A detection device includes a plurality of detection units formed on a semiconductor circuit, a correction capacitive element that indicates a correction capacitance value for correcting detected capacitance values detected by the detection units, a difference acquisition circuit that acquires a difference value between each of the detected capacitance values and the correction capacitance value, and a conversion circuit that converts the difference value into a digital signal. The correction capacitive element, the difference acquisition circuit, and the conversion circuit are formed on the semiconductor circuit.

Gas sensors for the detection of rare events consume very little or no power. The sensors include materials that interact with a target gas. Accumulation of the target gas on the sensor materials leads to a change in electrical properties of the sensor. The sensors may have high gain, meaning that a large electrical change is induced upon gas accumulation. The sensor might change from an extremely high resistance (open circuit) to a measurably low resistance, or it might change from a relatively low capacitance to a high capacitance. The gas sensors are connected to electronics that can transmit an alarm signal after gas has been detected. The electronics may be in a low power sleep mode until awakened by a signal from the sensor.

According to one embodiment, a gas sensor includes a film structure including a gas sensitive film and a heater film heating the gas sensitive film, a physical quantity sensing section sensing a predetermined physical quantity which varies based on storage of a gas to be carried out by the gas sensitive film, a voltage generation section generating a first voltage for heating the gas sensitive film at a first temperature and a second voltage for heating the gas sensitive film at a second temperature higher than the first temperature, and a voltage switching section switching between the first voltage and the second voltage to be supplied to the heater film.

Disclosed are a chemi-capacitive sensor using a nanomaterial and a method of manufacturing the same. The chemi-capacitive sensor includes a lower electrode including a conductor, an insulation part formed on the lower electrode and including an insulator, an upper electrode disposed on the insulation part and including a first electrode and a second electrode spaced apart from the first electrode, and a detection part disposed on the first electrode, the second electrode, and the insulation part between the first electrode and the second electrode and including at least one selected from the group consisting of a carbon nanomaterial and a metal-oxide-coated carbon nanomaterial. The chemi-capacitive sensor of the present invention is effective at selectively analyzing gas analytes.

A sensor arrangement (10) comprises a capacitive sensor (11) with a first electrode line (12), a second electrode line (16) and a third electrode line (20) and a sensitive layer (30) arranged at the first, the second and the third electrode line (12, 16, 20). The sensor arrangement (10) comprises a readout circuit (50) that comprises a capacitance-to-digital converter (51), is coupled to the first, the second and the third electrode line (12, 16, 20) and is configured to generate a first measurement signal (S1) using the first and the second electrode line (12, 16) and a second measurement signal (S2) using at least the third electrode line (20).

A gas sensor combines two separate measurement methods in one shared structure. By way of the gas sensor, a qualitative or quantitative measurement of gases based on measurement of a variation in electrical conductivity, and a measurement of a change in work function based on a variation in the capacitance or impedance between two electrodes, can be carried out.

An oxygen permeable element includes an anode, a cathode, and a solid electrolyte. With a voltage applied between the anode and the cathode, oxygen gas in the cathode side atmosphere is allowed to pass through the solid electrolyte to the anode side. The oxygen permeable element has interlayers located between the solid electrolyte and at least one of the cathode and the anode, at least one interlayer containing an oxide of bismuth. The solid electrolyte contains an oxide of lanthanum.

Embodiments herein relate to chemical sensors, devices and systems including the same, and related methods. In an embodiment, a medical device is included having a graphene varactor including a graphene layer and a self-assembled monolayer disposed on an outer surface of the graphene layer through non-covalent interactions between the self-assembled monolayer and a -electron system of graphene. The self-assembled monolayer includes one or more pillarenes, substituted pillarenes, calixarenes, substituted calixarenes, peralkylated cyclodextrins, substituted peralkylated cyclodextrins, pyrenes, or substituted pyrenes, or derivatives thereof. Other embodiments are also included herein.

A gas sensing method and a gas sensing system are provided. The gas sensing method includes using a gas sensing device to sense a target gas, the gas sensing device having a self-heating region capable of producing a change in resistance in response to the target gas being sensed by the gas sensing device, and controlling a change in supply of current or voltage to the gas sensing device according to the change in resistance, so that the gas sensing device is substantially maintained operating at a predetermined temperature for sensing the target gas.

Provided is a gas detection device used in a humid environment such as a kitchen or a cooking room, which is excellent in moisture resistance and also excellent in sensitivity. In a gas detection device which includes a thin film type gas sensor including a heater portion, a gas detection portion, and a catalyst portion on a substrate, energizes the heater portion to heat the gas detection portion and the catalyst portion, and detects the detection target gas, the gas sensor configured by supporting a catalyst metal containing platinum as a main component on a support containing a transition metal oxide as a main component is adopted.