Self-doped nano composite photothermal conversion coating and preparation method thereof

Abstract

The invention provides a self-doped nano composite photothermal conversion coating. The self-doped nano composite photothermal conversion coating comprises a diffusion impervious layer, a self-doped composite absorbing layer and an antireflection layer which are sequentially arranged on a substrate from bottom to top; the self-doped composite absorbing layer is a composite layer obtained by dopingdifferent contents of plasma tungsten nano particles on a tungsten oxide matrix, the self-doped composite absorbing layer is prepared by limited reactive sputtering, in a preparation process, limitedoxygen atoms only react with part of tungsten atoms to form tungsten oxide, thus, the plasma tungsten nano particles are doped into the tungsten oxide matrix, and a self-doped absorbing coating is formed; transition metal tungsten has perfect energy gap, after oxide of the transition metal tungsten is doped, the oxide can become a material with excellent absorbing performance; the composite absorbing layer has a double-layered gradient structure, due to the interference effect of light, the gradient structure can effectively absorb sunlight, and the light absorbing efficiency of the coating is enhanced; and meanwhile, during preparation, only one metal tungsten target is deposited on substrate by a magnetron sputtering method, a preparation process of the coating is greatly simplified, and the self-doped nano composite photothermal conversion coating is suitable for low-cost and large-scale industrialized production.

Description

technical field [0001] The invention relates to the field of solar heat collectors, in particular to a self-doping nanocomposite light-to-heat conversion coating and a preparation method thereof. Background technique [0002] Solar energy is a typical clean and environmentally friendly energy source, which can be used as an alternative energy source to solve environmental pollution and energy crisis. Photothermal conversion is the conversion of absorbed incident solar radiation into thermal energy. In recent years, it has been widely used in solar hydrothermal, seawater desalination, medium temperature (100-400°C) industrial applications, solar thermal power generation and other applications. In solar thermal technology, the light-to-heat conversion efficiency mainly depends on the solar-to-heat conversion coating. In fact, the performance of the light-to-heat conversion coating is usually affected by the coating material, structure and preparation process. In order to obta...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a self-doping nano-composite light-to-heat conversion coating and its preparation method, which solves the problem of using two or more targets at the same time during the preparation process of the existing light-to-heat conversion coating Sputtering makes the preparation process of the light-to-heat conversion coating complicated, which inevitably increases the preparation cost and is not conducive to large-scale industrial production.

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