Akademik Veri Yönetim Sistemi
Colloids and Surfaces A: Physicochemical and Engineering Aspects, cilt.743, 2026 (SCI-Expanded, Scopus)
Two-dimensional (2D) ZnO nanosheets were successfully synthesized via the successive ionic layer adsorption and reaction (SILAR) method and systematically investigated for CO2 gas sensing. Achieving a stable 2D ZnO morphology is challenging because ZnO typically favors one-dimensional c-axis growth. Through controlled ion adsorption and dehydration kinetics, the SILAR process promoted lateral growth, producing uniform ultrathin nanosheets with high crystallinity and large active surface area. Structural and optical analyses confirmed the formation of phase-pure wurtzite ZnO with nanosheet thickness in the nanometer range, while FTIR studies revealed the presence of hydroxyl surface groups acting as active adsorption sites. Electrical measurements demonstrated ohmic behavior with a moderate resistance (∼1.2 × 105 Ω at room temperature), consistent with the n-type nature of ZnO arising from oxygen vacancies and zinc interstitials. The 2D ZnO nanosheet sensor exhibited an enhanced CO2 response of ∼40% toward 500 ppm at 150 °C, with fast response (103 s) and recovery (86 s) times, outperforming several other ZnO morphologies reported in the literature. These findings highlight the SILAR technique as a simple, low-temperature, and scalable route to achieve controlled quasi-2D ZnO growth, providing a promising platform for next-generation, low-temperature metal oxide gas sensors.