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Gold-tin oxide core shell structure composite nano material and preparing method thereof

A technology of composite nanomaterials and core-shell structure, which is applied in the field of gold-tin oxide core-shell structure composite nanomaterials and its preparation, can solve the problem that the catalytic activity of gold nanoparticles is difficult to exert, gas-sensing functional products cannot be obtained, and the preparation method is cumbersome and complicated etc. to achieve the effects of low production cost, reasonable structure and simple preparation method

Inactive Publication Date: 2016-04-06
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

However, there are deficiencies in both the core / shell nanoparticles and the preparation method. First, the tin oxide shell layer covering the gold nanoparticles is thick and is a dense crystalline layer, which makes the gold nanoparticles efficient. The catalytic activity is difficult to exert; secondly, the preparation method is cumbersome and complicated, time-consuming and energy-consuming, and it is impossible to obtain products with high gas-sensing efficacy

Method used

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  • Gold-tin oxide core shell structure composite nano material and preparing method thereof
  • Gold-tin oxide core shell structure composite nano material and preparing method thereof
  • Gold-tin oxide core shell structure composite nano material and preparing method thereof

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Effect test

Embodiment 1

[0031] The concrete steps of preparation are:

[0032] In step 1, the gold target is first placed in a 0.05 mol / L tin chloride aqueous solution under stirring. Then use a laser with a wavelength of 532nm (or 1064nm), a repetition rate of 1Hz, a pulse width of 15ns, and a power of 40mJ / pulse to irradiate the gold target for 20min; wherein, the laser spot diameter is 0.5mm, and the emission wavelength is 532nm (or 1064nm ) laser is a Nd:YAG solid-state laser to obtain a mixed colloidal solution.

[0033] Step 2, carry out the processing of solid-liquid separation, washing and drying to mixed colloid solution successively; Wherein, solid-liquid separation processing is centrifugal separation, and its rotating speed is 1000r / min, time is 20min, and washing processing is to use deionized water (or ethanol or acetone) to wash the separated solid matter twice, the separation of the solid matter during cleaning is centrifugation, and the drying process is to dry the cleaned solid mat...

Embodiment 2

[0035] The concrete steps of preparation are:

[0036] Step 1, first place the gold target in a 0.08 mol / L tin chloride aqueous solution under stirring. Then use a laser with a wavelength of 532nm (or 1064nm), a repetition rate of 5Hz, a pulse width of 12.5ns, and a power of 60mJ / pulse to irradiate the gold target for 15min; wherein, the laser spot diameter is 1mm, and the emission wavelength is 532nm (or 1064nm ) laser is a Nd:YAG solid-state laser to obtain a mixed colloidal solution.

[0037] Step 2, the solid-liquid separation, washing and drying process are carried out successively to the mixed colloidal solution; Wherein, the solid-liquid separation process is centrifugation, its rotating speed is 3000r / min, the time is 15min, and the washing process is to use deionized water (or ethanol or acetone) to wash the separated solid matter twice, the separation of the solid matter during cleaning is centrifugation, and the drying process is to dry the cleaned solid matter at ...

Embodiment 3

[0039] The concrete steps of preparation are:

[0040] In step 1, the gold target is first placed in a 0.1 mol / L tin chloride aqueous solution under stirring. Then use a laser with a wavelength of 532nm (or 1064nm), a repetition rate of 10Hz, a pulse width of 10ns, and a power of 80mJ / pulse to irradiate the gold target for 10min; wherein, the laser spot diameter is 1.5mm, and the emission wavelength is 532nm (or 1064nm ) laser is a Nd:YAG solid-state laser to obtain a mixed colloidal solution.

[0041] Step 2, the solid-liquid separation, washing and drying process are carried out successively to the mixed colloidal solution; Wherein, the solid-liquid separation process is centrifugation, its rotating speed is 6000r / min, the time is 10min, and the washing process is to use deionized water (or ethanol or acetone) to wash the separated solid matter three times, the separation of the solid matter during cleaning is centrifugation, and the drying process is to dry the cleaned sol...

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Abstract

The invention discloses a gold-tin oxide core shell structure composite nano material and a preparing method thereof. The material is formed in the manner that gold nano particles are coated with tin oxide. The particle size of the material is 12-26 nm, the particle size of the gold nano particles is 10-20 nm, the thickness of a tin oxide layer is 1-3 nm, and the tin oxide layer is composed of oxide tin particles with the particle size of 1-3 nm. The method includes the steps that a gold target is put in a stirred stannic chloride aqueous solution, lasers with the wavelength of 532 nm or 1064 nm, the repetition frequency of 1-20 Hz, the pulse width of 5-15 ns and the power of 40-120 mJ / pulse are used for irradiating the gold target for at least one minute, and a mixed colloidal solution is obtained; and then, the mixed colloidal solution is subjected to solid-liquid separation, washing and drying in sequence, and the target product is obtained. The gold-tin oxide core shell structure composite nano material has higher gas sensitivity and is extremely easily and widely applied to the field of detection of poisonous and harmful gas and flammable and combustible gas in a commercialized manner.

Description

technical field [0001] The invention relates to a core-shell structure composite nano material and a preparation method thereof, in particular to a gold-tin oxide core-shell structure composite nano material and a preparation method thereof. Background technique [0002] Tin dioxide (SnO 2 ) is a typical wide bandgap (3.5eV-3.6eV) N-type semiconductor, which is widely used in gas sensing, photocatalysis, solar cells and surface-enhanced Raman scattering substrates. At present, as the most popular gas-sensing material in research, tin dioxide nanomaterials have broad application value in the detection of toxic, harmful, flammable and explosive gases. However, tin dioxide sensors still have problems such as poor stability, poor selectivity, and high operating temperature in practical applications. In order to solve this problem, people try to improve the gas-sensing performance of tin dioxide sensors by surface modification or bulk doping with a certain proportion of metals,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24
CPCB22F9/24B22F1/07B22F1/16
Inventor 张洪文王莹莹蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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