Ferlazzo Angelo, Neri Giovanni, Donato Andrea, Gugliandolo Giovanni, Latino Mariangela
Department of Chemical Sciences, University of Catania, 95125 Catania, Italy.
Department of Engineering, University of Messina, 98166 Messina, Italy.
Sensors (Basel). 2024 Dec 27;25(1):114. doi: 10.3390/s25010114.
Zinc oxide nanoparticles (ZnO NPs) with varying levels of nitrogen (N) doping were synthesized using a straightforward sol-gel approach. The morphology and microstructure of the N-doped ZnO NPs were examined through techniques such as SEM, XRD, photoluminescence, and Raman spectroscopy. The characterization revealed visible changes in the morphology and microstructure resulting from the incorporation of nitrogen into the ZnO lattice. These N-doped ZnO NPs were used in the fabrication of conductometric gas sensors designed to operate at room temperature (RT) for detecting low concentrations of NO in the air, under LED UV-Vis irradiation (λ = 400 nm). The influence of nitrogen doping on sensor performance was systematically studied. The findings indicate that N-doping effectively enhances ZnO-based sensors' ability to detect NO at RT, achieving a notable response (S = R/R) of approximately 18 when exposed to 5 ppm of NO. These improvements in gas-sensing capabilities are attributed to the reduction in particle size and the narrowing of the optical band gap.
采用简单的溶胶-凝胶法合成了具有不同氮（N）掺杂水平的氧化锌纳米颗粒（ZnO NPs）。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、光致发光和拉曼光谱等技术对氮掺杂的ZnO NPs的形貌和微观结构进行了研究。表征结果显示，由于氮掺入ZnO晶格，其形貌和微观结构发生了明显变化。这些氮掺杂的ZnO NPs被用于制造室温（RT）下工作的电导式气体传感器，用于在LED紫外-可见（UV-Vis）照射（λ = 400 nm）下检测空气中低浓度的NO。系统研究了氮掺杂对传感器性能的影响。研究结果表明，氮掺杂有效地提高了基于ZnO的传感器在室温下检测NO的能力，当暴露于5 ppm的NO时，实现了约18的显著响应（S = R/R）。气敏性能的这些改善归因于粒径的减小和光学带隙的变窄。
