Cobalt tetroxide/tantalum pentoxide nano-heterostructure hollow spheres, preparation method and application thereof

Abstract

The invention discloses a cobaltosic oxide / tantalum pentoxide nano heterostructure hollow sphere which comprises a tantalum pentoxide nano particle, wherein a cobaltosic oxide nano particle is attached to the surface of a spherical shell; cobaltosic oxide and tantalum pentoxide form a heterostructure; the spherical shell is 5nm in thickness; the nano particle is 2-10nm in size; and the hollow sphere is 80-500nm in diameter. The nano heterostructure hollow sphere is prepared by different metal ion solutions and subsequent annealing treatment via a template adsorption method. The hollow sphere is 70.6m<2> / g in specific surface area and is in a porous structure. The cobaltosic oxide and tantalum pentoxide nano heterostructure hollow sphere is applied on an electrode plated insulating substrate for directly testing alcohol gas. The hollow sphere overcomes the problem that alcohol cannot be detected directly by the traditional semiconductor metal oxide at room temperature; the hollow sphere is low in production cost; the efficiency is high; and an operation process is simple and controllable.

Description

technical field [0001] The invention relates to the technical field of electronic gas-sensing devices, in particular to hollow spheres with nano-heterogeneous structures of tricobalt tetroxide and tantalum pentoxide, a preparation method thereof and a gas sensor. Background technique [0002] With the rapid development of living standards in recent years, the occupancy rate of private cars is still rising, and traffic accidents follow frequently, among which drunk driving is the chief culprit of traffic accidents. While property poses a huge threat, it also seriously threatens the development of our country's economic level. At the same time, alcohol is a flammable and volatile substance. In factories, the detection of alcohol leakage is of great significance. Therefore, alcohol detectors have great practical value and huge market requirements in life and production. [0003] The equipment that is used to detect the alcohol content in the gas now has: semiconductor type de...

AI Technical Summary

Problems solved by technology

If the stability is not good, even if the sensitivity and selectivity of the sensor are good, it is impossible to carry out practical application

Usually, the sensitivity of the gas sensor will be affected by humidity and time, the greater the humidity or the longer the working or storage time, the worse the stability; that is, the greater the humidity or the longer the working or storage time, the gas sensor The lower the sensitivity and selectivity

Gas sensors with poor stability not only have low reliability of detection results but also greatly increase the manufacturing cost in practical applications

[0010] Proper working temperature is a necessary condition for gas sensors to work effectively. Conventional gas sensors, especially gas sensors with metal oxides as functional materials, often require a higher optimal working temperature (above 200°C, even 400°C above) to achieve the highest detection sensitivity, and working at high temperature for a long time will lead to a decrease in the sensitivity of the sensor, poor selectivity, poor stability or even failure

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