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pH Nanosensor Using Electronic Spins in Diamond.

Takahiro Fujisaku^1,2, Ryotaro Tanabe¹, Shinobu Onoda^2,3

¹Department of Molecular Engineering, Graduate School of Engineering , Kyoto University , Nishikyo-Ku, Kyoto 615-8510 , Japan.

|September 21, 2019

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This summary is machine-generated.

Researchers developed a novel nanoscale pH sensor using modified fluorescent nanodiamonds. This technology allows for precise measurement of local pH environments in biological systems, offering a new tool for nanomedicine research.

Area of Science:

Materials Science
Nanotechnology
Biophysics

Background:

Intracellular pH dynamics are crucial for biological processes.
Existing methods for nanoscale pH sensing are limited.
Fluorescent nanodiamonds (FNDs) with nitrogen-vacancy (NV) centers offer potential for nanoscale sensing.

Purpose of the Study:

To develop a general method for fabricating nanoscale pH sensors.
To tailor FND surface properties for pH sensing applications.
To demonstrate tunable pH sensitivity using modified FNDs.

Main Methods:

Coating FNDs with ionic chemical layers (carboxyl and polycysteine).
Measuring the longitudinal relaxation time (T1) of NV electron spins.
Correlating T1 changes with ambient pH in aqueous buffers and D2O.

Keywords:

color centers nanometer-scale sensing nanoparticles nitrogen-vacancy centers pH measurements

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Main Results:

Carboxylated FNDs showed pH sensitivity between pH 3 and 7.
Polycysteine-coated FNDs exhibited pH dependence between pH 7 and 11.
pH sensitivity was attributed to ion exchange, not magnetic noise.

Conclusions:

Surface modification of FNDs enables tunable nanoscale pH sensing.
This method provides a general approach for creating nanometer-sized pH meters.
The technology has potential for real-time monitoring of local pH in biological systems.