Demonstration of surface-enhanced Raman scattering by tunable, plasmonic gallium nanoparticles.

Journal Article (Journal Article)

Size-controlled gallium nanoparticles deposited on sapphire were explored as alternative substrates to enhance Raman spectral signatures. Gallium's resilience following oxidation is inherently advantageous in comparison with silver for practical ex vacuo nonsolution applications. Ga nanoparticles were grown using a simple molecular beam epitaxy-based fabrication protocol, and monitoring their corresponding surface plasmon resonance energy through in situ spectroscopic ellipsometry allowed the nanoparticles to be easily controlled for size. The Raman spectra obtained from cresyl fast violet (CFV) deposited on substrates with differing mean nanoparticle sizes represent the first demonstration of enhanced Raman signals from reproducibly tunable self-assembled Ga nanoparticles. Nonoptimized aggregate enhancement factors of approximately 80 were observed from the substrate with the smallest Ga nanoparticles for CFV dye solutions down to a dilution of 10 ppm.

Full Text

Duke Authors

Cited Authors

  • Wu, PC; Khoury, CG; Kim, T-H; Yang, Y; Losurdo, M; Bianco, GV; Vo-Dinh, T; Brown, AS; Everitt, HO

Published Date

  • September 2009

Published In

Volume / Issue

  • 131 / 34

Start / End Page

  • 12032 - 12033

PubMed ID

  • 19655747

Pubmed Central ID

  • PMC2750845

Electronic International Standard Serial Number (EISSN)

  • 1520-5126

International Standard Serial Number (ISSN)

  • 0002-7863

Digital Object Identifier (DOI)

  • 10.1021/ja903321z


  • eng