Aluminum Film-Over-Nanosphere Substrates for Deep-UV Surface-Enhanced Resonance Raman Spectroscopy

Bhavya Sharma, M. Fernanda Cardinal, Michael B. Ross, Alyssa B. Zrimsek, Sergei V. Bykov, David Punihaole, Sanford A. Asher, George C. Schatz, Richard P. Van Duyne

Research output: Contribution to journalArticlepeer-review

83 Scopus citations


We report here the first fabrication of aluminum film-over nanosphere (AlFON) substrates for UV surface-enhanced resonance Raman scattering (UVSERRS) at the deepest UV wavelength used to date (δex = 229 nm). We characterize the AlFONs fabricated with two different support microsphere sizes using localized surface plasmon resonance spectroscopy, electron microscopy, SERRS of adenine, tris(bipyridine)ruthenium(II), and trans-1,2-bis(4-pyridyl)-ethylene, SERS of 6-mercapto-1-hexanol (as a nonresonant molecule), and dielectric function analysis. We find that AlFONs fabricated with the 210 nm microspheres generate an enhancement factor of approximately 104-5, which combined with resonance enhancement of the adsorbates provides enhancement factors greater than 106. These experimental results are supported by theoretical analysis of the dielectric function. Hence our results demonstrate the advantages of using AlFON substrates for deep UVSERRS enhancement and contribute to broadening the SERS application range with tunable and affordable substrates.

Original languageEnglish (US)
Pages (from-to)7968-7973
Number of pages6
JournalNano letters
Issue number12
StatePublished - Dec 14 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.


  • UV resonance Raman spectroscopy (UVRRS)
  • aluminum plasmonics
  • film-overnanosphere substrates
  • surface-enhanced Raman spectroscopy (SERS)


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