Recently, Professor Yu Shuhong's group at the University of Science and Technology of China successfully designed and controlled macro quantities to prepare a new TexSey@Se core/shell nanowire template. Based on this, a brand new synthesis of a series of metals was established. A general method for selenium-tellurium multiple alloy nanowires. The research results were published in the "Scientific Progress" on November 6th. The first author of the paper was Yang Yuan, a member of the research team. Selenides and tellurides have been widely used in solar cells, thermoelectrics, photocatalysis, and electronic devices due to their excellent optical, electrical, and catalytic properties. Among them, niobium has been listed as a key 16-item by the U.S. Materials Genome Project. One of the clean energy materials. One-dimensional nano-selenides and tellurides have more unique properties than bulk materials (eg, lower thermal conductivity, higher light absorption, etc.), and are therefore highly favored by researchers. As an efficient and simple synthetic method, the template method has been widely used in the preparation of one-dimensional nanomaterials. However, due to the lack of corresponding high-activity templates, the template method is currently limited to the preparation of binary selenides or tellurides. This method cannot be applied to the preparation of metal-selenium-tellurium multiple alloys and composite one-dimensional nanomaterials. Yu Shuhong's research group has been dedicated to the establishment and development of controllable synthesis methodology and macro-preparation of nanostructured units with important functions. In order to solve the bottleneck problem of template synthesis of metal selenide telluride nanomaterials, the researchers based on their previous work in the international development of macro-preparation of superfine germanium nanowires with excellent dispersion, based on selenium-containing powder The hydrazine hydrate solution was used as a source of selenium, and the selenium was successfully grown epitaxially to a macrofabricated ultrafine niobium nanowire under mild conditions. A macro-prepared, well-dispersed, component-adjustable TexSey@ was obtained. Se core/shell nanowires. Because the nanowire has a very high chemical activity and does not contain any metal impurities in the dispersion, it can be used for template preparation of a metal-selenium-tellurium multiple alloy nanowire without any pretreatment. From the zero-valent selenium (niobium) and metal salts as precursors to prepare the corresponding metal selenide (telluride) in aqueous solution, there are two reaction pathways. One is that zero-valent selenium (niobium) is first reduced to a negatively-divalent selenium (niobium) and then compounded with a corresponding metal ion to form a metal selenide (telluride); the other is that the metal ion is first reduced to The metal element is then combined with selenium to form a corresponding metal selenide (telluride). Based on a large number of experiments, the researchers ruled out the possibility that the first mechanism would work in this weak alkaline solution synthesis system. Based on this, using the Nernst equation and related theories of thermodynamics, it was found that the corresponding metal-selenium-tellurium ternary alloy nanowires with the metal activity sequence prior to iron (iron) could not be theoretically prepared in the synthetic system. vice versa. Using core/shell nanowires as templates, they obtained nine ternary metal-selenium-tellurium alloy nanowires, namely AgSeTe, HgSeTe, CuSeTe, BiSeTe, and PbSeTe when only one metal salt was added to the dispersion. , CdSeTe, SbSeTe, NiSeTe, and CoSeTe. In-depth studies have shown that the simultaneous addition of two corresponding metal ion precursors of the above nine metal elements in the nanowire dispersion can produce up to thirty-six metal-selenium-tellurium quaternary alloys or hybrid structures. Nanowires. In this case, when the lattices of the corresponding two ternary alloy components match, a metal-selenium-tellurium quaternary alloy nanowire can be obtained, and vice versa from two ternary metal-selenium-tellurium alloys. Composition of hybrid structure nanowires. Interestingly, when introducing more kinds of metal materials, a multivalent metal-selenium-tellurium alloy nanowire of five or more can be obtained by using the nanowire as a template. Further research shows that this method can realize the composition control of metal-selenium-tellurium alloy nanowires and it is easy to realize large-scale macro-preparation. The universal method of multi-element alloyed metal selenide germanide nanowires established in this study makes it possible to prepare a series of these novel nanowire materials that were difficult to synthesize in the past, and will further investigate the new one-dimensional nanomaterials. Lay a solid foundation for special properties and applications. The above research was supported by the National Natural Science Foundation of China, the Ministry of Science and Technology, the Suzhou Nanometer Science and Technology Collaborative Innovation Center, the Hefei University Science Center, and the key deployment projects of the Chinese Academy of Sciences.
Ge windows used in IR carmera lens, as a protective window
Germanium (Ge) based optical components are widely used for IR applications. Germanium (Ge) is well suited for manufacturing of windows and lenses for IR applications in lasers and optical systems. Ge components are used with AR coatings because of high surface reflectivity of substrate. The high refractive index ensures an exceptional single wavelength performance for a best "best form" singlet constructed from germanium.
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