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A comparison of the ethanol sensing properties of alpha-iron oxide nanostructures prepared via the sol-gel and electrospinning techniques

机译:通过溶胶-凝胶和静电纺丝技术制备的α-氧化铁纳米结构的乙醇感测性能比较

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摘要

Haematite (alpha-Fe2O3) nanostructures were synthesized via a Pechini sol-gel method (PSG) and an electrospinning (ES) technique. Their texture and morphology were investigated by scanning and transmission electron microscopy. alpha-Fe2O3 nanoparticles were obtained by the PSG method, whereas fibrous structures consisting of interconnected particles were synthesized through the ES technique. The crystallinity of the alpha-Fe2O3 nanostructures was also studied by means of x-ray diffraction and Raman spectroscopy. Gas-sensing devices were fabricated by printing the synthesized samples on ceramic substrates provided with interdigitated Pt electrodes. The sensors were tested towards low concentrations of ethanol in air in the temperature range (200-400 degrees C). The results show that the alpha-Fe2O3 nanostructures exhibit somewhat different gas-sensing properties and, interestingly, their sensing behaviour is strongly temperature-dependent. The availability of active sites for oxygen chemisorption and the diffusion of the analyte gas within the sensing layer structure are hypothesized to be the key factors responsible for the different sensing behaviour observed.
机译:通过Pechini溶胶-凝胶法(PSG)和电纺丝(ES)技术合成了赤铁矿(α-Fe2O3)纳米结构。通过扫描和透射电子显微镜研究了它们的质地和形态。通过PSG方法获得了α-Fe2O3纳米颗粒,而通过ES技术合成了由相互连接的颗粒组成的纤维结构。还通过X射线衍射和拉曼光谱研究了α-Fe2 O 3纳米结构的结晶度。通过将合成的样品印刷在配有叉指式Pt电极的陶瓷基板上来制造气体传感装置。对传感器进行了针对温度范围(200-400摄氏度)中空气中乙醇浓度低的测试。结果表明,α-Fe2O3纳米结构表现出一些不同的气体传感特性,有趣的是,它们的传感行为与温度密切相关。假设氧化学吸附的活性位点的可用性以及分析物气体在传感层结构内的扩散是造成观察到的不同传感行为的关键因素。

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