Zinc oxide porous film doped with copper oxide and preparation method thereof

Abstract

The invention discloses a zinc oxide porous film doped with a copper oxide and a preparation method thereof. More than one layer of zinc oxide porous film doped with the copper oxide is coated on a substrate; the atomic percent of the copper oxide to zinc oxide in the porous film is (0.1-95at%): (5-99.9at%); the film thickness is 20-4,000nm; and the diameter of a bowl hole is 50-5,000nm. The method comprises the following steps: mixing a copper nitrate solution with a zinc nitrate solution to obtain a metal oxide precursor liquid according to the concentration ratio of copper ions to zinc ions being (0.1-95):(5-99.9); firstly, immersing a single-layer colloid crystal template into the metal oxide precursor liquid; fishing up single-layer colloid crystal by using a substrate after the single-layer colloid crystal template is separated from a base, so as to obtain the substrate which is coated with the single-layer colloid crystal and dipped with the precursor liquid; annealing after drying, so as to obtain the substrate which is coated with the zinc oxide porous film doped with the copper oxide in a bowl hole shape at the surface; and repeating the film-forming process once or more, so as to prepare the target product. Thus, the zinc oxide porous film doped with the copper oxide can be widely applied to detection of a hydrogen sulfide gas.

Description

technical field [0001] The invention relates to a porous film and a preparation method thereof, in particular to a porous film doped with copper oxide and zinc oxide and a preparation method thereof. Background technique [0002] Hydrogen sulfide (H 2 S) Gas is ubiquitous in nature and industrial fields, such as natural gas processing, petroleum refining, petrochemical industry and coal gasification, and is a relatively common by-product in chemical industry production. Hydrogen sulfide gas is highly toxic and has a strong smell of rotten eggs. After inhaling a certain amount, people will feel shortness of breath, anxiety, headache, nervous disorders, and even death. Therefore, its rapid identification, online tracking detection and monitoring are very important. Recently, in order to monitor hydrogen sulfide gas, zinc oxide (ZnO) films with a resistive sensitive layer are often used. The preparation method of this film is mostly to make zinc oxide nano-slurry on the gas-s...

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Problems solved by technology

However, there are deficiencies in both the zinc oxide film and its preparation method. First, the specific surface area of ​​the film is relatively small, which restricts the improvement of the sensitivity of detecting hydrogen sulfide gas; second, the thickness of the film is not uniform, resulting in individual There is a large difference in the detection performance between them; finally, the preparation method cannot obtain a sensitive element with high detection sensitivity and consistent detection performance for hydrogen sulfide gas

[0003] In recent years, in order to improve the gas-sensing performance of ZnO to hydrogen sulfide, people tried to dope other metal materials in the ZnO matrix or on the surface, such as Au (gold), Pt (platinum), etc., which obtained enhanced gas-sensing performance, But it also makes the recovery time of most sensors too long, resulting in low work efficiency and poor practicability

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