Fluorescent Hpht Nanodiamonds Have Disk-Like Shapes

Eldemrdash, Samir; Thalassinos, Giannis; Alzahrani, Amani; Sun, Qiang; Walsh, Ella; Grant, Erin S; Abe, Hiroshi; Greaves, Tamar L.; Ohshima, Takeshi; Cígler, Petr; Matějíček, Pavel; Simpson, David A.; Greentree, Andrew D.; Bryant, Gary; Gibson, Brant C.; Reineck, Philipp

doi:10.2139/ssrn.4181116

Cited by 1 publication

(1 citation statement)

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“…This is comparable to the dimensions of some of the diamonds investigated in [36] and far smaller than those studied in [40]. Although it was not possible to measure the height of ND4 using SEM, it is likely to be significantly less than the length of the long axis [58]. Unfortunately, due to a combination of surface contamination and nanodiamond agglomeration, it wasn't possible to locate any of the other four diamonds referenced in Figure 2.…”

Section: Resultsmentioning

confidence: 54%

Nanodiamonds with the Optimal Nitrogen Concentration for Quantum Sensing

March¹,

D²,

Stephen³

et al. 2023

Preprint

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The negatively charged nitrogen-vacancy centre (NV − ) in diamond has been utilized in a wide variety of sensing applications. The centre's long spin coherence and relaxation times (T * 2 , T 2 and T 1 ) at room temperature are crucial to this, as they often limit sensitivity. Using NV − centres in nanodiamonds allows for operations in environments inaccessible to bulk diamond, such as intracellular sensing. Finding NV − centres in diamonds smaller than 100 nm requires the use of fairly high nitrogen concentrations, while to achieve long spin coherence times, researchers have aimed for low nitrogen concentrations. Here we show that both aims can be achieved together by choosing to make the nanodiamonds from a starting material containing 1-10 ppm of nitrogen, a concentration range previously identified for NV − centre sensing with bulk diamond, but not yet tested for nanodiamonds. We report long spin coherence and relaxation times at room temperature for single NV − centres in isotopically-purified polycrystalline ball-milled nanodiamonds. Using a spin-locking pulse sequence, we observe spin coherence times, T 2 , up 786 ± 200 µs. We also measure T * 2 times up to 2.06 ± 0.24 µs and T 1 times up to 2.0 ± 0.4 ms. Producing the diamonds by ball-milling allows for the efficient production of large masses of nanodiamond.

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Section: Resultsmentioning

confidence: 54%