In situ growth of well-dispersed CdS nanocrystals in semiconducting polymers

TitleIn situ growth of well-dispersed CdS nanocrystals in semiconducting polymers
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2013
AuthorsLaera, A.M., Resta V., Piscopiello E., Miceli V., Schioppa M., Scalone Anna Grazia, Di Benedetto F., and Tapfer L.
JournalNanoscale Research Letters
Keywords1-methylimidazole, Cadmium, Cadmium sulfide, CdS nanocrystals, Different precursors, Emission spectroscopy, Emission spectrums, Energy conversion, Hybrid nanocomposites, Nanocomposites, Nanocrystals, Photoluminescence peak, Photoluminescence spectroscopy, Polymer absorption, Polymers, Solar energy, Synthesis (chemical), Synthetic routes, Transmission electron microscopy

A straight synthetic route to fabricate hybrid nanocomposite films of well-dispersed CdS nanocrystals (NCs) in poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) is reported. A soluble cadmium complex [Cd(SBz)2]2·MI, obtained by incorporating a Lewis base (1-methylimidazole, MI) on the cadmium bis(benzyl)thiol, is used as starting reagent in an in situ thermolytic process. CdS NCs with spherical shape nucleate and grow well below 200°C in a relatively short time (30 min). Photoluminescence spectroscopy measurements performed on CdS/MEH-PPV nanocomposites show that CdS photoluminescence peaks are totally quenched inside MEH-PPV, if compared to CdS/PMMA nanocomposites, as expected due to overlapping of the polymer absorption and CdS emission spectra. The CdS NCs are well-dispersed in size and homogeneously distributed within MEH-PPV matrix as proved by transmission electron microscopy. Nanocomposites with different precursor/polymer weight ratios were prepared in the range from 1:4 to 4:1. Highly dense materials, without NCs clustering, were obtained for a weight/weight ratio of 2:3 between precursor and polymer, making these nanocomposites particularly suitable for optoelectronic and solar energy conversion applications. © 2013 Laera et al.; licensee Springer.


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