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High-response n-butanol gas sensor based on ZnO/In2O3 heterostructure

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Abstract

In this study, ZnO/In2O3-heterostructured nanosheets were prepared using a one-step hydrothermal method. The effects of ZnO content on the gas-sensing performance were discussed, with ZnO/In2O3-2 exhibiting the highest performance among the prepared sensors. The response of ZnO/In2O3-2 to n-butanol was 302 at 26 °C, which was 11.93 times higher than that of pure In2O3. Among the eight tested gases, ZnO/In2O3-2 displayed the highest response to n-butanol. Moreover, the lower detection limit of the ZnO/In2O3 nanosheets was reduced from 10 × 10−6 to 0.1 × 10−6 (for pure In2O3 nanosheets) toward n-butanol. This is because the doping of Zn2+ increases the number of oxygen vacancies on the sensor surface and allows the formation of an n–n heterostructure between ZnO and In2O3, which increases the initial resistance of the sensor.

Graphical abstract

摘要

在这项研究中, 采用一步水热法制备了ZnO/In2O3异质结构纳米片。讨论了氧化锌含量对气体传感性能的影响, 其中ZnO/In2O3-2在所制备的传感器中表现出最高的性能。ZnO/In2O3-2在262 °C的条件下, 对正丁醇的响应是302, 是纯In2O3的11.93倍。在8种测试气体中, ZnO/In2O3-2对正丁醇具有最高响应。此外, ZnO/In2O3纳米片对正丁醇的检测下限从10 × 10−6降低到0.1 × 10−6 (与纯In2O3纳米片相比) 。这是因为Zn2+离子掺入增加了传感器表面的氧空位数量, 并使ZnO和In2O3之间形成n-n异质结构, 从而增加了传感器的初始电阻。

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Acknowledgements

This study was financially supported by the National R&D Program of China (No. 2020YFB2008702), the National Natural Science Foundation of China (Nos. 62033002, 61833006, 62071112 and 61973058), the 111 Project (No. B16009), the Fundamental Research Funds for the Central Universities in China (Nos. N180408018, N2004019 and N2004028), Liaoning Revitalization Talents Program (No. XLYC1807198), Liaoning Province Natural Science Foundation (No. 2020-KF-11-04), Hebei Natural Science Foundation (No. F2020501040).

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  1. College of Information Science and Engineering, Northeastern University, Shenyang, 110819, China

    Zhen-Yu Yuan, Fan Yang, Hong-Min Zhu & Fan-Li Meng

  2. Spectroscopy Department, National Research Centre, Giza, 12622, Egypt

    Medhat Ibrahim

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Yuan, ZY., Yang, F., Zhu, HM. et al. High-response n-butanol gas sensor based on ZnO/In2O3 heterostructure. Rare Met. 42, 198–209 (2023). https://doi.org/10.1007/s12598-022-02162-3

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