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Optical, spectroscopic and fiber optic gas sensing of potassium doped a-Fe_2O_3 nanostructures

机译：钾掺杂A-Fe_2O_3纳米结构的光学，光谱和光纤气体传感

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摘要

Nanocrystalline pure and potassium doped alpha-Fe2-x KxO3-delta (x = 0.03, 0.05) fiber optic gas sensors are proposed for sensing acetone, ethanol, methanol, and ammonia at room temperature. The nanostructured pure alpha-Fe2O3 and potassium doped alpha-Fe2-x KxO3-delta (x = 0.03, 0.05) were synthesized by conventional co-precipitation method and crystallite sizes were determined to be 6.02 nm for pure, 5.79 nm for 3%K-Fe2O3 and 3.97 nm for 5%K-Fe2O3. Synthesized nanostructures were characterized using characterization tools such as powder X-Ray Diffraction (XRD) for Structural phase composition, Fourier Transform Infrared Spectroscopy (FTIR) for functional group analysis and Scanning Electron Microscopy (SEM) for surface morphology, Energy-dispersive X-ray spectroscopy (EDX) for elemental analysis. UV-Vis spectroscopy showed optical characteristic properties exhibiting significant variation in absorbance for 5%K-Fe2O3. The gas sensitivity and selectivity characteristics were investigated for pure and doped materials. Time response of 5%K-Fe2O3 for all gases was taken. 5%K-Fe2O3 showed good gas selectivity and higher sensitivity towards acetone gas and gave relatively faster response. These substantiated the influence of potassium doping in alpha-Fe2O3 nanostructure.
机译：纳米晶纯和磷酸钾α-Fe2-X KXO3-Delta（x = 0.03,0.05）光纤气体传感器，用于在室温下感测丙酮，乙醇，甲醇和氨。通过常规共沉淀法合成纳米结构纯α-Fe2O3和掺杂α-Fe2-x KxO3-Delta（x = 0.03,0.05），并测定微晶尺寸为纯度为6.02nm，5.79nm，3％k -Fe2O3和3.97nm，5％K-Fe2O3。合成纳米结构使用表征工具，如粉末X射线衍射（XRD），用于结构相组合物，傅里叶变换红外光谱（FTIR）用于功能群分析和扫描电子显微镜（SEM），用于表面形态，能量分散X射线用于元素分析的光谱学（EDX）。 UV-Vis光谱显示光学特性表现出5％K-Fe2O3的吸光度显着变化的光学特性。研究了纯净和掺杂材料的气体敏感性和选择性特征。采用5％K-Fe2O3对所有气体的时间响应。 5％K-Fe2O3显示出良好的气体选择性和对丙酮气体的敏感性较高，并提供相对较快的反应。这些证实了施用钾掺杂在α-Fe2O3纳米结构中的影响。

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