Investigación

 

Optical and structural properties of CdS:Pb²⁺ nanocrystals

 

R. Gutiérrez^a,*, O. Portilloª, M. Chávez^b, H. Juárez^b, M. Pacio^b, L. Chaltelª, M. Zamoraª, M. Lazcanoª, E. Rubio^c, and G. Hernandezª

 

ª Materials Science Laboratory, Facultad de Ciencias Químicas, Universidad Autónoma de Puebla, P.O. Box 1067, Puebla, Pue., 72001 México. * Tel. (01 222) 2-29-55-00 Ext. 7519. e-mail: osporti@yahoo.mx

^b CIDS-ICUAP, Universidad Autónoma de Puebla, Puebla, Pue., 72001 México.

^c Centro Universitario de Vinculación y Transferencia Tecnológica, Universidad Autónoma de Puebla, Ciudad Universitaria, Colonia San Manuel, Puebla, Pue., 72001 México.

 

Received 8 April 2015.
Accepted 29 May 2015.

 

Abstract

The goal of this work is to study the effects of doping on structural, morphological and optical properties of CdS thin films as a function of Pb²⁺ concentration. Thus, nanoparticles were synthesized by chemical bath and a thickness decrease of ~575-200 nm range was observed. In Fourier-transform infrared spectroscopy, all the samples showed a sharp stretching mode observed at ~1384 cm^-1 corresponding to the vibration mode of CO₃^-2. X-ray diffraction studies show that the size of crystallites is in the ~33-12 nm range. The peaks belonging to primary phase are identified at the 2θ = 26.5° and 2θ = 26.00°, corresponding to CdS and PbS respectively. Thus, a shift in maximum intensity peak from 2θ = 26.4° to 28.2° is observed. Likewise peaks at 2θ = 13.57°, 15.91° correspond to lead perchlorate thiourea. The optical, absorption, and transmission properties of the films were determined by UV-vis spectrophotometry, optical energy gap was found to range from 2.1 to 2.4 eV. Raman spectroscopy on doped films showed a shifting of these modes that can be attributed to strain, stress effects, defects, phonon confinement, and variation in phonon relaxation with grain size.

Keywords: Chemical bath; CdS; cell potential; nanoparticles; coordination complex; doping.

PACS: 71.20.Nr; 68.55.A; 64.70.kg

 

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