Formation of dielectric core/metal sheath nanowire composites and their application to SERS sensing

Hua Qi; Dimitri A. Alexson; Orest Glembocki; S. M. Prokes

doi:10.1117/12.836199

3 September 2009 Formation of dielectric core/metal sheath nanowire composites and their application to SERS sensing

Hua Qi, Dimitri A. Alexson, Orest Glembocki, S. M. Prokes

Proceedings Volume 7406, Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials; 74060X (2009) https://doi.org/10.1117/12.836199
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

Abstract

There has been significant interest in a variety of nanowire (NW) systems for various sensing applications. We had developed highly sensitive dielectric core/metal sheath nanowires composites which serve as surface-enhanced Raman scattering (SERS) substrates. Previously, our composites were fabricated using e-beam deposition, which has the problem of incomplete coverage. Here we report an electroless (EL) plating approach to cover the NWs with a silver sheath, producing the core/metal NW structures for the SERS measurements. In comparison with the common silver deposition via e-beam evaporation, electroless coating can result in the full metal coverage on NWs. Therefore, this approach provides a way to fully cover nanostructures with Ag, including NWs arrays, regardless of the orientations and shapes of the nanostructures. SERS measurements on EL produced Ag/NWs composites show stronger signals than those produced by e-beam evaporation. Electric field calculations suggest that the strong SERS signal is due to plasmonic coupling of neighboring closely spaced islands.

Citation Download Citation

Hua Qi, Dimitri A. Alexson, Orest Glembocki, and S. M. Prokes "Formation of dielectric core/metal sheath nanowire composites and their application to SERS sensing", Proc. SPIE 7406, Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials, 74060X (3 September 2009); https://doi.org/10.1117/12.836199

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