Abstract: A gas sensor system (100) comprising at least one first field effect transistor (200) comprising first source and drain electrodes and at least one second field effect transistor (300) comprising second source and drain electrodes different from the first source and drain electrodes. Different responses of the first and second FETs to gases in an environment may be used to differentiate between the gases, for example to differentiate between 1-methylcyclopropene and ethylene in locations where fruit is stored.

Abstract: A sensor system that removes responses from an interferent and/or corrects for baseline drift of a sensor to determine a presence, a concentration or a change in concentration of a target material in a gaseous environment. Fluid flowing into the system may be directed by a valve arrangement to either a first fluid flow path or a second fluid flow path. The target material may be absorbed by a filter material in the first fluid flow path. Fluid flowing along the second gas flow path passes directly to the sensor. Responses of the sensor to fluids from the first and second fluid flow paths may be used to determine a presence, concentration or change in concentration of the target material.

Abstract: A gas sensor system (100) for detecting conjugated hydrocarbons and/or esters in an environment. The gas sensor system includes two organic thin film transistor (OTFT) gas sensors (200, 300). The first OTFT gas sensor (200) allows for interaction of the conjugated hydrocarbon with the gas sensor's source and drain electrodes, and the second OTFT gas sensor (300) blocks the conjugated hydrocarbon from interacting with the gas sensor's source and drain electrodes. In the second gas sensor, a monolayer comprising 4-aminobenzenethiol and 4-fluorobenzenethiol may cover the source and drain electrodes preventing the conjugated hydrocarbon from interacting with the source and drain electrodes. The gas sensor system may be used to monitor a volatile conjugated hydrocarbon and/or an ester produced by fruit.

Abstract: A gas sensor system for measuring a plurality of gases in an environment. The gas sensors system comprises multiple gas sensors where each of the gas sensors includes a pair of electrodes separated by a semiconducting material. The gas pairs of electrodes of the gas sensors are separated by different distances in each of the gas sensors. Resistivity of the semiconducting material of the gas sensors changes in the presence of a first gas and a contact resistivity between the electrodes and the semiconducting material of gas sensors changes in the presence of a second gas. From measurements of total resistivity of each of the gas sensors the presence and/or the concentration of both the first and the second gas sensors can be determined.

Abstract: A top gate thin film transistor gas sensor for detecting or measuring a concentration of a target gas. The gas sensor is configured so that the target gas can pass through the top gate and interact with a semiconducting layer of the gas sensor. The top gate may not cover a channel of the semiconducting layer disposed beneath the top gate so that the target gas may communicate with the channel without impedance by the top gate. The top gate may be patterned with channels through which the target gas may pass through the top gate to the channel in the semiconducting layer. The top gate may be permeable to the target gas allowing passage of the target gas to the channel. A substrate on which the semiconducting layer is formed may be permeable to the target gas allowing the target gas to communicate with the channel.

Abstract: A gas sensor system is made up of a first gas sensor that is sensitive to both a target gas (200) and a secondary gas and a second sensor (300) that is only sensitive to the target gas. The response of the two gas sensors is processed to detect a presence of or a concentration of the target gas. The first sensor includes a semiconductor material that is sensitive to the presence of both the target and the secondary gas and electrodes that are sensitive to the presence of the target gas. The second sensor includes a semiconductor material that is sensitive to the presence of both the target and the secondary gas, but also includes a blocking layer on a surface of at least one of the electrodes that prevents the second gas interacting with the electrodes.

Abstract: An ethylene gas sensor based on an organic field-effect transistor that includes an organic semiconductor layer incorporating a non-conducting polymer. The non-conducting polymer enhances the response of the organic field-effect transistor to presence of ethylene.

Abstract: A thin film transistor gas sensor and a method of sensing a target gas using the thin-film transistor gas sensor. A gate electrode of the thin film transistor gas sensor has a conductive layer with a surface in direct contact with a dielectric layer of the thin-film transistor. The work function at the surface changes when it comes into contact with a target gas, for example the gate electrode may be formed from gold and have a surface work function that changes when the surface of the gold gate electrode comes into contact with a gas, such as 1-methylcyclopropene.

Abstract: A gas sensor system (100) comprising at least one first field effect transistor (200) comprising first source and drain electrodes and at least one second field effect transistor (300) comprising second source and drain electrodes different from the first source and drain electrodes.

Abstract: A method of making an electrode for an organic electronic device comprises the steps of depositing an ink on a light emitting layer, and drying said ink to form said electrode. The ink comprises conductive metal or carbon particles, a binder and a hydrocarbon solvent selected from 1,1?-bicyclohexyl, cis-decalin trans-decaiin or n-undecane.

Abstract: A method for the fabrication of organic electronic devices includes forming a fluoropolymer layer over a first area of a substrate and a first set of organic electronic devices. The first set of organic electronic devices are pre-fabricated on a second area of the substrate. The method further includes selectively removing the formed fluoropolymer layer from areas within the first area of the substrate by using a liquid solvent. The method further includes subsequent fabrication of organic electronic devices on the substrate.

Abstract: An organic light emitting device having a layered structure comprising: a getter layer (6); an adhesive layer (5); a non-transparent cathode layer (4); a light-emitting layer (3); and a transparent anode layer (2); wherein the getter layer or adhesive layer include light absorbing materials to improve contrast in use.

Abstract: A method for the fabrication of organic electronic devices includes forming a fluoropolymer layer over a first area of a substrate and a first set of organic electronic devices. The first set of organic electronic devices are pre-fabricated on a second area of the substrate. The method further includes selectively removing the formed fluoropolymer layer from areas within the first area of the substrate by using a liquid solvent. The method further includes subsequent fabrication of organic electronic devices on the substrate.

Abstract: A method of making an electrode for an organic electronic device comprises the steps of depositing an ink on a light emitting layer, and drying said ink to form said electrode. The ink comprises conductive metal or carbon particles, a binder and a hydrocarbon solvent selected from 1, 1?-bicyclohexyl, cis-decalin trans-decaiin or n-undecane.

Abstract: A composition comprises a low molecular weight polyelectrolyte, a high molecular weight polymer, a light-emitting material and a salt. The viscosity average molecular weight of the high molecular weight polymer in at least one solvent is at least 5 times greater than the viscosity average molecular weight of the low molecular weight polyelectrolyte in the at least one solvent, and the high molecular weight polymer and the low molecular weight polymer are preferably different molecular weight polymers of the same polyelectrolyte material, such as polyethylene oxide. The composition is used to provide a light emitting layer (103) in a light-emitting electrochemical cell between an anode (101) for injecting positive charge carriers and a cathode (105) for injecting negative charge carriers.