Preparation method of flower-like nickel oxide composed of porous sheets

Abstract

The invention discloses a preparation method of flower-like nickel oxide composed of porous sheets. The preparation method is characterized by comprising the steps: dissolving nickel acetate tetrahydrate in distilled water to form a nickel acetate solution; and dissolving PVA and urea in distilled water to form a mixed solution; slowly dropwise adding the mixed solution into a nickel acetate solution, mixing, then adding polyethylene glycol 2000, dropwise adding ammonia water with the mass concentration of 25%-28% while stirring, transferring into a reaction kettle for heating after dropwise adding is completed, and then performing centrifugal washing, drying and annealing treatment to obtain black nickel oxide. The flower-like nickel oxide prepared by the method has rich pore diameter structures and large specific surface area, and is beneficial to full contact with gas to be detected; the product is uniform in morphology, uniform and controllable in size, good in dispersity and freeof agglomeration; the yield of the product is high, when the product is used for manufacturing a gas sensitive sensor, the working temperature is low, the selectivity to formaldehyde is high, the sensitivity is high, the sensitivity to formaldehyde gas of 100 ppm or below at the normal temperature can reach 19, the response time is short, the recovery time is short, and the stability performance is good.

Description

technical field [0001] The invention relates to the technical field of preparation of micro-nano structured metal oxides, in particular to a method for preparing flower-like nickel oxide materials composed of porous sheets. Background technique [0002] At present, the gas sensitive material of the metal oxide semiconductor gas sensor for ethanol and most gases should be SnO 2 , ZnO, Fe 2 o 3 、WO 3 、TiO 2 As the main matrix material, these binary oxides are broad-spectrum gas-sensing materials, and they have gas-sensing responses to a variety of gases (such as ethanol, formaldehyde, acetone, hydrogen, etc.), but lack selectivity. [0003] Due to its unique optical and electrical characteristics, nickel oxide has a very wide range of applications in solar cells, gas sensors and other fields. So far, various morphologies of nickel oxide such as nanowires, nanorods, nanobelts, nanotubes, nanosheets, etc. have been reported in the literature. In recent years, micro-nano...

AI Technical Summary

Problems solved by technology

These improvements have made some progress in improving the sensitivity of metal oxide gas-sensitive materials, but their selectivity and response to formaldehyde are still not ideal.

[0004] Based on the current preparation of nickel oxide with irregular morphology, large size distribution span, poor dispersion, low yield, and poor gas selectivity and low sensitivity when nickel oxide is used in the field of gas sensors, the preparation has high selectivity to formaldehyde. , high sensitivity, good stability nickel oxide is of great significance

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