Synthesis of CaWO4 nanocolloidal suspension via pulsed laser ablation and its optical properties |
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| Authors: | Jeong Ho Ryu Gyeong Seon Park Kang Min Kim Chang Sung Lim Jong-Won Yoon Kwang Bo Shim |
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| Affiliation: | (1) Electro Materials & Device Center, Corporate R&D Institute, Samsung Electro-Mechanics Co., LTD., 314, Maetan 3-Dong, Yeongtong-Gu, Suwon-City, Guunggi-Do, 443-743, South Korea;(2) Division of Advanced Materials Science Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Gu, Seoul, 133-791, South Korea;(3) Department of Advanced Materials Science and Engineering, Hanseo University, Seosan, 356-706, South Korea |
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| Abstract: | Pulsed laser ablation (PLA) in the liquid phase was successfully employed to synthesize calcium tungstate (CaWO4) nanocolloidal suspension. The crystalline phase, particle morphology and laser ablation mechanism for the colloidal nanoparticles were investigated using XRD, TEM and SEM. The obtained colloidal suspension consisted of well-dispersed CaWO4 nanoparticles which showed a spherical shape with sizes ranging from 5 to 30 nm. The laser ablation and the nanoparticle forming process were discussed under consideration of the photo-ablation mechanism, where the nanoparticles were generated by rapid condensation of the plume in high pressured ethanol vapor. The optical properties of the prepared CaWO4 colloidal nanoparticles were analyzed in detail using XPS, Raman spectroscopy, UV-Vis spectroscopy and PL spectrophotometry. The optical band gap was estimated by Tauc and Menths law. PACS 42.62.-b; 82.70.Dd; 78.55.Hx; 81.07.Wx |
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