Hypovanadic oxide-based composite film with adjustable radiance and preparation method thereof

Abstract

The invention discloses a hypovanadic oxide-based composite film with adjustable radiance and a preparation method thereof. The hypovanadic oxide-based composite film comprises a transparent underlay and a composite film; the composite film comprises a hypovanadic oxide film positioned on the underlay and a conductive metal film positioned on the hypovanadic oxide film; the composite film also comprises an inorganic transparent film; the thickness of the conductive metal film is between 2 and 30 nanometers; metal particles exist in a continuous particle form; and an inert transition layer is deposited on the transparent underlay. The preparation method disclosed by the invention has a simple process; and on the premise of keeping the thermochromism performance of the hypovanadic oxide, the obtained hypovanadic oxide-based composite film can effectively reduce the radiance of low-temperature phase thereof, is favorable for improving the thermal insulation performance of the low-temperature phase, and enlarges the application range of the hypovanadic oxide-based composite film serving as an energy-saving window.

Description

technical field [0001] The invention belongs to the field of inorganic energy-saving materials, and in particular relates to a vanadium dioxide-based composite thin film with adjustable emissivity and a preparation method thereof. Background technique [0002] my country is an energy-short country. The proportion of crude oil imports has reached 48.5% in 2008, and it is increasing year by year. The energy supply situation is tense. Among all kinds of energy consumption, building energy consumption accounts for 30% of the total energy consumption, and the energy consumption per unit building area is 2 to 3 times that of developed countries, resulting in serious energy waste. [0003] Glass consumes the most energy in buildings. The glass area accounts for about 15% of the building area, while the heat lost through ordinary glass reaches 70%. The reason is that ordinary glass does not have the ability to regulate light transmission. In summer, a large amount of near-infrared ...

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Problems solved by technology

[0006] Although the vanadium dioxide film can effectively control the infrared light transmittance, the emissivity of the low-temperature phase is still high, and the radiation heat dissipation is more, which is not conducive to heat preservation in winter

According to the literature (Valkonen, E.; Karlsson, B.; Ribbing, C.G. Solar Energy 1984, 32, 211), when the homogeneous metal film is changed into discontinuous metal nanoparticles, the metal nanoparticles will show low reflection, High absorption characteristics; and its metal nanoparticles realize localized absorption from visible to near-infrared, according to literature (Karlsson, B.; Valkonen, E.; Karlsson, T.; Ribbing, C.G.Thin Solid Films 1981, 86, 91. and Morris, J.E.; Coutts, T.J.ThinSolid Films 1977, 47, 3.) and the Chinese National Standard (GB / T 2680-94), it can be seen that the local modification in the visible to near infrared will not affect the emissivity of the film layer , that is to say, the metal nanoparticle layer in the thermochromic glass with spectral local modification in the patent application CN 101205120A has no obvious emissivity suppression effect

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