Journal of Materials Science

, Volume 47, Issue 3, pp 1489–1496 | Cite as

Magnetic field-guided orientation of carbon nanotubes through their conjugation with magnetic nanoparticles

  • Suresh Kumar
  • Harsimran Kaur
  • Harkiran Kaur
  • Inderpreet Kaur
  • Keya Dharamvir
  • Lalit M. Bharadwaj


Low intensity magnetic fields (22mT) rendered by a pair of bar magnets have been used to achieve in situ precise orientation of multiwalled carbon nanotubes (MWCNTs) and their directional deposition on solid substrates. The nanotubes were imparted magnetic characteristics through Fe3O4 (magnetite) nanoparticles covalently attached to their surface. The side walls of nanotubes were first acid oxidized with H2SO4/HNO3 (3:1 v/v) mixture and amine-functionalized magnetic nanoparticles were then interfaced to ends and side walls of the nanotubes through covalent linkages in the presence of a zero length cross linker, 1-Ethyl-3-(3-dimethylaminopropyl) carbodiimide. Fourier transformed infrared spectroscopic investigations affirmed the functionalization of nanostructures and formation of a magnetic nanohybrid. Transmission electron microscopy results revealed the attachment of nanoparticles along the side walls of MWCNTs. A flow cell was utilized to orient magnetic nanohybrid in the desired direction and also to create thin films of aligned MWCNTs. Further, directional assembly of magnetic MWCNTs at different orientation angles on solid substrates was studied by field emission scanning electron microscopy and optical microscopy. The procedure can be scaled to align CNTs on large surface areas for numerous applications, e.g., nanosensors, field emitters, and composites.


External Magnetic Field Flow Cell Optical Polarizer Magnetic Orientation Free Amine Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors acknowledge the support from Department of Information Technology (DIT), Ministry of Information technology (MIT), Govt. of India. The authors are thankful to Er. Dinesh Sharma of Sophisticated Analytical Instruments Facility, Panjab University, Chandigarh, India for TEM measurements. The authors are also thankful to Director CSIO, Chandigarh, India for providing necessary facilities. One of the authors, Suresh Kumar thanks University Grant Commission (UGC), Govt. of India for providing Senior Research Fellowship.


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Suresh Kumar
    • 1
  • Harsimran Kaur
    • 1
  • Harkiran Kaur
    • 1
  • Inderpreet Kaur
    • 1
  • Keya Dharamvir
    • 2
  • Lalit M. Bharadwaj
    • 1
  1. 1.Biomolecular Electronics and NanotechnologyCentral Scientific Instruments Organisation (CSIO)ChandigarhIndia
  2. 2.Department of PhysicsPanjab UniversityChandigarhIndia

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