期刊
ACS NANO
卷 3, 期 7, 页码 1959-1965出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn9003617
关键词
fluorescent nanoparticle; defects in diamond; single molecule spectroscopy; confocal fluorescence microscopy; fluorescence lifetime imaging; electron spin resonance; single spin manipulation
类别
资金
- European Commission [LSHB-2005-CT-019102]
- Volkswagenstiftung
- NIH [1R01GM084712-01]
- CFDA [93.859]
This article reports stable photoluminescence and high-contrast optically detected electron spin resonance (ODESR) from single nitrogen-vacancy (NV) defect centers created within ultrasmall, disperse nanodiamonds of radius less than 4 nm, Unexpectedly, the efficiency for the production of NV fluorescent defects by electron irradiation is found to be independent of the size of the nanocrystals. Fluorescence lifetime imaging shows lifetimes with a mean value of around 17 ns, only slightly longer than the bulk value of the defects. After proper surface cleaning, the dephasing times of the electron spin resonance in the nanocrystals approach values of some microseconds, which is typical for the type 1b diamond from which the nanoparticle is made. We conclude that despite the tiny size of these nanodiamonds the photoactive nitrogen-vacancy color centers retain their bulk properties to the benefit of numerous exciting potential applications in photonics, biomedical labeling, and imaging.
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