Materials Transactions, Vol.52 No.04 (2011) pp.768-771
© 2011 The Japan Institute of Metals
Laser-Induced Synthesis of CaMoO4 Nanocolloidal Suspension and Its Optical Properties
1Department of Advanced Materials Science and Engineering, Dankook University, Cheonan, Chungnam 330-714, Korea
2School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center (SPRC), Chonbuk National University, Jeonju 561-756, Korea
3Department of Multimedia Engineering, Dankook University, Cheonan, Chungnam 330-714, Korea
Pulsed laser ablation in a liquid phase was employed successfully to synthesize a calcium molybdate (CaMoO4) nanocolloidal suspension. The crystalline phase, particle morphology, particle size distribution, absorbance, optical band-gap and photoluminescence (PL) were examined. Stable colloidal suspensions consisting of well-dispersed CaMoO4 nanoparticles with a narrow size distribution could be obtained without a surfactant. The optical absorption edge located near 270 nm was blue-shifted by approximately 70 nm compared to that reported for bulk crystals. The estimated optical energy band-gap was 4.7 eV and the PL spectrum was blue-shifted at approximately 430 nm compared to the emission of bulk CaMoO4 target (525 nm). The observed band-gap widening and blue-shift of PL emission was attributed to the quantum-size effect due to the very small size of the CaMoO4 nanoparticles prepared by pulsed laser ablation in deionized water.
(Received 2010/12/1; Accepted 2011/1/6; Published 2011/2/23)
Keywords: CaMoO4, pulsed laser ablation, nanocolloidal suspension, quantum-size effect
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