Search academic texts

Information × Registration Number 0213U003713, 0110U006230 , R & D reports Title Invesetigation of optical properties and tunnel processes of carriers (excitons) in two-phases semiconductors nanosystem of type "core@shell" C1@C2 (С1 = SiO2, C2 = ZnO, CdS, ZnSe, ZnS and other) that are promising blocks for materials of nanophysics and electronics. popup.stage_title Head Brodyn M.S., Registration Date 27-02-2013 Organization Institute of physics NASU popup.description2 For period covered studied features of phase formation and crystallizations of ZnO at thermal decomposition of nitrate of zinc in mezoporous, spherical particles of rare-earth oxide of Y2О3 by a diameter from 70 to 400 nm. Above all things the method of low temperature thermolysis of amorphous prekursora is get mezoskopicheskie matrices are monodispersible spherical particles of Y2О3 in the range of diameters of 70-400 nm with general porosity about 50%. The results of researches of morphology of pores rotined that the pores of particles of Y2О3 had a spherical form with characteristic sizes 2-3 and 35-45 nm. Are optimum concentrations (0,01-0,1 mol/l) and temperature (T = 60 C) of solution of prekursora of Zn(NO3)2?6H2O for intercalation in the pores of Y2О3 of spheres with subsequent thermolysis for forming of separate nanocrystals of ZnO in pores with the maintainance of morphological properties of initial spheres. Certainly sequence of chemical transformations to prekursoru of Zn(NO3)2?6H2O in pores in the process of thermolysis and temperature interval of crystallization of oxide of zinc (600-800 C) in a polycrystalline structure with hexagonal symmetry of crystalline grate and linear dependence of parameters of grate from the temperature of annealing. The temperature area (600-800 C) of existence of phase of oxide of zinc of stoichiometrical composition is experimentally certain in the pores of spheres Y2О3, increases of temperature of annealing of composite nanopowder, results in violation of stoichiometry of phase of oxide through active diffusive processes on an interface and fumes of oxygen from the surface of nanocrystals of ZnO. Got standards of tapes on the quartz linings on the basis of heteroparticles "core-shell" and composite particles of Y2О3- ZnO. As from the previous stage there are a few obscure questions, in particular on dependence of energy of excitons on the size of coverage of surface of heteroparticles, on this stage we continued research of the system colloid of heteroparticles "core-shell" of SiO2/quantum dots of CdS with the radius of core of Rk ~ 150 nm and size of quantum dots ~ 2-10 nm and by the different density of their filling of surface of core of SiO2. Their compaction is to that end conducted on the modified substrate from a quartz by the method of low temperature crystallization from fusion. The directed change of diameter of nanocrystals was carried out addition of stabilizator. The modes of compaction are exhaust of heteroparticles "core-shell" in tapes in thick to 7 mkm spraying on heat quartz substrate. Product Description popup.authors Єрмолаєва Юлія Володимирівна Бондар Микола Володимирович Бродин Михайло Семенович Матвєєвська Неоніла Анатолієвна Толмачов Олександр Володимирович popup.nrat_date 2020-04-02 Close