Surface-enhanced Raman scattering on semiconducting oxide nanoparticles

Oxide nature, size, solvent, and pH effects

Tarakeshwar Pilarisetty, Daniel Finkelstein-Shapiro, Sarah J. Hurst, Tijana Rajh, Vladimiro Mujica

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Semiconducting oxide nanoparticles have proven to be excellent in detecting extremely low-concentrations of molecules through surface-enhanced Raman scattering (SERS) effects. While the enhancement of the Raman activities arises from a large increase in polarizability due to charge transfer from the molecule to the semiconducting nanoparticle, little is known about how the oxide composition, nanoparticle size, solvent, or pH affects the observed Raman activities. In the current study, we examine these effects by carrying out extensive computational investigations of semiconducting TiO2, SnO2 and Fe2O3 nanoparticles and their complexes with both catechol and dopamine. An increase in the size of the oxide cluster or a decrease in the pH of the system under observation leads to enhanced Raman activities; the variation of the activities in different solvents is very much dependent on the nature of the vibrational modes. The marked increase in the Raman activities of molecules adsorbed on SnO2 or Fe2O3 over that of molecules adsorbed on TiO2 seems to indicate that these oxide nanoparticles would be useful substrates for SERS sensors. Our results also indicate that the Raman activities of some of the TiO2 modes are magnified upon adsorption of molecules, which concurs with some very recent experimental observations. All these results are consistent with a recently proposed theoretical model of SERS on semiconducting substrates. Further, this work has implications on the development of molecular sensing, dye-sensitized solar cells, and photocatalysis.

Original languageEnglish (US)
Pages (from-to)8994-9004
Number of pages11
JournalJournal of Physical Chemistry C
Volume115
Issue number18
DOIs
StatePublished - May 12 2011

Fingerprint

pH effects
Oxides
Raman scattering
Raman spectra
Nanoparticles
nanoparticles
Molecules
oxides
molecules
Photocatalysis
Substrates
dopamine
Charge transfer
Dopamine
low concentrations
vibration mode
Adsorption
solar cells
dyes
charge transfer

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Surface-enhanced Raman scattering on semiconducting oxide nanoparticles : Oxide nature, size, solvent, and pH effects. / Pilarisetty, Tarakeshwar; Finkelstein-Shapiro, Daniel; Hurst, Sarah J.; Rajh, Tijana; Mujica, Vladimiro.

In: Journal of Physical Chemistry C, Vol. 115, No. 18, 12.05.2011, p. 8994-9004.

Research output: Contribution to journalArticle

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