Poly-L-Lysine-functionalized fluorescent diamond particles: pH triggered fluorescence enhancement via surface charge modulation

Monika Janik; Maciej Jerzy Głowacki; Mirosław Sawczak; Anna Wcisło; Paweł Niedziałkowski; Kacper Jurak; Mateusz Ficek; Robert Bogdanowicz

doi:10.1557/s43577-022-00326-1

Poly-L-Lysine-functionalized fluorescent diamond particles: pH triggered fluorescence enhancement via surface charge modulation

Abstract

Recently, the interest in applying fluorescent diamond particles (FDPs) containing nitrogen-vacancy (NV) centers for enhancing the mechanical and chemical properties of some materials, biological imaging, and sensing has been expanding rapidly. The unique properties of NV centers such as intensive, time-stable fluorescence, and an electron spin, which exhibits long coherence time and may be manipulated using external stimuli, such as pH, make them a perfect candidate for a quantum-effect-based sensing platform. However, monitoring of the local changes with the use of the nonmodified diamond particles has certain limitations; therefore, to enhance their sensing properties, in this article, the covalent functionalization of the FDPs’ surfaces with poly-L-Lysine (pLys) (NV-pLys) is presented. The FDPs’ surface is functionalized in an anhydrous environment, and successful attachment is confirmed by Fourier transform infrared spectroscopy (FTIR). As the pLys undergoes pH-triggered changes of conformation, it also induces changes in the diamonds’ surface charge, therefore modulating the fluorescence, and finally as a result enhances NV-pLys pH-sensitivity. Further investigation of the zeta potential, particle size, and contact angle reveals remarkable colloidal stability and superior wettability of the NV-pLys over a wide range of pH, which also may significantly affect NV-pLys biocompatibility. These findings open new possibilities for the construction of biocompatible, stable, and highly sensitive nanosensors.

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Authors (8)

Monika Janik dr inż.
Maciej Jerzy Głowacki (formerly: Maciej Głowacki)
Mirosław Sawczak dr hab. inż.
- Instytut Maszyn Przepływowych Polskiej Akademii Nauk
Anna Wcisło dr
- Uniwersytet Gdański
Paweł Niedziałkowski Dr
- Uniwersytet Gdański
Kacper Jurak dr inż.
Mateusz Ficek dr inż.
Robert Bogdanowicz dr hab. inż.

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DOI:: Digital Object Identifier (open in new tab) 10.1557/s43577-022-00326-1
License: Copyright (2022 Materials Research Society)

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Articles

Type:

artykuły w czasopismach

Published in:

MRS BULLETIN no. 47, pages 1 - 12,
ISSN: 0883-7694

Language:

English

Publication year:

2022

Bibliographic description:

Janik M., Głowacki M., Sawczak M., Wcisło A., Niedziałkowski P., Jurak K., Ficek M., Bogdanowicz R.: Poly-L-Lysine-functionalized fluorescent diamond particles: pH triggered fluorescence enhancement via surface charge modulation// MRS BULLETIN -Vol. 47, (2022), s.1-12

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