Optical and electronic spin properties of fluorescent micro- and nanodiamonds upon prolonged ultrahigh-temperature annealing.

IF 1.5 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Nicholas Nunn, Sergey Milikisiyants, Marco D Torelli, Richard Monge, Tom Delord, Alexander I Shames, Carlos A Meriles, Ashok Ajoy, Alex I Smirnov, Olga A Shenderova
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引用次数: 0

Abstract

High-temperature annealing is a promising but still mainly unexplored method for enhancing spin properties of negatively charged nitrogen-vacancy (NV) centers in diamond particles. After high-energy irradiation, the formation of NV centers in diamond particles is typically accomplished via annealing at temperatures in the range of 800-900 °C for 1-2 h to promote vacancy diffusion. Here, we investigate the effects of conventional annealing (900 °C for 2 h) against annealing at a much higher temperature of 1600 °C for the same annealing duration for particles ranging in size from 100 nm to 15 μm using electron paramagnetic resonance and optical characterization. At this high temperature, the vacancy-assisted diffusion of nitrogen can occur. Previously, the annealing of diamond particles at this temperature was performed over short time scales because of concerns of particle graphitization. Our results demonstrate that particles that survive this prolonged 1600 °C annealing show increased NV T1 and T2 electron spin relaxation times in 1 and 15 μm particles, due to the removal of fast relaxing spins. Additionally, this high-temperature annealing also boosts magnetically induced fluorescence contrast of NV centers for particle sizes ranging from 100 nm to 15 μm. At the same time, the content of NV centers is decreased fewfold and reaches a level of <0.5 ppm. The results provide guidance for future studies and the optimization of high-temperature annealing of fluorescent diamond particles for applications relying on the spin properties of NV centers in the host crystals.

荧光微金刚石和纳米金刚石在长时间超高温退火下的光学和电子自旋特性。
高温退火是一种很有前途但主要尚未探索的方法,可以增强金刚石颗粒中带负电荷的氮空位(NV)中心的自旋性质。在高能辐照之后,通常通过在800-900的温度范围内退火来在金刚石颗粒中形成NV中心 1-2°C h以促进空位扩散。在这里,我们研究了传统退火(900 2°C h) 反对在1600的高温下退火 对于尺寸从100到100的颗粒,在相同的退火持续时间内为°C nm至15 μm。在这种高温下,可以发生空位辅助的氮扩散。以前,由于担心颗粒石墨化,金刚石颗粒在该温度下的退火是在短时间尺度上进行的。我们的研究结果表明,在这种延长的1600 °C退火显示在1和15中NV T1和T2电子自旋弛豫时间增加 μm粒子,由于去除了快速弛豫自旋。此外,这种高温退火还提高了NV中心的磁感应荧光对比度,颗粒尺寸从100 nm至15 μm。同时,NV中心的内容减少了几倍,达到了
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来源期刊
CiteScore
2.70
自引率
0.00%
发文量
146
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