Abstract
AbstractWe report the photoluminescence (PL) properties of aluminum oxide nanoparticles synthesized in a liquid confined ambient using pulsed laser ablation of aluminum. The colloidal suspension was dried on a quartz substrate using an IR heat lamp prior to further structural and optical characterization. TEM measurement confirms the particles of nano dimension with average size of ∼23 nm and of spherical shape. XRD measurement shows a strong peak at 31.5° indicating the presence of aluminum oxide. The PL measurement using xenon lamp as excitation source shows a broad peak. The PL peak position shifts towards longer wavelength as the excita‐ tion wavelength is changed to longer wavelengths. The shift may be due to presence of intermediate compounds like Al2O in addition to Al2O3. The appearance of luminescence bands may be associated with the defects formed in the non‐equilibrium phases and the oxygen vacancy defects which are specific features of the nanostructured state in nanostructures formed during the laser ablation inside the liquid confined ambient. A comparative study of laser ablated aluminum plasma in air and water to elucidate the various processes is also presented. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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