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Preparation method of nano-scale vanadium oxide with quantum size effect

A size effect, nano-scale technology, applied in the direction of vanadium oxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of low visible light transmittance, limited application, etc., to avoid artificial external force and mechanical The effect of external force, simple process and convenient operation

Active Publication Date: 2016-08-24
CHANGZHOU UNIV
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Problems solved by technology

[0004] But VO 2 The band gap is relatively small, resulting in VO 2 The visible light transmittance is low, VO 2 The color of nano-powder is darker and earthy yellow, which limits its application in energy-saving glass and other fields; in order to improve VO 2 To solve the problem of low transmittance of visible light, this patent proposes to use porous templates to prepare nano-sized VO 2 , exploiting the quantum size effect to expand VO 2 band gap, thereby increasing the transmittance of visible light

Method used

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  • Preparation method of nano-scale vanadium oxide with quantum size effect
  • Preparation method of nano-scale vanadium oxide with quantum size effect
  • Preparation method of nano-scale vanadium oxide with quantum size effect

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Embodiment Construction

[0025] Step 1, prepare large particle size PS microsphere emulsion: prepare PS microsphere emulsion by emulsion polymerization, put 10g of styrene, 0.5g of acrylic acid and 120g of deionized water in a four-necked flask, and stir in a water bath for half an hour Then start heating, after the temperature rises to 70°C, add the initiator solution (0.2g ammonium persulfate and 10g deionized water) dropwise at a rate of 1ml / min with a syringe pump, and continue the reaction for 10 hours after the initiator is completely dropped Filter to obtain PS macrospheres with a particle size of 270nm, a monodispersity index of 0.048, and a solid content of 4.64%.

[0026] Step 2, preparation of PS microspheres with small particle size: at room temperature, dissolve 0.15g of SDS in 90ml of ultrapure water and transfer it to a three-necked flask, and stir for 10 minutes with nitrogen gas, control the stirring speed at 200r / min, heat up to 80°C, once After adding 10ml KPS (0.15g) solution, add ...

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Abstract

The invention relates to a thermochromism nano material, and particularly relates to a preparation method of nano-sized vanadium oxide with a quantum size effect. Compared with conventional silicon oxide spheres as sphere templates, PS microspheres with equivalent particle sizes are adopted as the sphere templates, the same effect as the silicon oxide sphere plates is achieved, the influence on the performance of a vanadium oxide ordered porous membrane is reduced due to the advantage that the PS microspheres are easily removed, and the size of VO2 is controlled by using a porous template, thus the visible light transmittance of the VO2 is increased.

Description

technical field [0001] The invention relates to a thermochromic nanomaterial, in particular to using a porous template to control VO 2 the size of the size to improve the VO 2 visible light transmittance. Background technique [0002] Vanadium dioxide (VO 2 ) is a typical semiconductor-metal phase change material, the bulk phase transition temperature is around 68°C; during the transition from low-temperature semiconductor phase to high-temperature metal phase, the spectral transmittance is in the visible light region (380 nm<λ <760nm) does not change much, but it changes significantly in the infrared region (λ>760 nm), from infrared transparency at low temperature to high infrared reflection at high temperature, especially when the wavelength is greater than 2500 nm, infrared light is basically impenetrable Pass. VO 2 The phase transition temperature can be reduced to 25 by doping o About C; VO 2 This temperature-sensitive material can be used in energy-savi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02B82Y30/00
CPCC03C17/006C03C17/25C03C2217/228C03C2217/425C03C2217/70
Inventor 袁宁一朱冲丁建宁
Owner CHANGZHOU UNIV