Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: Experimental methods and magnetic imaging
MA 30.8: Vortrag
Mittwoch, 2. April 2014, 17:00–17:15, HSZ 403
Imaging of magnetic protein by NV centre in diamond. — •Anna Ermakova1, Andrea Kurz1, Goutam Pramanik2, Jianming Cai3, Boris Naydenov1, Tanja Weil2, Martin Plenio3, and Fedor Jelezko1 — 1Institute of Quantum Optics, University Ulm, Germany — 2Institute of Organic Chemistry III, University Ulm, Germany — 3Institute of Theoretical Physics, University Ulm, Germany
To determinate the magnetic structure of a protein it is necessary to use an atomic sited and ultrasensitive magnetic field detector, like the nitrogen-vacancy (NV) centre in diamond. NV centre is a stable optical defect having a spin allowing high sensitive magnetic field detection with nanoscale resolution [1,2]. Nanodiamonds with NV centres can be use for the sensing of the protein ferritin, which keep iron (until 4500 iron atoms per one protein) in the blood to produce haemoglobin in further [3].
In our work we used a bulk diamond with shallow implant NV centres (3-5 nm from the surface). We attached ferritin to a silica particle, which was on the end of AFM tip. In this case one can choose the distance between the NV centre and proteins and measure changes of the relaxation times (T1 and T2) of NV.
Here, we present an image of relaxation times of NV*s spin as a function of the position of ferritin on AFM tip. We compare this with previous result [3] to determine the number of iron ions in the protein.
[1] G.Balasubramanian et al. Nature 455, 648-651 (2008); [2] J.M.Taylor, P.Capellaro et al., Nature Physics 4, 810*816 (2008); [3]A.Ermakova et. al., Nano Letters 13(7), 3305-3309 (2013)