Synthesis, characterization and SERS activity of Au-Ag nanorods |
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| Authors: | Philip Daizy Gopchandran K G Unni C Nissamudeen K M |
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| Institution: | Department of Physics, Mar Ivanios College, Thiruvananthapuram 695015, India. |
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| Abstract: | The formation mechanism and morphology of Au-Ag bimetallic colloidal nanoparticles depend on the composition. Ag coated Au colloidal nanoparticles have been prepared by deposition of Ag through chemical reduction on performed Au colloid. The composition of the Au(100-x)-Ag(x) particles was varied from x=0 to 50. The obtained colloids were characterized by UV-vis spectroscopy and transmission electron microscopy (TEM). The Au(80)-Ag(20) colloid consists of alloy nanorods with dimension of 25nmx100nm. The activity of these nanorods in surface enhanced Raman spectroscopy (SERS) was checked by using sodium salicylate as an adsorbate probe. Intense SERS bands are observed indicating its usefulness as a SERS substrate in near infrared (NIR) laser excitation. |
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| Keywords: | Gold nanoparticles Mixed Au– Ag nanoparticles Au– Ag alloy nanorods UV– vis spectra TEM SERS NIR laser excitation Sodium salicylate |
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