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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10 nm.计算出尺寸大小为10 nm,13 nm的纳米晶的三阶非线性光学折射率γ(-1.08×10-15,-9.08×10-17 m2·W-1),三阶非线性光学吸收系数β(6.5×10-9,3.69×10-11 m·W-1)以及三阶非线性光学极化率χ(3)(1.49×10-9,4.35×10-10 esu).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。
Monodispersed Cu2ZnSnS4 (CZTS) nanocrystals were synthesized by one-pot method using copper acetylacetonate, zinc acetate, stannous chloride, oleyl amine and sulfur powder as precursors. The obtained samples were characterized by X-ray powder diffraction EDS, TEM, HRTEM, XPS, UV-vis and Z- Scanning technique was used to characterize the structure, morphology and properties of the hexagonal CZTS nanoparticles. The results showed that the obtained product was hexagonal CZTS nanoparticles with a diameter of about 10 nm and a size of 10 nm, The third-order nonlinear optical refractive index γ (-1.08 × 10-15, -9.08 × 10-17 m2 · W-1) and the third-order nonlinear optical absorption coefficient β (6.5 × 10-9, 3.69 × 10-11 m · W-1) and the third-order nonlinear optical susceptibilities χ (3) (1.49 × 10-9 and 4.35 × 10-10 esu). The possible formation mechanism of CZTS nanocrystals was also discussed. And causes the third-order optical nonlinearity to change.