Journal ArticleDOI
Hydrogen Sensors and Switches from Electrodeposited Palladium Mesowire Arrays
TLDR
Hydrogen sensors and hydrogen-activated switches were fabricated from arrays of mesoscopic palladium wires fabricated by electrodeposition onto graphite surfaces and transferred onto a cyanoacrylate film.Abstract:
Hydrogen sensors and hydrogen-activated switches were fabricated from arrays of mesoscopic palladium wires. These palladium "mesowire" arrays were prepared by electrodeposition onto graphite surfaces and were transferred onto a cyanoacrylate film. Exposure to hydrogen gas caused a rapid (less than 75 milliseconds) reversible decrease in the resistance of the array that correlated with the hydrogen concentration over a range from 2 to 10%. The sensor response appears to involve the closing of nanoscopic gaps or "break junctions" in wires caused by the dilation of palladium grains undergoing hydrogen absorption. Wire arrays in which all wires possessed nanoscopic gaps reverted to open circuits in the absence of hydrogen gas.read more
Citations
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Synthesis of Tetrahexahedral Platinum Nanocrystals with High-Index Facets and High Electro-Oxidation Activity
TL;DR: Platinum NCs of unusual tetrahexahedral (THH) shape were prepared at high yield by an electrochemical treatment of Pt nanospheres supported on glassy carbon by a square-wave potential to exhibit much enhanced catalytic activity for equivalent Pt surface areas for electro-oxidation of small organic fuels such as formic acid and ethanol.
Journal ArticleDOI
New approaches to nanofabrication: molding, printing, and other techniques.
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Electrospinning of polymeric and ceramic nanofibers as uniaxially aligned arrays
Dan Li,Yuliang Wang,Younan Xia +2 more
TL;DR: In this article, a collector consisting of two pieces of electrically conductive substrates separated by a gap whose width could be varied from hundreds of micrometers to several centimeters.
Journal ArticleDOI
Semiconductor nanowires and nanotubes
TL;DR: In this article, a review highlights the recent advances in the field, using work from this laboratory for illustration, and the understanding of general nanocrystal growth mechanisms serves as the foundation for the rational synthetic control of one-dimensional nanoscale building blocks, novel properties characterization and device fabrication based on nanowire building blocks.
Journal ArticleDOI
Hydrogen Sensors - A review
TL;DR: There are an immense number of sensors reported in the literature for hydrogen detection and in this article these sensors are classified into eight different operating principles, such as measuring range, sensitivity, selectivity and response time.
References
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Journal ArticleDOI
Nanotube molecular wires as chemical sensors
Jing Kong,Nathan R. Franklin,Chongwu Zhou,Michael Chapline,Shu Peng,Kyeongjae Cho,Hongjie Dai +6 more
TL;DR: The nanotubes sensors exhibit a fast response and a substantially higher sensitivity than that of existing solid-state sensors at room temperature and the mechanisms of molecular sensing with nanotube molecular wires are investigated.
Journal ArticleDOI
Extreme oxygen sensitivity of electronic properties of carbon nanotubes
TL;DR: The results, although demonstrating that nanotubes could find use as sensitive chemical gas sensors, likewise indicate that many supposedly intrinsic properties measured on as-prepared nanotube may be severely compromised by extrinsic air exposure effects.
Journal ArticleDOI
Molybdenum Nanowires by Electrodeposition
TL;DR: The hemicylindrical wires prepared by this technique were self-uniform, and the wires prepared in a particular electrodeposition (in batches of 10(5) to 10(7)) were narrowly distributed in diameter.
Journal ArticleDOI
Full and Modulated Chemical Gating of Individual Carbon Nanotubes by Organic Amine Compounds
Jing Kong,Hongjie Dai +1 more
TL;DR: In this article, the adsorption of several types of alkylamine molecules on individual semiconducting and metallic single-walled carbon nanotubes was investigated by electrical transport measurements.
Journal ArticleDOI
Water-vapor effect on the electrical conductivity of a single-walled carbon nanotube mat
TL;DR: In this article, the influence of water vapor on the electrical resistance of a single-walled carbon nanotube mat (SWNTm) was investigated and it was shown that the sample exhibits a crossover from decreasing to increasing conductance versus water concentration in the surrounding atmosphere.