In situ electron paramagnetic resonance spectroscopy using single nanodiamond sensors

Zhuoyang Qin, Zhecheng Wang, Fei Kong (), Jia Su, Zhehua Huang, Pengju Zhao, Sanyou Chen, Qi Zhang, Fazhan Shi () and Jiangfeng Du ()
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Zhuoyang Qin: University of Science and Technology of China
Zhecheng Wang: University of Science and Technology of China
Fei Kong: University of Science and Technology of China
Jia Su: University of Science and Technology of China
Zhehua Huang: University of Science and Technology of China
Pengju Zhao: University of Science and Technology of China
Sanyou Chen: University of Science and Technology of China
Qi Zhang: University of Science and Technology of China
Fazhan Shi: University of Science and Technology of China
Jiangfeng Du: University of Science and Technology of China

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract An ultimate goal of electron paramagnetic resonance (EPR) spectroscopy is to analyze molecular dynamics in place where it occurs, such as in a living cell. The nanodiamond (ND) hosting nitrogen-vacancy (NV) centers will be a promising EPR sensor to achieve this goal. However, ND-based EPR spectroscopy remains elusive, due to the challenge of controlling NV centers without well-defined orientations inside a flexible ND. Here, we show a generalized zero-field EPR technique with spectra robust to the sensor’s orientation. The key is applying an amplitude modulation on the control field, which generates a series of equidistant Floquet states with energy splitting being the orientation-independent modulation frequency. We acquire the zero-field EPR spectrum of vanadyl ions in aqueous glycerol solution with embedded single NDs, paving the way towards in vivo EPR.

Date: 2023
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DOI: 10.1038/s41467-023-41903-5

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