以乙酰丙酮铜、醋酸锌、二氯亚锡、油胺和硫粉为前驱体,采用one-pot法合成出了单分散的Cu2ZnSnS4(CZTS)纳米晶.所得样品采用X射线粉末衍射仪(XRD),能量色散谱仪(EDS),透射电子显微镜(TEM),高分辨透射电子显微镜(HRTEM),光电子能谱仪(XPS),紫外-可见光谱仪(UV-vis)和Z-扫描(z-scan)技术对其结构组成、形貌、性能等进行了表征.结果表明:所获得的产物为四方相结构的六边形CZTS纳米颗粒,直径约为10nm.计算出尺寸大小为10nm,13nm的纳米晶的三阶非线性光学折射率γ(-1.08X10^-15,-9.08X10^17m^2·W^-1),三阶非线性光学吸收系数β(6.5X10^-9,3.69×10^-11m·W^-1)以及三阶非线性光学极化率X^(3)(1.49×10^-9,4.35×10^-10esu).并探讨了CZTS纳米晶可能的形成机理,及引起三阶光学非线性发生变化的原因.
Monodisperse CUEZnSnS4 (CZTS) nanocrystals were synthesized by one-pot method using cop- per(Ⅱ) acetylacetonate, zinc(II) acetate, tin(II) chloride, S powder and oleylamine as precursors. The compo- sition, structure, morphology and properties of the CZTS were characterized by X-ray diffraction (XRD), energy dispersive X-ray (EDS), transmission electron microscopy (TEM), high-resolution transmission elec- tron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-vis and Z-scan technology. The results showed that the as-prepared CZTS nanocrystals were tetragonal phase with hexagonal shape and par- ticle size about 10 nm. The nonlinear refraction index γ(- 1.08×10^-15, -9.08× 10^-17 m^2·W^-l), nonlinear absorption coefficientβ (6.5 ×10^-9, 3.69×10^-11 m·W^-1) and third-order optical susceptibility X^(3) (1.49 × 10^- 9, 4.35× 10^-10esu) ofCZTS nanocrystals with different size (10 nm, 13 nm) were calculated. Finally, the growth mechanism ofnanocrystals and the nonlinear optical properties were investigated.