Ag-TiO2 composite fiber preparation method

A composite fiber and nanofiber technology, which is applied in fiber processing, spinning solution preparation, fiber chemical characteristics, etc., can solve the problems of lack of control methods, etc., and achieve the effect of simple preparation process, good photoelectric conversion characteristics, and improved photoelectric conversion performance

Inactive Publication Date: 2015-09-23
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, TiO 2 Although there are many preparation methods for nanomaterials, for uniform and ordered one-dimensional TiO 2 The preparation of composite nanomaterials still lacks cheap and effective control methods

Method used

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  • Ag-TiO2 composite fiber preparation method
  • Ag-TiO2 composite fiber preparation method
  • Ag-TiO2 composite fiber preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a Ag-TiO 2 (10wt%Ag) the preparation method of composite fiber, comprises the following steps:

[0029] 1) Preparation of precursor solution

[0030] Solution 1: First, add 40 mg of silver nitrate solid into 8 mL of absolute ethanol to dissolve it with magnetic stirring, and prepare a silver nitrate absolute ethanol solution.

[0031] Solution 2: Dissolve 1 mL of tetrabutyl titanate in 1 mL of glacial acetic acid, and stir for 1 h with magnetic force.

[0032] Then solution 1 was added dropwise to solution 2, then 3g of polyvinylpyrrolidone (PVP) was added, stirred magnetically at room temperature for 6h, and then left to stand for a period of time until the bubbles completely disappeared to obtain a brownish-yellow, transparent, uniform electrospun Silk precursor solution.

[0033] 2) Preparation of precursor fibers

[0034] Prepare silver-doped titanium dioxide nanofibers based on electrospinning technology, transfer the prepared precursor solution into the syring...

Embodiment 2

[0038] This embodiment is basically the same as Embodiment 1, the difference is that Ag-TiO 2 Ag deposition in composite fiber: Ag / TiO 2The mass percentages are 5wt% and 30wt%, respectively; the Ag localized surface plasmon resonance can be adjusted by changing the deposition amount of Ag in the composite fiber to enhance the TiO 2 Light absorption ability, and promote the effective separation of photogenerated electrons and holes, improve Ag-TiO 2 Photoelectric conversion efficiency of photovoltaic materials.

[0039] 4) Photoelectric test

[0040] First, in order to initially reveal the Ag deposition on Ag-TiO 2 The role of semiconductor photoelectric conversion materials, respectively, Ag nanoparticles, TiO 2 Nanofiber, Ag-TiO 2 The composite fiber was modified on the glassy carbon electrode, and the laser at λ=405nm (140mW / cm 2 ) Ag, TiO under irradiation 2 and Ag-TiO 2 The photocurrent response of the modified electrode, such as Figure 3a It can be seen that Ag ...

Embodiment 3

[0042] a Ag-TiO 2 The preparation method of composite fiber, comprises the following steps:

[0043] 1) Preparation of precursor solution

[0044] Solution 1: First, add 40 mg of silver nitrate solid into 10 mL of absolute ethanol with magnetic stirring to dissolve it, and prepare a silver nitrate absolute ethanol solution.

[0045] Solution 2: Dissolve 1 mL of tetrabutyl titanate in 1 mL of glacial acetic acid, and stir for 1 h with magnetic force.

[0046] Then solution 1 was added dropwise to solution 2, then 4g of polyvinylpyrrolidone (PVP) was added, stirred magnetically at room temperature for 8 hours, and then left to stand for a period of time until the bubbles completely disappeared to obtain a brownish yellow, transparent and uniform electrospun Silk precursor solution.

[0047] 2) Preparation of precursor fibers

[0048] Prepare silver-doped titanium dioxide nanofibers based on electrospinning technology, transfer the prepared precursor solution into the syringe...

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Abstract

The invention provides an Ag-TiO2 composite fiber preparation method. The Ag-TiO2 composite fiber preparation method includes the steps of adding silver nitrate absolute ethyl alcohol in a glacial acetic acid solution of tetrabutyl titanate by drops, mixing, adding polyvinylpyrrolidone, stirring and standing until all air bubbles disappear to obtain a polymeric pecursor solution; moving the polymeric pecursor solution in an injector, preparing a nanofiber precursor by means of electrostatic spinning, and baking in the air to obtain an Ag-TiO2 composite fiber. Size and shape of the Ag-TiO2 composite fiber can be controlled by means of adjusting spinning parameters and procedure parameters of electrostatic spinning. A photoelectric property of a material can be optimized by means of adjusting an Ag nanocrystalline deposit rate in the Ag-TiO2 composite fiber. Compared with a TiO2 photoelectric conversion material in the prior art, the Ag-TiO2 composite fiber preparation method has the advantages that the defects of small specific surface area, high photo-generated electron-hole compositing probability rate and low photo-generated carrier quantization efficiency of a TiO2 material are overcome, Ag nanocrystallines in the Ag-TiO2 composite fiber are highly adjustable, and the Ag-TiO2 composite fiber preparation method is simple and easy to repeat.

Description

technical field [0001] The invention relates to nanofiber and nanocrystalline composite materials, the field of photoelectric conversion / energy, in particular to a kind of Ag-TiO 2 Preparation method of composite fiber. Background technique [0002] Titanium dioxide (TiO 2 ) has important application prospects in thin-film solar cells because of its low cost and non-toxicity. Electrodes prepared using their semiconducting properties, as a new type of nanostructured semiconductor, have developed some practical applications in terms of optoelectronic properties. [0003] However, TiO 2 Large band gap (anatase, 3.2ev), low utilization rate of sunlight, and easy recombination of photogenerated electrons and holes limit its large-scale application in the field of optoelectronics. At present, a variety of improved TiO 2 Photoelectric conversion efficiency method. Among them, the metal-semiconductor electrode formed by noble metal deposition can enrich the photo-generated ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D01F8/18D01D1/02D01D5/00
Inventor 王翠娥刘新华
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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