Synthesis of Nanocomposite Materials with Controlled Structures and Optical Emissions: Application of Various Methacrylate Polymers for CdSe Quantum Dots Encapsulation

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Abstract:

CdSe quantum dots (QDs) were incorporated in polymer films via in situ polymerization using one of the four different monomers having a varied hydrocarbon side chain length, namely, hexyl, lauryl, stearyl, or behenyl methacrylate. This technique resulted in the preparation of a series of the QD-based nanocomposite materials for which laser scanned confocal microscopy imaging revealed a uniform dispersion of nanoparticles within the polymethacrylate matrices. Importantly, the polymer encapsulation of highly luminescent CdSe QDs did not affect their optical properties. The films exhibit the size-quantized optical effects characteristic of QDs. The changes in photoluminescence (PL) intensity of CdSe QDs were investigated as a function of illumination duration in different chemical environments, including the above polymeric matrices and a chloroform solution. Enhancement of the photoluminescence quantum yield for photoactivated QDs in methacrylate polymers was observed. This study of quantum yields of QD-based composites is important for understanding the involvement of surface states of photoactivated QDs as well for identifying ideal polymeric hosts for photoinduced surface passivation.

Keywords: CDSE QUANTUM DOTS; METHACRYLATE POLYMERS; NANOCOMPOSITES; PHOTOLUMINESCENCE; SENSORS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2099

Publication date: March 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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