4.8 Article

Ferritin-Based New Magnetic Force Microscopic Probe Detecting 10 nm Sized Magnetic Nanoparticles

Journal

ACS NANO
Volume 6, Issue 1, Pages 241-248

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/nn203464g

Keywords

single-molecule functionalized AFM probe; single-molecule picking; atomic force microscopy; magnetic force microscopy; multifunctional probe

Funding

  1. World Class University (WCU) through the National Research Foundation of Korea
  2. Ministry of Education, Science, and Technology [R31-2008-000-10105]
  3. BK21
  4. NRF/MEST [2011-0002186]

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A single-molecule ferritin picking-up process was realized with the use of AFM, which was enhanced by employing controlled dendron surface chemistry. The approach enabled the placement of a single ferritin protein molecule at the very end of an AFM tip. When used for magnetic force microscopy (MFM) imaging, the tips were able to detect magnetic interactions of approximately 10 nm sized magnetic nanoparticles. The single ferritin tip also showed the characteristics of a multifunctional MFM probe that can sense the magnetic force from magnetic materials as well as detect the biomolecular interaction force with DNAs on the surface. The multifunctional tip enabled us not only to Investigate the specific molecular interaction but also to image the magnetic interaction between the probe and the substrate, in addition to allowing the common capability of topographic Imaging. Because the protein engineering of ferritin and the supporting coordination and conjugation chemistry are well-established, we envisage that it would be straightforward to extend this approach to the development of various single magnetic particle MFM probes of different compositions and sizes.

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