A Comparative Study of Visible Raman Scattering of Ceria Prepared by Sol-gel and Hydrothermal Techniques with Gold Nanoparticles

3rd International Conference on Manufacturing, Material and Metallurgical Engineering

机械制造;材料科学;冶金学

Nur Syafi'Ie Md Idris, Muhammad^1 ; Chiang, Hai-Pang^2,3 ; Muslim, Noormariah^1 ; Chou Chau, Yuan-Fong^1 ; Mahadi, Abdul Hanif^1 ; Voo, Nyuk Yoong^1 ; Lim, Chee Ming^1

Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong

BE 1410, Brunei^1

Institute of Optoelectronic Sciences, National Taiwan Ocean University, No. 2 Pei-Ning Rd., Keelung

202, Taiwan^2

Institute of Physics, Academia Silica, Taipei

11529, Taiwan^3

关键词: Comparative studies;    Direct current magnetron sputtering;    Electrical field;    Glass substrates;    Hydrothermal techniques;    Localized surface plasmon resonance;    Longitudinal optical modes;    Nano-crystalline structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/409/1/012012/pdf
DOI  :  10.1088/1757-899X/409/1/012012

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Nano-structured ceria was synthesized by using sol-gel and hydrothermal techniques. Prior to measurements by Raman spectroscopy, the prepared ceria was dispersed onto glass substrates by spin-coating, and this was followed by the deposition of gold nano-particles onto the surface of the ceria by direct current magnetron sputtering. The F2g Raman peak, oxygen vacancy and longitudinal optical modes of ceria were successfully observed with visible Raman laser excitation wavelength of 532 nm at non-resonance Raman conditions. The surface oxygen adsorption on ceria surface was also detected. The F2g Raman peaks of ceria for all of the samples were red-shifted because of the nano-crystalline structure and strain effect on the samples. In the case of the hydrothermally processed gold coated ceria, the F2g Raman peak was further red-shifted to 451 cm-1 because of temperature effect and anharmonicity, and the peak intensity was also found to be enhanced by at least one order of magnitude (x13). This increase in peak intensity was attributed to the electrical field enhancement via localized surface plasmon resonance of the gold nano-particles.