Rajkumar D, Umamahesvari H, Nagaraju P
Research Scholar, Jawaharlal Nehru Technological University Anantapur, Ananthapuramu, Andrapradesh 515002, India.
Sreenivasa Institute of Technology and Management Studies, Chittoor, Andhra Pradesh 517127, India.
J Phys Condens Matter. 2023 Sep 6;35(48). doi: 10.1088/1361-648X/acf0b1.
The gas sensing characteristics of magnesium (Mg)-doped titanium dioxide (TiO) films were investigated using a spray pyrolysis method. TiOThin films with varying Mg doping concentrations (0, 2.5, and 5 weight percentages) were deposited and tested for their gas detection ability to organic compounds such as ethanol, butanol, toluene, xylene, and formaldehyde at room temperature. Results disclosed that introducing Mg into TiOenhanced the gas sensing characteristics, particularly for formaldehyde. Mg-doped TiOfilm improved the change in electrical resistance during gas adsorption, leading to an increased response in formaldehyde detection. Additionally, XRD revealed the crystal structure, while Raman spectroscopy provided insights into molecular vibrational modes of the fabricated films. FESEM allowed for high-resolution imaging of surface morphology, and atomic force microscope assessed surface roughness and other properties of the as deposited samples. UV-Vis spectroscopy was utilized to examine the optical characteristics. The collective results strongly indicated that the introduction of Mg significantly improved the gas-sensing capabilities of TiOfilms, making them highly promising for various gas-sensing applications.
采用喷雾热解法研究了镁（Mg）掺杂二氧化钛（TiO₂）薄膜的气敏特性。制备了不同Mg掺杂浓度（0、2.5和5重量百分比）的TiO₂薄膜，并在室温下测试了它们对乙醇、丁醇、甲苯、二甲苯和甲醛等有机化合物的气体检测能力。结果表明，向TiO₂中引入Mg提高了气敏特性，尤其是对甲醛的气敏特性。Mg掺杂的TiO₂薄膜改善了气体吸附过程中的电阻变化，导致甲醛检测中的响应增加。此外，X射线衍射（XRD）揭示了晶体结构，而拉曼光谱提供了对制备薄膜分子振动模式的见解。场发射扫描电子显微镜（FESEM）实现了表面形貌的高分辨率成像，原子力显微镜评估了沉积样品的表面粗糙度和其他性质。利用紫外可见光谱（UV-Vis）研究了光学特性。总体结果有力地表明，Mg的引入显著提高了TiO₂薄膜的气敏能力，使其在各种气敏应用中极具前景。
