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Preparation method of tungsten oxide film

A technology of tungsten oxide and tungsten trioxide, applied in measuring devices, instruments, material analysis by optical means, etc., can solve the problems of uneconomical and effective method of high-temperature hydrogen reduction, cumbersome process, expensive equipment, etc., and achieve safe equipment. , the process is simple, the preparation method is simple

Inactive Publication Date: 2018-12-28
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can obtain a tungsten oxide substrate with surface-enhanced Raman scattering function, it also has the disadvantages of cumbersome process, expensive equipment, high-temperature hydrogen reduction method, which is not cost-effective and potentially dangerous.

Method used

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  • Preparation method of tungsten oxide film
  • Preparation method of tungsten oxide film
  • Preparation method of tungsten oxide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The concrete steps of preparation are:

[0032] Step 1, first anneal the ammonium tungstate powder at 300°C for 4 hours; wherein, the particle size of the ammonium tungstate powder is 0.1 μm to obtain tungsten trioxide powder. Then mix the two according to the weight ratio of tungsten trioxide powder and water at a ratio of 0.2:100 to obtain an aqueous solution of tungsten trioxide.

[0033] In step 2, sodium borohydride is first added to the aqueous tungsten trioxide solution, so that the concentration of sodium borohydride in the aqueous tungsten trioxide solution is kept at 0.5 mol / L, and reacted for 5 hours to obtain a reaction solution. Then the reaction solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the speed is 4000r / min, and the time is 10min, and the washing process is to use distilled water and ethanol to separate the solid matter Carry out 2 alternate washings,...

Embodiment 2

[0036] The concrete steps of preparation are:

[0037] Step 1, first anneal the ammonium tungstate powder at 350°C for 3 hours; wherein, the particle size of the ammonium tungstate powder is 0.5 μm to obtain tungsten trioxide powder. Then mix the two according to the weight ratio of tungsten trioxide powder and water at a ratio of 1:75 to obtain an aqueous solution of tungsten trioxide.

[0038] Step 2, firstly add sodium borohydride to the tungsten trioxide aqueous solution, keep the concentration of sodium borohydride in the tungsten trioxide aqueous solution at 1 mol / L, and react for 3.5 hours to obtain a reaction solution. Then the reaction solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the rotation speed is 4500r / min, and the time is 8.75min, and the washing process is to use distilled water and ethanol to separate the solid The solid matter was alternately washed twice, th...

Embodiment 3

[0041] The concrete steps of preparation are:

[0042] Step 1, first anneal the ammonium tungstate powder at 400°C for 3 hours; wherein, the particle size of the ammonium tungstate powder is 1 μm to obtain tungsten trioxide powder. Then mix the two according to the weight ratio of tungsten trioxide powder and water at a ratio of 17:50 to obtain an aqueous solution of tungsten trioxide.

[0043] In step 2, sodium borohydride is first added to the aqueous tungsten trioxide solution, so that the concentration of sodium borohydride in the aqueous tungsten trioxide solution is maintained at 2.5 mol / L, and reacted for 2.5 hours to obtain a reaction solution. Then the reaction solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the rotating speed is 5000r / min, and the time is 7.5min, and the washing process is to use distilled water and ethanol to separate the solid The solids were washed a...

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Abstract

The invention discloses a preparation method of a tungsten oxide film. The preparation method of the tungsten oxide film comprises the following steps: annealing an ammonium tungstate powder first toobtain a tungsten trioxide powder, and then mixing the tungsten trioxide powder and water to obtain an aqueous solution of tungsten trioxide; then, adding sodium borohydride to the aqueous solution oftungsten trioxide first and reacting for 0.5 to 5 hours to obtain a reaction liquid, and then performing solid-liquid separation, washing and drying on the reaction liquid successively to obtain a powdery intermediate product; and finally, dispersing the powdery intermediate product in ethanol first to obtain a dispersion liquid, and coating the dispersion liquid onto a substrate to obtain a target product. The preparation method of the tungsten oxide film has the characteristics of simple and secure process, and low cost of required equipment, and makes the target product very easy to be widely commercialized for rapid trace detection of the rhodamine 6G and 3,3'-diethylthiotricarbocyanine iodine.

Description

technical field [0001] The invention relates to a method for preparing a thin film, in particular to a method for preparing a tungsten oxide thin film. Background technique [0002] Surface-enhanced Raman scattering (SERS) technology refers to the phenomenon that the Raman signal of molecules adsorbed on the surface of nanometer-level rough noble metals such as gold, silver, and copper is greatly amplified, because of its fast, trace, non-destructive It has become a powerful surface analysis tool due to its advantages such as fingerprint recognition of the target, and is widely used in many fields such as electrochemistry, surface science, catalysis, medical testing, and biological food testing. In SERS detection, noble metal nanomaterials are generally used as Raman active substrates. The key to preparing noble metal Raman substrates with high SERS activity is to precisely control the structure of noble metal nanomaterials, and the preparation process of SERS substrates wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 赵倩张洪文刘广强蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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