Electrochemical Materials Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, India.
Department of Physics, Dattajirao Kadam Arts, Science and Commerce College, Ichalkaranji 416 115, India.
J Colloid Interface Sci. 2017 Jul 1;497:181-192. doi: 10.1016/j.jcis.2017.02.067. Epub 2017 Mar 1.
Polycrystalline CoFeO thin films are deposited onto the quartz substrates by spray pyrolysis technique. Rietveld refinement analysis confirmed the films are polycrystalline in nature with spinel cubic crystal structure. Rietveld refinement analysis was employed to estimate the cation distribution in spinel lattice sites. Surface micrographs shows the granular morphology with average grain size decreases with increase in solution concentration. The presence of two characteristic absorption bands around 579 and 391cm in the FTIR study confirms the formation of single phase CoFeO. Vibrating sample magnetometer measurement confirmed the predominant ferrimagnetic nature of thin films which confirms the maximum saturation magnetization with moderate coercivity was useful for making effective gas sensor. The gas response towards different operating temperatures, gas concentrations and solution concentrations was systematically studied. The films show the maximum gas response 70% at 0.1M solution concentration at 150°C operating temperature. The films are well selective towards NO as compared with other test gases with good reproducibility.
采用喷雾热解法将多晶 CoFeO 薄膜沉积在石英衬底上。Rietveld 精修分析证实了薄膜具有多晶特性，属于尖晶石立方晶体结构。Rietveld 精修分析用于估计尖晶石晶格位置上的阳离子分布。表面形貌图显示出具有平均晶粒尺寸随溶液浓度增加而减小的颗粒形态。在 FTIR 研究中，两个特征吸收带分别位于 579 和 391cm 处，证实了单相 CoFeO 的形成。振动样品磁强计测量证实了薄膜的主要亚铁磁性，这证实了具有中等矫顽力的最大饱和磁化强度可用于制造有效的气体传感器。系统研究了薄膜对不同工作温度、气体浓度和溶液浓度的气体响应。薄膜在 150°C 的工作温度和 0.1M 溶液浓度下表现出最大的气体响应 70%。与其他测试气体相比，薄膜对 NO 具有良好的选择性和重现性。
