Nanodiamond surface as a photoluminescent pH sensor

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Abstract

A systematic spectroscopic characterization of highly homogeneous water suspensions of ‘buckydiamonds’ comprising sp3 cubic nanodiamond (ND) core covered with disordered sp2 shell densely decorated with oxygen-containing groups demonstrates the excitation-wavelength-dependent photoluminescence (PL) given by at least four types of specific structures on the ND surface (hydroxyl, C=O containing ketones, carboxylic anhydrides, and carboxyl groups). PL properties of NDs suspensions possess concentration-dependent behavior revealing tendency of NDs to agglomerate. PL of NDs has been found to be strongly sensitive to pH of the environment in wide range of pH values, i.e. 2-11. We disclosed the mechanisms of pH sensitivity of the ‘buckydiamond’ and proved that it can serve as all-optical sensor of tiny pH variations suitable for further exploitation for pH sensing locally in the area where NDs have been delivered for any purpose, e.g. bioimaging or therapeutic needs.

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APA

Padrez, Y., Golubewa, L., Bahdanava, A., Jankunec, M., Matulaitiene, I., Semenov, D., … Kuzhir, P. (2023). Nanodiamond surface as a photoluminescent pH sensor. Nanotechnology, 34(19). https://doi.org/10.1088/1361-6528/acb94b

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