Radiofrequency electric-field heating behaviors of highly enriched semiconducting and metallic single-walled carbon nanotubes

Stuart J. Corr, Mustafa Raoof, Brandon T. Cisneros, Alvin W. Orbaek, Matthew A. Cheney, Justin J. Law, Nadia C. Lara, Andrew R. Barron, Lon J. Wilson, Steven A. Curley

Research output: Contribution to journalArticlepeer-review

Abstract

It is theorized that enhanced thermal heating may result from exposing single-walled carbon nanotubes (SWNTs) embedded in a conductive host to radiofrequency (RF) electric fields. We examine the RF-induced (13.56 MHz) heating behaviors of 95% metallic- and semiconducting-enriched SWNTs (m-/s-SWNTs) suspended in aqueous solutions with varying NaCl molarity (0.001 mM–1 M). The heating effects were only evident for host molarities below 1 mM (equivalent to 0.1 S/m) at which the s-SWNT heating rates dominated those of the m-SWNTs. The heating effects were localized to aligned and aggregated “SWNT ropes” ~1 cm in length that formed in suspension, parallel to the electric-field vector, during the RF exposure. For molarities above 1 mM, no enhancements were evident, owing to the large heating effects of the bulk ionic NaCl suspensions, which were observed in previous studies. Although larger enhancement effects proportional to the host conductivity have been theoretically predicted for m-/s-SWNT suspensions, this was not observed most likely because of the aggregation and screening effects, which diminished the scattered electric field near the m-/s-SWNTs. Our research may further the development of better nanoparticle heating agents for applications such as non-invasive RF-induced cancer hyperthermia. [Figure not available: see fulltext.]

Original languageEnglish (US)
Pages (from-to)2859-2870
Number of pages12
JournalNano Research
Volume8
Issue number9
DOIs
StatePublished - Sep 15 2015

Keywords

  • carbon nanotubes
  • hyperthermia
  • metallic
  • radiofrequency
  • semiconducting

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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