Method for preparing ZnO nano-array composite system modified by gold nanoparticles

A technology of zinc oxide nanoparticles and gold particles, which is applied in the process of producing decorative surface effects, decorative arts, gaseous chemical plating, etc., can solve the problems of unsatisfactory sensitivity and selectivity, long response time, and high working temperature , to achieve the effect of good sensitivity and selectivity, wide detection range and low cost

Inactive Publication Date: 2012-01-25
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, for liquefied petroleum gas, the current high-performance gas sensors have not yet achieved satisfactory sensitivi

Method used

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  • Method for preparing ZnO nano-array composite system modified by gold nanoparticles
  • Method for preparing ZnO nano-array composite system modified by gold nanoparticles
  • Method for preparing ZnO nano-array composite system modified by gold nanoparticles

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Embodiment

[0020] A method for preparing a gold particle-modified zinc oxide nano-array composite system, based on the preparation of ZnO nano-sol, through pulling film formation and heat treatment, forming a ZnO nano-particle film in situ on an alumina ceramic tube or a silicon substrate, Then use the nanoparticle film as the seed crystal to epitaxially grow ZnO nanorods in the solution, and then obtain ZnO nanoarrays decorated with nanoscale gold particles by vacuum evaporation. The steps are as follows:

[0021] 1) Add 5.49g zinc acetate Zn(CH 3 COO) 2 2H 2 O was mixed with 250 ml of absolute ethanol, heated at a constant temperature of 90°C under reflux to pre-hydrolyze into Zn 10 o 4 (Ac) 12 , adding 1.5g hydrated lithium hydroxide to continue the hydrolysis reaction, and after magnetic stirring for 2 hours, a colorless and clear zinc oxide sol was obtained;

[0022] 2) Put the alumina ceramic tube into the ZnO sol, grow the ZnO sol protopically on the alumina ceramic tube by p...

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Abstract

The invention relates to a method for preparing a ZnO nano-array composite system modified by gold nanoparticles. The method comprises the following steps: in-situ forming a ZnO nanoparticle film on a Al2O3 ceramic tube or a Si substrate by a film pulling method and heat treatment based on the preparation of ZnO nano-sol; epitaxially growing a ZnO nano-rod in a solution by using the nanoparticle film as seed crystal; and carrying out vacuum evaporation to obtain the ZnO nano-array modified by gold nanoparticles. The method has the advantages that: (1) the method has simple process and low cost and needs no specific modification process in comparison to the common sputtering method; and (2) the material is used for manufacturing a liquefied petroleum gas sensing unit, which has wide liquefied petroleum gas detection range and can show good sensitivity and selectivity at a temperature lower than the work temperature of the conventional sensor. Particularly, the method in the invention facilitates the design of gas sensor array based on a ZnO nanoparticle and is used for monitoring liquefied petroleum gas concentration.

Description

technical field [0001] The invention belongs to the preparation of gas sensing materials, in particular to a preparation method of a zinc oxide nano-array composite system modified by gold particles. Background technique [0002] Zinc oxide is an important wide-bandgap compound semiconductor, which has important application value in the fields of chemical sensors, piezoelectricity, photocatalysis, photoelectric conversion, blue-green light-emitting diodes and lasers. One-dimensional nanomaterials, including nanowires, nanorods, and nanotubes, have been widely used in gas sensors due to their larger specific surface area than thin films. However, for liquefied petroleum gas, the current high-performance gas sensors have not yet achieved satisfactory sensitivity and selectivity, and there are common problems such as high working temperature, long response time, and low sensitivity. The gold nanoparticle sensitization method used in this patent is a high-performance ZnO nanoar...

Claims

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Application Information

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IPC IPC(8): B81C1/00
Inventor 别利剑尹静陈伟良何建群
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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