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Colloidal copper sulfide nanocrystals: Electrochemical, electrical and morphological properties

Published online by Cambridge University Press:  12 May 2015

Alejandro Baray-Calderón ,
R. Galindo ,
J. L Maldonado. ,
Omar Martínez-Alvarez ,
L.S. Acosta-Torres ,
José Santos-Cruz ,
J. de la Fuente-Hernández  and
M.C. Arenas-Arrocena
Alejandro Baray-Calderón
Affiliation:
Posgrado en Ciencia e Ingeniería de Materiales, Universidad Nacional Autónoma de México, UNAM, México
R. Galindo
Affiliation:
Centro de Investigaciones en Óptica A.C., León Guanajuato, México Cátedra CONACyT, Universidad de Guanajuato
J. L Maldonado.
Affiliation:
Centro de Investigaciones en Óptica A.C., León Guanajuato, México
Omar Martínez-Alvarez
Affiliation:
Universidad Politécnica de Guanajuato, Guanajuato, México
L.S. Acosta-Torres
Affiliation:
Escuela Nacional de Estudios Superiores, Unidad León, UNAM, León Guanajuato, México.
José Santos-Cruz
Affiliation:
Universidad Autónoma de Querétaro, Querétaro México
J. de la Fuente-Hernández
Affiliation:
Escuela Nacional de Estudios Superiores, Unidad León, UNAM, León Guanajuato, México.
M.C. Arenas-Arrocena*
Affiliation:
Escuela Nacional de Estudios Superiores, Unidad León, UNAM, León Guanajuato, México.
*
*Corresponding Author [email protected]
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Abstract

The highlight of this work is the synthesis of copper sulfide nanocrystals by a simple one-pot colloidal process, and the study of its electrochemical, electrical and morphological properties. Nanocrystals of Cu1.8S of about 15-30 nm were obtained at a temperature of 240°C under an argon atmosphere. The colloidal solution of the nanocrystals was analyzed by cyclic voltammetry. Agreeing to the values of EOx and ERedvs. SCE, and the average of three samples the HOMO and LUMO levels are 6.16 and 4.27 eV, respectively, the calculated HOMO – LUMO (Eg) is 1.89 eV. The Eg value, differs of that value obtained from Kubelka-Munk equation (1.7 eV). The photocurrent vs. time results showed that the Cu1.8S/Cu junction is photosensitive and could be used as absorbing material. The morphology and the topography of the film were analyzed by SEM and AFM techniques. Irregular agglomeration of nanocrystals was observed and a roughness of about 194 nm.

Keywords

nanostructureCucolloid
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1748: Symposium II – Semiconductor Nanocrystals, Plasmonic Metal Nanoparticles, and Metal-Hybrid Structures , 2015 , mrsf14-1748-ii11-55
Copyright
Copyright © Materials Research Society 2015 

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References

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