Method for detecting hydrogen by palladium nanoparticle discrete film

Abstract

The invention discloses a method for detecting hydrogen by a palladium nanoparticle discrete film. The method comprises the following steps that: palladium hexafluoroacetone (II), formalin, a quartz glass substrate, high-purity nitrogen and a carbon-supporting film are firstly prepared; under a vacuum environment, palladium hexafluoroacetone (II) is introduced into a reaction chamber as a precursor, and chemical absorption and chemical reaction are generated by the precursor of palladium hexafluoroacetone (II) and the surface of the quartz glass substrate; the formalin as a precursor generateschemical reaction with palladium hexafluoroacetone (II) as the precursor combined with the substrate. The method disclosed by the invention has the beneficial effects that the response rate of a sensing film to the hydrogen can be effectively increased, the phase change phenomenon caused by pure palladium in the high-concentration hydrogen can be effectively avoided, the accuracy of detection canbe ensured, and the problems that a palladium-yttrium alloy film in the existing optical-fiber hydrogen sensor is easily poisoned by oxygen in the air to cause foaming and cracking and the like of the film to further cause zero drift and influence the accuracy of hydrogen detection are solved.

Description

technical field

[0001] The invention relates to the technical field of hydrogen detection, in particular to a method for detecting hydrogen by a palladium nanoparticle discrete film. Background technique

[0002] Hydrogen is known as the three major new energy sources together with solar energy and nuclear energy due to its high combustion efficiency and non-polluting products. As a new energy, hydrogen has been widely used in aviation, power and other fields; at the same time, as a reducing gas and carrier gas, hydrogen is extremely important in chemical industry, electronics, medical treatment, metal smelting, especially in the field of military and national defense. Value. However, the hydrogen molecule is very small, and it is easy to leak during production, storage, transportation and use. Because hydrogen is not conducive to breathing, it is colorless and odorless, and cannot be detected by the human nose. The ignition point is only 585 °C, and the content in the air ...

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