Amy L. Prieto

Thermal properties of electrodeposited bismuth telluride nanowires embedded in amorphous alumina

Bismuth telluride nanowires are of interest for thermoelectric applications because of the predicted enhancement in the thermoelectric figure-of-merit in nanowire structures. In this letter, we carried out temperature-dependent thermal diffusivity characterization of a 40nm diameter Bi2Te3 nanowires∕alumina nanocomposite. Measured thermal diffusivity of the composite decreases from 9.2×10−7m2s−1 at 150Kto6.9×10−7m2s−1 at 300K and is lower than thermal diffusivity of unfilled alumina templates. Effective medium calculations indicate that the thermal conductivity along nanowires axis is at least an order of magnitude lower than thermal conductivity of the bulk bismuth telluride.

Magnetic switching of phase-slip dissipation in NbSe 2 nanoribbons

The stability of the superconducting dissipationless and resistive states in single-crystalline

Measurements of Bi/sub 2/Te/sub 3/ nanowire thermal conductivity and Seebeck coefficient

{mathrm{NbSe}}_{2}

High Spatial Resolution Assessment of the Structure, Composition, and Electronic Properties of Nanowire Arrays

nanoribbons is characterized by transport measurements in an external magnetic field

Electrodeposition of CoSb/sub 3/ nanowires

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Thermal Diffusivity Characterization of Bi2Te3 Nanowires Array Inside Amorphous Alumina Template

. Current-driven electrical measurements show voltage steps, indicating the nucleation of phase-slip structures. Well below the critical temperature, the position of the voltage steps exhibits a sharp, periodic dependence as a function of

Electrodeposition of Bi 2 Te 3 Nanowire Composites

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Fabrication of High‐Density, High Aspect Ratio, Large‐Area Bismuth Telluride Nanowire Arrays by Electrodeposition into Porous Anodic Alumina Templates

. This phenomenon is discussed in the context of two possible mechanisms: the interference of the order parameter and the periodic rearrangement of the vortex lattice within the nanoribbon.

Electrodeposition of Ordered Bi2Te3 Nanowire Arrays

Theoretical predictions suggest that the thermoelectric properties of nanowires could be greatly enhanced compared with the bulk materials. To investigate these predictions, bismuth telluride nanowires are synthesized by electrodeposition into the cavities of porous alumina templates. Individual nanowires are then isolated, and subjected to measurements of both thermal conductivity and Seebeck coefficient over temperatures ranging from 20 K to 320 K. All measurements are made using a microfabricated device consisting of two suspended membranes with integrated heaters and resistance thermometers. Platinum or carbon films are locally deposited at the wire and the heater pad junctions to enhance the contact conductance. Results show that the thermal conductivity of the measured Bi/sub 2/Te/sub 3/ nanowires varies from wire to wire and show different temperature dependence, probably because the wire composition and crystal structure are not the same.

Direct Electrodeposition of Highly Dense 50 nm Bi2Te3-ySey Nanowire Arrays

Abstract : We have employed transmission electron microscopy (TEM) and analytical electron microscopy to perform preliminary assessment of the structure, composition and electronic properties of nanowire arrays at high spatial resolution. The two systems studied were bismuth and bismuth telluride nanowire arrays in alumina (wire diameters 40nm), both of which are promising for thermoelectric applications. Imaging coupled with diffraction in the TEM was employed to determine the grain size in electrodeposited Bi2Te3 nanowires. In addition, a composition gradient was identified along the wires in a short region near the electrode by energy-dispersive x-ray spectroscopy. Electron energy loss spectroscopy combined with energy-filtered imaging in the TEM revealed the excitation energy and spatial variation of plasmons in bismuth nanowire arrays.