Surface R&D Group, Korea Institute of Industrial Technology (KITECH), 156, Gaetbeol-ro, Yeonsu-gu, Incheon 21999, Korea.
Nanotechnology. 2017 Mar 3;28(9):095502. doi: 10.1088/1361-6528/aa5836. Epub 2017 Jan 10.
Surface-area-controlled porous TiO thin films were prepared via a simple sol-gel chemical route, and their gas-sensing properties were thoroughly investigated in the presence of typical oxidizing NO gas. The surface area of TiO thin films was controlled by developing porous TiO networked by means of controlling the TiO-to-TTIP (titanium isopropoxide, CHOTi) molar ratio, where TiO nanoparticles of size ∼20 nm were used. The sensor's response was found to depend on the surface area of the TiO thin films. The porous TiO thin-film sensor with greater surface area was more sensitive than those of TiO thin films with lesser surface area. The improved sensing ability was ascribed to the porous network formed within the thin films by TiO sol. Our results show that surface area is a key parameter for obtaining superior gas-sensing performance; this provides important guidelines for preparing and using porous thin films for gas-sensing applications.
通过简单的溶胶-凝胶化学途径制备了比表面积可控的多孔 TiO 薄膜，并在存在典型的氧化 NO 气体的情况下对其气体传感性能进行了深入研究。通过控制 TiO 与 TTIP（钛异丙醇盐，CHOTi）的摩尔比来控制 TiO 网络的多孔性，从而控制 TiO 薄膜的比表面积，其中使用了粒径约为 20nm 的 TiO 纳米粒子。发现传感器的响应取决于 TiO 薄膜的比表面积。具有较大比表面积的多孔 TiO 薄膜传感器比具有较小比表面积的 TiO 薄膜传感器更灵敏。传感能力的提高归因于 TiO 溶胶在薄膜内形成的多孔网络。我们的结果表明，比表面积是获得优异气体传感性能的关键参数；这为制备和使用多孔薄膜进行气体传感应用提供了重要指导。
