Size- and shape-controlled synthesis of ZnSe nanocrystals using SeO2 as selenium precursor.
Here we report a low-cost and "green" phosphine-free route for the size- and shape-controlled synthesis of high-quality zinc blende (cubic) ZnSe nanocrystals. To avoid the use of expensive and toxic solvents such as trioctylphosphine (TOP) or tributylphosphine (TBP), SeO(2) was dispersed in 1-octadecene (ODE) as a chalcogen precursor. It has been found that the temperature and the surface ligand influenced the nucleation, the reaction speed and the formation of different shapes. Absorption spectroscopy, fluorescence spectroscopy, powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used for the characterization of the as-synthesized ZnSe nanocrystals. The size-dependent photoluminescence (PL) range of the as-prepared ZnSe nanocrystals was between 390 and 450 nm, with the PL full width at half-maximum (FWHM) well controlled between 14 and 18 nm and PL quantum yields reached up to 40% at room temperature. Moreover, this new selenium precursor can be used to form tetrapod-shaped ZnSe nanocrystals when zinc acetylacetonate was introduced as the zinc precursor with a one-pot method.
Key Laboratory for Special Functional Materials, Henan University, Kaifeng 475004, PR China.
Huaibin
H
Shen
Jin Zhong
JZ
Niu
Hongzhe
H
Wang
Xiaomin
X
Li
Lin Song
LS
Li
Xia
X
Chen
D008024:Ligands; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D011789:Quantum Theory; D018036:Selenium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D064588:Selenium Oxides; D013053:Spectrophotometry; D013696:Temperature; D014961:X-Ray Diffraction; D017967:Zinc Compounds / Q000138:chemical synthesis / Q000737:chemistry*
D008024:Ligands; D018036:Selenium Compounds; D064588:Selenium Oxides; D017967:Zinc Compounds; C044696:zinc selenide