Metal-carbon nanoclusters for SERS

Abstract

Metal-carbon materials exhibiting surface-enhanced Raman scattering have been synthesized by laser irradiation of colloidal systems consisting of carbon and noble metal nanoparticles. The dependence of the Raman scattering intensity on the material composition has been investigated. The possibility of detecting of the Raman spectrum of organic due DCM and rhodamine 6G is demonstrated. IntroductionThe formation of new photonic materials is a promising area in laser physics. Bimetallic complexes of noble metals with particle sizes from 1 to 100 nm in carbon matrix are widely used as materials for implementing surface enhanced Raman scattering (SERS) [1]. The application of carbon as a matrix, stabilizing metal nanoparticles and preventing their degradation in environment, is interesting and promising [2]. The metal-carbon materials based on carbyne are of particular interest. Carbyne is a carbon polymer material [3]. The distance between neighboring atoms in a carbyne chain is 0.128 nm and the distance between chains is 0.295 nm; these values are much smaller than the distances between atoms and between layers in graphite: 0.142 and 0.335 nm, respectively. Carbyne has a unique of the optical and electrical properties [4].In this paper, we report the results of studying the formation of metal-carbyne under laser irradiation of colloidal systems, consisting of carbon and noble-metal nanoparticles. It is shown that this irradiation leads to the formation of clusters, in which metal nanoparticles are interrelated by carbon chains. The Raman spectra of these structures exhibit SERS.