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Electrodeposition of ZnTe nanowires into porous anodic alumina membranes
|Humberto Gómez 1, Daniel Lincot 2, Enrique Dalchiele 4, Gonzalo Riveros 3, Andrea Cortes 1|
1. Pontificia Universidad Católica de Valparaíso (PUCV), Avda Brasil 2950, Valparaíso Chile, Valparaíso xxxx, Chile
Template synthesis, a simple and versatile method for preparing nanostructured materials, entails synthesizing the desired material within the pores of a template membrane. Among various templates, the anodic alumina membrane (AAM) is a promising template for its uniform, nearly parallel, and ordered pore structure. Moreover, electrodeposition of nanowires inside nanoporous alumina templates has emerged as an easy, fast, and economic approach to form this type of nanostructured materials.
Zinc telluride is an important semiconductor material with a direct optical band gap of 2.2-2.3 eV at room temperature, which has potential applications in optoelectronic and thermoelectric devices. A detailed electrochemical study aimed to obtain thin films of this compound from a plating solution containing cadmium sulfate, tellurium dioxide and citric acid was conducted prior to the fabrication of ZnTe nanowires by electrodeposition into AAM pores. From this study it was possible to establish the optimal experimental conditions for the preparation of as grown ZnTe films with an almost stoichiometric atomic composition (50.40% Zn, 49.60 % Te). The ZnTe nanowires on the AAM membranes with 50 nm of pore diameter were then prepared through potentiostatic electrodeposition under similar conditions. The electrodeposited ZnTe nanowires were characterized by SEM and XRD analysis. The latter showed that they presented a preferential crystalline growth along the 200 direction, different to that reported in the scarce literature available on this subject.
Acknowledegements. This work was supported by FONDECYT-Chile (Grant N° 1040650). Special acknowledegements to the ECOS-CONICYT program ( projet N°C05E07) between France and Chile governments.
Presentation: Oral at E-MRS Fall Meeting 2007, Symposium B, by Humberto Gómez
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-17 23:05 Revised: 2009-06-07 00:44