Gold nanoparticles have been synthesized by laser ablation. Firstly it was used laser ablation method in deionized water to produced
nanogold particles via 1064nm laser wavelength produced by a Q-switched Nd-YAG laser, pulse width of 10 ns, repeating frequency
of 6 Hz, at ambient pressure and temperature with different energies of laser shots. UV-visible absorption spectra of colloidal of
synthesized nanogold have been studied and transmission electron microscope was used to investigate the sizes and shapes of the
nanogold particles, secondly Magnetic field assisted Laser ablation system is constructed by a (700 gauss) of magnetic field
produced by permanent magnetic poles plates was applied above the target. The results of UV visible spectra and TEM images
showed that the absorption peak increase and its width decrease as the energy increases which indicate that the concentration of the
nanogold particles is increased and the nanoparticles become less distribution in the presence of magnetic field. The absorption peaks
have highest values and was noticed that absorption peak positions shift to short wavelength (blue shift) which mean that the smaller
average size, and that the applied constant magnetic field can enhances the laser shots energy.
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July-Sept 2014
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