Surface-enhanced Raman scattering of rhodamine 6G on nanowire arrays decorated with gold nanoparticles

Jianing Chen, Thomas Mårtensson, Kimberly Dick Thelander, Knut Deppert, Hongqi Xu, Lars Samuelson, Hongxing Xu

Research output: Contribution to journalArticlepeer-review

62 Citations (SciVal)

Abstract

We investigate the surface-enhanced Raman scattering (SERS) of rhodamine 6G (R6G) adsorbed on Au nanoparticles attached to InP nanowires. We find that nanowire arrays act as frameworks for effective SERS substrates with a significantly higher Raman signal sensitivity than a planar framework of Au nanoparticles adsorbed two-dimensionally on a flat surface. The SERS signal displays a clear polarization-dependent effect when the nanowires are arranged in a row. We also find that the SERS signal increases with time during continuous laser illumination. The plasmon-enhanced optical forces between Au nanoparticles may either move pairs of nanoparticles closer together or attract adsorbed molecules by moving them to the junctions of Au nanoparticle aggregates. Such effects by plasmon optical forces may cause the observed increase of the SERS signal with continuous laser illumination.
Original languageEnglish
Pages (from-to)275712-5 pp
JournalNanotechnology
Volume19
Issue number27
DOIs
Publication statusPublished - 2008

Subject classification (UKÄ)

  • Nano Technology

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