CuInS_2纳米晶的结构、形貌与光学性能研究

Structure,Morphology and Optical Properties of CuInS_2 Nanocrystals

采用A-Pot法,以乙酰丙酮铜[Cu(acac)2]为铜源,硬脂酸铟[In(St)3]为铟源,正十二硫醇(DDT)为硫源和稳定剂,1-十八烯(ODE)为溶剂,在250℃条件下,反应50 min,合成了CuInS2粉体.用X射线粉末衍射仪(XRD)、透射电子显微镜(TEM)、能量分散光谱仪(EDS)、X射线光电子能谱(XPS)等对粉体的结构、形貌、相组成进行表征.结果表明:产物为四角晶系的黄铜矿结构,棒状CuInS2纳米晶的直径为2 nm,长约70 nm.通过Z-Scan技术对分散在正己烷中CuInS2纳米棒的三阶光学非线性进行测试,在入射波长为770 nm的条件下,得出三阶光学非线性折射率γ、三阶光学非线性吸收系数β以及三阶光学非线性极化率χ(3)分别为1.76×10-17m2/W,7.95×10-11m/W和8.60×10-12esu.

Cu-In-S nanocrystals（CIS NCs） were prepared by thermolysis of a mixed solution of copper（II） acetylacetonate [Cu（acac）2],indium stearate [In（St）3],and dodecanethiol（DDT） in noncoordinating solvent 1-octadecene（ODE） at 250 ℃ for 50 min.The diameter of rod-like CuInS2 nanocrystals was about 2 nm,and the length of 70 nm.The microstructure of CIS NCs was determined to be of the tetragonal phase.The microstructure,morphology,and phase constituents of the CIS NCs were examined using diverse techniques including X-ray diffraction（XRD）,transmission electron microscopy（TEM）,energy dispersive X-ray spectroscopy（EDS）,and X-ray photoelectron spectroscopy（XPS）.The third-order optical nonlinearities of rod-like CIS NCs in n-hexane were studied by Z-scan technique at a wavelength of 770 nm.The results showed that the third-order optical nonlinear refractive index γ,absorption coefficient β,and susceptibility χ（3） were determined to be 1.76×10-17 m2/W,7.95×10-11 m/W,and 8.60×10-12 esu,respectively.