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PS/ZnO nanocomposite

The TEM, high-resolution TEM and FESEM images of ZnO nanoparticles and FESEM images of PS/ZnO nanocomposite films (Figure 12.9) show the surface morphology. The average particle diameters determined from the XRD peaks using the Debye-Scherrer formula are found to be close to those based on TEM and FESEM analysis. [Pg.469]

Figure 12.10 UV-visible absorption spectra of PS and PS/ZnO nanocomposite films. Figure 12.10 UV-visible absorption spectra of PS and PS/ZnO nanocomposite films.
Figure 12.8 PL emission spectra of (i) ZnO and (ii) PS andPS/ZnO nanocomposite films (a, b and c - PS/ZnO composite films with 5,10, and 20 wt% of ZnO, respectively). Figure 12.8 PL emission spectra of (i) ZnO and (ii) PS andPS/ZnO nanocomposite films (a, b and c - PS/ZnO composite films with 5,10, and 20 wt% of ZnO, respectively).
The preparation of ZnO/ PS nanocomposites preceded as follows [112] First, 110 mg bare ZnO or 110 mg PMMA-grafted ZnO were added into a three-necked bottle. Then, 10 mL styrene was added into the reactor. The mixture was stirred with the aid of ultrasonic oscillation until a uniform dispersion of the ZnO particles in styrene was attained. Afterwards, 36 mg azobisisobutyronitrile (AIBN) was added into the reactor as initiator. The subsequent polymerization was conducted at 85°C for 2.5 h. Then, the obtained composites were dried under vacuum for 24 h. The differential scanning calorimetry (DSC) heating curves of neat PS, PS/ZnO (bare), and PS/ZnO (PMMA grafted) are shown in Fig. 10. DSC traces in Fig. 10a show that neat PS has a lower glass transition temperature (Tg = 87.7°C) than PS/ZnO (bare, 7 g = 97.9°C) and PS/ZnO (PMMA grafted, Tg = 95.3°C). This behavior can be explained by the restricting effect of the nanoparticles in polymer. ZnO... [Pg.24]

Zhang JJ, Gao G, Zhang M, et al. (2006) ZnO/PS core-shell hybrid microspheres prepared with miniemulsion polymerization. J Colloid Interface Sci 301 78-84 Mahdavian A, Stirrafi Y, Shabankareh M (2009) Nanocomposite particles with core-shell morphology. 111. Preparation and characterization of nano Al203-poly(styrene-methyl methacrylate) ptirticles via miniemulsion polymerization. Polym Bull 63 329-340... [Pg.44]

The fascinating properties exhibited by nanoparticles, such as blue shift of the absorption spectrum, size-dependent luminescence, etc., are various manifestations of the so-called quantum confinement effect. These unique properties make ZnO a promising candidate for applications in optical and optoelectronic devices [35-38]. Polymer-based nanocomposites are the subject of considerable research due to the possibility of combining the advantages of both polymers and nanoparticles. There are several applications of polymeric nanocomposites based on their optical, electrical and mechanical properties. Further, nanocrystals dispersed in suitable solid hosts can be stabilized for long periods of time. Polystyrene (PS)— an amorphous, optically clear thermoplastic material, which is flexible in thin-film form—is often chosen as a host matrix because of its ideal properties for investigating optical properties. It is one of the most extensively used plastic materials, e.g., in disposable cutlery, plastic models, CD and DVD cases, and smoke-detector housings. [Pg.466]

A reverse PET, namely photoinduced charge injection from an electronically excited chromophore to a semiconductor surface, is typically the initial step in dye-sensitized solar cells (DSSCs) of the Gratzel-type, for example, with a trinuclear ruthenium dye 51 (Figure 20.11a) [69]. Such a PET step, reminiscent of the charge separation in DSSCs or in PS II, has been visualized by Kelvin probe force microscopy on a donor-chromophore-acceptor nanocomposite poly[TPA-Ru (tpy)2] ZnO (tpy, 2,2 6, 2"-terpyridine) 52 prepared from a ZnO-immobilized [Ru (tpy)2] chromophore (Figure 20.11b, TPA, tripheny-lamine) [70]. In 52, both the electron acceptor (ZnO) and the electron donor (TPA) are assembled in a directional manner to assist the charge separation step... [Pg.440]


See other pages where PS/ZnO nanocomposite is mentioned: [Pg.466]    [Pg.466]    [Pg.467]    [Pg.470]    [Pg.470]    [Pg.471]    [Pg.256]    [Pg.263]    [Pg.466]    [Pg.466]    [Pg.467]    [Pg.470]    [Pg.470]    [Pg.471]    [Pg.256]    [Pg.263]    [Pg.641]    [Pg.468]    [Pg.469]    [Pg.469]    [Pg.262]    [Pg.268]    [Pg.24]    [Pg.259]    [Pg.68]    [Pg.221]    [Pg.251]   


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PS nanocomposites

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