Molecular-Scale Nanodiamond with High-Density Color Centers Fabricated from Graphite by Laser Shocking
Molecular-Scale Nanodiamond with High-Density Color Centers Fabricated from Graphite by Laser Shocking
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DOI：
10.1016/j.xcrp.2020.100054
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
Maithilee Motlag;Xingtao Liu;N. Nurmalasari;Shengyu Jin;Qiong Nian;Charles Park;Linrui Jin;Libai Huang;Jing Liu;G. Cheng
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文献类型：
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作者：
Maithilee Motlag;Xingtao Liu;N. Nurmalasari;Shengyu Jin;Qiong Nian;Charles Park;Linrui Jin;Libai Huang;Jing Liu;G. Cheng
具有氮空位色心的纳米金刚石由于其在室温下稳定的非经典光子发射而在量子信息科学和生物成像方面具有潜在的应用价值。具有足够色心的分子尺寸纳米金刚石的大规模制造可以经济地促进其在多学科领域的应用。在这里，报道了从石墨粉末制造分子大小的NV中心富集的纳米金刚石。我们使用超快激光冲击技术产生强烈的等离子体，将石墨转化为限制层下的纳米金刚石。分子动力学模拟结果表明，在35 GPa的高压和3, 000 K的高温下，石墨在100 ps内发生了向纳米金刚石的相变。在3.82 GW/cm 2的最佳激光能量下观察到高浓度的NV中心，在该点处，分子大小（约5 nm）的纳米金刚石可以单独容纳多达100个NV中心。超快激光冲击后的连续三聚氰胺退火使NV中心的数量增加了10倍以上，并使NV中心的自发衰变率提高了5倍。我们的工作可能会提高纳米金刚石应用的可行性，包括量子信息，电磁传感，生物成像和药物输送。
Nanodiamonds (NDs) with nitrogen vacancy (NV) color centers have the potential for quantum information science and bioimaging due to their stable and non-classical photon emission at room temperature. Large-scale fabrication of molecular-size nanodiamonds with sufficient color centers may economically promote their application in versatile multidisciplinary fields. Here, the manufacture of molecular-size NV center-enriched nanodiamonds from graphite powder is reported. We use an ultrafast laser shocking technique to generate intense plasma, which transforms graphite to nanodiamonds under the confinement layer. Molecular dynamics simulations suggest that the high pressure of 35 GPa and the high temperature of 3,000K result in the metaphase transition of graphite to nanodiamonds within 100 ps. A high concentration of NV centers is observed at the optimal laser energy of 3.82 GW/cm2, at which point molecular-size (∼5 nm) nanodiamonds can individually host as many as 100 NV centers. Consecutive melamine annealing following ultrafast laser shocking enriches the number of NV centers >10-fold and enhances the spontaneous decay rate of the NV center by up to 5 times. Our work may enhance the feasibility of nanodiamonds for applications, including quantum information, electromagnetic sensing, bioimaging, and drug delivery.