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Updated: Sep 24, 2025

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
Published on: January 6, 2016
Monitoring spin coherence of single nitrogen-vacancy centers in nanodiamonds during pH changes in aqueous buffer
Masazumi Fujiwara1,2, Ryuta Tsukahara2, Yoshihiko Sera2
1Department of Chemistry, Graduate School of Science, Osaka City University Sumiyoshi-ku Osaka 558-8585 Japan masazumi@sci.osaka-cu.ac.jp masazumi@osaka-cu.ac.jp.
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 (T 2) and the resonance frequency (ω 0) 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.
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