SERS of Semiconducting Nanoparticies (TiO2 Hybrid Composites)

Musumeci, Anthony, Gosztola, David, Schiller, Tara, Dimitrijevic, Nada M., Mujica, Vladimiro, Martin, Darren and Rajh, Tijana (2009) SERS of Semiconducting Nanoparticies (TiO2 Hybrid Composites). Journal of The American Chemical Society, 131 17: 6040-6041. doi:10.1021/ja808277u

Author Musumeci, Anthony
Gosztola, David
Schiller, Tara
Dimitrijevic, Nada M.
Mujica, Vladimiro
Martin, Darren
Rajh, Tijana
Title SERS of Semiconducting Nanoparticies (TiO2 Hybrid Composites)
Formatted title
SERS of Semiconducting Nanoparticies (TiO2 Hybrid Composites)
Journal name Journal of The American Chemical Society   Check publisher's open access policy
ISSN 0002-7863
Publication date 2009-05
Sub-type Article (original research)
DOI 10.1021/ja808277u
Volume 131
Issue 17
Start page 6040
End page 6041
Total pages 2
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2010
Language eng
Formatted abstract
Raman scattering of molecules adsorbed on the surface of TiO2 nanoparticles was investigated. We find strong enhancement of Raman scattering in hybrid composites that exhibit charge transfer absorption with TiO2 nanoparticles. An enhancement factor up to 103 was observed in the solutions containing TiO2 nanoparticles and biomolecules, including the important class of neurotransmitters such as dopamine and dopac (3,4-dihydroxy-phenylacetic acid). Only selected vibrations are enhanced, indicating molecular specificity due to distinct binding and orientation of the biomolecules coupled to the TiO2 surface. All enhanced modes are associated with the asymmetric vibrations of attached molecules that lower the symmetry of the charge transfer complex. The intensity and the energy of selected vibrations are dependent on the size and shape of nanoparticle support. Moreover, we show that localization of the charge in quantized nanoparticles (2 nm), demonstrated as the blue shift of particle absorption, diminishes SERS enhancement. Importantly, the smallest concentration of adsorbed molecules shows the largest Raman enhancements suggesting the possibility for high sensitivity of this system in the detection of biomolecules that form a charge transfer complex with metal oxide nanoparticles. The wavelength-dependent properties of a hybrid composite suggest a Raman resonant state. Adsorbed molecules that do not show a charge transfer complex show weak enhancements probably due to the dielectric cavity effect.
Keyword Enhanced raman-spectroscopy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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Citation counts: TR Web of Science Citation Count  Cited 158 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 03 Sep 2009, 08:09:16 EST by Mr Andrew Martlew on behalf of Aust Institute for Bioengineering & Nanotechnology