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Transmission electron microscope technology for in-situ study of three-dimensional distribution structure of nanoparticles

A technology of nanoparticle and three-dimensional distribution, which is applied in individual particle analysis, particle and sedimentation analysis, and preparation of test samples. It can solve problems such as poor dispersion, large particle size of metal catalysts, and difficult size control, and achieve high performance. , to avoid the effect of oxidation

Active Publication Date: 2019-09-06
ZHEJIANG UNIV
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Problems solved by technology

[0005] At present, the methods for preparing supported catalysts mainly include impregnation-liquid phase reduction method, gas phase reduction method, electrochemical deposition method, gel-sol method, etc. Disadvantages such as poor sex

Method used

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  • Transmission electron microscope technology for in-situ study of three-dimensional distribution structure of nanoparticles
  • Transmission electron microscope technology for in-situ study of three-dimensional distribution structure of nanoparticles
  • Transmission electron microscope technology for in-situ study of three-dimensional distribution structure of nanoparticles

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Embodiment 1

[0063] The method for in-situ researching the sintering phenomenon and the three-dimensional distribution of the multi-component alloy nanoparticles loaded on the carbon nanofiber under the action of the electric field under the transmission electron microscope comprises the following steps:

[0064] 1. In order to obtain carbon nanofibers, we use the method of electrospinning. in accordance with figure 1 The schematic diagram of electrospinning shown in the figure shows that before spinning, polyacrylonitrile (PAN) and dimethylformamide (DMF) are mixed according to a certain ratio to form a polymer solution and then loaded into the injector. Then place a substrate for carrying carbon nanofibers at a suitable position on the receiving screen directly opposite the injection port. Choose copper foil or carbon paper as the substrate, but according to experimental experience, due to the relatively high strength of copper foil compared with carbon paper, and weaker bonding with ca...

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Abstract

The invention discloses a transmission electron microscope technology for in-situ study of a three-dimensional distribution structure of nanoparticles. The transmission electron microscope technologyis characterized by comprising the steps of: acquiring carbon nanofibers after carbonization treatment by adopting an electrospinning technique and thermal treatment; loading precursor salt of alloy on the carbon nanofibers; assembling a metal needle tip into a sample rod fixing end of a transmission electron microscope, the carbon nanofibers are loaded with a gold needle platform, and a gold needle is arranged on the movable end of a sample rod; the sample rod loaded with the metal needle tip and the gold needle is inserted into the transmission electron microscope, the height and position ofthe gold needle at the movable end of the sample rod are adjusted, such that the carbon nanofibers on the gold needle platform are in contact with the metal needle tip, a certain voltage is applied within certain instantaneous time, so that the precursor salt loaded on the carbon nanofibers on gold needle platform undergoes an instantaneous carbothermic reaction to form alloy nanoparticles, and the distribution variations and sintering situations of the alloy nanoparticles under the action of a current field are observed; and two-dimensional projection transmission electron microscope pictures are photographed, the electron microscope pictures are subjected to alignment, three-dimensional reconstruction and visualization by means of software.

Description

technical field [0001] The invention relates to a transmission electron microscope technology, in particular to a method for in-situ research on the three-dimensional distribution of multi-component alloy nanoparticles under the action of an electric field under the transmission electron microscope. [0002] technical background [0003] Fossil energy has always been the basis for human survival and supports the rapid development of modern society. But as we all know, fossil energy is a non-renewable energy. With the increasing demand for energy in human society, the international energy situation is becoming increasingly severe. The exhaustion of energy and the environmental pollution caused by the use of fossil energy have attracted widespread attention from all over the world. In order to solve the dual problems of non-renewability and environmental pollution brought about by traditional fossil energy, human demand for new energy is increasing. For example, renewable and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/10G01N1/28
CPCG01N1/28G01N15/10
Inventor 王宏涛梁春园褚雯张奕志刘嘉斌
Owner ZHEJIANG UNIV
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