A Facile Way to Simultaneously Improve Humidity-Immunity and Gas Response in Semiconductor Metal Oxide Sensors.

IF 8.2 1区 化学 Q1 CHEMISTRY, ANALYTICAL ACS Sensors Pub Date : 2024-10-29 DOI:10.1021/acssensors.4c01712
Jieon Lee, Haleem Ud Din, Min Ji Ham, Yeonghwan Song, Jung-Hoon Lee, Yong Jung Kwon, Sangwoo Ryu, Young Kyu Jeong
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Abstract

The metal-oxide-based gas sensors show great potential in exhaled breath analysis owing to their simple, fast, and noninvasive characteristics. However, the exhaled breath contains moisture, and the surface-active sites of metal oxides are easily poisoned by water molecules, leading to degradation of the sensor performance, particularly the gas response and selectivity. Therefore, it is essential to develop oxide sensors that can reliably sense target gases over a wide humidity range without sacrificing the gas response. In this study, a facile strategy was proposed to incorporate hydrophobic La into an oxide sensor to simultaneously improve the humidity-stability and sensitivity of NH3 detection for early prediction of kidney failure. WO3 sensors doped with various concentrations of La were successfully synthesized, and their gas-sensing performances under various humid conditions were systematically investigated. Interestingly, a small amount of La doping (1 at. %) effectively prevented water poisoning and improved the gas response simultaneously. This sensor was able to selectively detect NH3 up to 200 ppb with a limit of detection (LOD) of ∼780 ppt over a wide range of humidity. The concurrent enhancement in gas response and humidity-immunity was attributed to the surface hydrophobicity and increased specific surface area caused by the incorporation of La.

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同时改善半导体金属氧化物传感器的湿度-抗干扰性和气体响应的简便方法。
基于金属氧化物的气体传感器因其简单、快速和无创的特点,在呼出气体分析中显示出巨大的潜力。然而,呼出的气体中含有水分,金属氧化物的表面活性位点很容易受到水分子的毒害,导致传感器性能下降,特别是气体响应和选择性。因此,必须开发出既能在宽湿度范围内可靠地感应目标气体,又不影响气体响应的氧化物传感器。本研究提出了一种简便的策略,即在氧化物传感器中加入疏水性 La,以同时提高 NH3 检测的湿度稳定性和灵敏度,从而早期预测肾衰竭。研究人员成功合成了掺杂不同浓度 La 的 WO3 传感器,并系统研究了它们在各种潮湿条件下的气体传感性能。有趣的是,少量的 La 掺杂(1 at.这种传感器能够在很宽的湿度范围内选择性地检测高达 200 ppb 的 NH3,检测限 (LOD) 为 ∼ 780 ppt。气体响应和湿度免疫性的同时增强归功于掺入 La 所带来的表面疏水性和比表面积的增加。
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来源期刊
ACS Sensors
ACS Sensors Chemical Engineering-Bioengineering
CiteScore
14.50
自引率
3.40%
发文量
372
期刊介绍: ACS Sensors is a peer-reviewed research journal that focuses on the dissemination of new and original knowledge in the field of sensor science, particularly those that selectively sense chemical or biological species or processes. The journal covers a broad range of topics, including but not limited to biosensors, chemical sensors, gas sensors, intracellular sensors, single molecule sensors, cell chips, and microfluidic devices. It aims to publish articles that address conceptual advances in sensing technology applicable to various types of analytes or application papers that report on the use of existing sensing concepts in new ways or for new analytes.
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