Preparation method of noble metal-doped flower-like cuo nanomaterial and method for preparing gas sensor

Abstract

The invention discloses a preparation method of a noble metal doped flower-like CuO nano material and a method for preparing a gas-sensitive element from the same. The preparation method comprises the following steps: preparing a copper salt solution; dissolving 0.05-0.1g of noble metal salt in 6-10ml of HCl (0.2-1mol) to prepare a noble metal precursor solution of 1-2mmol / L; mixing 20-50ml of the copper salt solution with 12.62-15g of hexamethylenetetramine, and adding the obtained mixture into 0-15ml of the noble metal precursor solution of which the concentration is 1mmol / L to obtain a blue solution; sub-packaging the blue solution into a reaction kettle to perform reaction for 6-12h at the hydrothermal temperature of 100-180 DEG C, cooling the material to room temperature, then performing centrifugation for three times under the condition that the rotational speed is 8000-10000r / min, and performing drying in a drying oven at 60-80 DEG C to obtain a noble metal doped CuO nano material; and grinding the noble metal doped flower-like CuO nano material with deionized water in a mortar until the nano material and the deionized water are fully mixed, uniformly painting the mixture on an electrode, calcining the electrode in a muffle furnace at 400-500 DEG C for 2-4 hours, welding the electrode to a circuit board base after cooling, and performing aging for one week for testing. The noble metal catalyst prepared by the method disclosed by the invention greatly improves the catalytic performance and stability of a sensor.

Description

technical field [0001] The invention relates to a preparation method of a CuO nanometer material, in particular to a preparation method of a noble metal-doped flower-like CuO nanometer material and a method for preparing a gas sensor. Background technique [0002] Hydrogen sulfide (H 2 S) is a colorless, toxic, flammable, and harmful gas with the smell of rotten eggs. It has many sources, such as bacterial decomposition of organic matter and waste generated by humans and animals, food processing, cooking, and industrial paper mills. , tanneries and refineries and other industrial activities. When the environment H 2 When the concentration of S gas is greater than 10ppm, it will cause great harm to the human body, and the human body will inhale H 2 After S gas, it will damage the respiratory system, and quickly combine with the hemoglobin in the human body, thereby preventing the transmission of oxygen to the vital organs and tissues of the body, and in severe cases, it wi...

AI Technical Summary

Problems solved by technology

However, the gas-sensing performance of unmodified pure CuO is poor, and further modification and morphology control of CuO materials are required; Pd, as a commonly used noble metal catalyst, has high chemical catalytic performance, and by doping CuO materials A certain mass fraction of noble metal catalyst Pd or Pt can change the morphology of CuO nanomaterials, improve the uniformity of CuO nanoflower particles, and significantly improve the gas sensor’s sensitivity to H 2 The sensitivity and selectivity of S reduce the operating temperature of the sensor; therefore, gas sensors based on Pd or Pt-doped flower-like CuO nanomaterials are expected to become a new H 2 S gas sensor

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