Translated Title
Spectral Analysis of CdZnSe Ternary Quantum Dots Sensitized TiO2 Tubes and Its Application in Visible-Light Photocatalysis
Translated Abstract
In this work ,cadmium nitrate hexahydrate [Cd(NO3 )2 ?6H2 O] is as a source of cadmium ,zinc nitrate [Zn(NO3 )2 ] as a source of zinc source ,and NaHSe as a source of selenium which was prepared through reducing the elemental selenium with sodium borohydride (NaBH4 ) .Then water‐soluble Cd1 - xZnxSe ternary quantum dots with different component were prepared by colloid chemistry .The as‐prepared Cd1 - xZnxSe ternary quantum dots exhibit stable fluorescent property in aqueous solution ,and can still maintain good dispersivity at room temperature for four months .Powder X‐ray diffraction (XRD) and high resolution transmission electron microscope (HRTEM) were used to analyze crystal structure and morphology of the prepared Cd1 - xZnxSe . It is found that the as‐prepared ternary quantum dots are cubic phase ,show as sphere ,and the average of particle size is approxi‐mate 4 nm .The spectral properties and energy band structure of the as‐prepared ternary quantum dots were modulated through changing the atom ratio of elements Zn and Cd .Compared with binary quantum dots CdSe and ZnSe ,the ultraviolet‐visible (UV‐Visible) absorption spectrum and fluorescence (FL) emission spectrum of ternary quantum dots are both red‐shift .The compos‐ites (Cd0.5Zn0.5Se@ TNTs)of Cd0.5Zn0.5Se ternary quantum dots and TiO2 nanotubes (TNTs)were prepared by directly immer‐ging TNTs into quantum dots dispersive solution for 5 hours .TEM image shows that the Cd0.5 Zn0.5 Se ternary quantum dots were closely combined to nanotube surface .The infrared spectra show that the Ti‐Se bond was formed between Cd0.5Zn0.5Se ter‐nary quantum dots and TiO2 nanotubes ,which improve the stability of the composite .Compared to pristine TNTs ,UV‐Visible absorption spectrum of the composites is significantly enhanced in the visible region of light .And the absorption band edge of Cd0.5Zn0.5Se@ TNTs red‐shift from 400 to 700 nm .The recombination of the photogenerated electron‐hole pairs was restrained with the as‐prepared ternary quantum dots .Therefore ,the visible‐light photocatalytic efficiency was greatly improved .After visible‐light irradiation for 60 min ,the degradation of Cd0.5 Zn0.5 Se@ TNTs photocatalysts for RhB is nearly 100% ,which is about 3.3 times of that of pristine TNTs and 2.5 times of that of pure Cd0.5Zn0.5Se ternary quantum dots ,respectively .
Translated Keyword
CdZnSe
Photocatalysis
Ternary quantum dots
TiO2 nanotubes
Access Number
WF:perioarticalgpxygpfx201511038
