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Tuning the Geometrical and Crystallographic Characteristics of Bi2Te3 Nanowires by Electrodeposition in Ion-Track Membranes

Picht, Oliver and Müller, Sven and Alber, Ina and Rauber, Markus and Lensch-Falk, Jessica and Medlin, Douglas L. and Neumann, Reinhard and Toimil-Molares, Maria Eugenia (2012):
Tuning the Geometrical and Crystallographic Characteristics of Bi2Te3 Nanowires by Electrodeposition in Ion-Track Membranes.
In: J. Phys. Chem. C, ACS Publications, pp. 5367-5375, 116, (9), [Online-Edition: http://dx.doi.org/10.1021/jp210491g],
[Article]

Abstract

We report the fabrication of Bi2Te3 nanowires with diameters as small as 15 nm, which is comparable to the size theoretically estimated for the onset of improvement of the thermoelectric figure of merit ZT by quantum-size effects. The versatility of the template-assisted growth, combining self-prepared ion-track etched membranes and electrochemical deposition, has been employed to synthesize Bi2Te3 nanowires with controlled diameters in 10, 30, and 60 µm thick membranes and with large aspect ratios (length over diameter) of up to 1000. SEM, HRTEM, and XRD investigations reveal how morphology, surface roughness, and crystalline orientation of the Bi2Te3 nanowires depend on deposition potential, temperature, and channel diameter.

Item Type: Article
Erschienen: 2012
Creators: Picht, Oliver and Müller, Sven and Alber, Ina and Rauber, Markus and Lensch-Falk, Jessica and Medlin, Douglas L. and Neumann, Reinhard and Toimil-Molares, Maria Eugenia
Title: Tuning the Geometrical and Crystallographic Characteristics of Bi2Te3 Nanowires by Electrodeposition in Ion-Track Membranes
Language: English
Abstract:

We report the fabrication of Bi2Te3 nanowires with diameters as small as 15 nm, which is comparable to the size theoretically estimated for the onset of improvement of the thermoelectric figure of merit ZT by quantum-size effects. The versatility of the template-assisted growth, combining self-prepared ion-track etched membranes and electrochemical deposition, has been employed to synthesize Bi2Te3 nanowires with controlled diameters in 10, 30, and 60 µm thick membranes and with large aspect ratios (length over diameter) of up to 1000. SEM, HRTEM, and XRD investigations reveal how morphology, surface roughness, and crystalline orientation of the Bi2Te3 nanowires depend on deposition potential, temperature, and channel diameter.

Journal or Publication Title: J. Phys. Chem. C
Volume: 116
Number: 9
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Mar 2012 16:18
Official URL: http://dx.doi.org/10.1021/jp210491g
Funders: We thank the Deutsche Forschungsgemeinschaft (DFG) within the SPP 1386 for financial support., Sandia National Laboratories is a multiprogram laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under Contract DE-, AC04-94AL85000. Support for D.L.M. and J.L.-F. was provided, in part, by the Sandia LDRD Office.
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