Preparation of II–VI Semiconductors Nanoparticles and Investigation of Their Photophysical Properties

ABSTRACT

Results of X-ray diffraction (XRD), absorption spectra, and photoluminescence emission spectra are presented for CdS nanoparticles prepared by different techniques. These techniques included preparation of CdS nanoparticles in a liquid crystal state with H₂S as well as by mixing two lamellar phases, sol-gel technique, using thiophenol as capping agent, and prepared it in reverse micelles. XRD, which shows the crystalline nature of the materials as well as determines their size with Scherrer's equation has been studied. Absorption spectra, not only for CdS nanoparticles but for CdS dispersed in polymethylmethacrylate (PMMA), were studied and show a blue shift as a result of nanoparticles. Also, the photoluminescence emission spectra for as-prepared nanocomposite CdS that have different peaks depending on different parameters are discussed as will as nonlinear properties through two-photon absorption and second-harmonic generation for the prepared samples.

KEYWORDS:

• CdS nanoparticles
• sol-gel technique
• reverse micelle
• liquid crystal nanoreactors
• capping agent
• nanocomposite
• photoluminescence
• nonlinear properties

Acknowledgments

This research was supported by grant Russian Federation Fund for Research No. 08-03-00984.