Alaya Yassine, Madani Malek, Bouguila Noureddine, El Mir Lassaad, Fazio Enza, Corsaro Carmelo, Neri Giovanni
Laboratory of Physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE), Faculty of Sciences in Gabes, Gabes University, Gabes 6072, Tunisia.
Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, Viale F. Stagno D'Alcontres 31, 98166 Messina, Italy.
Materials (Basel). 2024 Jul 3;17(13):3283. doi: 10.3390/ma17133283.
High-performance hydrogen sulfide (HS) sensors are mandatory for many industrial applications. However, the development of HS sensors still remains a challenge for researchers. In this work, we report the study of a TiO-based conductometric sensor for HS monitoring at low concentrations. TiO samples were first synthesized using the sol-gel route, annealed at different temperatures (400 and 600 °C), and thoroughly characterized to evaluate their morphological and microstructural properties. Scanning electronic microscopy, Raman scattering, X-ray diffraction, and FTIR spectroscopy have demonstrated the formation of clusters of pure anatase in the TiO phase. Increasing the calcination temperature to 600 °C enhanced TiO crystallinity and particle size (from 11 nm to 51 nm), accompanied by the transition to the rutile phase and a slight decrease in band gap (3.31 eV for 400 °C to 3.26 eV for 600 °C). Sensing tests demonstrate that TiO annealed at 400 °C displays good performances (sensor response Ra/Rg of ~3.3 at 2.5 ppm and fast response/recovery of 8 and 23 s, respectively) for the detection of HS at low concentrations in air.
高性能硫化氢（HS）传感器对许多工业应用来说是必不可少的。然而，HS传感器的开发对研究人员而言仍然是一项挑战。在这项工作中，我们报告了一种用于低浓度HS监测的基于TiO的电导传感器的研究。首先采用溶胶-凝胶法合成TiO样品，在不同温度（400和600°C）下退火，并对其进行全面表征以评估其形态和微观结构特性。扫描电子显微镜、拉曼散射、X射线衍射和傅里叶变换红外光谱表明在TiO相中形成了纯锐钛矿簇。将煅烧温度提高到600°C可提高TiO的结晶度和粒径（从11 nm增加到51 nm），同时伴随着向金红石相的转变以及带隙略有减小（400°C时为3.31 eV，600°C时为3.26 eV）。传感测试表明，在400°C退火的TiO对空气中低浓度HS的检测具有良好的性能（在2.5 ppm时传感器响应Ra/Rg约为3.3，响应和恢复速度分别为8秒和23秒）。
