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(Top) Optical images of a single PPy nanowire on gold electrodes before (left) and after (right) maskless electrodeposition of nickel: scale bar represents . (Bottom, left) Corresponding schematic of loosely bound nanowire crossing two gold microelectrodes. (Right) Selective maskless electrodeposition of metal (green) on electrodes to embed the nanowire for better electrical and mechanical contact.
SEM micrographs of DS-PPy nanowires on electrodes after maskless nickel electrodeposition at (a) , (b) , (c) , and (d) at a constant charge density of (scale bars represents ). The ratio (e) as a function of applied deposition potentials and (f) initial resistance for contacts deposited at .
Sensor response of a loosely bound (a) and an embedded (b) single DS-PPy nanowire as a function of different concentrations in air. (c) The sensitivity of a loosely bound (◼) and embedded nanowire (●).
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