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Co1−xBaxFe2O4 (x = 0, 0.25, 0.5, 0.75 and 1) nanoferrites as gas sensor towards NO2 and NH3 gases
RSC Advances ( IF 3.9 ) Pub Date : 2020-9-23 , DOI: 10.1039/d0ra04303f Hariom Pawar 1 , Meenu Khan 1 , Chhavi Mitharwal 2 , U K Dwivedi 1 , Supratim Mitra 2 , Deepshikha Rathore 1
RSC Advances ( IF 3.9 ) Pub Date : 2020-9-23 , DOI: 10.1039/d0ra04303f Hariom Pawar 1 , Meenu Khan 1 , Chhavi Mitharwal 2 , U K Dwivedi 1 , Supratim Mitra 2 , Deepshikha Rathore 1
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Co1−xBaxFe2O4 (x = 0, 0.25, 0.5, 0.75 and 1) nanoferrites were synthesized using a controlled chemical co-precipitation technique. Their structural, optical, dielectric and gas sensing properties were characterized by X-ray diffractometry, UV-Vis spectroscopy and an LCR meter with a gas sensing unit. The crystalline sizes were estimated using the Scherrer formula and were found to be 7.8 nm, 14.4 nm, 21.8 nm, 16.5 nm and 30.3 nm for x = 0, 0.25, 0.5, 0.75 and 1, respectively. The fundamental optical band gaps were calculated by extrapolating the linear part of (αhυ)2 vs. hυ of the synthesized nanoferrites. The SEM and EDX spectra also confirmed the formation of nanoferrites. Dramatic behavior was observed in the dielectric constant and dissipation factor with varying temperature, which provides a substantial amount of information about electric polarization. The synthesized nanoferrites were tested towards NO2 and NH3 gases. The order of sensitivity (%) towards NH3 was analyzed as x = 0.75 > x = 0.5 > x = 0.25 > x = 0 > x = 1, while the order was x = 0 > 0.75 > 1 > 0.5 > 0.25 for NO2 gas.
中文翻译：
Co1−xBaxFe2O4 (x = 0, 0.25, 0.5, 0.75 和 1) 纳米铁氧体作为对 NO2 和 NH3 气体的气体传感器
Co 1− x Ba x Fe 2 O 4 ( x = 0, 0.25, 0.5, 0.75 和 1) 纳米铁氧体是使用受控化学共沉淀技术合成的。它们的结构、光学、介电和气体传感特性通过 X 射线衍射、UV-Vis 光谱和带有气体传感单元的 LCR 计进行了表征。使用 Scherrer 公式估计晶体尺寸，发现对于x = 0、0.25、0.5、0.75 和 1，晶体尺寸分别为 7.8 nm、14.4 nm、21.8 nm、16.5 nm 和 30.3 nm。通过外推 ( αhυ ) 2 与hυ的线性部分来计算基本光学带隙合成的纳米铁氧体。SEM 和 EDX 光谱也证实了纳米铁氧体的形成。随着温度的变化，在介电常数和耗散因数中观察到了显着的行为，这提供了大量关于电极化的信息。合成的纳米铁氧体对 NO 2和 NH 3气体进行了测试。对 NH 3的灵敏度 (%) 顺序为x = 0.75 > x = 0.5 > x = 0.25 > x = 0 > x = 1，而 NO 的顺序为x = 0 > 0.75 > 1 > 0.5 > 0.25 2气。
更新日期：2020-09-23
中文翻译：
Co1−xBaxFe2O4 (x = 0, 0.25, 0.5, 0.75 和 1) 纳米铁氧体作为对 NO2 和 NH3 气体的气体传感器
Co 1− x Ba x Fe 2 O 4 ( x = 0, 0.25, 0.5, 0.75 和 1) 纳米铁氧体是使用受控化学共沉淀技术合成的。它们的结构、光学、介电和气体传感特性通过 X 射线衍射、UV-Vis 光谱和带有气体传感单元的 LCR 计进行了表征。使用 Scherrer 公式估计晶体尺寸，发现对于x = 0、0.25、0.5、0.75 和 1，晶体尺寸分别为 7.8 nm、14.4 nm、21.8 nm、16.5 nm 和 30.3 nm。通过外推 ( αhυ ) 2 与hυ的线性部分来计算基本光学带隙合成的纳米铁氧体。SEM 和 EDX 光谱也证实了纳米铁氧体的形成。随着温度的变化，在介电常数和耗散因数中观察到了显着的行为，这提供了大量关于电极化的信息。合成的纳米铁氧体对 NO 2和 NH 3气体进行了测试。对 NH 3的灵敏度 (%) 顺序为x = 0.75 > x = 0.5 > x = 0.25 > x = 0 > x = 1，而 NO 的顺序为x = 0 > 0.75 > 1 > 0.5 > 0.25 2气。
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