Self-supporting nanowire arrays templated in sacrificial branched porous anodic alumina for thermoelectric devices

Kalapi G. Biswas, Purdue University - Main Campus
Hatem El Matbouly, Purdue University - Main Campus
Vijay Rawat, Purdue University - Main Campus
Jeremy L. Schroeder, Birck Nanotechnology Center, Purdue University
Timothy D. Sands, Purdue University

Date of this Version



DOI: 10.1063/1.3207756

This document has been peer-reviewed.



Templated synthesis of thermoelectric nanowires in porous anodic alumina (PAA) have potential for enhanced performance relative to bulk materials. A significant challenge is the template material, which can serve as a thermal shunt. In this work, an approach for creating a branched PAA template is described. The process utilizes localized self-heating to destabilize the planar anodization front, yielding branched and interconnected pores growing at a rate of 300 mu m/h. The template is selectively etched after electrodeposition of desired materials, yielding self-supporting nanowire arrays with thicknesses up to about 300 mu m, thereby eliminating the thermal shunt through the template.


Engineering | Nanoscience and Nanotechnology