Long Spin Relaxation Times in CVD-Grown Nanodiamonds

0576914 - ÚOCHB 2024 RIV US eng J - Journal Article
Prooth, J. - Petrov, M. - Shmakova, A. - Gulka, Michal - Cígler, Petr - D´Haen, J. - Boyen, H. G. - Nesladek, M.
Long Spin Relaxation Times in CVD-Grown Nanodiamonds.
Advanced Quantum Technologies. Roč. 6, č. 12 (2023), č. článku 2300004. E-ISSN 2511-9044
R&D Projects: GA MŠMT EF16_026/0008382; GA ČR(CZ) GA23-04876S
EU Projects: European Commission(XE) 101038045 - ChemiQS
Grant - others:AV ČR(CZ) StrategieAV21/29
Program: StrategieAV
Institutional support: RVO:61388963
Keywords : chemical vapor deposition * fluorescent nanodiamonds * nitrogen-vacancy (NV) spin relaxometry * quantum sensing
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4.4, year: 2022
Method of publishing: Open access
https://doi.org/10.1002/qute.202300004

Currently, the primary applications of fluorescent nanodiamonds (FNDs) are in the area of biosensing, by using photoluminescence or spin properties of color 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 (T1) and spin transversal (T2) relaxation and coherence times, respectively. This paper reports on utilizing 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 (Formula presented.) 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. The scalability issues are discussed in order to enable the production of FND volumes matching the needs of sensing applications.
Permanent Link: https://hdl.handle.net/11104/0346299