Investigación

 

One pot synthesis of PbS/Cu₂S core-shell nanoparticles and their optical properties

 

T. Serrano and I. Gómez*

 

Universidad Autónoma de Nuevo León, Facultad de Ciencias Químicas, Laboratorio de Materiales I, San Nicolás de los Garza, Nuevo León, México, * Phone (+52) 81-83294000 ext. 6362, Fax (+52) 81-83765375, e-mail: maria.gomezd@uanl.edu.mx

 

Received 17 May 2013.
Accepted 3 September 2013.

 

Abstract

The synthesis of PbS/Cu₂S core-shell nanoparticles with emission on the visible range and with improved luminescence properties was carried out by the colloidal solution-phase growth method by using simple stabilizers such as trisodium citrate and 3-mercaptopropionic acid. The core shell arrangement for particles with different crystalline structure was achieved, in addition this is the first report related to the synthesis PbS/Cu₂S core-shell system. The data obtained from absorption spectra, PL spectra, and HRTEM image provided direct proof of the formation of PbS core with size around 11 nm and Cu₂S shell of 5 nm thickness. According to the UV-vis absorption and PL spectrum, the optical characteristics observed in the synthesized material correspond to a PbS/Cu₂S system that has a higher confinement effect than the pure PbS nanoparticles. The QY was improved in 15 % from PbS to PbS/Cu₂S nanoparticles. The estimated band (HOMO-LUMO) alignment determined by CV measurements corresponds to a type-I core shell arrangement.

Keywords: Semiconductors; core-shell; PbS; Cu₂S; synthesis.

 

PACS: 81.07.-b;42.70.-a; 61.46.Hk

 

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Acknowledgments

I.G. acknowledges funding support from the Mexican Council for Science and Technology (CONACYT) grant CB 201001157745 and the Program for the Support of Scientific and Technological Research (PAICYT) of Universidad Autónoma de Nuevo Leon grant IT894-11.

 

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