Thermo-optical characterization of CdZnS nanoparticle colloids. (April 2015)

• Record Type: Journal Article
• Authors: Jafary, Mohammad; Karimzadeh, Rouhollah; Ghasemifard, Mahdi
• Is Part Of: Materials science in semiconductor processing. Volume 32(2015:Apr.)
• Page Start: 16
• Page End: 21
• Publication Date: 2015-04
• Subjects: Cadmium zinc sulfide nanoparticles -- Thermo-optical coefficient -- Nonlinear refractive -- Fizeau interferometer; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2014.12.072
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: Thermo-optical properties of cadmium zinc sulfide (CdZnS) nanoparticle colloids are investigated by interferometry technique. The nanoparticle colloids are synthesized by an improved co-precipitation method. Transmission electron microscopy, UV–vis spectrometry and X-ray diffraction analysis are used to characterize the CdZnS nanocrystals. The thermo-optic coefficient of the colloids has been determined using a Fizeau interferometer. For this purpose, the interference patterns are deformed by a photothermal phase shift which is locally induced in the sample by the focused pump laser beam. The change in the refractive index at this region imposes a shift on the phase of the fringe patterns. Fourier analysis performed on the interference patterns allows us to estimate the values of the thermo-optic coefficient and nonlinear refractive index of the sample. It is shown that the CdZnS nanoparticle colloids enhance the absorption of the laser light and induce high rise in the temperature of the sample, which leads to the nonlinear phase shift.