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


Image of FIG. 1.
FIG. 1.

Cross-sectional FESEM images of (a) an interconnected branched porous template showing the total thickness of the template of about , (b) a magnified view of a representative region in the B-PAA template displaying the branched network, pore diameter , and pore wall thickness . (c) 3D quasiperiodic network of pores throughout the template and (d) B-PAA/Al interface showing the barrier layer at the bottom of each pore with interpore distance and a larger-scale scalloping of the interface with a period of about .

Image of FIG. 2.
FIG. 2.

Plot of voltage-current-temperature transient during B-PAA formation. Aluminum is anodized in a phosphoric acid electrolyte at a potential of 160 V and a limiting current density of with an initial bath temperature of . An initial incubation period is observed during which the current is more typical of MA conditions. This is followed by an increase in bath temperature. The increase in bath temperature increases the ionic conductivity of the barrier oxide. This in turn leads to an increase in current and associated heating. The positive feedback runs the temperature up rapidly until boiling of the electrolyte within the pores interrupts anodization and limits the further rise in bath temperature to .

Image of FIG. 3.
FIG. 3.

Cross-sectional FESEM image of fractured self-supporting nanowire array after selective etching of the B-PAA in KOH solution, displaying the conformity of the nanowires to the shape of the branched porous network and mechanical integrity of the fractured surface.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Self-supporting nanowire arrays templated in sacrificial branched porous anodic alumina for thermoelectric devices