High-performance organic semiconductor materials are the core components of organic optoelectronic devices and are the basis for the application of organic optoelectronic devices. Recently, the Honghong Xiang Research Group of the Key Laboratory of Organic Functional Molecule Synthesis and Assembling Chemistry of the Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences has made a series of advances in new high-performance organic semiconductor materials. In response to the current status and challenges of the lack of high-performance n-type organic semiconductors, Li Hongxiang's research group is based on the previous research of thiophene-type n-type organic semiconductors (Chem. Mater. 2011, 23, 1204; Adv. Funct. Mater. 2013, 23, 2277; Chem. Mater. 2014, 26, 5782). The introduction of furan structural units in thiophene-type molecules and the synthesis of furan-thiophene-type n-type organic semiconductor molecules for the first time. The compound shows high electron mobility, and the mobility of the transistor device prepared by the solution method is as high as 7.7 cm2/Vs. Single crystal structure and thin film XRD results show that the furan-thiophene-based molecules exhibit face-to-face π-π stacking in the film, and the direction of π-π stacking coincides with the direction of carrier transport. The above results indicate that the furan-thiophene quinoid molecules are an excellent class of high performance n-type organic semiconductors (Advanced Materials, 2016, 28, 5949). The donor-acceptor conjugated polymers are an important class of polymer semiconductors. The lack of excellent acceptor structural units is one of the bottlenecks constraining the development of new high performance donor-acceptor polymer semiconductors. Li Hongxiang's research group designed and synthesized a series of bis-thiopheneimide polymers based on the work of high-performance thiopheneimide polymer semiconductors in the early stage. Electrochemical and absorption spectra show that these polymers have potential applications in organic transistors and organic solar cells. Thin-film transistors fabricated by the solution method show that the thin-film devices exhibit high-performance bipolar carrier transport characteristics with the highest electron/hole mobility of 1.02/0.33 cm2/Vs. The characterization of the solar cell based on ITO/PEDOT:PSS/Polymer:PC71BM/Ca/Al structure showed that the bisthienimide polymer battery has a high open circuit voltage and photoelectric conversion efficiency with an open circuit voltage of about 1.0 V. The conversion efficiency can reach 6.46 %. The above results indicate that bisthiopheneimides are an excellent class of multifunctional receptor building blocks (Adv. Funct. Mater. 2016, DOI: 10.1002/adfm.201604286). The above research work has been funded by the National Natural Science Foundation of China, the Ministry of Science and Technology and the Chinese Academy of Sciences.
High Temperature Alloy is divided into three kinds of material: 760 ℃ high-temperature material, 1200℃ high temperature and 1500 ℃ high temperature materials, the tensile strength is 800 mpa. On other words,it refers to the metal material worked well in the condition of 760-1500 ℃ or above. It owns excellent high temperature strength, good resistance to oxidation and thermal corrosion resistance, good fatigue properties, fracture toughness and other comprehensive performance, this kind of material has became an irreplaceable key material in military and civilian gas turbine engine hot end components . According to the relevant theory, 760 ℃ high-temperature materials, according to the matrix elements,can be mainly divided into high temperature iron base alloy, nickel base superalloy and cobalt-based super alloy. According to the preparation process,it can be divided into deformation and high temperature alloy, casting high temperature alloy and powder metallurgy super alloy. According to the solid methods,it can be divided into solid solution strengthening, precipitation strengthening and oxide dispersion strengthened with fiber reinforced type, etc.
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