Journal
NANO LETTERS
Volume 13, Issue 7, Pages 3305-3309Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl4015233
Keywords
Nanodiamonds; biomolecules; ferritin; nitrogen-vacancy centers; optically detected magnetic resonance
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Funding
- DFG [SPP1601, SFB TR21]
- EU (DIAMANT)
- DARPA (QUASAR)
- Alexander von Humboldt Foundation
- Marie-Curie fellowship
- FP7
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Nanometer-sized diamonds containing nitrogen-vacancy defect centers (NV) are promising nanosensors in biological environments due to their biocompatibility, bright fluorescence, and high magnetic sensitivity at ambient conditions. Here we report on the detection of ferritin molecules using magnetic noise induced by the inner paramagnetic iron as a contrast mechanism. We observe a significant reduction of both coherence and relaxation time due to the presence of ferritin on the surface of nanodiamonds. Our theoretical model is in excellent agreement with the experimental data and establishes this method as a novel sensing technology for proteins.
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