Effect of Complex Agent Type on Structural and Optical Properties of CdSe Nano Particles

Abstract

CdSe capped with Trisodium citrate (TSC), Triethanolamine (TEA) and ethylenediaminetetraacetic acid (EDTA) nanoparticles were organized by chemical process at ambient conditions. Spin casting technique was used to deposit thin films on substrates from glass at room temperature. The properties of thin films like structural, morphological and optical were described by the transmissionelectron-microscopy, atomic-force-microscopy, X-ray diffraction, FTIR and optical measurements like Photoluminescence and absorption spectrum. The XRD analysis demonstrated that CdSe has a (sphalerite) cubic zinc Blended structure for all agents. FTIR spectrum indicated that nanoparticles capped well with complex agents. AFM results indicate that prepared films were very smooth with roughness about 1 nanometer. The optical band gaps (Eg) was found direct band gaps for all samples, where determined from the absorption, which is equivalent to 2.25 e. V, 2 e. V, and 1.9 e. V. The rise in the value of bandgaps of the thin films that deposited in this work as compared to bulk is due to the effect of quantum confinement. These nanoscaled thin films were found to exhibit high photoluminescence, Its intensity increase within increases of excitation wavelength.