Dr. Pawel Niedzialkowski Profile

Dr. Pawel Niedzialkowski

at Univ Gdansk

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Publications (4)

Proceedings Article | 23 May 2023 Paper

Does the refractive index sensitivity matter the most? Charge of biological material and performance of label-free biosensors

Monika Janik, Paweł Niedziałkowski, Katarzyna Lechowicz, Marcin Koba, Petr Sezemsky, Vitezslav Stranak, Mateusz Śmietana

Proceedings Volume 12643, 1264315 (2023) https://doi.org/10.1117/12.2678085

KEYWORDS: Sensors, Biosensing, Electrodes, Biosensors, Refractive index, Optical properties, Proteins, Biomedical optics

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Proceedings Article | 18 April 2021 Presentation

Effect of pH on optical sensing with poly-L-lysine-modified nanodiamonds

Maciej Glowacki, Monika Janik, Mirosław Sawczak, Anna Wcislo, Pawel Niedzialkowski, Mateusz Ficek, Robert Bogdanowicz

Proceedings Volume 11772, 117720D (2021) https://doi.org/10.1117/12.2589306

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Nitrogen-vacancy (NV) centers are crystallographic defects which provide diamonds with unique physical properties. The centers are known for their intensive, time-stable fluorescence, and an electron spin, which exhibits long coherence time and may be manipulated using external stimuli. Nanodiamonds containing the NV centers are promising tools in biolabeling, biosensing, and drug delivery due to the aforementioned properties of the defects combined with a chemical inertness of a core and an easily functionalized surface of the diamond. Many biochemical reactions are pH-sensitive, therefore, in order to utilize the NV centers for monitoring of such processes, the pH-dependency of the properties of the nanodiamonds needs to be well-understood. Functionalization of the nanodiamonds’ surfaces with biological molecules undergoing pH-triggered changes of conformation, e.g. poly-L-lysine, could not only increase the particles’ biocompatibility and promote cell adhesion, but also possibly enhance pH-sensitivity. In the present study, an impact of pH on the fluorescence, a zeta potential, and a contact angle of the NV centers-containing nanodiamonds dispersed in liquid media is examined. The suspensions were made of commercially available, fluorescent diamond particles in an as-received, unmodified state, and after the poly-L-lysine had been attached to their surfaces via two different procedures – in aqueous, and anhydrous environment. Values of pH of dispersion media were specifically chosen to induce diverse conformation of the poly-L-lysine: from a fully relaxed conformation, through a state of being neither wholly extended, nor helical, to a complete α-helix conformation. The intensity of the photoluminescence emitted by the NV centers has been found to depend on the pH-triggered conformation of the poly-L-lysine attached to the surfaces of the nanodiamonds. The impact of the conformation of the poly-L-lysine on the electric charge of the nanoparticles has also been analyzed. This study confirms the potential of the nitrogen-vacancy centers for optical sensing of pH-triggered processes.

Proceedings Article | 28 August 2019 Paper

Optical fiber lossy-mode resonance sensors with doped tin oxides for optical working electrode monitoring in electrochemical systems

Dariusz Burnat, Marta Janczuk-Richter, Paweł Niedziałkowski, Wioleta Białobrzeska, Petr Sezemsky, Marcin Koba, Vitezslav Stranak, Robert Bogdanowicz, Tadeusz Ossowski, Joanna Niedziółka-Jönsson, Mateusz Śmietana

Proceedings Volume 11199, 111991O (2019) https://doi.org/10.1117/12.2541354

KEYWORDS: Sensors, Transparent conductors, Electrodes, Oxides, Thin films, Refractive index, Optical fibers, Fiber optics sensors

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Proceedings Article | 22 December 2016 Paper

Annealing of indium tin oxide (ITO) coated optical fibers for optical and electrochemical sensing purposes

Magdalena Dominik, Katarzyna Siuzdak, Paweł Niedziałkowski, Vitezslav Stranak, Petr Sezemsky, Michał Sobaszek, Robert Bogdanowicz, Tadeusz Ossowski, Mateusz Śmietana

Proceedings Volume 10175, 1017515 (2016) https://doi.org/10.1117/12.2263289

KEYWORDS: Annealing, Indium, Tin, Oxides, Optical fibers, Fiber optics sensors, Optical properties, Coating, Glasses, Electrodes

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