Regensburg 2019 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 12: Poster II
BP 12.7: Poster
Dienstag, 2. April 2019, 14:00–16:00, Poster B2
Fluorescent nanodiamonds as a nanoscopic magnetic field detector — •Frederike Erb and Kay-E. Gottschalk — Institute of Experimental Physics, Ulm University, Germany
Fluorescent nanodiamonds (FNDs) offer various new imaging and metrology approaches, especially in the life sciences. Nanodiamonds containing nitrogen-vacancy centers (NV-centers) as fluorophores emit light in the near-infrared window of bioimaging. Their luminescence properties depend on the environment and thus FNDs can not only be used for bioimaging but also find an application as part of various biosensors. A nanodiamond sensor can be smaller than 50 nm in diameter and read-out optically without contact, also in biological samples. As they are biocompatible and non cytotoxic, they can be used for many experiments in vivo.
We present experiments using the NV-center in nanodiamond as a magnetic field detector. Gd3+ ions in the surrounding of the nanodiamond introduce magnetic field fluctuations, which affect the NV’s spin relaxation time T1 [1]. Reading-out this T1-Time with a commercial confocal microscope gives a measure of the Gd3+ concentration in the sample.
References:
[1] Kaufmann, S. et al. (2013): Detection of atomic spin labels in a lipid bilayer using a single-spin nanodiamond probe. In: Proceedings of the National Academy of Sciences 110 (27), S. 10894-10898.