Issue 22, 2019, Issue in Progress
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RSC Advances

Monitoring spin coherence of single nitrogen-vacancy centers in nanodiamonds during pH changes in aqueous buffer solutions†

Masazumi Fujiwara, ORCID logo *ab   Ryuta Tsukahara,b   Yoshihiko Sera,b   Hiroshi Yukawa,cde   Yoshinobu Baba,cdefg   Shinichi Shikatab  and  Hideki Hashimotob  

* Corresponding authors

a Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
E-mail: masazumi@sci.osaka-cu.ac.jp, masazumi@osaka-cu.ac.jp

b School of Science and Technology, Kwansei Gakuin University, Sanda, Hyogo 669-1337, Japan

c Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan

d Institute of Nano-Life-Systems, Institutes of Innovation for Future Society, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan

e Institute of Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, Anagawa 4-9-1, Inage-ku, Chiba, Japan

f Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Takamatsu 761-0395, Japan

g College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan, Republic of China

Abstract

We report on the sensing stability of quantum nanosensors in aqueous buffer solutions for the two detection schemes of quantum decoherence spectroscopy and nanoscale thermometry. The electron spin properties of single nitrogen-vacancy (NV) centers in 25 nm-sized nanodiamonds have been characterized by observing individual nanodiamonds during a continuous pH change from 4 to 11. We have determined the stability of the NV quantum sensors during the pH change as the fluctuations of ±12% and ±0.2 MHz for the spin coherence time (T2) and the resonance frequency (ω0) of their mean values, which are comparable to the instrument error of the measurement system. We discuss the importance of characterizing the sensing stability during the pH change and how the present observation affects the measurement scheme of nanodiamond-based NV quantum sensing.

Graphical abstract: Monitoring spin coherence of single nitrogen-vacancy centers in nanodiamonds during pH changes in aqueous buffer solutions

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Article information

DOI
https://doi.org/10.1039/C9RA02282A
Article type
Paper
Submitted
25 Mar 2019
Accepted
15 Apr 2019
First published
23 Apr 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 12606-12614

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Monitoring spin coherence of single nitrogen-vacancy centers in nanodiamonds during pH changes in aqueous buffer solutions

M. Fujiwara, R. Tsukahara, Y. Sera, H. Yukawa, Y. Baba, S. Shikata and H. Hashimoto, RSC Adv., 2019, 9, 12606 DOI: 10.1039/C9RA02282A

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