Lanthanum molybdate-based nanotube array and preparation thereof

Abstract

The invention discloses a lanthanum molybdate-based nanotube array and a preparation method thereof. The array comprises lanthanum molybdate-based nanotubes, the nanometer pipe diameter is 40 to 100nm, and the thickness of a tube wall is 3 to 10nm. The preparation method comprises the steps as follows: (a) lanthana, an oxide of a lanthanum-position adulterant, or nitrate or acetate, ammonium molybdate and the oxide of a molybdenum-position adulterant, or nitrate or acetate are weighed according to the constituent ratio of (La(2-x)Ax)(Mo(2-y)By)O(9-Delta) and are respectively added in a solvent to prepare a corresponding solution; a lanthanum nitrate solution, a lanthanum-position adulterant solution, a molybdenum-position adulterant solution and citric acid are added in an ammonium molybdate solution which is stirred; then the mixed solution is put at the temperature ranging from 20 to 100 DEG C and is stirred and vaporized until a sol whose concentration is 0.5 to 2M is obtained; (b)an aluminium flake is produced into an alumina template with a through-hole, the pore diameter of which is 40 to 100nm; (c) the alumina template which is used for instilling the sol is sintered for 10 to 12 hours at the temperature ranging from 550 to 650, and a strong alkalis used for eating off the template to produce the lanthanum molybdate-based nanotube array which is especially used as the material for transforming the oxygen concentration and electricity on an oxygen sensor.

Description

technical field [0001] The present invention relates to a kind of nanotube array and preparation method, especially a kind of lanthanum molybdate (La 2 Mo 2 o 9 )-based nanotube array and its preparation method. Background technique [0002] At present, under the circumstances that clean energy and sensors are getting more and more attention, it has become an urgent problem to develop middle and low temperature oxygen ion conductor materials with practical value. In recent years, studies on the newly discovered bulk materials of lanthanum molybdate-based oxygen ion conductor materials have shown that this type of material has excellent medium-temperature oxygen ion conductivity, and thus has the potential to be used in electrochemical devices such as medium-temperature fuel cells and oxygen sensors. It has great potential as a solid electrolyte and electrode material. In addition to lanthanum molybdate-based bulk materials and thin films, which have good application pros...

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Problems solved by technology

However, both the lanthanum molybdate-based medium-temperature ionic conductor material and its preparation method have shortcomings. First, the lanthanum molybdate-based medium-temperature ionic conductor material is in the form of a ceramic block, which restricts the scope of application. When the oxygen sensor is applied, it is difficult to apply because it requires a hollow tubular shape; secondly, the finished product produced by the preparation method is only in the form of a block, and it is impossible to obtain tubular lanthanum molybdate-based materials, especially lanthanum molybdate-based nanotubes array; again, the preparation process is complicated, energy-consuming and time-consuming, which makes it difficult to reduce the production cost, which is not conducive to large-scale industrial production

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