TiS2 Driven TiO2 Nano-Flakes: Ultrasonic Spray-Deposited ELlectrodes for Sensing And Electrochromic Applications

Date

2025-8

Author

Çevik, Eda

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

762
views

0
downloads

Cite This

Two-dimensional titanium disulfide (TiS2) driven titanium dioxide (TiO2) nanoflakes exhibit unique electrochemical properties compared to bulk TiO2. Exfoliated 2D titanium disulfide (TiS₂) was employed as a sacrificial template in a hydrothermal conversion process, yielding single-phase anatase TiO₂ flakes that retained the original morphology. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) confirmed the structural transformation and flake-like geometry, while Raman and XRD analyses revealed high crystallinity. The ultrathin architecture imparts excellent chemical stability, a large surface-to-volume ratio, and enhanced surface reactivity, enabling efficient electron transfer and catalytic activity. As a non-enzymatic hydrogen peroxide (H2O2) sensor, 2D TiO2 demonstrated high sensitivity, selectivity, and rapid response, attributed to abundant active sites and efficient charge transport. Integration with a conductive silver nanowire (Ag NW) network on flexible polyethylene terephthalate (PET) substrates via ultrasonic spray deposition further enhanced electrocatalytic H2O2 reduction. The hybrid electrodes demonstrated a linear response in the micromolar range, a low detection limit of 18.32 μM, and excellent stability (85 % retention after 60 days) with strong repeatability, indicating suitability for real-time health monitoring. Electrochromic performance was evaluated for 2D TiO2 films on indium tin oxide (ITO) coated glass substrates, showing 80 % optical transparency, high stability, and a coloration efficiency of 42 %. The combination of large surface area, abundant active sites, and optical clarity makes 2D TiO2 a promising electrochromic material. In summary, hydrothermally synthesized 2D TiO2 nanoflakes combined structural integrity, multifunctionality, and scalability, making them strong candidates for next generation sensing and electrochromic applications.

Subject Keywords

TiO2 Nano-flakes, 2D Materials, Ultrasonic Spray Coating, Hydrogen Peroxide Sensor, Electrochromic Device

URI

https://hdl.handle.net/11511/115634

Collections

Graduate School of Natural and Applied Sciences, Thesis