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SERS of semiconducting nanoparticles (TiO2Hybrid composites)
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Musumeci, Anthony, Gosztola, David, Schiller, Tara L., Dimitrijevic, Nada M., Mujica, Vladimiro, Martin, Darren J. and Rajh, Tijana (2009) SERS of semiconducting nanoparticles (TiO2Hybrid composites). Journal of the American Chemical Society, Volume 131 (Number 17). pp. 6040-6041. doi:10.1021/ja808277u ISSN 0002-7863.
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Official URL: http://dx.doi.org/10.1021/ja808277u
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.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
Journal or Publication Title: | Journal of the American Chemical Society | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0002-7863 | ||||
Official Date: | 2009 | ||||
Dates: |
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Volume: | Volume 131 | ||||
Number: | Number 17 | ||||
Page Range: | pp. 6040-6041 | ||||
DOI: | 10.1021/ja808277u | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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