Hydrogen sensitive element and preparation method thereof

Abstract

The invention relates to a hydrogen sensitive element and a preparation method thereof. The hydrogen sensitive element comprises a glass substrate, palladium-gold alloy nanoparticles, a polytetrafluoroethylene film and a polymethyl methacrylate film. The preparation method comprises the following steps: coating the polytetrafluoroethylene on the glass substrate; sequentially dripping a polyelectrolyte diallyl solution and a polystyrene disc particle suspension on the surface of the polytetrafluoroethylene film, carrying out washing, preparing a chromium film on the surface of the polytetrafluoroethylene film, stripping polystyrene particles to generate holes, and carrying out etching; depositing gold and palladium in the holes; removing the polytetrafluoroethylene film and the chromium film; carrying out annealing treatment on the glass substrate to form a palladium-gold alloy; and sequentially coating polytetrafluoroethylene and polymethyl methacrylate on the glass substrate. Compared with a palladium membrane, the palladium-gold alloy particles adopted by the invention have the advantages that the use amount of palladium is reduced, so that the cost is reduced; the polytetrafluoroethylene film can optimize the specific surface area of the nanoparticles, reduce the surface activation energy, inhibit the hysteresis phenomenon and improve the detection limit.

Description

technical field [0001] The invention relates to a hydrogen sensitive element and a preparation method, belonging to the technical field of hydrogen sensors. Background technique [0002] In today's era, fossil fuel energy is in short supply and its products will have a bad impact on the environment. Hydrogen, as a clean and sustainable energy, has gradually occupied an increasing proportion of many energy sources. However, the flammable concentration of hydrogen The range is 4%-96%, and it is an extremely flammable gas. There are great safety hazards in hydrogen energy storage systems, vehicles, electrical appliances, and the entire infrastructure involving hydrogen. Once there is a leakage problem, it must be detected as soon as possible. [0003] The hydrogen sensitive element of the existing hydrogen sensor is coated with a layer of palladium film on the fiber core. Palladium has good sensitivity and selectivity to hydrogen, and can realize the reversible phase transitio...

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Problems solved by technology

There are great safety hazards in hydrogen energy storage systems, vehicles, electrical appliances, and the entire infrastructure involving hydrogen. Once there is a leakage problem, it must be detected early

[0003] The hydrogen sensitive element of the existing hydrogen sensor is coated with a layer of palladium film on the fiber core. Palladium has good sensitivity and selectivity to hydrogen, and can realize the reversible phase transition from metal to metal hydride. By observing the hydrogen sensitive element changes to monitor hydrogen, but trace amounts of CO, NO 2 Such gases will destroy the dissociation of hydrogen, resulting in inaccurate detection of hydrogen by existing hydrogen sensors. At the same time, there are problems such as slow response of hydrogen at room temperature and easy hydrogen embrittlement. Furthermore, palladium, as a precious metal, is coated on the fiber core. Palladium film, more palladium is used, resulting in higher cost

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