Exohedral physisorption of ambient moisture scales non-monotonically with fiber proximity in aligned carbon nanotube arrays

Itai Y. Stein, Noa Lachman, MacKenzie E. Devoe, Brian L. Wardle*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Here we present a study on the presence of physisorbed water on the surface of aligned carbon nanotubes (CNTs) in ambient conditions, where the wet CNT array mass can be more than 200% larger than that of dry CNTs, and modeling indicates that a water layer >5 nm thick can be present on the outer CNT surface. The experimentally observed nonlinear and non-monotonic dependence of the mass of adsorbed water on the CNT packing (volume fraction) originates from two competing modes. Physisorbed water cannot be neglected in the design and fabrication of materials and devices using nanowires/nanofibers, especially CNTs, and further experimental and ab initio studies on the influence of defects on the surface energies of CNTs, and nanowires/nanofibers in general, are necessary to understand the underlying physics and chemistry that govern this system.

Original languageEnglish
Pages (from-to)4591-4599
Number of pages9
JournalACS Nano
Volume8
Issue number5
DOIs
StatePublished - 27 May 2014
Externally publishedYes

Funding

FundersFunder number
National Science FoundationECS-0335765, CMMI-1130437

    Keywords

    • aligned carbon nanotubes
    • ambient physisorption
    • array morphology
    • proximity effects
    • theoretical framework

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