| Title | Magnetic properties of multiwalled carbon nanotubes as a function of acid treatment |
| Publication Type | Journal Article |
| Year of Publication | 2006 |
| Authors | Ellis, A.V., and Ingham B. |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 302 |
| Issue | 2 |
| Pagination | 378 - 381 |
| Date Published | 2006 |
| ISSN | 03048853 (ISSN) |
| Keywords | Acid treatment, Carbon nanotubes, Fe nanoparticles, Fermi level, Magnetic properties, Magnetic susceptibility, Magnetization, Magnetometers, Paramagnetic contribution, SQUIDs |
| Abstract | We investigate the electronic properties of multiwalled carbon nanotubes both before and after acid treatment with concentrated sulphuric and nitric acids. Magnetic susceptibility measurements were performed using a SQUID magnetometer and show that there is a considerable enhancement in the density of states at the Fermi level. The data shows that the diamagnetic influence from the graphitic nanotubes dominates. We experimentally observe, after acid treatment, that the diamagnetic susceptibility remains unchanged at 5 K but notably decreases at 77 K. We propose the acid treatment has increased the Van Vleck paramagnetic contribution lowering the diamagnetic response from the π-electron orbital magnetisation. The Van Vleck paramagnetic contribution is finite-temperature dependent with a diminishing contribution at higher fields. © 2005 Elsevier B.V. All rights reserved. |
| URL | http://www.scopus.com/inward/record.url?eid=2-s2.0-33645892918&partnerID=40&md5=f367337e431137127ec56279056358a9 |
| DOI | 10.1016/j.jmmm.2005.09.037 |
