Au-catalyzed Fe2O3@SnO2 heterostructured nanowires for improved low-concentration acetone sensing

IF 1.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2024-11-04 DOI:10.1007/s10832-024-00378-6

Sung-Ki Min, Hong-Seok Kim, Sung-Pil Chang

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引用次数: 0

Abstract

This study presents the synthesis of Au and Fe₂O₃ nanoparticles (NPs) embedded on SnO₂ nanowires (NWs) using a vapor–liquid–solid (VLS) and hydrothermal method. The resulting Au@Fe₂O₃@SnO₂ NW composites demonstrated a remarkable response of 133.05 at an optimal operating temperature of 225 °C when exposed to 20 ppm of acetone gas, significantly outperforming pure SnO₂ NWs by a factor of 23. These composites also exhibited excellent selectivity and long-term stability in acetone gas detection. A thorough investigation into the sensor’s operational mechanism revealed that the interactions between acetone molecules and adsorbed oxygen, along with electron transfer processes, result in changes in sensor resistance. The superior gas-sensing properties are primarily attributed to the well-defined one-dimensional (1D) microstructure, featuring closely connected n–n heterojunctions of SnO₂ and Fe₂O₃, which provide a large specific surface area with numerous active sites. These sites facilitate the reaction between acetone molecules and oxygen ions on the surface, enhanced by the catalytic effect of Au. This work underscores the potential of this fabrication method for developing gas sensors capable of detecting acetone at low ppm levels in a 225 °C environment.

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金催化Fe2O3@SnO2异质结构纳米线改善低浓度丙酮传感

本研究采用气液固相法和水热法制备了嵌入SnO2纳米线（NWs）上的Au和Fe2O3纳米颗粒。所得Au@Fe2O3@SnO2 NW复合材料在225°C的最佳工作温度下，当暴露于20 ppm的丙酮气体中时，其响应率为133.05，明显优于纯SnO2 NW 23倍。这些复合材料在丙酮气体检测中也表现出良好的选择性和长期稳定性。对传感器工作机制的深入研究表明，丙酮分子与吸附氧之间的相互作用以及电子转移过程导致传感器电阻的变化。优异的气敏性能主要归功于良好定义的一维（1D）微观结构，具有紧密连接的SnO2和Fe2O3的n-n异质结，提供了大的比表面积和许多活性位点。这些位点有利于丙酮分子与表面氧离子之间的反应，并在Au的催化作用下得到增强。这项工作强调了这种制造方法在开发能够在225°C环境中检测低ppm水平丙酮的气体传感器方面的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.