Quantum-grade nanodiamonds for ultrabright spin detection in live cells
arXiv:2312.17603 · doi:10.1021/acsnano.4c03424
Abstract
Optically accessible spin-active nanomaterials are promising as quantum nanosensors for probing biological samples. However, achieving bioimaging-level brightness and high-quality spin properties for these materials is challenging and hinders their application in quantum biosensing. Here, we demonstrate ultrabright fluorescent nanodiamonds (NDs) containing 0.6-1.3-ppm nitrogen-vacancy (NV) centers by spin-environment engineering via enriching spin-less 12C-carbon isotopes and reducing substitutional nitrogen spin impurities. The NDs, readily introduced into cultured cells, exhibited substantially narrow optically detected magnetic resonance (ODMR) spectra, requiring 16-times less microwave excitation power to give an ODMR depth comparable to that of conventional type-Ib NDs. They show average spin-relaxation times of T1 = 0.68 ms and T_2 = 1.6 us (1.6 ms and 2.7 us maximum) that were 5- and 11-fold longer than those of type-Ib, respectively. The bulk-like NV spin properties and bright fluorescence demonstrated in this study significantly improve the sensitivity of ND-based quantum sensors for biological applications.
References in corpus (8)
- Resolved sidebands in a strain-coupled hybrid spin-oscillator system
- Spin dynamics in the optical cycle of single nitrogen-vacancy centres in diamond
- Spectroscopy of Surface-Induced Noise Using Shallow Spins in Diamond
- Coherence of single spins coupled to a nuclear spin bath of varying density
- Simultaneous nanorheometry and nanothermometry using intracellular diamond quantum sensors
- Glass-patternable notch-shaped microwave architecture for on-chip spin detection in biological samples
- Engineering Spin Coherence in Core-Shell Diamond Nanocrystals
- Temperature dependence of charge conversion during NV-center relaxometry