The reporter learned from the University of Science and Technology of China that the team of Professor Du Pingwu of the school used a new strategy to construct the zigzag carbon nanotube fragments for the first time. Carbon nanotubes are a kind of nanomaterials, with light weight and perfect hexagonal structure connection. The C = C covalent bond that constitutes carbon nanotubes is one of the most stable chemical bonds in nature, but the synthesis of carbon nanotubes with a single length and size It is an important challenge for synthetic chemistry and materials chemistry. From the perspective of precise structure control, the bottom-up approach is one of the ideal strategies for controlling the preparation of carbon nanotubes, and can be used as an ideal precursor or template for the preparation of carbon nanotubes. However, the research on the precursor or template of zigzag carbon nanotubes, another major type of carbon nanotubes, is very limited. Reasonable design and construction of carbon nanotube fragments can be used as an ideal precursor or template for the preparation of ultra-pure carbon nanotubes. The skeleton can be extended by π-conjugation, and it is expected that new functional materials close to carbon nanotubes in structure and properties can be obtained. Based on the previous work, the research team successfully connected the precursor of the curved condensed conjugated fragment through a coupling reaction catalyzed by transition metal palladium and nickel, and successfully synthesized a zigzag carbon nanotube bend with two graphene units as end caps. Conjugated fragments, for the first time, a strategy for longitudinally cutting carbon nanotubes to construct primitives was proposed. Combined with theoretical simulation calculations, the selective supramolecular interaction between it and fullerene C70 was studied, and it was found that there is a 1: 1 selective binding phenomenon between it and C70. This method of connecting two graphene units through three curved molecules can directly obtain a nano-cage structure, which provides a new idea for the construction of end-capped zigzag carbon nanotubes. The research results were published in "German Applied Chemistry". (Reporter Wu Changfeng)
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Chinese scholars construct zigzag carbon nanotube fragments for the first time