Semiconductor metal oxide materials have attracted great interest in gas sensors due to their high sensitivity to many target gases. In this study, an oxygen-sensitive optical chemical sensor was prepared in thin-film form by immobilizing meso-tetraphenylporphyrin (H2TPP) in silicon matrix in the presence of ZnO, CuO and ZnO/CuO hybrid nanoparticles as additives. Characterization of synthesized metal oxide powders was performed using XPS, XRD, SEM, and PL spectroscopy. Emission and decay time measurements of H2TPP-based materials were investigated between the concentration range of 0% and 100% [O2] in thin-film forms. The intensity-based signal drops of the additive-free form of porphyrin dye toward oxygen were calculated as 70%. Whereas, the oxygen sensitivities of H2TPP-based sensor slides were measured as 80%, 75%, and 88% in the presence of ZnO, CuO, and ZnO/CuO hybrid particles, respectively. The usage of porphyrin dye with ZnO/CuO hybrid additive provided higher oxygen sensitivity, larger linear response range, higher Stern-Volmer constant (KSV) value and faster response time compared to the undoped form, ZnO and CuO additive-doped forms of H2TPP. The response and the recovery times of the porphyrin-based sensing slide along with ZnO/CuO hybrid particles have been measured as 10 and 20 s. These results make the H2TPP along with the metal oxide additives promising candidates as oxygen probes.
Photoluminescence oxygen sensor H2TPP ZnO CuO ZnO/CuO hybrid.
Dokuz Eylul University Scientific Research Funds
2018.KB.FEN.039
XRD, XPS, and PL measurements were performed in the Center for Fabrication and Applications of Electronic Materials (EMUM)
2018.KB.FEN.039
Primary Language | English |
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Subjects | Analytical Chemistry |
Journal Section | Articles |
Authors | |
Project Number | 2018.KB.FEN.039 |
Publication Date | May 31, 2022 |
Submission Date | December 2, 2021 |
Acceptance Date | March 10, 2022 |
Published in Issue | Year 2022 Volume: 9 Issue: 2 |