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Abstract
Since the discovery of laser-induced graphite/graphene, there has been a notable surge of scientific interest in advancing diverse methodologies for their synthesis and applications. This study focuses on the utilization of a pulsed Nd:YAG laser to achieve graphitization of polydopamine (PDA) deposited on the surface of titania nanotubes. The partial graphitization is corroborated through Raman and XPS spectroscopies and supported by water contact angle, nanomechanical, and electrochemical measurements. Reactive molecular dynamics simulations confirm the possibility of graphitization in the nanosecond time scale with the evolution of NH3, H2O, and CO2 gases. A thorough exploration of the lasing parameter space (wavelength, pulse energy, and number of pulses) was conducted with the aim of improving either electrochemical activity or photocurrent generation. Whereas the 532 nm laser pulses interacted mostly with the PDA coating, the 365 nm pulses were absorbed by both PDA and the substrate nanotubes, leading to a higher graphitization degree. The majority of the photocurrent and quantum efficiency enhancement is observed in the visible light between 400 and 550 nm. The proposed composite is applied as a photoelectrochemical (PEC) sensor of serotonin in nanomolar concentrations. Because of the suppressed recombination and facilitated charge transfer caused by the laser graphitization, the proposed composite exhibits significantly enhanced PEC performance. In the sensing application, it showed superior sensitivity and a limit of detection competitive with nonprecious metal materials
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Authors (6)
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Krzysztof Polaczek mgr
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Katarzyna Siuzdak dr hab. inż.
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1021/acsami.3c11580
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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ACS Applied Materials & Interfaces
no. 15,
pages 59921 - 52938,
ISSN: 1944-8244 - Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Olejnik A., Polaczek K., Szkodo M., Stanisławska A., Ryl J., Siuzdak K.: Laser-Induced Graphitization of Polydopamine on Titania Nanotubes// ACS Applied Materials & Interfaces -Vol. 15,iss. 45 (2023), s.59921-52938
- DOI:
- Digital Object Identifier (open in new tab) 10.1021/acsami.3c11580
- Sources of funding:
-
- Projekt NCN Preludium: 2022/45/N/ST5/00192 Realizowany w jednostce IMP PAN
- Verified by:
- Gdańsk University of Technology
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