Ultrasound‐assisted bulk synthesis of Cds‐PVK nanocomposites via RAFT polymerization

With the development of advanced synthetic, spectroscopic, and device fabrication techniques in nanoscience, the performance of most of the optoelectronic and photonic devices, for example, nanocrystalline photovoltaic cells, photo-electrochromic devices, LEDs, tunable lasers, and optical limiters, may be significantly improved by incorporating nanotechnology during the materials synthesis and device fabrication. As one of the most investigated promising inorganic semiconductive materials, CdS nanoparticles exhibit outstanding properties including high carrier generation efficiency and mobility, broad absorption spectra, discreet energy bands, and narrow emission profiles as well. The practical application of these nanoparticles would inevitably involve incorporating the CdS unites into some form of a single layered or, multilayered solid-state entity. Embedding them as inclusions in a polymer host to form a composite material would allow traditional methods such as spin casting to be employed to produce suitable films for these solidstate applications. For the polymer/CdS nanoblends, a partial incompatibility of CdS nanoparticles and polymer matrices usually leads to difficulties in achieving homogeneous dispersions and ultimately phase separation at high loadings. Distortion of the conjugation and coplanarity of the polymer backbones and an increase of the interchain distance in these systems would hinder both intraand interchain charge transfer or energy transfer processes, leading to a lower device performance. A convenient route to restrain phase separation is linking soluble polymer or oligomer and prefunctionalized CdS nanoparticles via a covalent bond. Our current interest is designing and synthesizing CdS-PVK nanocomposites in which two components were directly connected with a covalent bond. Poly(N-vinylcarbozole) (PVK) is a wellknown good hole transporting material widely used for the fabrication of some optoelectronic devices, for example, photoconductors, PLED, and organic solar cells. The fabrication of nanocomposites by covalent inclusion of inorganic nanoparticles, for example, CdS, in an organic polymer matrix is highly topical and may find applications in the electronics, optics, and energy sectors. To date, only a few of literatures concern the synthesis of CdS nanoparticles chemically modified PVK functional materials. Incorporation of CdS nanoparticles into the PVK and its derivatives matrices could be expected to display improved or enhanced optoelectronic and optical properties. In this contribution, we developed a new viable and versatile synthetic method to prepare CdS-PVK Correspondence to: Y. Chen (E-mail: chentangyu@yahoo. com) or H. Zhan (E-mail: hbzhan@fzu.edu.cn)