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Ultra-Thin Double-Walled carbon Nanotubes： A Novel Nanocontainer for Preparing Atomic Wires

Nano Research 2011年第8期4卷 759-766页

作者： Lei Shi Leimei Sheng Liming Yu Kang An Yoshinori Ando Xinluo Zhao Department of Physics and Institute of Low-Dimensional Carbons and Device Physics Shanghai University Shanghai 200444 China Department of Materials Science and Engineering Meijo University Nagoya 468-8502 Japan

Double-walled carbon nanotubes （DWCNTs） with high graphitization have been synthesized by hydrogen arc discharge. The obtained DWCNTs have a narrow distribution of diameters of both the inner and outer tubes, and more than half of the DWCNTs have inner diameters in the range 0.6-1.0 nm. Field electron emission from a DWCNT cathode to an anode has been measured, and the emission current density of DWCNTs reached 1 A/cm2 at an applied field of about 4.3 V/~tm. After high-temperature treatment of DWCNTs, long linear carbon chains （C-chains） can be grown inside the ultra-thin DWCNTs to form a novel C-chain@DWCNT nanostructure, showing that these ultra-thin DWCNTs are an appropriate nanocontainer for preparing truly one-dimensional nanostructures with one-atom-diameter.

关键词： Arc discharge carbon chains double-walled carbon nanotubes field electron emission nanocontainer nanowires

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Chemical bonding in representative astrophysically relevant neutral,cation,and anion HC_(n)H chains

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Chinese Physics B 2022年第12期31卷 156-168页

作者： Ioan Baldea Theoretical Chemistry Heidelberg UniversityIm Neuenheimer Feld 229D-69120 HeidelbergGermany

Most existing studies assign a polyynic and cumulenic character of chemical bonding in carbon-based chains relying on values of the bond *** on our recent work,in this paper we add further evidence on the limitations of such an analysis and demonstrate the significant insight gained via natural bond *** reported results include atomic charges,natural bond order and valence indices obtained from ab initio computations for representative members of the astrophysically relevant neutral and charged HC_(2k/2k+1)H chain *** unravel a series of counter-intuitive aspects and/or help naive intuition in properly understanding microscopic processes,e.g.,electron removal from or electron attachment to a neutral *** that the Wiberg indices adequately quantify the chemical bonding structure of the HC_(2k/2k+1)H chains—while the often heavily advertised Mayer indices do not—represents an important message conveyed by the present study.

关键词： astrophysics interstellar medium(ISM) carbon chains Wiberg and Mayer bond order indices

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Large-scale synthesis of polyynes with commercial laser marking technology

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Chinese Physics B 2022年第12期31卷 425-428页

作者： Liang Fang Yanping Xie Shujie Sun Wei Zi Collaborative Innovation Center of Henan Province for Energy-Saving Building Materials Xinyang Normal UniversityXinyang 464000China Analysis&Testing Center Xinyang Normal UniversityXinyang 464000China

The space-confined synthesis method has been an efficient way for the preparation of linear carbon ***,the large-scale preparation of linear carbon chains still faces many challenges due to the lack of methods for the large-scale synthesis of precursors,such as short carbon chains(polyynes),and regulation technology for the transport of reactants in one-dimensional ***,we report a facile method for the rapid preparation of polyynes in large quantities using a commercial laser marking *** characterizations show that a large number of polyynes,such as C_(8)H_(2),C_(10)H_(2),C_(12)H_(2),and C_(14)H_(2),can be produced by ablating the graphite plate immersed in the organic liquid using a laser marking *** results of in situ Raman spectroscopy investigation of C_(2n)H_(2)-filled single-walled carbon nanotubes further confirm that a variety of polyyne molecules are ***,in situ Raman spectroscopy also shows that the local heating treatment can accelerate the filling process of C_(2n)H_(2)into one-dimensional *** work provides new insights into the study of linear carbon chains and space-confined synthesis methods.

关键词： polyynes carbon chains single-walled carbon nanotubes

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