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首页> 美国卫生研究院文献>Nanoscale Research Letters >Highly Sensitive Ethanol Chemical Sensor Based on Novel Ag-Doped Mesoporous α–Fe2O3 Prepared by Modified Sol-Gel Process
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Highly Sensitive Ethanol Chemical Sensor Based on Novel Ag-Doped Mesoporous α–Fe2O3 Prepared by Modified Sol-Gel Process

机译：基于新型溶胶-凝胶法制备的Ag掺杂介孔α-Fe2O3的高灵敏度乙醇化学传感器

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摘要

Mesoporous α–Fe2O3 has been synthesized via a simple sol-gel procedure in the presence of Pluronic (F-127) triblock copolymer as structure directing agent. Silver (Ag) nanoparticles were deposited onto α–Fe2O3 matrix by the photochemical reduction approach. Morphological analysis revealed the formation of Ag nanoparticles with small sizes < 20 nm onto the mesoporous structure of α–Fe2O3 possessing < 50 nm semi-spherical shape. The XRD, FTIR, Raman, UV-vis, PL, and N2 sorption isotherm studies confirmed the high crystallinity, mesoporosity, and optical characteristics of the synthesized product. The electrochemical sensing toward liquid ethanol has been performed using the current devolved Ag/α–Fe2O3-modified glassy carbon electrode (GCE) by cyclic voltammetry (CV) and current potential (I-V) techniques, and the obtained results were compared with bare GCE or pure α–Fe2O3. Mesoporous Ag/α–Fe2O3 was found to largely enhance the sensor sensitivity and it exhibited excellent sensing characteristics during the precision detection of low concentrations of ethanol. High and reproducible sensitivity of 41.27 μAmM− 1 cm− 2 at lower ethanol concentration region (0.05 to 0.8 mM) and 2.93 μAmM− 1 cm− 2 at higher concentration zone (0.8 to 15 mM), with a limit of detection (LOD) of 15.4 μM have been achieved. Investigation on reaction kinetics revealed a characteristic behavior of mixed surface and diffusion-controlled processes. Detailed sensing studies revealed also that the sensitivity toward ethanol was higher than that of methanol or isopropanol. With further effort in developing the synthesis and fabrication approaches, a proper utility for the current proposed protocol for fabricating a better sensor device performance is possible.
机译：介孔α–Fe2O3通过简单的溶胶-凝胶法在Pluronic（F-127）三嵌段共聚物作为结构导向剂的存在下合成。通过光化学还原法将银（Ag）纳米颗粒沉积到α–Fe2O3基质上。形态分析表明，在具有<50 nm半球形形状的α–Fe2O3的介孔结构上形成了尺寸小于20 nm的Ag纳米颗粒。 XRD，FTIR，拉曼，UV-vis，PL和N2吸附等温线研究证实了合成产物的高结晶度，介孔率和光学特性。使用电流降解的Ag /α-Fe2O3修饰的玻碳电极（GCE）通过循环伏安法（CV）和电流电势（IV）技术对液体乙醇进行电化学检测，并将所得结果与裸露的GCE或纯α–Fe2O3。发现中孔Ag /α-Fe2O3可以大大提高传感器的灵敏度，并且在低浓度乙醇的精密检测过程中表现出出色的传感特性。在乙醇浓度较低的区域（0.05至0.8mM）和2.93μAmM − 1 cm时具有41.27μAmM − 1 cm − 2 的高灵敏度和重现性在较高浓度区域（0.8至15 mM）达到-2 ，检测限（LOD）为15.4μM。反应动力学的研究揭示了混合表面和扩散控制过程的特征行为。详细的传感研究还显示，对乙醇的敏感性高于甲醇或异丙醇。随着开发合成和制造方法的进一步努力，对于当前提出的协议的适当实用性用于制造更好的传感器设备性能是可能的。

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