Synthesis and optical properties of linker-free TiO 2 /CdSe nanorods

Yasser Hassan, Chi Hung Chuang, Yoichi Kobayashi, Neil Coombs, Sandeep Gorantla, Gianluigi A. Botton, Mitchell A. Winnik, Clemens Burda, Gregory D. Scholes

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13 Scopus citations

Abstract

Linker-free TiO 2 /CdSe hybrid nanorods (NRs) were prepared by growing CdSe QDs in the presence of TiO 2 NR seeds using seeded-growth type colloidal injection approach. TEM studies revealed the abundant formation of anatase TiO 2 NRs with different lengths. We found that the as-prepared TiO 2 seeds determined the morphology of TiO 2 /CdSe NRs. The photophysics of these materials were studied by photoluminescence (PL) and femtosecond transient absorption spectroscopy. While we observed the efficient PL quenching in TiO 2 /CdSe NRs, the bleach dynamics of TiO 2 /CdSe NRs is similar to that of CdSe NRs. It suggests that while surface traps that arise from the lattice mismatch between CdSe and TiO 2 are mainly observed in transient absorption measurements the ultrafast exciton dissociation over the experimental time resolution occurs in TiO 2 /CdSe NRs.

Original languageEnglish (US)
Pages (from-to)3347-3358
Number of pages12
JournalJournal of Physical Chemistry C
Volume118
Issue number6
DOIs
StatePublished - Feb 13 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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    Hassan, Y., Chuang, C. H., Kobayashi, Y., Coombs, N., Gorantla, S., Botton, G. A., Winnik, M. A., Burda, C., & Scholes, G. D. (2014). Synthesis and optical properties of linker-free TiO 2 /CdSe nanorods Journal of Physical Chemistry C, 118(6), 3347-3358. https://doi.org/10.1021/jp411830u