Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403642 | Journal of Luminescence | 2007 | 4 Pages |
Abstract
We report the first synthesis of calcium molybdate (CaMoO4) nanoparticles by pulsed laser ablation (PLA) in deionized water. The crystalline phase, particle morphology, particle size distribution, absorbance, optical band-gap and photoluminescence (PL) were investigated. Stable colloidal suspensions consisting of well-dispersed CaMoO4 nanoparticles with narrow size distribution could be obtained without any surfactant. Optical absorption edge is located near 270Â nm, which is blue-shifted about 70Â nm than that of reported data in bulk crystals. The estimated optical energy band-gap was 4.7Â eV and PL spectrum was positioned in blue-shifted region around 430Â nm compared with emission at 525Â nm of bulk CaMoO4 target. The observed band-gap widening and blue-shift of PL emission could be ascribed to the quantum-size effect due to the very small size of the CaMoO4 nanoparticles prepared by PLA in deionized water.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Jeong Ho Ryu, Bong Geun Choi, Jong-Won Yoon, Kwang Bo Shim, Kinuyo Machi, Kenji Hamada,