Preparation and Characterization of ZnSe£¯5B2O3-95SiO2
Nanocomposites
Hao Haiyan,Yao Xi,Wang Minqiang
£¨Electronic Materials Research Laboratory, Key Laboratory of Education Ministry£¬Xi'an
Jiaotong University£¬Xi'an 710049£¬China£©
Abstract£ºHomogeneous and transparent gel glass with Zn,Se elements was prepared in the
room temperature by using solª²gel method. ZnSe nanocrystals were grown inª²situ in the
gel glass by properly annealing process in the CO atmosphere. Components and structures of
ZnSe nanocomposites were characterized by BET surface area, Xª²ray diffraction,
transmission electron microscopy
, et al. The optical properties of ZnSe£¯5B2O3-95SiO2
nanocomposites were investigated by UVª²vis absorption spectrum and photoluminescence
(PL) spectra. As a result, ZnSe nanocrystals could be dispersed effectively in the
mesostructure of solª²gel glass, which were shaped like a sphere with about 3ª±5 nm in
diameter. Compared to the ZnSe bulk materials, the absorption edge of the nanocomposites
shifted to shorter wavelength in UVª²vis spectrum. With increasing ZnSe molar ratio in
the nanaocomposites, the magnitude of blueª²shift became smaller due to quantum size
effect mainly, at the same time, the size of ZnSe nanocrystal became larger. The bands of
emission at about 500 nm were originated from recombination of the surface state and
defects of ZnSe nanocrystals in the PL spectrum. The fluorescence quenching was observed
as ZnSe molar ratio up to 0.07.
Keywords£ºzinc selenide; nanocomposites; gel glass; porous structure; optical property