A kind of titanium dioxide photocatalytic thin film of three-layer structure and preparation method thereof

A technology of photocatalytic thin film and three-layer structure, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of difficult application and instability, and achieve high efficiency Effects of light absorption, improved mobility, and good practical value

Active Publication Date: 2022-04-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, methylamine lead iodide is a very unstable material, which will decompose in the presence of water vapor or temperature rise, making its practical application very difficult

Method used

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  • A kind of titanium dioxide photocatalytic thin film of three-layer structure and preparation method thereof
  • A kind of titanium dioxide photocatalytic thin film of three-layer structure and preparation method thereof
  • A kind of titanium dioxide photocatalytic thin film of three-layer structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The bottom and top layers are pure titanium dioxide sputtering: using TiO 2 Ceramic target, the substrate temperature is 80°C, the total pressure of oxygen-argon mixed gas is 0.3Pa, where O 2 The ratio of partial pressure to the total air pressure is 1.0%, the sputtering time is 60min, the sputtering power is 120W, and the sputtering power density is 42.5kW / m 2 .

[0031] Middle perovskite layer CH 3 NH 3 PB 3 Preparation: PbI first 2 Deposited on the underlying TiO by thermal evaporation 2 Above, put the sample into a sealable glass container in the vacuum chamber, and put CH at the opposite position of the sample. 3 NH 3 I, close the glass container (the glass container is in a vacuum state at this time). Insulate at 120°C for 60 minutes. The preparation conditions are as follows: the evaporation boat is a molybdenum boat, and the PbI 2 The amount is 0.3g, the evaporation current is 100A, the time is 2min, CH 3 NH 3 The amount of I was 0.5 g.

[0032] The...

Embodiment 2

[0034] Change both bottom and top layers of pure titania to Mo:TiO 2 layer, wherein the Mo / Ti atomic ratio in the Mo-doped titania ceramic target is about 0.5%, and other equipment conditions are the same as in Example 1.

[0035] The test results of photocurrent density and photocatalytic degradation performance of samples under ultraviolet-visible light are as follows: image 3 (a), image 3 (b) shown. Three-layer Mo:TiO 2 -CH 3 NH 3 PB 3 -Mo:TiO 2 The photocurrent of the film sample is about 8.2×10 -4 A / cm 2 , is the same thickness as Mo:TiO 2 Thin film (photocurrent about 8×10 -5 A / cm 2 ) 10.3 times that of pure TiO with the same thickness 2 Film light 13.7 times. The photocatalytic degradation rate constant of the three-layer sample is -0.022, and the same thickness of Mo:TiO 2 The film is about -0.013, and the photocatalytic degradation rate is Mo:TiO 2 1.7 times that of thin film, is pure TiO 2 2 times that of film.

Embodiment 3

[0037] The bottom and top layers of Mo:TiO 2 The sputtering power in the preparation conditions of the layer is changed to 200W, and the sputtering power density is 70.8kW / m 2 . Other conditions are with embodiment 2.

[0038] The test results of photocurrent density and photocatalytic degradation performance of samples under ultraviolet-visible light are as follows: Figure 4 (a), Figure 4 (b) shown. Three-layer Mo:TiO 2 -CH 3 NH 3 PB 3 -Mo:TiO 2 The photocurrent of the film sample is about 8.6×10 -4 A / cm 2 , is the same thickness as Mo:TiO 2 Thin film (photocurrent about 8×10 -5 A / cm 2 ) 10.8 times that of pure TiO with the same thickness 2 Film light 14.3 times. The photocatalytic degradation rate constant of the three-layer sample is -0.026, and the same thickness of Mo:TiO 2 The film is about -0.013, and the photocatalytic degradation rate is Mo:TiO 2 Twice as thin film, is pure TiO 2 2.4 times that of film.

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Abstract

The invention belongs to the technical field of photocatalytic thin films, specifically TiO with a three-layer structure 2 Photocatalytic thin film and its preparation method. In the photocatalytic film of the present invention, the bottom layer is Mo-doped TiO 2 film, the middle layer is a methylamine lead iodide perovskite film, and the top layer is Mo-doped TiO 2 Thin film; wherein the Mo doping concentration of the bottom layer and the top layer are the same or different. The present invention adopts the gas phase deposition technology under the full vacuum environment, utilizes magnetron sputtering and vacuum evaporation method to prepare the TiO of three-layer structure 2 Photocatalytic film. The invention introduces methylamine lead iodide perovskite type narrow bandgap material into Mo-doped TiO 2 As an intermediate layer, the thin film can generate a large number of electron-hole pairs under visible light; and use the Fermi level difference between the multilayer thin film layers to implant multiple adjustable built-in electric fields in the thin film, effectively increasing the current carrying capacity. child mobility. The resulting multilayer TiO with high light absorption and photocatalytic activity 2 Film, has very good practical value.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic thin films, in particular to TiO with a three-layer structure 2 Photocatalytic thin film and its preparation method. Background technique [0002] Photocatalysis has become an ideal environmental pollution control technology and clean energy production technology because of its unique properties such as deep reaction at room temperature and direct use of sunlight as a light source to drive the reaction. Among many photocatalysts, TiO 2 Excellent optical properties, strong light corrosion resistance, stable chemical and mechanical properties, low price, and non-toxic to the human body, so it has been favored by people and has broad application prospects. However, due to TiO 2 The bandgap is wider (anatase E g =3.20eV), which determines that it can only absorb ultraviolet light or the ultraviolet part of sunlight, so it expands its light absorption range and improves TiO 2 Catalytic acti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J35/06B01J31/22B01J21/06B01J31/38B01J37/34B01J23/28C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
Inventor 沈杰尹延林薛丹妮
Owner FUDAN UNIV
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