Synthesis and investigation of nonlinear optical properties of semiconductor ZnS nanoparticles

• Published in: The Journal of physics and chemistry of solids Vol. 72; no. 9; pp. 1008 - 1010
• Main Authors: Dehghani, Z., Nazerdeylami, S., Saievar-Iranizad, E., Majles Ara, M.H.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2011
• Subjects: A. Nanostructures; B. Chemical synthesis; C. X-ray diffraction; D. Optical properties; Nanoparticles; Nonlinearity; Optical properties; Refractive index; Refractivity; Semiconductors; Zinc; Zinc sulfides; B. Chemical synthesis; A. Nanostructures; C. X-ray diffraction; D. Optical properties
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2011.05.005

ZnS nanoparticles were prepared by a simple chemical method and using PVP (poly vinylpyrrolidone) as capping agent. The sample was characterized by UV–vis spectrophotometer, X-ray diffraction (XRD) and Z-scan technique. XRD pattern showed that the ZnS nanoparticles had zinc blende structure with an average size of about 2.18 nm. The value of band gap of these nanoparticles was measured to be 4.20 eV. The nonlinear optical properties of ZnS nanoparticles in aqueous solution were studied by Z-scan technique using CW He–Ne laser at 632.8 nm. The nonlinear absorption coefficient ( β) was estimated to be as high as 3.2×10 −3 cm/W and the nonlinear refractive index ( n 2) was in order of 10 −8 cm 2/W. The sign of the nonlinear refractive index obtained negative that indicated this material exhibits self-defocusing optical nonlinearity. Z-scan measurement diagram. [Display omitted] ► ZnS nanoparticles synthesized by chemical method using capping agent. ► XRD analysis showed the prepared ZnS sample had zinc blende structure. ► Sample had an excitonic peak around 295 nm in UV–vis spectra. ► Nonlinear responses of ZnS nanoparticles studied by Z-scan technique.