The hottest nano characterization technology has m

2022-09-27
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New breakthroughs have been made in nano characterization technology

After more than 20 years of research, Professor fangkeming, doctoral tutor of the school of metallurgy, University of science and Technology Beijing, has made a new breakthrough in nano characterization technology, and has explored a new method to characterize nano materials with transmission electron microscope or high-resolution electron microscope. This technology uses metal embedding method to cut nano scale films from nano materials, and then use transmission electron microscope or high-resolution electron microscope to study the micro morphology and microstructure of nano materials. The success of this technology provides an important means of detection for the development of nanotechnology in China. It won the gold medal award of the 12th National Invention Exhibition and obtained national patents. At present, it is at the leading level in this field at home and abroad

nanomaterials include nanoparticles and materials based on nanoparticles; Nanofibers and materials containing nanofibers; Nano interfaces and materials containing nano interfaces. The properties of nano materials have an important relationship with their microstructure. Therefore, the study of the characterization of the microstructure of nano materials is of great significance for understanding the characteristics of nano materials and promoting the application of nano materials

Transmission electron microscope is one of the important instruments for studying materials, and it is no exception in the basic research, development and application of nanotechnology. However, when using transmission electron microscope to study the microstructure of materials, the samples must be nano thick films that can be penetrated by transmission electron microscope electron beam. The nanoparticles or nanofibers of monomers can be directly penetrated by the electron beam of transmission electron microscope. Researchers usually place the sample directly on the micro grid for transmission electron microscope observation. However, because nanoparticles or nanofibers are easy to agglomerate, ideal results are often not obtained by this method, and some research contents are difficult to implement. For example, it is difficult to study the surface modification of nanoparticles and the cross-section of nanofibers, and it is more difficult to study the interface problem. Therefore, the sample preparation of nano materials is an important topic worthy of discussion. In this regard, Professor Fang Keming conducted research and explored a more applicable sample preparation method. This method can directly cut the film that can be studied by transmission electron microscope from nano particles or micron particles, and it also has high efficiency for the preparation of samples for the observation of the cross section of nanofibers or the nano interface

this technology is characterized by directly cutting films that can be studied by transmission electron microscopy or high-resolution electron microscopy from nano or micron scale samples. The sample can be simple particles or coated particles after surface modification. For fibrous samples, both transverse and longitudinal films can be cut. For samples with interfaces or nano multilayers, this technology can prepare TEM samples for plastic tensile testing machine to study the interface structure. Another important feature of the technique is that it does not damage the original structure of the specimen. During the film making process, do not use high temperature, do not contact acid and alkali, and do not contact water or aqueous solution when necessary

at present, the above technology has been applied to a number of research topics, such as: Research on the assembly process of semiconductor nanoclusters in zeolite particles; High resolution electron microscopy study of the microstructure of carbon nanofibers; Characterization of microstructure and size of nanoparticles; Transmission electron microscope study of the interlayer structure of multilayer films; Study on surface modification of powder particles; Study on the oxygen permeation layer and dielectric film of tantalum powder particles in capacitors; Study on the microstructure of various graphite in cast iron, etc

this technology has been widely used throughout the country, providing technical support to hundreds of new materials research groups and enterprises such as Peking University, Tsinghua University, Chinese Academy of Sciences, etc. It provided an important method for the in-depth study of high-tech materials in China last year, which attracted attention at home and abroad

nano characterization technology is a cross fusion technology of basic theoretical research and practical application of high-tech materials. It plays an important role in promoting the development of China's high-tech material industry. If this new technology can get the attention of relevant departments and be popularized and applied more widely in the country, it will accelerate the research process of high-tech materials in China and make greater contributions to the development of high-tech industry in China

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