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Nano Letters 9 (2009) 2133. Gold nanowires can be programmed to fail by electromigration yielding a nanometer-scale gap. This break is so small that it can be reconnected by applying a second voltage pulse or voltage scan. Many (>50) gap-formation and reconnection cycles can be carried out on a single nanowire. |
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Nano Letters 9 (2009) 2177. Our first examination of the hydrogen sensing properties of a single palladium nanowire. It's fast, it's sensitive, but its most surprising feature is that it doesn't break! |
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ACS Nano 2 (2008) 1939. LPNE combines the best properties of top-down nanofabrication using photolithography with bottom-up electrodeposition to create nanowires in a new way. |
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Nano Letters 8 (2008) 3017. We grow a gold nanowire, evaporate electrical contacts onto it, and cover it with photoresist. Then we open a "window" through which electrolyte solution can contact a section of the nanowire (see image at right). Using this arrangement, we ask a very simple question: Can a surface layer of oxide - just one molecular layer (about 1 nm) in thickness - affect the resistance of a gold nanowire? The answer will surprise you. |
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Nano Letters 8 (2008) 2447. Arrays of thousands of lead telluride (PbTe) nanowires that exceed 100 microns in length and which include segments that are suspended across 25 micron air gaps have been prepared using Lithographically Patterned Nanowire Electrodeposition (LPNE). These nanowires are ideal for fundamental investigations of the thermoelectric properties of these nanowires. |
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Nano Letters 8 (2008) 2373. In a collaboration with the research group of Prof. Eric Potma, we have fabricated "zig-zag" gold nanowires that alternate in height between 20 nm and 80 nm using a variant of the LPNE nanowire fabrication method. Such nanowires induce a spatially modulated and controllable anti-Stokes Raman emission signal. |
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Analytical Chemistry 80 (2008) 5695. The selective binding of a molecule to a covalent virus surface (CVS) can be detected using electrochemical impedance measurements. Sensing occurs at high frequencies above 4 kHz in the resistive impedence channel. This discovery, made in a collaboration with the research group of Prof. Greg Weiss, makes possible the miniaturization of sensors based upon the CVS, including sensors capable of sensing multie analyte molecules in parallel. |
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| Copyright 2008, R.M. Penner |