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journal article·2024-09-03Open access

Synthesis of Ultrahigh-Purity (6,5) Carbon Nanotubes Using a Trimetallic Catalyst

Satoru Shiina, Tennpei Murohashi, Koyo Ishibashi, Xing He, Takashi Koretsune, Zheng Liu, Wataru Terashima, Yuichiro K. Kato, Kazutoshi Inoue, Mitsuhiro Saito, Yuichi Ikuhara, Toshiaki Kato

ACS Nano· Volume 18· Issue 35
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Abstract

High Resolution Image Download MS PowerPoint Slide Chirality-controlled synthesis of carbon nanotubes (CNTs) is one of the ultimate goals in the field of nanotube synthesis. At present, direct synthesis achieving a purity of over 90%, which can be called single-chirality synthesis, has been achieved for only two types of chiralities: (14,4) and (12,6) CNTs. Here, we realized an ultrahigh-purity (∼95.8%) synthesis of (6,5) CNTs with a trimetallic catalyst NiSnFe. Partial formation of Ni 3 Sn crystals was found within the NiSnFe nanoparticles. The activation energy for the selective growth of (6,5) CNTs decreased owing to the formation of Ni 3 Sn crystals, resulting in the high-purity synthesis of (6,5) CNTs. Transmission electron microscopy (TEM) reveals that one-dimensional (1D) crystals of periodic strip lines with 8.8 Å spacing are formed within the as-grown ultrahigh-purity (6,5) CNTs, which are well-matched with the simulated TEM image of closely packed 37 (6,5) CNTs with 2.8 Å intertube distance, indicating the direct formation of chirality-pure (6,5)-CNT bundle structures. The photoluminescence (PL) lifetime increases more than 20 times by the formation of chirality-pure bundle structures of (6,5) CNTs compared to that of isolated (6,5) CNTs. This can be explained by exciton delocalization or intertube excitons within bundle structures of chirality-pure (6,5) CNTs.
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Research context

NanomaterialsCatalysis & surfaces

OpenAlex topics: Carbon Nanotubes in Composites · Graphene research and applications · Molecular Junctions and Nanostructures

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Graduate School of Engineering, Tohoku University, 980-8579 Sendai, Japan

Advanced Institute for Materials Research (AIMR), Tohoku University, 980-8577 Sendai, Japan

Department of Physics, Tohoku University, 980-8578 Sendai, Japan

Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 463-8560 Nagoya, Japan

Nanoscale Quantum Photonics Laboratory, RIKEN Cluster for Pioneering Research, 351-0198 Wako, Japan

Quantum Optoelectronics Research Team, RIKEN Center for Advanced Photonics, 351-0198 Wako, Japan

Institute of Engineering Innovation, School of Engineering, The University of Tokyo, 113-8656 Tokyo, Japan

Nanostructures Research Laboratory, Japan Fine Ceramics Center, 456-8587 Nagoya, Japan

Funding

Murata Science and Education Foundation · Sumitomo Foundation · Core Research for Evolutional Science and Technology · Precursory Research for Embryonic Science and Technology · Japan Society for the Promotion of Science · Mitsubishi Foundation · Fusion Oriented REsearch for disruptive Science and Technology · Yazaki Memorial Foundation for Science and Technology · Research Institute of Electrical Communication, Tohoku University

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