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Vibration-Induced Deagglomeration and Shear-Induced Alignment of Carbon Nanotubes in Air

机译：空气中碳纳米管的振动诱导解团聚和剪切诱导排列

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摘要

Carbon nanotubes (CNTs) are widely known to agglomerate into difficult to separate, 10-100 μm bundles, even after suspension in solution. Here, a dry and rapid (≈10 s) method to deagglomerate bulk, unbound multi-walled CNT bundles due to surface acoustic waves (SAW) in a piezoelectric substrate is reported for the first time. The process first forms 1-μm CNT bundles from extremely large (≈10 Mm/s~2) mechanical accelerations due to the SAW; these bundles are consequently susceptible to SAW-induced evanescent, quasistatic electric fields that couple into the bundles and form a mat of long (1-10 μm) individual CNTs on the substrate surface. These CNTs may then be aligned along the direction of shear provided by sliding a glass cover slip 10 mm across the CNT mat. This alignment is notably independent of the SAW propagation direction. Further, the intrinsic structure of the nanotubes is unaffected as verified using Raman spectroscopy. Uniquely simple, the approach avoids the many shortcomings of other CNT deagglomeration techniques-particularly surface modification and suspension in solution-to rapidly separate and align large numbers of CNTs, thereby overcoming a key limitation in their use for a diverse range of applications.
机译：碳纳米管（CNTs）众所周知，即使悬浮在溶液中，也会聚集成难分离的10-100μm的束。在此，首次报道了一种干燥快速的方法（≈10s），该方法用于去除由于压电基片中的表面声波（SAW）导致的块状，未结合的多壁CNT束团聚。该过程首先由于SAW产生的极大的机械加速度（≈10Mm / s〜2）形成1-μmCNT束；因此，这些束易受SAW引起的van逝准准电场的影响，该电场耦合到束中并在基材表面上形成长（1-10μm）的单个CNT垫。然后，可以将这些CNT沿着在CNT垫上滑动10 mm的玻璃盖玻片所产生的剪切方向对齐。该对准特别地独立于SAW传播方向。此外，如使用拉曼光谱法所证实的，纳米管的固有结构不受影响。该方法非常简单，避免了其他CNT解聚技术的许多缺点-特别是在溶液中进行表面改性和悬浮-快速分离和排列大量CNT，从而克服了它们在多种应用中的主要限制。

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  • 来源
    《Advanced Functional Materials》 |2015年第7期|1014-1023|共10页
  • 作者

    Morteza Miansari; Aisha Qi; Leslie Y. Yeo; James R. Friend;

  • 作者单位

    Micro/Nanophysics Research Laboratory RMIT University Melbourne, VIC 3000, Australia,Department of Mechanical and Aerospace Engineering Monash University Clayton, VIC 3800, Australia;

    Micro/Nanophysics Research Laboratory RMIT University Melbourne, VIC 3000, Australia;

    Micro/Nanophysics Research Laboratory RMIT University Melbourne, VIC 3000, Australia;

    Micro/Nanophysics Research Laboratory RMIT University Melbourne, VIC 3000, Australia,Department of Mechanical and Aerospace Engineering, University of California-San Diego, La Jolla, CA, 92122, USA;

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