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Porous alpha-Fe2O3 decorated by Au nanoparticles and their enhanced sensor performance

机译：金纳米粒子修饰的多孔α-Fe2O3及其增强的传感器性能

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摘要

Porous alpha-Fe2O3 was synthesized by simple calcination of a beta-FeOOH precursor derived from a facile hydrothermal method. In the hydrothermal process, only FeCl3 center dot 6H(2)O was used as the source material and no templates or pore-directing agents were needed. The as-prepared porous alpha-Fe2O3 was further employed as a support for loading Au nanoparticles (AuNPs). Due to the advantages of porous nanostructures (large surface area and facile gas diffusion) and the catalytic capability of AuNPs, the derived AuNP-supported porous alpha-Fe2O3 was further investigated for gas sensor applications using ethanol as a probe molecule. Obtained results showed that the AuNP-supported porous alpha-Fe2O3 exhibited a much higher response in comparison to pure alpha-Fe2O3. The enhanced sensor properties are attributed to the unique porous structures of the alpha-Fe2O3 support and active AuNPs for promoting sensing reactions, as well as the synergic electronic interaction between Au and alpha-Fe2O3. It is expected that noble metals such as Ag, Pt and Pd can also be supported on other porous metal oxide semiconductors to explore superior properties of functional nanomaterials.
机译：多孔α-Fe2O3是通过简单煅烧源自简便水热法的β-FeOOH前体合成的。在水热过程中，仅将FeCl3中心点6H（2）O用作源材料，并且不需要模板或孔引导剂。所制备的多孔α-Fe2 O 3被进一步用作负载Au纳米颗粒（AuNPs）的载体。由于多孔纳米结构的优势（大表面积和易扩散的气体）以及AuNPs的催化能力，使用乙醇作为探针分子，进一步研究了衍生的AuNP负载的多孔α-Fe2O3在气体传感器中的应用。所得结果表明，与纯α-Fe2O3相比，AuNP负载的多孔α-Fe2O3表现出更高的响应。增强的传感器性能归因于α-Fe2O3载体和用于促进传感反应的活性AuNP的独特多孔结构，以及Au和α-Fe2O3之间的协同电子相互作用。期望诸如Ag，Pt和Pd的贵金属也可以负载在其他多孔金属氧化物半导体上，以探索功能纳米材料的优异性能。

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