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Strontium manganate nanowires and microwires and preparation method thereof

A strontium manganate and nanowire technology, which is applied in the field of nano and micron wire preparation, can solve the problems of easy sintering of samples, high-temperature calcination, and difficulty in realization, and achieve low cost, low reaction temperature, and overcoming difficult doping effects

Active Publication Date: 2016-05-04
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2009, Appl.Phys.Lett. No. 94, page 182506, reported a method for preparing strontium manganate nanobelts, which were prepared by sintering at a high temperature of 800°C. The advantage of this method is that it is easy to form a phase, but it needs high-temperature calcination , high energy consumption, easy sintering of samples and other disadvantages
However, for the synthesis of multi-component substances, due to the easy phase separation in the preparation process, it is difficult to use this method, and there are few related reports. There is no related report on the hydrothermal preparation of strontium manganate nanowires and microwires.

Method used

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  • Strontium manganate nanowires and microwires and preparation method thereof
  • Strontium manganate nanowires and microwires and preparation method thereof
  • Strontium manganate nanowires and microwires and preparation method thereof

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Embodiment 1

[0022] Dissolve strontium salt, manganese salt and lanthanum salt in water at a ratio of 0.3:3:0.7, and stir at room temperature until completely dissolved to form an aqueous solution. Add 24g of mineralizer to the above aqueous solution, and stir evenly at room temperature. The obtained precursor solution was put into a high-temperature hydrothermal kettle, and put into a blast drying oven for reaction, the reaction temperature was 275° C., and the reaction time was 28 hours. After the reaction was completed, it was cooled with the furnace, and the reaction product was taken out, washed with ethanol and deionized water, dried at 100°C, and samples were collected. The prepared sample is observed and tested using a scanning electron microscope and an X-ray diffractometer, according to X-ray diffraction (XRD) ( figure 1 ), where the ordinate is the relative intensity, and the abscissa is the diffraction angle. From the position and relative intensity of each diffraction peak, i...

Embodiment 2

[0024] Dissolve strontium salt and manganese salt in water at a ratio of 1:3, and stir at room temperature until completely dissolved to form an aqueous solution. Add 24g of mineralizer to the above aqueous solution, and stir evenly at room temperature. The precursor solution was put into a high-temperature hydrothermal kettle, and put into a blast drying oven for reaction, the reaction temperature was 275° C., and the reaction time was 30 hours. After the reaction was completed, it was cooled with the furnace, and the reaction product was taken out, washed with ethanol and deionized water, dried at 100°C, and samples were collected. The obtained samples were observed and tested using a scanning electron microscope and an X-ray diffractometer, from the obtained scanning electron microscope (SEM) photos ( Figure 4 ) and energy spectrum analysis ( Figure 5 ) shows that strontium manganate ultra-long nanowires and micron wires have been successfully prepared, with diameters o...

Embodiment 3

[0026] Dissolve strontium salt, manganese salt and lanthanum salt in water at a ratio of 0.3:3:0.7, and stir at room temperature until completely dissolved to form an aqueous solution. Add 24g of mineralizer to the above aqueous solution, and stir evenly at room temperature. The obtained precursor solution was put into a high-temperature hydrothermal kettle, and put into a blast drying oven for reaction, the reaction temperature was 275° C., and the reaction time was 28 hours. After the reaction was completed, it was cooled with the furnace, and the reaction product was taken out, washed with ethanol and deionized water, dried at 100°C, and samples were collected. The prepared sample is observed and tested using a scanning electron microscope and an X-ray diffractometer, according to X-ray diffraction (XRD) ( figure 1 ), where the ordinate is the relative intensity, and the abscissa is the diffraction angle. From the position and relative intensity of each diffraction peak, i...

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Abstract

The invention discloses strontium manganate nanowires and microwires and a controllable hydrothermal preparation method thereof. The chemical formula of strontium manganate is SrMn3O(6-x), and lanthanum doping can be performed within certain range; and the regulation of wire size and doping amount can be realized by changing the conditions such as reaction temperature, time and raw material proportioning, wherein the wire diameter is 50nm-5mum, the length is 40-300mum, and the doping amount is 0-0.25% by weight. The system has excellent specific surface area, ion exchangeability and stability as well as unique molecule-grade tunnel space and has an important application value in the fields such as catalysts, secondary battery electrode materials, adsorbents, molecular sieves and sensors. Meanwhile, the unique magnetic and electrical properties are of important application value in terms of magnetic recording and magnetic sensors. The method has the advantages of easiness, low equipment requirements and low energy consumption and can be applied to the strontium manganate preparation as well as one-dimensional system synthesis of other similar multielement materials, for example, nanowires and microwires of barium manganate, calcium manganate and sodium manganate.

Description

technical field [0001] The invention relates to a preparation method of nano and micro wires, in particular to a preparation method of lanthanum-doped strontium manganate nano wires and micro wires. Background technique [0002] Strontium manganese oxide has a unique asymmetric modulated tunnel structure, MnO 6 The octahedral chains share vertices and edges to form a network tunnel structure. This unique tunnel structure makes strontium manganate have a larger specific surface area, more negative charge, excellent ion exchange performance, good stability and molecular and tunnel space. This unique structure makes it suitable for catalysts , batteries, adsorbents, molecular sieves and other fields have broad application prospects. At the same time, nanostructured manganese oxides have unique magnetoelectric properties and have potential applications in magnetic sensors and magnetic recording devices. [0003] At present, scientists have made some progress in the preparatio...

Claims

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Application Information

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IPC IPC(8): C01G45/12B82Y40/00
CPCC01G45/1207C01P2002/72C01P2002/85C01P2004/03C01P2004/16
Inventor 孔凤玉季凌云宁伟田明亮王芳汪金芝
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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