首页> 外文期刊>Journal of Analytical & Applied Pyrolysis >Highly sensitive H_2O_2 sensor based on annealed MnO_2/Al_2O_3 nanofibers prepared by a novel spray pyrolysis deposition
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Highly sensitive H_2O_2 sensor based on annealed MnO_2/Al_2O_3 nanofibers prepared by a novel spray pyrolysis deposition

机译:基于新型喷雾热解沉积法制备的退火MnO_2 / Al_2O_3纳米纤维的高灵敏度H_2O_2传感器

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摘要

In the present work, we report the annealing effect on the properties of MnO2 nanofibers prepared onto sapphire substrate for electrochemical detection of H2O2. The MnO2/sapphire nanocomposite films prepared by a novel spray deposition route were investigated for its optical and microstructural properties. The red shift in the absorption peak with increase in the annealing temperature was attributed to strain relaxation in MnO2 crystallites. The film annealed at 400 degrees C show significant change in morphology from nanofibre to nanonoodles like structure with large diameter, which provided large electro chemical active surface favorable for sensing. The electrochemical performance of nanocomposited MnO2/Al2O3 electrode annealed at 400 degrees C revealed larger specific capacitance of 320 F/g. The sensor exhibited detection limit as low as 0.05 mu M towards H2O2, suggesting that the MnO2/Al2O3 electrode represents a challenging opportunity to develop next generation of electrochemical sensing material.
机译:在本工作中,我们报告了退火对蓝宝石衬底上制备的MnO2纳米纤维的性能的影响,用于电化学检测H2O2。研究了通过新颖的喷涂方法制备的MnO2 /蓝宝石纳米复合薄膜的光学和微观结构性能。随着退火温度的升高,吸收峰的红移归因于MnO2晶体中的应变松弛。在400℃退火的膜的形态发生了显着变化,从纳米纤维到纳米面条状的大直径结构,提供了有利于感应的大电化学活性表面。纳米复合MnO2 / Al2O3电极在400℃退火后的电化学性能显示出较大的比电容320 F / g。该传感器对H2O2的检测限低至0.05μM,这表明MnO2 / Al2O3电极代表了开发下一代电化学传感材料的挑战性机遇。

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