Abstract: A device, method, and system having a gas sensor, such as those in used in electronic noses or e-noses, for gas detection in a sample. In particular, the device, method, and system is concerned with ethylene gas detection for monitoring of the ripening of fruit.

Abstract: A method of forming one-dimensional metal oxide nanostructures includes forming a TiN film on a substrate to provide a TiN-coated substrate; providing an aqueous mixture including hexamethylenetetramine and a metal nitrate, contacting the TiN-coated substrate with the aqueous mixture such that the TiN film on the substrate is in the aqueous mixture, and heating the aqueous mixture at a temperature ranging from about 50° C. to about 100° C. for a period of time ranging from about 60 minutes to about 180 minutes to form the metal oxide nanostructures. The method offers a low-temperature approach for the growth of metal oxide nanostructures. In an embodiment, the metal oxide is zinc oxide (ZnO) and the metal nitrate is zinc nitrate. In an embodiment the substrate is a Si/SiO2 substrate. In an embodiment, the metal oxide nanostructures include one-dimensional nanostructures, such as nanorods.

Abstract: A method of forming metal nanostructures is a low temperature closed space vacuum deposition method. The method includes disposing a source material in an enclosed space at low evaporation temperatures to controllably form nanostructures of different dimensionalities on a substrate. The nanostructures have dimensionalities determined by a chosen evaporation temperature. An apparatus is also provided for performing the method.

Abstract: The ethylene sensor is formed from a substrate with a gold thin film layer formed thereon. The substrate may be formed from soda-lime glass with a thickness of approximately 1.0 mm. Correspondingly, the gold layer may have a thickness of approximately 200 nm. The gold layer is divided into first and second regions or electrodes by a variable impedance channel containing K0.003Au0.008Mg0.009Ca0.015Si0.11Na0.175O0.68 as an ethylene selective material. The channel may be configured such that first and second sets of interdigitated gold fingers are defined in the first and second regions or electrodes, respectively. An ohmmeter is connected to the first and second regions to measure a resistance therebetween. A reference resistance is initially measured that is indicative of an absence of ethylene. Subsequent measurements of the resistance are compared against this reference resistance, with variations in the measured resistance indicating the presence of ethylene.

Abstract: A method of forming metal nanostructures is a low temperature closed space vacuum deposition method. The method includes disposing a source material in an enclosed space at low evaporation temperatures to controllably form nanostructures of different dimensionalities on a substrate. The nanostructures have dimensionalities determined by a chosen evaporation temperature. An apparatus is also provided for performing the method.

Abstract: A method of forming metal nanostructures is a low temperature closed space vacuum deposition method. The method includes disposing a source material in an enclosed space at low evaporation temperatures to controllably form nanostructures of different dimensionalities on a substrate. The nanostructures have dimensionalities determined by a chosen evaporation temperature. An apparatus is also provided for performing the method.