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

Biswas, Kalapi G.; El Matbouly, Hatem; Rawat, Vijay; Schroeder, Jeremy L.; Sands, Timothy D.
August 2009
Applied Physics Letters;8/17/2009, Vol. 95 Issue 7, p073108
Academic Journal
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 μm/h. The template is selectively etched after electrodeposition of desired materials, yielding self-supporting nanowire arrays with thicknesses up to about 300 μm, thereby eliminating the thermal shunt through the template.


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