Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: CdSe/TiO2 core-shell nanoparticles produced in AOT reverse micelles: applications in pollutant photodegradation using visible light | Fontes Garcia et al. Nanoscale Research Letters 2011 6 426 http content 6 1 426 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access CdSe TiO2 core-shell nanoparticles produced in AOT reverse micelles applications in pollutant photodegradation using visible light Arlindo M Fontes Garcia Marisa SF Fernandes and Paulo JG Coutinho Abstract CdSe quantum dots with a prominent band-edge photoluminescence were obtained by a soft AOT water-in-oil w o microemulsion templating method with an estimated size of nm. The CdSe particles were covered with a TiO2 layer using an intermediate SiO2 coupling reagent by a sol-gel process. The resulting CdSe TiO2 core shell nanoparticles showed appreciable photocatalytic activity at l 405 nm which can only originate because of electron injection from the conduction band of CdSe to that of TiO2. Introduction Over the last decade nanostructured semiconductor materials have been the focus of intense research efforts 1 . The striking feature of a nanometric solid is that conventionally detectable properties are no longer constant but are tuneable by simply controlling its shape and size and this has originated a revolution in materials science and device technology. Their photophysics shows high luminescence with tuneable emission maxima and narrow bandwidth. Semiconductor nanocrystals CdSe ZnS etc. metallic nanocrystals Ag Au etc. and magnetic nanocrystals Ni Fe3O4 etc. can be prepared by templating with the aqueous cavities existent in self-organized structures of water-in-oil w o microemulsions 2 . The main aspects that control the structure of these nanoparticulate systems are the nucleation and growth processes which are determined by the microemulsions dynamics the interaction between nanoparticle surface and surfactant molecules and if needed by the presence of metal-complexing agents. Core-shell nanoparticles CdSe ZnS have also been prepared by templating techniques 2 opening the .
