Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Magnetic Particles in Biomedical Diagnostics and Therapy (jointly with BP,CPP,ST)
MA 7.2: Vortrag
Montag, 11. März 2013, 10:15–10:30, H22
Effect of ferritin on spin of NV centre in diamond — •Anna Ermakova1, Goutam Pramanik2, Jianming Cai3, Boris Naydenov1, Liam McGuinness1, Fedor Jelezko1, Tanja Weil2, and Martin Plenio3 — 1Institute of Quantum Optics, University Ulm — 2Institute of Organic Chemistry III, University Ulm — 3Institute of Theoretical Physics, University Ulm
The nitrogen-vacancy (NV) centre is a stable optical centre in diamond, which also has application in sensing. Spin of NV centre has high sensitivity of the magnetic field and can be use like a magnetic detector with nanoscale resolution [1,2]. Moreover, diamond is a biocompatible material and nanodiamonds (NDs) are known to be non-toxic for a variety of cells [3]. It*s mean that spin properties of nitrogen-vacancy centre in ND can find wide application in medicine diagnostic. In this work we used NDs with 30 nm in size, which were attached with ferritin. Ferritin is hollow protein shells that can store 2500-4000 iron atoms and is 8 nm in diameter. It is a important component of a human blood. Ferritin saves human from toxic free iron atoms and keeps iron to produce haemoglobin in further. One ND has around 10 ferritin molecules. Here, we present the change of relaxation times of spin of NV centre in NDs with attached ferritin. We observed that T1 and T2 of NDs with ferritin molecules are less by five times than of free NDs. We also show the theoretical model which explains these changes. 1) Balasubramanian G. et al. Nature 455 (2008),648-651 2) J.M.Taylor, P.Capellaro et al., Nature Physics,4,810*816 (2008) 3) A.M.Schrand et al., J Phys Chem B, vol.111,No.1(2007),2-7