title: Direct observation of aluminium ions produced via pulsed laser ablation in liquid: a 'turn-on' fluorescence study.
abstract: An Al metal plate was ablated by a pulsed Nd-YAG laser to produce nano-structured Al and gamma-Al(2)O(3) in deionized water without any surfactants or catalysts. In this study, direct evidence for the production of Al(3+) ions from the plasma plume is presented for the first time by characterizing the absorption and emission spectra of their [Al(salophen)](+) complex. Very interestingly, a remarkable increase in the fluorescence intensity was observed when the Al(3+) ions, produced via the pulsed laser ablation, complexed with the salophen ligand. This fluorescence 'turn-on' behaviour of [Al(salophen)](+) was investigated by DFT/TD-DFT calculations. Based on these results, mechanisms for the production of aluminium and alumina nanoparticles in the pulsed laser ablation in liquid (PLAL) process are proposed.
authors.affiliation: Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Republic of Korea.
authors.forename: Seulki
authors.initials: S
authors.lastname: Lee
authors.forename: Ahreum
authors.initials: A
authors.lastname: Ahn
authors.forename: Myong Yong
authors.initials: MY
authors.lastname: Choi