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Titanium oxide nanoparticles with broad-spectrum absorption intermediate band and its preparation method and use
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A titanium oxide nanotube and nanoparticle technology, which is applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of low utilization rate of sunlight and the inability to obtain titanium oxide in the preparation method, and achieve a wide range of applications. Prospect, Efficiency Improvement, Convenience Cost Effect
Inactive Publication Date: 2017-03-01
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Whether the product is used for photocatalytic degradation or for photoelectric conversion of dye-sensitized solar cells, the utilization rate of sunlight is too low; second, the preparation method cannot obtain titanium oxide that can absorb sunlight in a broad spectrum
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Embodiment 1
[0038] The concrete steps of preparation are:
[0039] First mix the titanium dioxide powder with water, and stir evenly to obtain a 5g / L emulsion; wherein, the particle diameter of the titanium dioxide powder is 60nm, and the water is deionized water (or distilled water). Then, a laser with a wavelength of 200nm, a power of 50mJ / pulse, a frequency of 5Hz, a pulse width of 15ns and a spot diameter of 3mm was used to irradiate the emulsion at a temperature of 10°C and stirred for 60min to obtain a colloidal solution. After drying the colloidal solution at a temperature of 60°C, a product similar to figure 1 shown, and as figure 2 with image 3 TiO nanoparticles with a broad absorption intermediate band shown in the curve in .
Embodiment 2
[0041] The concrete steps of preparation are:
[0042] First mix the titanium dioxide powder with water, and stir evenly to obtain a 6g / L emulsion; wherein, the particle size of the titanium dioxide powder is 63nm, and the water is deionized water (or distilled water). Then, a laser with a wavelength of 240nm, a power of 140mJ / pulse, a frequency of 8Hz, a pulse width of 13ns, and a spot diameter of 4mm was used to irradiate the emulsion at a temperature of 7.5°C and stirred for 120min to obtain a colloidal solution. After drying the colloidal solution at a temperature of 70°C, a product similar to figure 1 shown, and as figure 2 with image 3 TiO nanoparticles with a broad absorption intermediate band shown in the curve in .
Embodiment 3
[0044] The concrete steps of preparation are:
[0045] First mix the titanium dioxide powder with water, and stir evenly to obtain an 8g / L emulsion; wherein, the particle diameter of the titanium dioxide powder is 65nm, and the water is deionized water (or distilled water). Then, a laser with a wavelength of 280nm, a power of 230mJ / pulse, a frequency of 10Hz, a pulse width of 10ns, and a spot diameter of 5mm was used to irradiate the emulsion at a temperature of 5°C and stirred for 180min to obtain a colloidal solution. After drying the colloidal solution at a temperature of 80°C, the following figure 1 shown, and as figure 2 with image 3 TiO nanoparticles with a broad absorption intermediate band shown in the curve in .
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Abstract
The invention discloses a titanium dioxide nanoparticle with a wide-spectrum absorption intermediate band and a preparation method and applications thereof. The particle is an amorphous titanium dioxide nanoparticle with a particle size of 20-50 nm and provided with an intermediate band, the intermediate band is located at a position (1.5-1.7 eV) at the top of a valence band, the recombination luminescence waveband between the energy level of the intermediate band and the valence band is 750-790 nm, and the luminescence lifetime is 0.7-2 mu s. The method comprises the following steps: firstly, mixing titanium dioxide powder with water, and uniformly stirring the obtained mixture, so that emulsion with a mass concentration of 5-10 g / L is obtained; irradiating the emulsion for 60-300 min while stirring at a temperature of less than or equal to 10 DEG C by using laser with a wavelength of 200-355 nm, a power of 50-400 mJ / pulse, a frequency of 5-15 Hz and a pulse width of 5-15 ns, so that a colloidal solution is obtained; and drying the colloidal solution, so that a target product is obtained. The nanoparticle has a 250-1800 nm wide absorption spectrum property quite coincident with solar spectral energy distribution, and can be applied to the photocatalytic degradation of organic pollutants or heavy metal ions, or the photoelectric conversion of dye-sensitized solar cells, therefore, the nanoparticle has a broad application prospect in the fields of environmental pollutant control and solar cells.
Description
technical field [0001] The invention relates to a titanium oxide nanoparticle, its preparation method and application, in particular to a titanium oxide nanoparticle with a broad-spectrum absorption intermediate band, its preparation method and application. Background technique [0002] In the 21st century, environmental pollution and shortage of fossil energy have become two important problems that restrict the sustainable development of mankind and need to be solved urgently. As an inexhaustible source of clean energy, solar energy has gradually become an important part of the basic energy structure of human beings in the future. Titanium oxide (TiO 2 ) is an ancient and long-lasting semiconductor material, which is widely used in the field of solar energy utilization such as photocatalytic degradation of pollutants and photovoltaic power generation, and is known as "solar energy material". For this reason, in order to obtain titanium oxide, people have made unremitting ...
Claims
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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06C01G23/047B82Y30/00
Inventor 潘书生刘倩文许思超张云霞李广海
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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