Hybrid nanodiamond quantum sensors enabled by volume phase transitions of hydrogels

Ting Zhang, Gang-Qin Liu, Weng-Hang Leong, Chu-Feng Liu, Man-Hin Kwok, To Ngai, Ren-Bao Liu () and Quan Li ()
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Ting Zhang: The Chinese University of Hong Kong
Gang-Qin Liu: The Chinese University of Hong Kong
Weng-Hang Leong: The Chinese University of Hong Kong
Chu-Feng Liu: The Chinese University of Hong Kong
Man-Hin Kwok: The Chinese University of Hong Kong
To Ngai: The Chinese University of Hong Kong
Ren-Bao Liu: The Chinese University of Hong Kong
Quan Li: The Chinese University of Hong Kong

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Diamond nitrogen-vacancy (NV) center-based magnetometry provides a unique opportunity for quantum bio-sensing. However, NV centers are not sensitive to parameters such as temperature and pressure, and immune to many biochemical parameters such as pH and non-magnetic biomolecules. Here, we propose a scheme that can potentially enable the measurement of various biochemical parameters using diamond quantum sensing, by employing stimulus-responsive hydrogels as a spacing transducer in-between a nanodiamond (ND, with NV centers) and magnetic nanoparticles (MNPs). The volume phase transition of hydrogel upon stimulation leads to sharp variation in the separation distance between the MNPs and the ND. This in turn changes the magnetic field that the NV centers can detect sensitively. We construct a temperature sensor under this hybrid scheme and show the proof-of-the-principle demonstration of reversible temperature sensing. Applications in the detection of other bio-relevant parameters are envisioned if appropriate types of hydrogels can be engineered.

Date: 2018
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DOI: 10.1038/s41467-018-05673-9

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