How to Identify, Attribute, and Quantify Triplet Defects in Ensembles of Small Nanoparticles.
How to Identify, Attribute, and Quantify Triplet Defects in Ensembles of Small Nanoparticles.
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如何识别、归因和量化小纳米粒子集合中的三重态缺陷。
DOI：
10.1021/acs.jpclett.0c01922
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
A. Shames
中科院分区：
文献类型：
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作者：
T. Segawa;A. Shames
含负电荷三重态(电子自旋S=1)氮空位(NV-)中心的纳米金刚石是一种特殊的室温量子系统，其电子自旋即使在单个纳米晶体中也可以被极化并被光学读出。在这份报告中，我们提出了一种简单但可靠的方法，利用电子顺磁共振(EPR)光谱来识别、表征和定量多晶样品中的这些三重态缺陷。这种特征依赖于一种特殊的“被禁止的”转变(“ΔMS=2”)，它出现在大约中心磁场的一半处，并且表现出非常小的各向异性。特别是，我们强调，这种方法到目前为止并不局限于钻石中的NV中心，而是可以成为表征各种类型纳米颗粒中新型三重态缺陷的重要工具。
Nanodiamonds containing negatively-charged triplet (having an electron spin S = 1) Nitrogen-Vacancy (NV-) centers are an extraordinary room temperature quantum system, whose electron spins may be polarized and read out optically even in a single nanocrystal. In this report, we promote a simple but reliable method to identify, attribute and quantify these triplet defects in a polycrystalline sample using Electron Paramagnetic Resonance (EPR) spectroscopy. The characterization relies on a specific "forbidden" transition ("ΔMS = 2"), which appears at about half the central magnetic field and shows a remarkably small anisotropy. In particular, we emphasize that this method is by far not limited to NV- centers in diamond, but could become an important characterization tool for novel triplet defects in various types of nanoparticles.