不同结构CuInZnS2纳米晶的简单合成及其非线性光学特性(英文)

Facile Synthesis of CulnZnS_2 Alloyed Nanocrystals for Tunable Structure and Their Nonlinear Optical Properties

以相应的醋酸盐、硬脂酸盐和正十二硫醇为原料,以1-十八烯酸为溶剂,反应温度为260℃,反应时间为120 min的条件下,合成出高质量的纤锌矿结构和黄铜矿结构的CuInZnS_2(CIZS)纳米晶。CIZS纳米晶通过不同的测试方法进行结构和性能的表征,包括X射线粉末衍射法、荧光光谱法。X射线粉末衍射测试表明通过改变前驱体比例可以改变CIZS纳米晶结构。当Cu:In:Zn=1:1:2时可以得到黄铜矿结构CIZS纳米晶,Cu:In:Zn=2:1:1时可以得到纤锌矿结构CIZS纳米晶。纤锌矿结构CIZS纳米晶在不同的反应时间展现出不同的荧光现象,荧光发射波长从610 nm红移至710mm,说明存在纳米尺寸的效应。通过Z-Scan技术研究了纤锌矿CIZS纳米晶的三阶光学非线性折射率γ和非线性吸收系数β。由此可知,CIZS纳米晶由于具有独特的光学以及电学特性可以应用到非线性光学器件、纳米电子以及其它领域。

High-quality wurtzite and chalcopyrite CuZnInS_2(CIZS) alloy NCs have been synthesized via reaction between the acetate and stearate salts of the corresponding metals and dodecanethiol in octadecene media at 260 ℃ for 120 min.The CIZS alloy NCs have been investigated by different methods including XRD and PL.The XRD analysis revealed that CIZS NCs exhibited wurtzite and chalcopyrite with different Cu,In,and Zn ratios.The results showed that structures can be tuned conveniently via variation of the stoichiometric ratio of their components.We can got the wurtzite structure CIZS alloy with Cu:In:Zn=2:1:1 and chalcopyrite structure CIZS alloy with Cu:In:Zn=1:1:2.The wurtzite ZCIS NCs did show PL emission for different time.The PL emission wavelength of the resulting CIZS NCs can cover from 610 nm to 740 nm.Nonlinear refractive index y,and nonlinear absorption coefficient β have been investigated by Z-scan technique.Thus,CIZS NCs are expected to have special optical and electrical properties,which can be applied in nonlinear optics,nanoelectronics.and other fields.