Characterization of surface enhanced Raman scattering (SERS) substrates fabricated from colloidal printing inks

Manuel Figueroa; William Stephenson; Kambiz Pourrezaei; Somdev Tyagi

doi:10.1117/12.847088

16 February 2010 Characterization of surface enhanced Raman scattering (SERS) substrates fabricated from colloidal printing inks

Manuel Figueroa, William Stephenson, Kambiz Pourrezaei, Somdev Tyagi

Author Affiliations +

Proceedings Volume 7576, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications II; 75761T (2010) https://doi.org/10.1117/12.847088
Event: SPIE BiOS, 2010, San Francisco, California, United States

Abstract

Surface enhanced Raman scattering (SERS) is now a well-established technique to greatly amplify the normally weak Raman scattering signals. The amplification is achieved by using SERS substrates - specially structured metallic substrates with nano-scale morphological features. One of the most widely used methods for SERS amplification employs nanoparticles of silver or gold either in colloidal suspension or in dry-drop form. In such substrates SERS amplification factors (AF) exceeding 10¹² have been reported. The reproducibility of the colloid-based substrates, however, is a problem. The lack of reproducibility can be caused by a variety of factors that can change the interparticle distances. In this paper we show that thermal annealing of SERS substrates fabricated using commercially available nano-particle inks can be used to create thermally stable substrates with high reproducibility. It appears that thermal annealing destroys the unstable hot-spots with very high AF's but still leaves the sample with high AF sites yielding spatially averaged substrate AF's exceeding 10⁸.

Citation Download Citation

Manuel Figueroa, William Stephenson, Kambiz Pourrezaei, and Somdev Tyagi "Characterization of surface enhanced Raman scattering (SERS) substrates fabricated from colloidal printing inks", Proc. SPIE 7576, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications II, 75761T (16 February 2010); https://doi.org/10.1117/12.847088

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