A method for in-situ preparation of nanoparticles by transmission electron microscopy

A nanoparticle, transmission electron microscope technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor dispersion, large size of metal catalyst particles, and difficult to control the size, and achieve high performance. performance, the effect of avoiding oxidation

Active Publication Date: 2020-11-17
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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  • A method for in-situ preparation of nanoparticles by transmission electron microscopy
  • A method for in-situ preparation of nanoparticles by transmission electron microscopy
  • A method for in-situ preparation of nanoparticles by transmission electron microscopy

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Embodiment 1

[0048] The method for preparing multicomponent alloy nanoparticles attached to carbon fibers in situ in a transmission electron microscope comprises the following steps:

[0049] 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 carbon fibers, it is easy to occur during spinning and post-heat treatment. The peeling and curling of carbon nanofibers, so...

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Abstract

The invention discloses a method for preparing multi-component alloy nanoparticles loaded on nano carbon fibers in situ by a transmission electron microscope. The method comprises the steps of: obtaining nano carbon fibers subjected to carbonization treatment through the electrospinning technique and heat treatment; loading a precursor salt of an alloy on the nano carbon fibers; mounting a metal needle tip in a fixed end of a sample rod of the transmission electron microscope, loading the nano carbon fibers on a gold needle platform, and mounting a gold needle on a movable end of the sample rod; inserting the sample rod with the metal needle tip and the gold needle loaded into the transmission electron microscope, adjusting the height and position of the gold needle at the movable end of the sample rod, so that the nano carbon fibers on the gold needle platform are in contact with the metal needle tip, and applying a certain voltage within a certain instantaneous time, so that the precursor salt loaded on the nano carbon fibers on the gold needle platform generates an instantaneous carbothermic reaction to form the alloy nanoparticles.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for transmitting electron microscope in-situ nanoparticles. [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 sustainable energy such as solar energy, nuclear energy, wind energy, and tidal energy have attracted the attention of energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9041Y02E60/50
Inventor 梁春园褚雯张奕志王宏涛刘嘉斌
Owner ZHEJIANG UNIV
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