SYNTHESIS AND CHARACTERIZATION OF CdS NANOPARTICLES BY TWO DIFFERENT FORMULATIONS USING POLYETHYLENIMINE AS COMPLEXING AGENT

In this paper we present two different formulations to obtain CdS nanoparticles using polyethylenimine (PEI) and another with ammonium hydroxideas a complexing agent. Chemical composition was obtained by X-ray photoelectron spectroscopy and Raman spectroscopy all of these confirmed the CdS presence. Optics properties such as absorption and transmission were measured. Transmission results were among 20 and 60 percent through 500 y 900 nm and the absorption borders about the order of 487 nm for both formulations. Gap energy was calculated from these absorption values obtaining 2.54 eV for the ammonium hydroxide formulation and 2.55 eV for PEI. On the other hand, a Transmission Electronic Microscope (TEM) determined structural properties, where clusters of different form and orientations (cubical and hexagonal structure) were observed with an average size of 8 nm for both formulations.