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BP: Fachverband Biologische Physik
BP 20: Poster VIII
BP 20.12: Poster
Dienstag, 17. März 2020, 14:00–16:00, P2/4OG
Fluorescent nanodiamond as a detector for magnetic field fluctuations — •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 cannot only be used for bioimaging but also find an application as part of various nanosensors. A nanodiamond sensor can be smaller than 50 nm in diameter and read-out optically without contact. As they are biocompatible and non cytotoxic, they can be used for many experiments in biological samples.
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.