Abstract
UV irradiation of materials consisting of a polymer matrix that possesses precursors of different kinds can result in creation of nanoparticles within the irradiated domains. Such photoinduced nanocomposites are promising for photonic applications due to the strong alteration of their optical properties compared to initial non-irradiated materials. We report our results on the synthesis and investigation of plasmonic, excitonic and exciton-plasmonic photoinduced nanocomposites. Plasmonic nanocomposites contain metal nanoparticles of noble metals with a pronounced plasmon resonance. Excitonic nanocomposites possess semiconductor nanoclusters (quantum dots). We consider the CdS–Au pair because the luminescent band of CdS nanoparticles enters the plasmon resonance band of gold nanoparticles. The obtaining of such particles within the same composite materials is promising for the creation of media with exciton–plasmon resonance. We demonstrate that it is possible to choose appropriate precursor species to obtain the initially transparent poly(methyl methacrylate) (PMMA) films containing both types of these molecules either separately or together. Proper irradiation of these materials by a light-emitting diode operating at the wavelength of 365 nm provides material alteration demonstrating light-induced optical absorption and photoluminescent properties typical for the corresponding nanoparticles. Thus, an exciton-plasmonic photoinduced nanocomposite is obtained. It is important that here we use the precursors that are different from those usually employed.
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Acknowledgments
The authors thank Prof. L. A. Smirnova and her co-workers E. Salomatina and I. Glasova from Nizhniy Novgorod State University for fruitful discussions. The authors also thank Russian Scientific Foundation (Grant No. 14-19-01702) for financial support.
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Bityurin, N., Ermolaev, N., Smirnov, A.A. et al. Plasmonic, excitonic and exciton-plasmonic photoinduced nanocomposites. Appl. Phys. A 122, 193 (2016). https://doi.org/10.1007/s00339-016-9706-6
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DOI: https://doi.org/10.1007/s00339-016-9706-6