金-银纳米棒的合成、表征及表面增强拉曼散射活性

Synthesis, characterization and SERS activity of Au-Ag nanorods.

作者信息

Philip Daizy, Gopchandran K G, Unni C, Nissamudeen K M

机构信息

Department of Physics, Mar Ivanios College, Thiruvananthapuram 695015, India.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2008 Sep;70(4):780-4. doi: 10.1016/j.saa.2007.09.016. Epub 2007 Sep 25.

DOI:10.1016/j.saa.2007.09.016

PMID:17964213

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 Au100-x-Agx particles was varied from x=0 to 50. The obtained colloids were characterized by UV-vis spectroscopy and transmission electron microscopy (TEM). The Au80-Ag20 colloid consists of alloy nanorods with dimension of 25nm x 100nm. 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.

摘要

金-银双金属胶体纳米粒子的形成机制和形态取决于其组成。通过在已制备好的金胶体上进行化学还原沉积银，制备了包覆银的金胶体纳米粒子。Au100-x-Agx粒子的组成从x = 0变化到50。通过紫外-可见光谱和透射电子显微镜（TEM）对所得胶体进行了表征。Au80-Ag20胶体由尺寸为25nm×100nm的合金纳米棒组成。以水杨酸钠作为吸附探针，检测了这些纳米棒在表面增强拉曼光谱（SERS）中的活性。观察到强烈的SERS谱带，表明其在近红外（NIR）激光激发下作为SERS基底的实用性。