Tunable optoelectronic performance of ZnO-Coated TiO2 nanowires for enhanced UV photodetection

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dc.authorid0000-0002-7361-2302
dc.authorid0000-0002-0760-5569
dc.authorid0000-0002-7383-2479
dc.contributor.authorSarac, M. F.
dc.contributor.authorSolakyildirim, T.
dc.contributor.authorTeber, A.
dc.date.accessioned2026-02-28T12:18:01Z
dc.date.available2026-02-28T12:18:01Z
dc.date.issued2025
dc.departmentBayburt Üniversitesi
dc.description.abstractIn this study, vertically aligned TiO2 nanowires (NWs) were fabricated on titanium (Ti) foil via thermal oxidation and subsequently coated with zinc oxide (ZnO) using zinc acetate solutions of 25, 50, and 100 mM concentrations. Structural and optoelectronic properties were systematically investigated using SEM, XRD, XPS, PL, UV-Vis, and I-V analyses. SEM results confirmed a progressive ZnO surface coverage, with complete encapsulation observed at 100 mM. EDS analysis revealed a Zn content increase from 0.81 wt.% (25 mM) to 8.43 wt.% (100 mM), accompanied by a decrease in Ti content from 70.78 wt.% to 49.02 wt.%. XRD patterns showed distinct ZnO peaks for coated samples, while XPS confirmed Zn2+ and Ti4+ states with minimal interdiffusion. Optical bandgap values increased slightly with ZnO concentration: 3.04 eV (pure TiO2), 3.06 eV (25 mM), 3.05 eV (50 mM), and 3.11 eV (100 mM), attributed to enhanced crystallinity and heterojunction formation. PL spectra showed increasing green luminescence ( similar to 520 nm) with ZnO content, indicating rising defect-related recombination. Electrical measurements showed a sharp rise in photocurrent from 3.67 x 10(-6) A (pure TiO2) to 4.74 x 10(-4) A (100 mM). Correspondingly, responsivity (R) increased from 0.020 to 2.168 mA/W and detectivity (D*) from 8.5 x 108 to 7.56 x 10(9) Jones. These results demonstrate that ZnO coating substantially enhances light absorption, charge separation, and carrier transport properties of TiO2 NWs. The optimized 100 mM ZnO-TiO2 heterostructure offers high-performance UV photodetection potential for environmental sensing, wearable optoelectronics, and aerospace technologies.
dc.identifier.doi10.1142/S1793604725510646
dc.identifier.issn1793-6047
dc.identifier.issn1793-7213
dc.identifier.issue6
dc.identifier.scopus2-s2.0-105016151496
dc.identifier.scopusqualityQ3
dc.identifier.urihttps://doi.org/10.1142/S1793604725510646
dc.identifier.urihttps://hdl.handle.net/20.500.12403/6079
dc.identifier.volume18
dc.identifier.wosWOS:001572011700001
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWorld Scientific Publ Co Pte Ltd
dc.relation.ispartofFunctional Materials Letters
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20260218
dc.subjectUV photodetectors
dc.subjectTiO2 nanowires
dc.subjectZnO coating
dc.subjectheterojunction structures
dc.subjectoptoelectronic properties
dc.titleTunable optoelectronic performance of ZnO-Coated TiO2 nanowires for enhanced UV photodetection
dc.typeArticle

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