Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Preparation of PPV/AuNPs Nanocomposite by Two Different In-situ Methods and Study on Their Fluorescence and Photovoltaic Properties

Author ZhanSuMei
Tutor HuangZongHao;SunHaiZhu
School Northeast Normal University
Course Polymer Chemistry and Physics
Keywords in-situ PPV AuNPs nanocomposite
CLC TB383.1
Type Master's thesis
Year 2011
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Nanomaterials are received much attention due to their excellent properties in optical, electrical and magnetic properties. There are many reports about incorporating nanoparticles into polymer matrix and investigating on the interaction between them. They find that Au nanoparticles (AuNPs) can influence the chemical and physical properties of conductive polymer. Properties of the composite are also affected by preparing methods and routes. Poly(phenylene vinylene) (PPV) is an excellent conductive polymer. Its rigid structure makes it almost insoluble in any solvent, which brings difficulties to preparation and processing of PPV’s nanocomposites. So we always prepare the PPV precursor (PPVpre) composite, and then convert into PPV composite at high temperature. However, PPVpre is sensitive to many solvents and inorganic and organic substances. The cis, trans and cisoid structure of PPVpre in solution may affect the distribution of nanoparticles. Some nonfunctional materials may affect the generation of exciton and transport of hole. Therefore, choosing a suitable method or route for preparation of PPV composite is very important.In this text, we prepared PPV/AuNPs nanocomposite by two different in-situ routes without using any ligand. Both of them obtained PPV/AuNPs nanocomposite by thermal conversion from PPVpre/AuNPs. The difference between them was the preparation of PPVpre/AuNPs. One was using NaBH4 reduce HAuCl4 in two-sulfur salt system at first, and then drop NaOH into the solution for polymerization to form PPV/AuNPs (in-situ route 1). The other was preparing AuNPs in after dialysis PPVpre (in-situ route 2).We characterized the structure, morphology, fluorescence properties and photovoltaic property. Compared the properties of PPV/AuNPs by using two different routes and discussed the possible reasons for AuNPs impact on nature of PPV. This study provides a new guidance for development of PPV in optic-electric devices.

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