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Method for preparing porous nanometer alpha-Fe2O3 hollow spheres and application of hollow spheres to low-temperature alcohol sensitivity

A technology of -fe2o3 and hollow spheres, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of material pollution, cost increase, cumbersome preparation process, etc.

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of preparing hollow spheres usually requires the use of templates, which makes the preparation process cumbersome, and the preparation of the templates increases the cost. At the same time, the process of removing the templates by chemical corrosion or heat treatment may also cause material contamination.

Method used

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  • Method for preparing porous nanometer alpha-Fe2O3 hollow spheres and application of hollow spheres to low-temperature alcohol sensitivity
  • Method for preparing porous nanometer alpha-Fe2O3 hollow spheres and application of hollow spheres to low-temperature alcohol sensitivity
  • Method for preparing porous nanometer alpha-Fe2O3 hollow spheres and application of hollow spheres to low-temperature alcohol sensitivity

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Experimental program
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Effect test

Embodiment 1

[0023] 0.81gFe(NO 3 ) 3 9H 2 O, 0.18gH 2 C 2 o 4 and 0.24gCO(NH 2 ) 2 Dissolve in 40ml deionized water, mix evenly by magnetic stirring for 30min, then transfer to a 60ml hydrothermal kettle. React the mixed solution at a constant temperature of 140°C for 12 hours, take it out and cool it to room temperature, collect the resulting precipitate, wash it, dry it in vacuum at 40°C, and roast it at 300°C with a programmed temperature increase (2°C / min) to obtain nano-α-Fe 2 o 3 Hollow ball material.

Embodiment 2

[0025] To the α-Fe that embodiment 1 makes 2 o 3 The hollow ball material is used for SEM experiment, the sample is stuck on the sample stage, and the test is carried out after vacuum gold plating. The X-650 scanning electron microscope of Hitachi, Japan is used, and the working voltage is 25KV. SEM photos as figure 1 shown.

Embodiment 3

[0027] To the α-Fe that embodiment 1 makes 2 o 3 Perform TEM experiment on hollow spherical material, take a small amount of α-Fe that has been fully ground 2 o 3 The hollow sphere material is ultrasonically dispersed in absolute ethanol, and a small amount of the above-dispersed suspension is dropped on a copper grid with a dropper, dried (~10min), and tested under a Philips T20ST electron microscope with a working voltage of 200kV. TEM photos such as figure 2 shown.

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Abstract

The invention relates to a method for preparing porous nanometer alpha-Fe2O3 hollow spheres and application of the hollow spheres to low-temperature alcohol sensitivity. The porous nanometer alpha-Fe2O3 hollow sphere material is prepared by performing a hydrothermal process on cheap Fe(NO3)3.9H2O, H2C2O4, CO(NH2)2 and deionized water serving as initial raw materials, drying, roasting and the like. In the prepared porous nanometer alpha-Fe2O3 hollow spheres, the average particle size of alpha-Fe2O3 particles is 30nm, the diameter of the hollow spheres is about 1mu m, the pore size distribution is concentrated in the range of 5 to 20nm, and a large number of pores have the size of 10nm. The invention discloses a method for preparing the porous nanometer alpha-Fe2O3 hollow sphere material and an application method of the material to the low-temperature alcohol sensitivity. The method has the advantages that: the alpha-Fe2O3 hollow sphere gas-sensitive material is prepared by a one-pot non-template method, and the method is easy to operate, low in cost, light in environmental pollution, low in energy consumption and high in controllability; in the prepared porous alpha-Fe2O3 hollow sphere material, the alpha-Fe2O3 particles are nanoscale, and the formed hollow spheres have uniform sizes; the prepared gas-sensitive material has high gas sensitivity to ethanol, low operating temperature and high selectivity; and the method is good in industrial application prospect.

Description

technical field [0001] The invention relates to a porous nano-α-Fe 2 o 3 Preparation method of hollow sphere material and its low-temperature alcohol-sensitivity application. Background technique [0002] α-Fe 2 o 3 It is a typical n-type semiconductor with a bandgap of 2.2eV. It has good stability, magnetism, gas-sensing and catalytic properties, and is widely used in pigments, recording materials, imaging, catalysis and gas-sensing materials. As a gas-sensing material, it has unique effects in forecasting and detecting toxic and harmful gases. The gas sensor made of this material has been widely studied due to its advantages of simple structure, good stability, low price and less manufacturing process. With the development of nanotechnology, nano-assembly system has attracted more and more people's attention, and has become a new hotspot in the research of nanomaterials. Nano α-Fe 2 o 3 As a gas-sensitive material, it not only has excellent performance, but also ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y30/00
Inventor 王淑荣张守民郭先芝吴世华
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