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A kind of ultra-thin ag nanosheet with clean surface and preparation method thereof

A nanosheet and ultra-thin technology, applied in the field of ultra-thin Ag nanosheets and their preparation, can solve the problems affecting the electrochemical sensing limit and sensitivity, and the surface advantages of Ag nanosheets cannot be fully utilized, and achieve good cycle performance and stability. Performance, high detection limit, high detection sensitivity effect

Active Publication Date: 2019-10-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The residual surfactant on the surface will occupy the active sites, affecting the limit and sensitivity of electrochemical sensing.
[0004] The preparation method of Ag sheet in the prior art (chemical deposition method and from containing Ag + Replacement in the salt solution) It is necessary to add an active agent to control the morphology synthesis, and the remaining active agent on the surface makes the surface advantages of Ag nanosheets unable to be fully utilized.

Method used

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  • A kind of ultra-thin ag nanosheet with clean surface and preparation method thereof
  • A kind of ultra-thin ag nanosheet with clean surface and preparation method thereof
  • A kind of ultra-thin ag nanosheet with clean surface and preparation method thereof

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preparation example Construction

[0021] Another aspect of the present invention provides a kind of preparation method of the ultra-thin Ag nano sheet of clean surface, comprises the steps:

[0022] (1) Add an alkaline solution to a certain concentration of copper salt solution, and then add a reducing agent to make Cu 2+ reduced to Cu + , to obtain cuprous oxide;

[0023] (2) The cuprous oxide that step (1) obtains is put into ethylene glycol solution, adds alkaline solution and reducing agent successively, with Cu + reduced to Cu 0 , to obtain a hollow Cu shell;

[0024] (3) Put the hollow Cu shell obtained in step (2) into a certain amount of silver nitrate solution, stir under normal temperature and pressure, and the Ag + replaced by Ag 0 , collect and dry the gray powder obtained to obtain the ultrathin Ag nanosheets with a thickness of 10-20nm.

[0025] Preferably, the copper salt is copper chloride, copper sulfate or copper acetate.

[0026] Preferably, the alkaline solution is sodium hydroxide. ...

Embodiment 1

[0035] (1) Add 30ml of sodium hydroxide solution (3M) to 50ml of copper chloride solution (0.3M), then add 0.6g of glucose powder, and keep the entire reaction temperature at 70°C. 2+ reduced to Cu + , reacted for 30 minutes to obtain a 26-hedral cuprous oxide.

[0036] (2) Disperse the cuprous oxide of 26-hedron in 180ml ethylene glycol solution, add 60ml of sodium hydroxide solution (5M), then add 60ml of glucose solution (1.1M), the whole reaction temperature remains at 60°C, and Cu + reduced to Cu 0 , and reacted for 120 minutes to obtain a hollow Cu shell.

[0037] (3) Put the hollow Cu shell into a certain amount of silver nitrate solution, wherein the molar ratio of Cu and Ag is 5:7, stir at 550rpm at room temperature at 23°C, and mix Ag + replaced by Ag 0 , centrifuge at 7000rpm for 2 minutes to collect and dry the obtained gray powder to obtain monodisperse ultra-thin nano-Ag sheets with a thickness of about 10 nm.

[0038] The scanning electron microscope pictu...

Embodiment 2

[0041] (1) Add 30ml of sodium hydroxide solution (3M) to 50ml of copper chloride solution (0.3M), then add 0.5g of glucose powder, and keep the entire reaction temperature at 70°C. 2+ reduced to Cu + , reacted for 30 minutes to obtain a 26-hedral cuprous oxide.

[0042] (2) Disperse the cuprous oxide of 26-hedron in 180ml ethylene glycol solution, add 60ml of sodium hydroxide solution (5M), then add 60ml of glucose solution (1.1M), the whole reaction temperature remains at 60°C, and Cu + reduced to Cu 0 , and reacted for 120 minutes to obtain a hollow Cu shell.

[0043] (3) Put the hollow Cu shell into a certain amount of silver nitrate solution, wherein the molar ratio of Cu and Ag is 5:6, and stir at 550rpm at room temperature at 23°C, and the Ag + replaced by Ag 0, centrifuge at 7000rpm for 2 minutes to collect and dry the obtained gray powder to obtain monodisperse ultrathin nano-Ag sheets with a thickness of about 15nm.

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Abstract

The invention provides an ultra-thin Ag nanosheet with a clean surface and a preparation method thereof. The surface of the ultrathin Ag nanosheet has no surfactant. The preparation method of the ultra-thin Ag nanosheet of the present invention utilizes that Cu has higher metal activity than Ag. In the hollow Cu shell structure, no surfactant is added to allow Ag + The ions are replaced under normal temperature and pressure to produce ultra-thin Ag sheets with a thickness of about 10-20nm. The ultra-thin Ag nanosheets not only have an ultra-thin thickness of 10-20nm, but also have a huge surface on the order of microns. When used in the electrochemical detection of hydrogen peroxide content, they have a higher detection limit, a higher detection sensitivity, and a higher Good cycle performance and stability performance.

Description

technical field [0001] The invention relates to the technical field of nano-silver-based materials, and is mainly used in electrochemical sensing and surface-enhanced Raman spectroscopy (SERS), etc., and in particular relates to an ultra-thin Ag nano-sheet with a clean surface and a preparation method thereof. Background technique [0002] As the cheapest noble metal material, silver-based materials can be controllably prepared in various shapes, including nanospheres, nanorods, nanoribbons, and nanodendritic structures. Among them, the two-dimensional material silver nanosheets can transport electrons on the surface faster because of their extremely high surface properties, so Ag nanosheets have excellent electrochemical sensing, surface-enhanced Raman spectroscopy, and catalytic performance. , Widely used in electronics, chemical industry, medical treatment, biology and many other fields. [0003] At present, there are two main ways to synthesize Ag nanosheets: one is che...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24B82Y30/00B82Y40/00G01N21/65
CPCG01N21/658B82Y30/00B82Y40/00B22F9/24B22F1/0551B22F1/054
Inventor 孔春才杨志懋马波杨森
Owner XI AN JIAOTONG UNIV
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