Aspects describe a nanotube array gas sensor, and methods to manufacture and use the same. In one example, the nanotube array gas sensor comprises an insulator template including an array of parallel aligned, open-ended nanotubes; a sensing material deposited on at least interior surfaces of the nanotubes; and catalyst nanoparticles distributed on the sensing material. An electronic controller activates electrodes made of different conductor materials in order to obtain multiple measurements of electrical resistance across the insulator template. The electrical resistance measurements can be compared to electrical resistance profiles in order to determine types and concentrations of gases in the nanotube array gas sensor.

A hydrogen gas sensor with a substrate and a zinc oxide nanostructured thin film deposited on the substrate, wherein the zinc oxide nanostructured thin film has a lattice structure with a weight ratio of low binding energy O.sup.2− ions to medium binding energy oxygen vacancies in a range of 0.1 to 1.0, and a method of fabricating a gas sensor by thermally oxidizing a metal thin film under low oxygen partial pressure. Various combinations of embodiments of the hydrogen gas sensor and the method of fabricating the gas sensor are provided.

A small-sized, portable enclosure protects a gas sensor against degradation due to environmental exposure and changes in atmospheric conditions. The protective enclosure includes an inlet for introduction of a gas into the enclosure, an outlet for release of the gas upon completion of a sensing run, and a number of in-line filters that remove from the inflowing gas sample analytes, contaminants, and other materials that can compromise the integrity of the sensor or cause the sensor to degrade over time. The enclosure does not include any filters during the measurement phase of the sensing run in order to allow the gas sensor to accurately measure an unmodified gas mixture and/or analyte.

A nanoparticle characterized by sensitivity to an analyte of interest, and comprising a conductive core in contact with a plurality of ligands bound to the conductive core is disclosed. Additionally, a chemiresistor sensor comprising the nanoparticles of the invention and a method of using thereof such as for detection of an analyte of interest in a gaseous sample are disclosed.

The present invention relates to a suspended nanowire structure. The present invention, more particularly, relates to a suspended nanowire structure capable of high-speed operation by improving the reaction rate by making the temperature distribution of the nanowire uniform.

A suspended nanowire structure in accordance with an embodiment of the present invention comprises: a substrate; a plurality of nanowires float on the substrate and extending along a first direction; electrodes respectively connected to both ends of the plurality of nanowires; and a heating electrode which is disposed on both ends of the plurality of nanowires, extends in a second direction perpendicular to the first direction, and provides heat to both ends of the plurality of nanowires during driving.

A dispersion liquid of the present invention includes: a carbon nanohorn aggregate obtained by aggregating a plurality of single-walled carbon nanohorns in a fibrous form; and a solvent.

A thin film gas sensor device includes a substrate, a first electrode supported by the substrate, a second electrode supported by the substrate, and a gas-sensitive structure. The gas-sensitive structure is supported by the substrate and is electrically connected to the first and second electrodes. The gas sensitive structure includes a plurality of thin film layers of a first material vertically interleaved with a plurality of thin film layers of a second material. The first and second materials are mutually catalytic materials.

A thin film gas sensor device includes a substrate, a nanostructured thin film layer, and a first and a second electrode. The nanostructured thin film layer is supported by the substrate and is formed with a semi-conductor material including holes. The semiconductor material is configured to undergo an increase in a density of the holes in the presence of a target gas, thereby decreasing an electrical resistance of the nanostructured thin film layer. The first and the second electrodes are supported by the substrate and are operably connected to the nanostructured thin film layer, such that the decrease in electrical resistance can be detected.

A wireless sensor platform design and a single walled carbon nanotube/ionic liquid-based chemidosimeter system can incorporated into a highly sensitive and selective chemical hazard badge that can dosimetrically detect an analyte down to a sub parts-per-million concentration.

A catalytic nanoparticle can include a nanodiamond core, a thin-layer polymeric film applied to an outer surface of the nanodiamond core, and a catalyst immobilized at an outer surface of the thin-layer polymeric film. The nanoparticles can also be used in connection with a transducer to form a sensor. A method of catalysis can include contacting the catalytic nanoparticle with a reactant in a reaction area. The reactant can be capable of forming a reaction product via a reaction catalyzed by the catalyst. The method of catalysis can also include facilitating a catalytic interaction between the catalytic nanoparticle and the reactant.