8results about How to "Highly selective detection" patented technology

The invention discloses an NO2 gas sensing material, an NO2 gas sensor and a preparation method and application of the NO2 gas sensing material and the NO2 gas sensor. The NO2 gas sensing material is a semiconductor substrate material doped with variable-valence metal elements; the material of the semiconductor substrate is BiOX, and the element X is at least one of Cl, Br and I; the variable-valence metal element is a variable-valence transition metal element. The invention provides a design and preparation method of a gas sensor capable of rapidly detecting NO2 at room temperature. The method can realize reversible detection of NO2 at room temperature.

The invention discloses an electrochemical biosensor as well as a preparation method and application thereof, belongs to the technical field of detection, and aims to improve the detection sensitivity, specificity and detection accuracy of key biochemical substances of neurodegenerative diseases. The sensor comprises a substrate layer, a liquid inlet, a liquid outlet, a reference electrode and a counter electrode, the substrate layer comprises a PDMS flexible lower cover layer, a P3HT-Cu NWs conductive sensitive layer and a PDMS flexible upper cover layer, a micro-channel layer is arranged on the PDMS flexible upper cover layer, a channel is arranged in the micro-channel layer, and the P3HT-Cu NWs conductive sensitive layer is connected with a flexible flat cable. The preparation method comprises the following steps: preparing Cu NWs, preparing a P3HT-Cu NWs mixed solution, preparing a PDMS flexible lower cover layer, coating the PDMS flexible lower cover layer with the P3HT-Cu NWs mixed solution to obtain a P3HT-Cu NWs conductive sensitive layer, preparing a PDMS flexible upper cover layer, and bonding and sealing the PDMS flexible lower cover layer and the PDMS flexible upper cover layer to obtain the substrate layer.

The invention discloses a near-infrared double-state light-emitting platinum complex fluorescent probe and application thereof in hypochlorite detection. The structural formula of the near-infrared double-state light-emitting platinum complex fluorescent probe is shown in the specification. R1 and R2 are one of H, CH3, C2H5 and C (CH3) 3; the four technical elements of near-infrared emission, double-state luminescence, a platinum complex phosphorescent probe and hypochlorite specific recognition are integrated into the same molecular system for the first time, and a novel platinum complex fluorescent probe which keeps efficient near-infrared luminescence in a solution state and an aggregation state and realizes high-sensitivity and high-selectivity detection on hypochlorite is provided. The double dilemma of solid state quenching of a traditional ACQ material and weak luminescence of a solution of a classical AIE material are broken through, and the blank in the technical field is filled. The novel platinum complex fluorescent probe shows high selectivity, high stability, wide pH application range, low cytotoxicity and good biocompatibility on hypochlorite.

This invention provides a flexible multi-gate single-channel OECT molecularly imprinted sensor and its fabrication method, belonging to the field of flexible chemical sensor technology. This sensor employs a unique multi-gate single-channel integrated structure with gates symmetrically arranged at equal intervals around the source and drain electrodes and synergistically controlled within the same channel. Combined with MIP and OECT technologies, it possesses both high-sensitivity amplification capability and highly specific recognition of three non-electroactive BCAAs (leucine, isoleucine, and valine), enabling the detection of multiple substances with a single device.

The application relates to an Au / SnO2 / GND composite gas-sensitive material-based MEMS nitrogen dioxide sensor and a preparation method thereof, and belongs to the technical field of gas sensors. The sensor is composed of a metal tube seat and a MEMS micro-hot plate chip which are coaxially arranged and fixedly packaged, and the Au / SnO2 / GND composite gas-sensitive material is coated on the surface of the chip interdigital electrode. 3 The sp 2 Volume evolution during phase inversion is synchronous with the SnO2 crystallization process, the SnO2 shell and the carbon skeleton are tightly bonded at the atomic scale, lattice strain is induced at the heterojunction interface, and a high concentration of oxygen vacancies is generated; meanwhile, the ultraviolet photochemical reduction method is used to realize the fine and uniform dispersion of gold nanoparticles at a very low noble metal loading (0.5wt%-1.5wt%), and the high concentration of oxygen vacancies generated by the lattice strain constructs a double enhancement mechanism, which significantly improves the catalytic activity of the material and the sensitivity of the sensor.

The invention discloses a tungsten-based oxide composite material and a preparation method thereof, a trihydroxy dibutanone gas sensor and application, the tungsten-based oxide composite material is tungstate-tungsten oxide, and tungstate and tungsten oxide form a heterostructure; the tungsten oxide is W18O49; the tungstate is MWO4, and M is selected from at least one of Fe, Co, Ni, Cu and Sn. The successful design of the material and the preparation of the sensor provide a new thought for the detection of 3H-2B, and the epitaxial growth method can also be popularized to the fields of catalysis, energy and the like, and has extremely high reference value.

The application discloses a high-selectivity acetone gas sensor and a preparation method thereof, and comprises the following steps: providing a MEMS micro-hotplate substrate with a defined active window as a working substrate, in-situ growing an epsilon-WO3 nanostructure array in the active window, sequentially constructing a super-thin NiO continuous shell layer and a discrete CuO catalytic island on the surface of the epsilon-WO3 nanostructure array to form a radial p-n-p heterojunction sensitive structure with epsilon-WO3 as the core and NiO / CuO as the shell, performing a thermal stabilization treatment on the heterojunction sensitive structure, constructing a ZIF-8 molecular sieve film or a ring-shaped fluorinated ionomer selective layer on the surface of the heterojunction sensitive structure to obtain a high-selectivity sensor device, effectively blocking the passage of interfering molecules, and significantly improving the selectivity ratio and the anti-cross interference capability of the sensor device; meanwhile, based on the MEMS micro-hotplate substrate and the thermal stabilization treatment process, the device has good structural stability, low power consumption characteristics and compatibility with a standard semiconductor process, and high selectivity for acetone is realized while high sensitivity is ensured.

The invention discloses a hydrazine hydrate detection fluorescent probe NPB with 1, 8-naphthalimide as a parent and a preparation method and application thereof. The fluorescent probe takes 1, 8-naphthalimide as a fluorophore, and the structure of the fluorescent probe is shown in the specification. The fluorescent probe NPB based on 1, 8-naphthalimide as a matrix is constructed through a condensation reaction, and the probe shows excellent selectivity and high-sensitivity detection performance on hydrazine hydrate in a solution. In addition, the probe NPB is stable in structure, can be made into a test paper form, and is suitable for rapid detection of trace hydrazine hydrate in water samples, food and air; meanwhile, due to low cytotoxicity, the probe can be successfully applied to hydrazine hydrate detection in a PK-15 active cell system. The preparation method of the fluorescent probe is simple and convenient, raw materials are easy to obtain, and the product is solid powder, is convenient to store and has good application and development prospects.