Bimetallic co-growth of In2O3/Co3O4 porous nanorods for rapid detection of acetone gas

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-07-11 DOI:10.1016/j.apsusc.2025.163972

Tao Wang , Nan Yang , Changyu Duan , Longyun Li , Yuetong Cao , Ke Wang , Zhongqi Zhu , Genlin Zhang , Yumin Zhang , Qingju Liu , Jin Zhang

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Abstract

Acetone, a critical biomarker in exhaled breath for the diagnosis of diabetes, necessitates the development of high-performance gas sensors for real-time monitoring. In this work, bimetallic In₂O₃/Co₃O₄ porous nanorods with tunable In/Co molar ratios were synthesized via a hydrothermal approach. The optimized sensor 3-ICO (In:Co = 3:10, molar ratio), exhibited remarkable acetone-sensing performance with a high response of 125.6–10 ppm acetone at 250 °C, ultrafast response/recovery times (45 s/19 s), outstanding selectivity, and long-term stability. The integration of materials characterization with density functional theory (DFT) simulations demonstrated that the p-n heterojunction formed between Co₃O₄ and In₂O₃ facilitates interfacial charge transfer, enhancing both the oxygen vacancy concentration and specific surface area. These synergistic effects significantly improve acetone adsorption energy and electron transport efficiency. This work highlights the pivotal role of heterojunction engineering in optimizing the detection performance of metal-oxide semiconductors for low-concentration volatile organic compounds (VOCs), offering promising applications in non-invasive diabetes diagnosis.

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双金属共生长In2O3/Co3O4多孔纳米棒用于丙酮气体的快速检测

丙酮是诊断糖尿病的关键生物标志物，因此需要开发高性能的气体传感器进行实时监测。本文采用水热法合成了In/Co摩尔比可调的双金属In2O3/Co3O4多孔纳米棒。优化后的传感器3-ICO （In:Co = 3:10，摩尔比）在250 °C下具有125.6 ~ 10 ppm丙酮的高响应性能，超快的响应/恢复时间（45 s/19 s），出色的选择性和长期稳定性。材料表征与密度泛函理论（DFT）模拟的结合表明，Co3O4和In2O3之间形成的p-n异质结促进了界面电荷转移，提高了氧空位浓度和比表面积。这些协同效应显著提高了丙酮的吸附能和电子传递效率。这项工作强调了异质结工程在优化金属氧化物半导体对低浓度挥发性有机化合物（VOCs）的检测性能方面的关键作用，为非侵入性糖尿病诊断提供了有前途的应用。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.