ROS evaluation for a series of CNTs and their derivatives using an ESR method with DMPO

S. Tsuruoka, K. Takeuchi, K. Koyama, T. Noguchi, M. Endo, F. Tristan, M. Terrones, H. Matsumoto, N. Saito, Y. Usui, D. W. Porter, V. Castranova

Research output: Contribution to journalConference articlepeer-review

15 Scopus citations


Carbon nanotubes (CNTs) are important materials in advanced industries. It is a concern that pulmonary exposure to CNTs may induce carcinogenic responses. It has been recently reported that CNTs scavenge ROS though non-carbon fibers generate ROS. A comprehensive evaluation of ROS scavenging using various kinds of CNTs has not been demonstrated well. The present work specifically investigates ROS scavenging capabilities with a series of CNTs and their derivatives that were physically treated, and with the number of commercially available CNTs. CNT concentrations were controlled at 0.2 through 0.6 wt%. The ROS scavenging rate was measured by ESR with DMPO. Interestingly, the ROS scavenging rate was not only influenced by physical treatments, but was also dependent on individual manufacturing methods. Ratio of CNTs to DMPO/ hydrogen peroxide is a key parameter to obtain appropriate ROS quenching results for comparison of CNTs. The present results suggest that dangling bonds are not a sole factor for scavenging, and electron transfer on the CNT surface is not clearly determined to be the sole mechanism to explain ROS scavenging.

Original languageEnglish (US)
Article number012029
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 2013
Event3rd International Conference on Safe Production and Use of Nanomaterials, Nanosafe 2012 - Grenoble, France
Duration: Nov 13 2012Nov 15 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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