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Multi-dimensional templated synthesis of hierarchical Fe2O3/NiO composites and their superior ethanol sensing properties promoted by nanoscale p-n heterojunctions.
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-01-08 , DOI: 10.1039/c9dt04185k Shuwen Dong 1 , Di Wu , Wenyuan Gao , Hongshun Hao , Guishan Liu , Shuang Yan
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-01-08 , DOI: 10.1039/c9dt04185k Shuwen Dong 1 , Di Wu , Wenyuan Gao , Hongshun Hao , Guishan Liu , Shuang Yan
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A hierarchical NiO-based nanostructure, constructed from multi-dimensional building blocks, was fabricated by a synthesis method based on electrospinning and solution phase reaction. Fe was incorporated into the NiO nanostructure with highly uniform distribution via ion exchange reaction. A series of Fe2O3/NiO composites with different compositions were successfully synthesized with the hierarchical architecture well preserved. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and inductively coupled plasma-optical emission spectrometry (ICP-OES) were used to characterize the structure and to confirm the formation mechanism of the synthesized products. The gas sensing properties of the Fe2O3/NiO hierarchical composites were systematically investigated. The optimized composition of Fe2O3/NiO shows superior sensing performance towards ethanol, such as high sensitivity, fast response/recovery speed and good selectivity. The high gas sensing performance of the sensing material was mainly due to the completeness of the heterojunction assembly between n-type Fe2O3 and p-type NiO, as well as the amplification effect caused by assembling the heterojunctions on the nanoscale.
中文翻译：
纳米级pn异质结促进了Fe2O3 / NiO分层复合材料的多维模板合成及其优异的乙醇感测性能。
通过基于电纺丝和固溶相反应的合成方法，由多维构建基构建了基于NiO的分层纳米结构。通过离子交换反应将Fe以高度均匀的分布结合到NiO纳米结构中。成功地合成了一系列具有不同组成的Fe2O3 / NiO复合材料，并保留了分级结构。使用扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线衍射（XRD），能量色散X射线光谱（EDS）和电感耦合等离子体发射光谱（ICP-OES）来表征结构并确认合成产物的形成机理。系统地研究了Fe2O3 / NiO层状复合材料的气敏特性。Fe2O3 / NiO的优化成分对乙醇表现出优异的传感性能，例如高灵敏度，快速响应/恢复速度和良好的选择性。感测材料的高气体感测性能主要是由于n型Fe2O3与p型NiO之间的异质结组件的完整性，以及由于在纳米级上组装异质结而导致的放大效应。
更新日期：2020-01-08
中文翻译：
纳米级pn异质结促进了Fe2O3 / NiO分层复合材料的多维模板合成及其优异的乙醇感测性能。
通过基于电纺丝和固溶相反应的合成方法，由多维构建基构建了基于NiO的分层纳米结构。通过离子交换反应将Fe以高度均匀的分布结合到NiO纳米结构中。成功地合成了一系列具有不同组成的Fe2O3 / NiO复合材料，并保留了分级结构。使用扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线衍射（XRD），能量色散X射线光谱（EDS）和电感耦合等离子体发射光谱（ICP-OES）来表征结构并确认合成产物的形成机理。系统地研究了Fe2O3 / NiO层状复合材料的气敏特性。Fe2O3 / NiO的优化成分对乙醇表现出优异的传感性能，例如高灵敏度，快速响应/恢复速度和良好的选择性。感测材料的高气体感测性能主要是由于n型Fe2O3与p型NiO之间的异质结组件的完整性，以及由于在纳米级上组装异质结而导致的放大效应。
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