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Studies of optical and structural properties of CdSe/polymer nanocomposites: evidence of charge transfer and photostability

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Abstract

In this work, the role of conducting [poly (p-phenylinevinylene) (PPV)] and nonconducting (polystyrene) polymers on the properties of their respective composites with CdSe quantum dots of varied sizes has been investigated. The emission and structural properties of polymer–CdSe composites are found to be dependent on the crystallite size and morphology of CdSe nanocrystallites. Smaller CdSe quantum dots (size, ∼5 nm) ensures efficient charge transfer process across polymer–CdSe interface as evident by almost complete quenching of photoluminescence (PL) emission as compared to larger CdSe quantum dots (size, ∼7 nm). Presence of residual trioctylphosphine (TOP)/ tri-n-octylphosphine-oxide (TOPO) species and agglomeration of particles act as a hindrance for quenching of emission and hence charge transfer for larger CdSe nanocrystallites. Emission studies indicated an increased conjugation length for PPV polymers in different solvents (toluene, pyridine) and in solid state. Nonconducting polymer polystyrene shows charge transfer across polymer–CdSe interface as well. However, polystyrene polymer has a shorter chain length, which ensures maximum coverage on the surface of CdSe nanocrystallites and provides better photostability to CdSe QDs within the polymer matrix as compared to that for PPV–CdSe nanocomposites.

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Acknowledgments

We thank Director NPL for the encouragement to perform this work. The financial assistance from the Department of Science and Technology, New Delhi is gratefully acknowledged. Dr. SK Dhawan (Polymer Group, NPL) is greatly acknowledged for providing PPV and for his interest in this work.

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Authors and Affiliations

  1. Electronic Materials Division, National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110 012, India

    Himani Sharma, Shailesh N. Sharma & Sonnada Math Shivaprasad

  2. Department of Chemistry, University of Delhi, Delhi, 110 007, India

    Himani Sharma & Gurmeet Singh

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  1. Himani Sharma
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  2. Shailesh N. Sharma
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  4. Sonnada Math Shivaprasad
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Correspondence to Shailesh N. Sharma.

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Sharma, H., Sharma, S.N., Singh, G. et al. Studies of optical and structural properties of CdSe/polymer nanocomposites: evidence of charge transfer and photostability. Colloid Polym Sci 285, 1213–1227 (2007). https://doi.org/10.1007/s00396-007-1674-0

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  • DOI: https://doi.org/10.1007/s00396-007-1674-0

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