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Tungsten trioxide/titanium dioxide nano heterojunction thin film and preparation and application thereof

A tungsten trioxide and titanium dioxide technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of serious charge recombination and poor film stability, and achieve suitable The effect of large area preparation

Inactive Publication Date: 2016-07-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this modification despite improving the TiO 2 Some deficiencies of the film, but due to the WO 3 Direct exposure to the surface of the medium also gives the modified TiO 2 Thin films have brought disadvantages such as poor stability and serious charge recombination.

Method used

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  • Tungsten trioxide/titanium dioxide nano heterojunction thin film and preparation and application thereof
  • Tungsten trioxide/titanium dioxide nano heterojunction thin film and preparation and application thereof
  • Tungsten trioxide/titanium dioxide nano heterojunction thin film and preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0039] Preparation of WO by chemical bath method 3 Nanosheet film (Zhou Baoxue et al., a kind of WO 3 Nanosheet array film preparation method and its application research, Chinese patent application number: 201510724443.X): in the presence of 0.4gNa 2 WO 4 2H 2 O, 0.15g ammonium oxalate 9mL37% hydrochloric acid, 8mL37% H 2 o 2 and 30mL of ethanol in 30mL of deionized aqueous solution, the tungstic acid film obtained on the conductive glass substrate was obtained in a water bath at 85°C for 200min, and then heat-treated at 500°C for 2h. 3 Nanosheet films (see Figure 4 A). This WO 3 The nanosheet film is placed in an aqueous solution containing 15mM ammonium fluotitanate and 75mM boric acid, and treated at a constant temperature of 35°C for 7h, the film is taken out and rinsed with deionized water for more than 1min, and then dried naturally to obtain nano-WO 3 / TiO 2 heterojunction films.

[0040] From Figure 4 B It can be seen that the prepared nano-WO 3 / TiO 2 ...

Embodiment 2

[0046] Preparation of WO by hydrothermal method 3 Nanosheet film (Zhou Baoxue et al., a tungsten-based tungsten trioxide film and its preparation method and application, Chinese patent authorization number: CN102674463B): an aqueous solution containing 30mM sodium tungstate, 10% polyethylene glycol 300, pH=2.5 As the precursor solution, put the heat-treated tungsten sheet in it, and heat it in water at 180°C for 2h. The obtained film was heat-treated at 500 °C for 2 h to obtain WO 3 Nanosheet films (see Figure 5 A). This WO 3 The nanosheet film is placed in an aqueous solution containing 10mM ammonium fluotitanate and 50mM boric acid, and treated at a constant temperature of 50°C for 1h, the film is taken out and rinsed with deionized water for more than 1min, and the nano-WO is obtained after natural drying. 3 / TiO 2 heterojunction thin film, which also has a uniform TiO 2 Nanothorn structure (see Figure 5 B). The film material can be used as a photocatalytic electr...

Embodiment 3

[0048] Preparation of WO by hydrothermal method 3 Nanorod film (Zhou Baoxue, etc., a tungsten-based tungsten trioxide film and its preparation method and application, Chinese patent authorization number: CN102674463B): an aqueous solution containing 20mM sodium tungstate, 10% polyethylene glycol 300, pH=2.5 As the precursor solution, put the heat-treated tungsten sheet in it, and heat it in water at 180°C for 6h. The obtained film was heat-treated at 500 °C for 2 h to obtain WO 3 nanorod films (see Figure 6 A). This WO 3 The nanorod film was placed in an aqueous solution containing 20mM ammonium fluotitanate and 100mM boric acid, and treated at a constant temperature of 25°C for 70h, the film was taken out and rinsed with deionized water for more than 1min, and the nano-WO was obtained after natural drying. 3 / TiO 2 heterojunction thin film, which also has a uniform TiO 2 Nanothorn structure (see Figure 6 B). The thin film material can be used as a sensing material f...

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Abstract

The invention discloses a tungsten trioxide / titanium dioxide nano heterojunction thin film and a preparation and an application thereof. According to the WO3 / TiO2 nano heterojunction thin film, a nano TiO2 layer is formed on the surface of a WO3 thin film in an epitaxial growth manner on the basis of the double-matching relationship of WO3 and TiO2 energy level matching and lattice matching; and the preparation method comprises the following steps: putting the WO3 thin film into a water solution containing ammonium hexafluorotitanate (10-20mM) and boric acid (50-100mM), and carrying out treatment at a constant temperature of 25-50 DEG C for 1-70 hours; and taking out the thin film, washing the thin film with deionized water for over 1min and carrying out natural drying to obtain the WO3 / TiO2 nano heterojunction thin film. The WO3 / TiO2 nano heterojunction thin film has good visible-light absorption capability, good stability, high photoelectric efficiency and charge transfer efficiency, and can be widely applied to the fields of photocatalysis, photoelectrocatalysis, a photocatalytic wastewater fuel cell, a sensor and the like.

Description

technical field [0001] The invention relates to a nano-heterojunction film material, in particular to a tungsten trioxide / titanium dioxide nano-heterojunction film and its preparation and application, belonging to the technical field of nano-materials and applications. technical background [0002] Tungsten trioxide (WO 3 ) as a relatively cheap n-type semiconductor material, because it has good visible light absorption performance (band gap ~ 2.5-2.7eV, can absorb sunlight with a wavelength of 12%), and good stability under neutral and acidic conditions , non-toxic and other advantages, and has a large hole diffusion distance (~150nm, greater than TiO 2 ~100nm and Fe 2 o 3 ~2-4nm), and widely used in photocatalysis, photocatalysis, photocatalysis waste water fuel cell, COD sensor, pH sensor and gas sensor and other fields. However, WO 3 There are some shortcomings in itself, such as slow charge migration between it and the solution interface, the surface is easily deac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0336B01J23/30
CPCH01L31/0336B01J23/30B01J35/39
Inventor 周保学曾庆意白晶李金花郑景元牛学恒季有知罗涛
Owner SHANGHAI JIAO TONG UNIV
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