Synthesis and Optical Properties of Linker-Free TiO2/CdSe Nanorods

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• 作者：Yasser Hassan ; Chi-Hung Chuang ; Yoichi Kobayashi ; Neil Coombs ; Sandeep Gorantla ; Gianluigi A. Botton ; Mitchell A. Winnik ; Clemens Burda ; Gregory D. Scholes
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：February 13, 2014
• 年：2014
• 卷：118
• 期：6
• 页码：3347-3358
• 全文大小：644K
• ISSN：1932-7455

文摘

Linker-free TiO₂/CdSe hybrid nanorods (NRs) were prepared by growing CdSe QDs in the presence of TiO₂ NR seeds using seeded鈥揼rowth 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 TiO₂/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.