Long Spin Relaxation Times in CVD-Grown Nanodiamonds
arXiv:2605.16394 · doi:10.1002/qute.202300004
Abstract
Currently, the primary applications of fluorescent nanodiamonds (FNDs) are in the area of biosensing, by using photoluminescence or spin properties of colour centres, mainly represented by the Nitrogen Vacancy (NV) point defect. The sensitivity of NV-FNDs to external fields is, however, limited by crystallographic defects, which influence their key quantum state characteristics - the spin longitudinal (\textit{T}) and spin transversal (\textit{T}) relaxation and coherence times, respectively. We report on utilising an advanced FND growth technique consisting of heterogeneous nucleation on pre-engineered sites to create FNDs averaging around 60 nm in size, with mean longitudinal coherence times of 800 s and a maximum over 1.8 ms, close to bulk theoretical values. This is a major, nearly ten-fold improvement over commercially available nanodiamonds for the same size range of 50 to 150 nm. Heavy-N doped nanodiamond shells, important for sensing events in nm proximity to the diamond surface, are fabricated and discussed in terms of re-nucleation and twinning on \{111\} crystal facets. We also discuss scalability issues in order to enable the production of FND volumes matching the needs of sensing applications.
References in corpus (14)
- Magnetometry with nitrogen-vacancy defects in diamond
- High Resolution Magnetic Resonance Spectroscopy Using Solid-State Spins
- Temperature and magnetic field dependent longitudinal spin relaxation in nitrogen-vacancy ensembles in diamond
- Photoelectrical detection of electron spin resonance of nitrogen-vacancy centres in diamond
- Production of oriented nitrogen-vacancy color centers in synthetic diamond
- Identifying and mitigating charge instabilities in shallow diamond nitrogen-vacancy centers
- Observing bulk diamond spin coherence in high-purity nanodiamonds
- Double-quantum spin-relaxation limits to coherence of near-surface nitrogen-vacancy centers
- Nanoscale Dynamic Readout of a Chemical Redox Process Using Radicals Coupled with Nitrogen-Vacancy Centers in Nanodiamonds
- The role of spin noise in the detection of nanoscale ensembles of nuclear spins
- Long Spin Coherence Times of Nitrogen Vacancy Centres in Milled Nanodiamonds
- Longitudinal spin-relaxation in nitrogen-vacancy centers in electron irradiated diamond
- Exploiting ionization dynamics in the nitrogen vacancy center for rapid, high-contrast spin and charge state initialization
- Temperature-dependence of T1 spin relaxation of single NV centers in nanodiamonds