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THE EFFECT OF APPLIED EXTERNAL MAGNETIC FIELD ON THE SYNTHESIS OF NANOGOLD PARTICLES VIA LASER ABLATION
مازن كامل حامد
Authors : Raad M.S.Al-hddad , Thamir Jumaa , Mazin Kamil Hamid3
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