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Constraints in post-synthesis ligand exchange for hybrid organic (MEH-PPV)–inorganic (CdSe) nanocomposites

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Abstract

For an optimum charge/energy transfer performance of hybrid organic–inorganic colloidal nanocrystals for applications such as photonic devices and solar cells, the determining factors are the distance between the nanocrystal and polymer which greatly depends upon nanocrystal size/nanocrystal ligands. Short chain ligands are preferred to ensure a close contact between the donor and acceptor as a result of the tunnelling probability of the charges and the insulating nature of long alkyl chain molecules. Short distances increase the probability for tunnelling to occur as compared to long distances induced by long alkyl chains of bulky ligands which inhibit tunnelling altogether. The ligands on the as-synthesized nanocrystals can be exchanged for various other ligands to achieve desirable charge/energy transfer properties depending on the bond strength of the ligand on the nanocrystal compared to the replacement ligand. In this work, the constraints involved in post-synthesis ligand exchange process have been evaluated, and these factors have been tuned via wet chemistry to tailor the hybrid material properties via appropriate selection of the nanocrystal capping ligands. It has been found that both oleic acid and oleylamine (OLA)-capped cadmium selenide (CdSe) quantum dots (QDs) as compared with trioctylphosphine oxide (TOPO)-passivated CdSe QDs are of high quality, and they provide better steric stability against coagulation, homogeneity, and photostability to their respective polymer:CdSe nanocomposites. CdSe QDs particularly with OLA capping have relatively smaller surface energies, and thus, lesser quenching capabilities show dominance of photoinduced Forster energy transfer between donors (polymer) and acceptors (CdSe nanocrystals) as compared to charge transfer mechanism as observed in polymer:CdSe (TOPO) composites. It is conjectured that size quantization effects, stereochemical compatibility of ligands (TOPO, oleic acid, and oleyl amine), and polymer MEH-PPV stability greatly influence the photophysics and photochemistry of hybrid polymer–semiconductor nanocomposites.

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Acknowledgments

The authors are grateful to the Director, National Physical Laboratory, New Delhi (India) for his kind support. We are thankful to CSIR-India for TAP-SUN program. AM and PC are thankful to MNRE, Govt. of India for financial support.

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Authors and Affiliations

  1. CSIR-Network of Institutes for Solar Energy, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi, 110 012, India

    Aarti Mehta, Shailesh N. Sharma, Parul Chawla & Suresh Chand

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  1. Aarti Mehta
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  2. Shailesh N. Sharma
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  3. Parul Chawla
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  4. Suresh Chand
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Correspondence to Shailesh N. Sharma.

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Mehta, A., Sharma, S.N., Chawla, P. et al. Constraints in post-synthesis ligand exchange for hybrid organic (MEH-PPV)–inorganic (CdSe) nanocomposites. Colloid Polym Sci 292, 301–315 (2014). https://doi.org/10.1007/s00396-013-3073-z

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  • DOI: https://doi.org/10.1007/s00396-013-3073-z

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