材料科学
等离子体
曲面(拓扑)
热的
复合材料
化学工程
热力学
物理
数学
几何学
工程类
核物理学
作者
Michal Gulka,Priyadharshini Balasubramanian,Ekaterina Shagieva,Jakub Copak,Josef Khun,Vladimír Scholtz,Fedor Jelezko,Štěpán Stehlík,Petr Cígler
出处
期刊:Carbon
[Elsevier]
日期:2024-03-20
卷期号:224: 119062-119062
标识
DOI:10.1016/j.carbon.2024.119062
摘要
Sensitive local monitoring of intracellular processes by quantum sensing utilizing nitrogen-vacancy (NV) centers in nanodiamonds (NDs), would greatly advance cell biology and medicine. However, NDs still fall behind in sensitivity compared to bulk diamond because of their much shorter NV relaxation times. As suggested in theoretical studies, prolongation of NV relaxation times should be achievable by surface optimization creating mixed H/O surface termination consisting of hydrogen atoms, hydroxyl groups, and C–O–C ether bridges. Here we target such chemistry by employing a non-thermal plasma (NTP) in a point-to-plain discharge configuration in aqueous solution. We have devised a set of experiments with different types of nanodiamond samples (of HPHT or detonation origin and with an H- or O-terminated surface) and four working gases (air, O2, He, and H2). Using FTIR, we have found that NTP modification induces a relative increase of O–H and C–H bonds with respect to CO bonds. We have observed the biggest changes in FTIR spectra and the greatest decrease in zeta potential with oxidized NDs (both detonation and HPHT) and hydrogen as the working gas. NV electron spin relaxation times of thus modified HPHT NDs indicate an improvement of the T1 time by ∼17%–∼29% and the T2 time prolongation of 40%.
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