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journal article·2020-09Open access

Zeolite Nanosheets Stabilize Catalyst Particles to Promote the Growth of Thermodynamically Unfavorable, Small‐Diameter Carbon Nanotubes

Jennifer Carpena‐Núñez, Rahul Rao, Donghun Kim, Ksenia V. Bets, Dmitri N. Zakharov, J. Anibal Boscoboinik, Eric A. Stach, Boris I. Yakobson, Michael Tsapatsis, Dario Stacchiola, Benji Maruyama

Small· Volume 16· Issue 38
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Abstract

Abstract A challenge in the synthesis of single‐wall carbon nanotubes (SWCNTs) is the lack of control over the formation and evolution of catalyst nanoparticles and the lack of control over their size or chirality. Here, zeolite MFI nanosheets (MFI‐Ns) are used to keep cobalt (Co) nanoparticles stable during prolonged annealing conditions. Environmental transmission electron microscopy (ETEM) shows that the MFI‐Ns can influence the size and shape of nanoparticles via particle/support registry, which leads to the preferential docking of nanoparticles to four or fewer pores and to the regulation of the SWCNT synthesis products. The resulting SWCNT population exhibits a narrow diameter distribution and SWCNTs of nearly all chiral angles, including sub‐nm zigzag (ZZ) and near‐ZZ tubes. Theoretical simulations reveal that the growth of these unfavorable tubes from unsupported catalysts leads to the rapid encapsulation of catalyst nanoparticles bearing them; their presence in the growth products suggests that the MFI‐Ns prevent nanoparticle encapsulation and prologue ZZ and near‐ZZ SWCNT growth. These results thus present a path forward for controlling nanoparticle formation and evolution, for achieving size‐ and shape‐selectivity at high temperature, and for controlling SWCNT synthesis.
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Research context

NanomaterialsCatalysis & surfacesMaterials processing

OpenAlex topics: Carbon Nanotubes in Composites · Graphene research and applications · Zeolite Catalysis and Synthesis

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

Affiliations

Materials and Manufacturing Directorate Air Force Research Laboratory Wright‐Patterson Air Force Base Dayton OH 45433 USA

UES, Inc. Dayton OH 45432 USA

Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis MN 55455 USA

School of Chemical Engineering Chonnam National University Buk‐gu Gwangju 61186 Republic of Korea

Department of Materials Science and NanoEngineering Rice University Houston TX 77005 USA

Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA

Department of Materials Science and Engineering University of Pennsylvania Philadelphia PA 19104 USA

Department of Chemistry Rice University Houston TX 77005 USA

Smalley‐Curl Institute for Nanoscale Science and Technology Rice University Houston TX 77005 USA

Applied Physics Laboratory John Hopkins University Laurel MB 20723 USA

Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology Johns Hopkins University Baltimore MD 21218 USA

Funding

Air Force Office of Scientific Research · National Science Foundation

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