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126results about How to "Low responsiveness" patented technology

THz-wave detector

The invention discloses a THz-wave detector, which uses a high-electron-mobility field effect transistor (FET) with higher two-dimensional electron concentration as a basic structure unit, wherein the FET is provided with a source electrode, a gate electrode and a drain electrode. The THz-wave detector is characterized in that the device structure of the THz-wave detector comprises three lead electrodes, three low pass filters and a group of THz-wave coupled antennas, wherein the three electrodes of the FET and the THz-wave coupled antennas are connected to jointly serve as antennas; and the three electrodes of the FET are respectively connected with the corresponding lead electrodes through the low pass filters. The THz-wave detector has the advantages that the antennas are separated from the lead electrodes through the low pass filters, so the resonance performance of the antennas can be guaranteed, and the decrease of the device responsivity, which is caused by the leakage of high frequency THz-wave signals produced by the antennas to the lead electrodes through straight conducting wires, is prevented; and an ohmic contact is simultaneously provided with the source electrode, the drain electrode and the antennas, so the device structure is compact, the integration is facilitated, and a foundation is laid for the realization of the arraying and large-scale application of the THz-wave detector.
Owner:SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI

In-situ detection system for concentration of methane in deep sea

The invention provides an in-situ detection system for the concentration of methane in deep sea. The in-situ detection system is characterized in that by utilizing the characteristic that methane gas absorbs infrared light, methane components in a seawater water sample are separated by a gas-liquid separation technology, and then the content of the methane components is detected by using an infrared sensor. The detection system is composed of a flange disc, a decompression valve, a decompression cabin, a water inlet pump, a high-pressure-resisting water outlet pump, a gas pump, a solenoid valve, a circuit board, a gas-liquid separation optical detection chamber, a fixed bottom plate, a fixed bracket and a shell; and the appearance of the in-situ detection system is a small-size sealing device with a water inlet/outlet and an electric watertight connector. The in-situ detection system has a small response degree of non-methane gas and a high system signal-to-noise ratio; under a condition that ocean current of the deep sea fluctuates violently, the in-situ detection system has a strong anti-interference capability, a simple structure, a small size and low cost, and the integration of a small-size ocean monitoring system with relatively strong environment adaptability is convenient to realize; and the in-situ detection system can be distributed in a bad environment of the deep sea, and a concentration index of the methane in seawater can be subjected to in-situ detection under a long-time unmanned duty condition.
Owner:OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI

Preparation method of HCl gas sensor based on two-dimensional Au@MOFs nanoparticle ordered array

The invention discloses a preparation method of an HCl gas sensor based on a two-dimensional Au@MOFs nanoparticle ordered array. The preparation method comprises the steps: firstly, a quartz-based single-layer polymer colloid crystal array is prepared as a template; then a layer of gold film with the thickness being 20-40 nm is deposited on the surface of the template; then the template is subjected to thermolysis and annealing treatment, and a quartz-based two-dimensional gold nanoarray is prepared; then the quartz-based two-dimensional gold nanoarray is obliquely placed in Fe<III>-MOF-5 reaction liquid to react for 6 hours at 110 DEG C; and after natural cooling to the room temperature, a sample is taken out, rinsed with ethanol, and naturally air-dried, and the two-dimensional Au@Fe<III>-MOF-5 nanoparticle array can be obtained and can directly serve as the gas sensor for detecting the HCl concentration. Through the specific response of Fe<III>-MOF-5 to HCl and the optical characteristics of LSPR and optical diffraction of two-dimensional Au, the concentration of the HCl can be quickly detected in real time, and the visual sensor is simple in preparation process, low in cost, easy to operate and suitable for actual industrial application.
Owner:JIANGXI SCI & TECH NORMAL UNIV
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