Department of Physics, School of Advanced Sciences, VIT University, Vellore, 632014, Tamil Nadu, India.
Department of Physics, VIT-AP University, Amaravati, Guntur, 522501, Andhra Pradesh, India.
Chemosphere. 2021 Jul;275:129960. doi: 10.1016/j.chemosphere.2021.129960. Epub 2021 Feb 11.
The present work reports the preparation of polyvinyl formal (PVF)/Titanium dioxide (TiO) nanocomposite films using a solution casting method followed by the characterization of the synthesized PVF/TiO nanocomposite films using various analytical techniques namely FTIR, XRD, UV-vis, SEM and TGA analysis. The results obtained from different analyses confirmed that the TiO NPs was fine dispersed within the PVF matrix and there exists well compatibility among the polymer matrix and the nanofiller. The pristine TiO NPs based fabricated chemiresistive sensor exhibits the maximum sensitivity of 50.25% at 370 °C where as PVF/TiO nanocomposite sensor showed the enhanced sensitivity of 83.75% at a relatively low operating temperature of 150 °C towards 600 ppm sulfur dioxide (SO) gas. The 25 wt% PVF/TiO nanocomposite film sensor exhibited good sensitivity (∼83.75%), selectivity, rapid response time (66 s)/recovery time (107 s), and long-term stability of 60 days for SO gas detection. The fabricated PVF/TiO nanocomposite film sensors in our work possesses the advantages of low power consumption, cost-effective, and distinguished sensing abilities for SO detection makes it possible for potential applications. Thus, the fabricated chemiresistive sensors based on TiO NPs reinforced PVF nanocomposites films are evaluated and experimental results to show an excellent behavior towards SO gas detection for industrial processes control and environmental monitoring applications.
本工作采用溶液浇铸法制备了聚乙烯醇缩甲醛（PVF）/二氧化钛（TiO）纳米复合材料薄膜，并采用傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、紫外可见光谱（UV-vis）、扫描电子显微镜（SEM）和热重分析（TGA）等多种分析技术对合成的 PVF/TiO 纳米复合材料薄膜进行了表征。不同分析结果证实，TiO NPs 纳米粒子在 PVF 基体中得到了良好的分散，聚合物基体与纳米填料之间存在良好的相容性。基于原始 TiO NPs 制备的化学电阻传感器在 370°C 时表现出最大灵敏度 50.25%，而 PVF/TiO 纳米复合材料传感器在相对较低的工作温度 150°C 下对 600 ppm 二氧化硫（SO）气体表现出增强的灵敏度 83.75%。25wt%PVF/TiO 纳米复合材料薄膜传感器对 SO 气体检测具有良好的灵敏度（约 83.75%）、选择性、快速响应时间（66 s）/恢复时间（107 s）和 60 天的长期稳定性。在我们的工作中，制备的 PVF/TiO 纳米复合材料薄膜传感器具有低功耗、成本效益高和出色的 SO 气体检测传感能力等优点，这使其在潜在应用中成为可能。因此，基于 TiO NPs 增强的 PVF 纳米复合材料薄膜制备的化学电阻传感器在工业过程控制和环境监测应用中对 SO 气体检测表现出优异的性能。
