In-situ GISAXS on Nanocomposite Films of CdS Nanoparticles and Polymers
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1027-D05-02
In-situ GISAXS on Nanocomposite Films of CdS Nanoparticles and Polymers Tiziana Di Luccio1, Dina Carbone2, Anna Maria Laera3, Katrin Peeper4, Christian Mauser4, and Enrico Da Como4 1 Italian National Agency for New Technologies, Energy and the Environment (ENEA), FIMMATNANO, Via Vecchio Macello, Portici, 80055, Italy 2 European Synchrotron Radiation Facility (ESRF), 6 rue Jules Horowitz, Grenoble, 38000, France 3 Italian National Agency for New Technologies, Energy and the Environment (ENEA), FIMMATCOMP, Strada Statale 7 Appia, Brindisi, 72100, Italy 4 Photonics and Optoelectronis Group, Dep. of Physics and CeNS Ludwig-MaximiliansUniversitaet, Amalienstr. 54, Munich, 80799, Germany ABSTRACT We investigated the growth of CdS nanoparticles in polymer films by means of ex-situ and in-situ x-ray scattering experiments using synchrotron radiation. The CdS nanoparticles were synthesized by thermal decomposition of a Cd thiolate precursor dispersed in a cyclic olefin copolymer. The films were deposited by spin coating. Grazing incidence diffraction (GID) reveals the Bragg reflections of the CdS nanoparticles. In-situ diffraction and grazing incidence small angle scattering (GISAXS) experiments were recorded during the thermal treatment of the precursor/polymer films from room temperature up to 250°C. The diffraction curves show that the initial precursor structure is soon lost at 100°C. Correspondingly, the GISAXS data show a peak at a momentum transfer value q ~ 0.2Å-1 that shifts towards smaller values with the temperature. Under UV excitation the films show photoluminescence in the range 400 – 700 nm. INTRODUCTION Organic-inorganic nanocomposites such as semiconducting nanoparticles dispersed in polymers are of wide interest for applications in novel devices [1]. Organic light emitting devices can benefit from the tunable color luminescence of the inorganic nanoparticles [2] and their performance and lifetime can be ultimately improved by a homogeneous dispersion of the particles in the organic material [3]. Polymers filled with inorganic nanoparticles are promising gas sensors [4] or temperature sensors [5]. For such devices very thin layers are often required [3] with a homogeneous dispersion of the nanoparticles within the matrix. X-ray grazing incidence scattering methods such as in-plane diffraction (GID) and small angle scattering (GISAXS) are ideal methods to study crystallinity, size, strain and spatial distribution of small particles on a substrate, with depth resolution [6]. Moreover the availability of synchrotron radiation sources with high brilliance allows to get an appreciable signal from the small number of scatterers in such nanocomposite systems. Our research is focused on nanocomposites of CdS nanoparticles and polymeric materials for organic electronics and sensor applications. The CdS nanoparticles were synthesized by thermal decomposition of a Cd thiolate precursor dispersed in a cyclic olefin copolymer (topas) [7]. Two kinds of samples were prepared from the precursor/polymer solution
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