore, India^2

Electronic Engg., Ming Chi University of Technology, New Taipei City, Taiwan^3

关键词: Characteristic peaks;    Emission quenching;    Lattice distortions;    Nanocrystalline Co;    Non-radiative;    Photoluminescence properties;    Raman analysis;    Urbach energy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/396/1/012035/pdf
DOI  :  10.1088/1757-899X/396/1/012035

来源: IOP

【 摘 要 】

Nanocrystalline Co doped CeO2 particles were synthesized using simple sol-gel method. The structural, vibrational and photoluminescence properties of synthesized nanoparticles were investigated using X-ray power diffraction (XRD), UV-visible spectroscopy, Raman spectroscopy and Photolumiscence (PL) spectroscopy. XRD showed that the lattice shrink and crystallite size decreases with doping which leads to lattice distortion and generation of strain. The bandgap is red shifted due to formation of defects states between bandgap as confirmed by urbach energy calculation. The PL intensity of Co doped CeO2 reduces which is due to the non radiative emission centres. Raman analysis showed characteristic peak at 460.8 cm-1 of Ce-O vibrational unit. A weak peak emerges with doping at ∼ 540-640 cm-1 hints generation of oxygen vacancies related defects which also acts as emission quenching center.