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    Home > JACS: "polymer synthesis" lighting graphene -- ring π extended polymerization to build graphene nanobelts

    JACS: "polymer synthesis" lighting graphene -- ring π extended polymerization to build graphene nanobelts

    • Last Update: 2020-01-22
    • Source: Internet
    • Author: User
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    1、 Background graphene is a kind of two-dimensional carbon nano material with honeycomb lattice composed of carbon atoms and SP 2 hybrid orbital Graphene nanobelts (nanobelts) with nanometer width have attracted more and more attention due to their unique electrical, optical and spintronic characteristics The properties of graphene nanoribbons (GNRs) depend largely on the width, edge structure and length of the material Therefore, it is very important to accurately synthesize GNRs with the same structure At present, there are two main ways to synthesize GNRs: top-down and down-top GNRs with sub nanostructures can be synthesized from top to bottom, but there are still some problems to be solved For example, the width and edge structure of GNRs are chaotic, and even have serious defects On the contrary, GNRs with definite structure (length, width and edge structure) can be prepared by the bottom-up method (solution phase synthesis or surface synthesis), especially the solution phase synthesis method has very important application At present, solution phase synthesis mainly uses Suzuki miyaara reaction to synthesize armrest GNRs However, the synthesis of arch GNRs is rare 2、 Recently, Professor Kenichiro Itami of Nagoya University and Professor HIDETO Ito of Japan have successfully constructed the arch GNRs by using the apex method The related research work was published on J am Chem SOC (DOI: 10.1021 / JACS 9b11328) (photo source: J am Chem SOC.) 3 The method of cyclic π - extended polymerization is an effective method for the rapid synthesis of graphene nanoparticles and π - extended heteroaromatics Apex reaction can be considered as an effective route for the reaction of non functional aromatic compounds with π extension reagent to construct a new condensed aromatic hydrocarbon The specific synthesis route is the coupling reaction between the K position of the ring aromatic hydrocarbon without functional group and the derivative of dibenzosilane under the catalysis of PD and o-chloroaniline The synthesis of GNRs with arch structure was realized by using the above apex reaction (photo source: J am Chem SOC.) in order to realize the step-by-step polymerization of apex, the author designed the reaction of aromatic compound 1 with dimethylsilicon bridge, in order to realize the preparation of arch GNRs 2 by homopolymerization of monomer 1 The author found the best reaction path through the investigation of Pd catalyst and silver reagent After that, the polymer was confirmed to be homopolymer of compound 1 by MALDI-TOF, IR, UV and Raman analysis (photo source: J am Chem SOC.) (photo source: J am Chem SOC.) next, the author observed the prepared polymer by atomic force microscope (AFM) When the polymer 2a with molecular weight of 1.6 * 105 DA and molecular weight distribution of 1.21 is dissolved in 1,2,4-trichlorobenzene at room temperature, and added to the surface of high heat hydrolyzed graphene (HOPG) drop by drop After the sample is stable for tens of seconds, the arched GNRs can be prepared by blowing out the solvent with nitrogen AFM shows that the thickness of the material is about 0.4nm, which is almost the same as that of the graphene monolayer, and that the spacing width is about 8nm without considering the substrate condition, which may have a great relationship with the polymer structure (photo source: J am Chem SOC.) in addition, the author also carried out alternating copolymerization and coupling reaction with aromatic hydrocarbon by using silica coupling agent, in order to obtain arched GNRs Unfortunately, due to the possible desilication of reagent 5, the molecular weight of the prepared polymer is low However, spectral analysis can also confirm that materials 6 and 8 have arched regions (photo source: J am Chem SOC.) 4 Research conclusion the author has successfully constructed GNRs with arch structure by using apex.
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