Sambasivam S, Sathyaseelan B, Raja Reddy D, Reddy B K, Jayasankar C K
Department of Physics, Sri Venkateswara University, Tirupati 517502, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Dec 15;71(4):1503-6. doi: 10.1016/j.saa.2008.05.009. Epub 2008 May 17.
Nanoparticles of Zn1-xCuxS with Cu concentrations of x=0.0, 0.1, 0.2, 0.3 and 0.4 were prepared by a co-precipitation reaction method from homogeneous solutions of zinc and copper salts. Both the ZnS and ZnS:Cu nanoparticles excited at about 370 nm exhibits a broad green emission band peaking around 491 nm, which confirms the characteristic feature of Zn2+ as well as Cu2+ ions as luminescent centers in the lattice. The TEM micrographs showed spherical morphology for ZnS nanocrystals and the average size of the particles was estimated to be around 8.5 nm. At liquid nitrogen temperature, ESR signal characteristic of Cu2+ ions was observed in samples of all concentrations. ESR spectra analysis also indicated that Cu2+ ions enter the host lattice by replacing Zn2+ ions with distorted tetrahedral site symmetry.
通过共沉淀反应法，从锌盐和铜盐的均匀溶液中制备了铜浓度x = 0.0、0.1、0.2、0.3和0.4的Zn1-xCuxS纳米颗粒。在约370 nm激发下，ZnS和ZnS:Cu纳米颗粒均呈现出一个宽的绿色发射带，其峰值约为491 nm，这证实了晶格中作为发光中心的Zn2+以及Cu2+离子的特征。透射电子显微镜图像显示ZnS纳米晶体呈球形形态，颗粒的平均尺寸估计约为8.5 nm。在液氮温度下，在所有浓度的样品中均观察到了Cu2+离子的电子自旋共振（ESR）信号特征。ESR光谱分析还表明，Cu2+离子通过取代具有扭曲四面体位置对称性的Zn2+离子进入主体晶格。
