Construction of heterojunctions of In2O3 nanocube with NiO for rapid detection of carbon monoxide

IF 5.3 2区化学 Q1 CHEMISTRY, ANALYTICAL

Microchimica Acta Pub Date : 2025-03-20 DOI:10.1007/s00604-025-07099-9

Saisai Zhang, Yi Zheng, Bo Zhang, Bowen Zhang, Na Luo, Yan Wang

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Abstract

Aimed at realizing the rapid and effective detection of carbon monoxide (CO) in high humidity environments, the NiO-modified In₂O₃ nanocube with different NiO loadings (1, 3, 5 mol%) was synthesized via a two-step method. Morphological characterizations revealed that the NiO modification did not alter the cubic morphology of In₂O₃, and the nanocube showed a porous structure with pore sizes of around 10 nm. The XPS analysis evidenced that the 3 mol% NiO/In₂O₃ sample owns more Ov contents (40.62%) than that of the pure In₂O₃ sample (31.73%). The gas sensing measurements demonstrated that the 3 mol% NiO/In₂O₃ sensor exhibited a decreased optimal operating temperature of 260℃ (300℃ for In₂O₃) and good stability. Compared with pristine In₂O₃, the 3 mol% NiO/In₂O₃ nanocube showed an enhanced response of 4.16 (2.73 for In₂O₃) to 500 ppm CO and a rapid response/recovery time (10 s/13 s) toward CO. Furthermore, the 3 mol% NiO/In₂O₃ sensor exhibited superior humidity resistance, enabling accurate CO detection even at 85% relative humidity. The enhanced gas sensing performance of the NiO/In₂O₃ nanocube is attributed to the unique porous cubic structure and the formation of p-n heterojunctions. This work demonstrates a viable strategy to improve the CO sensing capabilities of In₂O₃ by constructing NiO/In₂O₃ heterostructures.

Graphical abstract

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为了实现在高湿度环境中快速有效地检测一氧化碳（CO），通过两步法合成了不同NiO负载量（1、3、5 mol%）的NiO修饰In2O3纳米立方体。形态学表征显示，NiO修饰并没有改变In2O3的立方形态，纳米立方体呈现出多孔结构，孔径约为10 nm。XPS 分析表明，3 mol% NiO/In2O3 样品的 Ov 含量（40.62%）高于纯 In2O3 样品的 Ov 含量（31.73%）。气体传感测量结果表明，3 mol% NiO/In2O3 传感器的最佳工作温度较低，为 260℃（In2O3 为 300℃），并且具有良好的稳定性。与纯 In2O3 相比，3 mol% NiO/In2O3 纳米立方体对 500 ppm CO 的响应增强了 4.16（In2O3 为 2.73），对 CO 的响应/恢复时间（10 秒/13 秒）更快。此外，3 mol% NiO/In2O3 传感器还具有优异的耐湿性，即使在相对湿度为 85% 的情况下也能准确检测到一氧化碳。NiO/In2O3 纳米立方体气体传感性能的增强归功于其独特的多孔立方体结构和 p-n 异质结的形成。这项工作展示了一种可行的策略，即通过构建 NiO/In2O3 异质结构来提高 In2O3 的 CO 传感能力。

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来源期刊

Microchimica Acta 化学-分析化学

CiteScore

9.80

自引率

5.30%

发文量

410

审稿时长

2.7 months

期刊介绍： As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.