Nanocomposite ZnO/Au formation by pulsed laser irradiation |
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Authors: | Geetika Bajaj |
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Institution: | Laser Processing and Spectroscopy Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India |
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Abstract: | The ZnO/Au nanocomposite formation involves synthesis of Au and ZnO colloidal solutions by 532 nm pulse laser ablation of metal targets in deionized water followed by laser irradiation of the mixed colloidal solution. The transmission electron microscope (TEM) and high-resolution transmission electron microscope (HRTEM) images show evolution of spherical particles into ZnO/Au nanonetworks with irradiation time. The formation mechanism of the nanonetwork can be explained on the basis of near resonance absorption of 532 nm irradiation by gold nanoparticles which can cause selective melting and fusion of gold nanoparticles to form network. The ZnO/Au nanocomposites show blue shift in the ZnO exciton absorption and red shift in the Au plasmon resonance absorption due to interfacial charge transfer. |
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Keywords: | Laser ablation in liquid Nanocomposite ZnO/Au UV-vis absorption |
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