Synthesis and optical properties of linker-free TiO2/CdSe nanorods

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

doi:10.1021/jp411830u

Synthesis and optical properties of linker-free TiO₂/CdSe nanorods

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

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Linker-free TiO₂/CdSe hybrid nanorods (NRs) were prepared by growing CdSe QDs in the presence of TiO₂ NR seeds using seeded-growth type colloidal injection approach. TEM studies revealed the abundant formation of anatase TiO₂ NRs with different lengths. We found that the as-prepared TiO₂ 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 TiO₂/CdSe NRs, the bleach dynamics of TiO₂/CdSe NRs is similar to that of CdSe NRs. It suggests that while surface traps that arise from the lattice mismatch between CdSe and TiO₂ are mainly observed in transient absorption measurements the ultrafast exciton dissociation over the experimental time resolution occurs in TiO₂/CdSe NRs.

Original language	English (US)
Pages (from-to)	3347-3358
Number of pages	12
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	6
DOIs	https://doi.org/10.1021/jp411830u
State	Published - Feb 13 2014
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp411830u

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title = "Synthesis and optical properties of linker-free TiO2/CdSe nanorods",

abstract = "Linker-free TiO2/CdSe hybrid nanorods (NRs) were prepared by growing CdSe QDs in the presence of TiO2 NR seeds using seeded-growth type colloidal injection approach. TEM studies revealed the abundant formation of anatase TiO2 NRs with different lengths. We found that the as-prepared TiO2 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 TiO2/CdSe NRs, the bleach dynamics of TiO2/CdSe NRs is similar to that of CdSe NRs. It suggests that while surface traps that arise from the lattice mismatch between CdSe and TiO2 are mainly observed in transient absorption measurements the ultrafast exciton dissociation over the experimental time resolution occurs in TiO2/CdSe NRs.",

author = "Yasser Hassan and Chuang, {Chi Hung} and Yoichi Kobayashi and Neil Coombs and Sandeep Gorantla and Botton, {Gianluigi A.} and Winnik, {Mitchell A.} and Clemens Burda and Scholes, {Gregory D.}",

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doi = "10.1021/jp411830u",

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journal = "Journal of Physical Chemistry C",

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TY - JOUR

T1 - Synthesis and optical properties of linker-free TiO2/CdSe nanorods

AU - Hassan, Yasser

AU - Chuang, Chi Hung

AU - Kobayashi, Yoichi

AU - Coombs, Neil

AU - Gorantla, Sandeep

AU - Botton, Gianluigi A.

AU - Winnik, Mitchell A.

AU - Burda, Clemens

AU - Scholes, Gregory D.

PY - 2014/2/13

Y1 - 2014/2/13

N2 - Linker-free TiO2/CdSe hybrid nanorods (NRs) were prepared by growing CdSe QDs in the presence of TiO2 NR seeds using seeded-growth type colloidal injection approach. TEM studies revealed the abundant formation of anatase TiO2 NRs with different lengths. We found that the as-prepared TiO2 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 TiO2/CdSe NRs, the bleach dynamics of TiO2/CdSe NRs is similar to that of CdSe NRs. It suggests that while surface traps that arise from the lattice mismatch between CdSe and TiO2 are mainly observed in transient absorption measurements the ultrafast exciton dissociation over the experimental time resolution occurs in TiO2/CdSe NRs.

AB - Linker-free TiO2/CdSe hybrid nanorods (NRs) were prepared by growing CdSe QDs in the presence of TiO2 NR seeds using seeded-growth type colloidal injection approach. TEM studies revealed the abundant formation of anatase TiO2 NRs with different lengths. We found that the as-prepared TiO2 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 TiO2/CdSe NRs, the bleach dynamics of TiO2/CdSe NRs is similar to that of CdSe NRs. It suggests that while surface traps that arise from the lattice mismatch between CdSe and TiO2 are mainly observed in transient absorption measurements the ultrafast exciton dissociation over the experimental time resolution occurs in TiO2/CdSe NRs.

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ER -

Synthesis and optical properties of linker-free TiO₂/CdSe nanorods

Abstract

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