A strontium-doped lavo 3 Preparation method of nanowire and gas sensor thereof

Abstract

The invention provides a strontium-doped LaVO3 nanowire and a preparation method of a gas sensor for the strontium-doped LaVO3 nanowire. The preparation method mainly comprises the following steps: adding a strontium nitrate solution and a lanthanum nitrate solution into an ammonium metavanadate solution in sequence according to a certain volume ratio to obtain a mixed solution, and adjusting the pH value of the mixed solution to be 4-6.5 by using ammonia water; transferring the mixed solution to a hydrothermal kettle, reacting in an oven at 160 DEG C for 16 hours to obtain a product, and drying the product in a vacuum oven to obtain a strontium-doped LaVO4 precursor; performing heat treatment on the strontium-doped LaVO4 precursor in a tubular furnace in a hydrogen atmosphere at 650 DEG C for 2 hours, and performing furnace cooling to obtain the strontium-doped LaVO3 nanowire. The obtained strontium-doped LaVO3 nanowire is very long and has a remarkable response on ammonia gas at the normal temperature; the resistance of the prepared gas sensor is slightly changed along with the temperature, so that the error caused by the temperature change is effectively avoided and the stability is good.

Description

technical field [0001] The invention belongs to the field of semiconductor nanowire materials, in particular to a strontium-doped LaVO 3 A method for preparing a nanowire, and a method for preparing a gas sensor comprising the nanowire. Background technique [0002] In today's information technology era, sensors, as the main means of obtaining information, have broad application prospects in the Internet of Things, smart home, industrial production, marine development, and health fields, and have been highly valued by researchers from various countries. As a branch of it, gas sensors play an important role in atmospheric monitoring, vehicle exhaust measurement, toxic gas monitoring, and food safety. Commercial gas sensor SnO 2 Most of them are porous sintered, and their specific surface area is limited, and commercial sensors often require heating elements to work, and their resistance changes drastically with temperature, which will affect the accuracy of the test. At pr...

AI Technical Summary

Problems solved by technology

In 2013, Professor Shao Mingwang of Soochow University prepared a new type of indium vanadate one-dimensional nanomaterial by hydrothermal method. This material can effectively detect ammonia and alcohol. However, the length of its nanowire is about 40 microns, and its raw material InCl 3 .4H 2 O is expensive (Shanshan Liu, FeiHu, Jie Zhang, Hanxiao Tang, and Mingwang Shao. ACS Appl. Mater. Interfaces, 5 (2013): 3208-3211)

However, the structure, performance and application fields of ceramic bulk materials, thin-film two-dimensional materials and one-dimensional nanowire materials are very different.

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