Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals

E. Sheremet, A. G. Milekhin, R. D. Rodriguez, T. Weiss, M. Nesterov, E. E. Rodyakina, O. D. Gordan, L. L. Sveshnikova, T. A. Duda, V. A. Gridchin, V. M. Dzhagan, M. Hietschold, D. R.T. Zahn

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Surface- and tip-enhanced resonant Raman scattering (resonant SERS and TERS) by optical phonons in a monolayer of CdSe quantum dots (QDs) is demonstrated. The SERS enhancement was achieved by employing plasmonically active substrates consisting of gold arrays with varying nanocluster diameters prepared by electron-beam lithography. The magnitude of the SERS enhancement depends on the localized surface plasmon resonance (LSPR) energy, which is determined by the structural parameters. The LSPR positions as a function of nanocluster diameter were experimentally determined from spectroscopic micro-ellipsometry, and compared to numerical simulations showing good qualitative agreement. The monolayer of CdSe QDs was deposited by the Langmuir-Blodgett-based technique on the SERS substrates. By tuning the excitation energy close to the band gap of the CdSe QDs and to the LSPR energy, resonant SERS by longitudinal optical (LO) phonons of CdSe QDs was realized. A SERS enhancement factor of 2 × 103 was achieved. This allowed the detection of higher order LO modes of CdSe QDs, evidencing the high crystalline quality of QDs. The dependence of LO phonon mode intensity on the size of Au nanoclusters reveals a resonant character, suggesting that the electromagnetic mechanism of the SERS enhancement is dominant. Finally, the resonant TERS spectrum from CdSe QDs was obtained using electrochemically etched gold tips providing an enhancement on the order of 104. This is an important step towards the detection of the phonon spectrum from a single QD.

Original languageEnglish
Pages (from-to)21198-21203
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume17
Issue number33
DOIs
Publication statusPublished - 22 Dec 2014
Externally publishedYes

Fingerprint

Nanocrystals
Semiconductor quantum dots
Raman scattering
nanocrystals
quantum dots
Raman spectra
Nanoclusters
Surface plasmon resonance
nanoclusters
surface plasmon resonance
augmentation
Phonons
Laser modes
Gold
Monolayers
phonons
gold
Electron beam lithography
Excitation energy
Ellipsometry

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals. / Sheremet, E.; Milekhin, A. G.; Rodriguez, R. D.; Weiss, T.; Nesterov, M.; Rodyakina, E. E.; Gordan, O. D.; Sveshnikova, L. L.; Duda, T. A.; Gridchin, V. A.; Dzhagan, V. M.; Hietschold, M.; Zahn, D. R.T.

In: Physical Chemistry Chemical Physics, Vol. 17, No. 33, 22.12.2014, p. 21198-21203.

Research output: Contribution to journalArticle

Sheremet, E, Milekhin, AG, Rodriguez, RD, Weiss, T, Nesterov, M, Rodyakina, EE, Gordan, OD, Sveshnikova, LL, Duda, TA, Gridchin, VA, Dzhagan, VM, Hietschold, M & Zahn, DRT 2014, 'Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals', Physical Chemistry Chemical Physics, vol. 17, no. 33, pp. 21198-21203. https://doi.org/10.1039/c4cp05087h
Sheremet, E. ; Milekhin, A. G. ; Rodriguez, R. D. ; Weiss, T. ; Nesterov, M. ; Rodyakina, E. E. ; Gordan, O. D. ; Sveshnikova, L. L. ; Duda, T. A. ; Gridchin, V. A. ; Dzhagan, V. M. ; Hietschold, M. ; Zahn, D. R.T. / Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals. In: Physical Chemistry Chemical Physics. 2014 ; Vol. 17, No. 33. pp. 21198-21203.
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AU - Rodyakina, E. E.

AU - Gordan, O. D.

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AU - Duda, T. A.

AU - Gridchin, V. A.

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