Fabrication of Detonation Nanodiamonds Containing Silicon‐Vacancy Color Centers by High Temperature Annealing
Fabrication of Detonation Nanodiamonds Containing Silicon‐Vacancy Color Centers by High Temperature Annealing
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高温退火制备含硅空位色心的爆炸纳米金刚石
DOI：
10.1002/pssa.202100144
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Takeuchi Shigeki
中科院分区：
文献类型：
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作者：
Shimazaki Konosuke;Kawaguchi Hiroki;Takashima Hideaki;Segawa Takuya Fabian;So Frederick T.-K.;Terada Daiki;Onoda Shinobu;Ohshima Takeshi;Shirakawa Masahiro;Takeuchi Shigeki
爆轰纳米金刚石（DND）的尺寸小于10 nm的单光子发射器引起了人们的关注，从生命科学到量子技术的许多研究领域的潜力。然而，虽然在爆轰合成后直接在纳米金刚石中发现氮空位（NV）色心，而不需要照射或退火，但在这些原始样品中不存在硅空位（SiV）色心。在此，通过在高真空中高达1100 °C的退火处理在DND中产生SiV中心。由于没有添加硅，SiV中心的前体必须是纳米金刚石晶格内的原始硅杂质。在退火前进行电子辐照的DND中观察到波长为737 nm、线宽为7.7 nm的尖锐发射线。该波长与SiV中心的特征发射线一致，其线宽与通过化学气相沉积和随后的研磨产生的较大纳米金刚石的线宽相当。荧光的平均寿命（0.4 ± 0.04 ns）在纳米金刚石中报道的寿命范围内，也支持观察到的发射峰是由于DND中的SiV中心。
Detonation nanodiamonds (DNDs) with sizes below 10 nm have attracted attention as single photon emitters with potential in many research fields from life sciences to quantum technologies. However, while nitrogen‐vacancy (NV) color centers are found in nanodiamonds directly after the detonation synthesis without the need for irradiation or annealing, silicon‐vacancy (SiV) color centers are not present in these pristine samples. Herein, SiV centers are created in DNDs by an annealing treatment up to 1100 °C in high vacuum. As silicon is not added, the precursor of the SiV centers must be pristine silicon impurities inside the nanodiamond lattice. A sharp emission line at the wavelength of 737 nm with a linewidth of 7.7 nm is observed in DNDs that are electron irradiated before annealing. This wavelength is consistent with the characteristic emission line of SiV centers and its linewidth is comparable with that in larger nanodiamonds created by chemical vapor deposition and subsequent milling. The average lifetime (0.4 ± 0.04 ns) of the fluorescence, which is in the range of reported lifetimes in nanodiamonds, also support that the observed emission peak are due to SiV centers in DNDs.