Photoinduced polymer coating of semiconductor nanoparticles in an aerosol process

气溶胶聚合在不需要溶剂和表面活性剂的情况下，将半导体纳米粒子(SNPs)包裹在聚合物壳层中具有很大的潜力。在这里，SNPs同时作为单体缩合的核和紫外光照射下聚合的引发剂。在项目的第一阶段，研究表明，对于聚丙烯酸丁酯，通过控制单体蒸气压，可以在不同的SNPs(二氧化钛、氧化锌、四氧化三铁)上调节聚合物外壳，在光反应器中的停留时间为20-30 S，进动在纳米范围内。此外，实验还表明，该聚合反应同样适用于空气中和火焰合成的SNPs。第二阶段研究气溶胶聚合的三个方面，即粒子性质(晶格面、粒子电荷)和单体(吸附行为)之间的相互作用，两个例子(光致发光的ZnO SNP的稳定性和TiO2SNPs的光活性的提高)的方法的应用，以及将该技术扩展到其他材料类别(如等离子体NP)。

The aerosol polymerization exhibits a great potential for the encapsulation of semiconductor nanoparticles (SNPs) with a polymer shell without the need for solvents and surfactants. Here the SNPs serve at the same time as nuclei for the condensation of the monomer and as an initiator for the polymerization under UV irradiation. In the first period of the project, it was shown that for polybutylacrylate the control of the monomer vapor pressure allows adjustingthe polymer shell on different SNPs (TiO2, ZnO, Fe3O4) with a precession in the nanometer range using residence times of 20 to 30 s in the photoreactor. In addition, it was shown that the polymerization works also in air and for flame synthesized SNPs. In the second period three aspects of aerosol polymerization should be investigated, namely the interplay between particle properties (lattice facets, particle charge) and monomer (adsorption behavior), the application of the method for two examples (stability of photoluminescent ZnO SNP and enhancement of photoactivity of TiO2 SNPs) and the extension of the technology to other material classes (e.g. plasmonic NP).