Akademik Veri Yönetim Sistemi
Ceramics International, cilt.51, sa.13, ss.18305-18314, 2025 (SCI-Expanded, Scopus)
In this study, the gas sensing properties of pure and yttrium (Y)-doped ZnO nanoflower-structured sensors synthesized on Si substrates via the hydrothermal method were investigated for ammonia (NH₃) detection. ZnO, known for its high electron mobility, thermal stability, and wide bandgap, serves as an ideal candidate for gas sensing. Doping ZnO with Y aims to enhance its sensitivity and selectivity towards NH₃. The structural, morphological, and gas sensing properties of the synthesized sensors were analyzed using various techniques, including XRD, Raman spectroscopy, and FE-SEM. Gas sensing experiments conducted at room temperature revealed that the undoped ZnO sensor exhibited a sensing response of 5 %–50 ppm NH₃ gas, while the 3 % Y-doped ZnO (N3) sensor showed a significantly higher sensing response of 25 %. The combined effect of Si substrate utilization and Y doping enhanced the NH₃ sensing response. Additionally, dynamic measurements at varying gas concentrations revealed that the N3 sensor detected sensing responses of 3 % and 40 % for 5 ppm and 100 ppm NH₃ gas concentrations, respectively. The sensor demonstrated high selectivity towards ammonia gas at room temperature and maintained approximately 80 % of their stability after 90 days, showing acceptable repeatability and reusability, making it more suitable for practical applications. These findings underscore the potential of Y-doped ZnO nanoflowers in developing efficient and cost-effective gas sensors for environmental monitoring.