Humidity-Tolerant ppb-level NOx Sensors Based on Ag2Te/CeO2 Nanocomposites for Smart Greenhouse Farming.

IF 8.2 1区化学 Q1 CHEMISTRY, ANALYTICAL

ACS Sensors Pub Date : 2025-05-20 DOI:10.1021/acssensors.5c00055

Weirong Zhou,Guoxuan Gu,Yuan Gao,Jiayin Han,Ning Yu,Chao Liao,Geyu Lu

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引用次数: 0

Abstract

Monitoring trace levels of nitrogen oxides (NOx) in high-humidity agricultural greenhouse environments is essential for both crop growth and workers' health. However, achieving reliable NOx detection under extreme humidity remains challenging. Herein, this work presents an ultralow-detection-limit and highly humidity-tolerant NOx sensor based on Ag2Te/CeO2 nanocomposites. To the best of our knowledge, this is the first demonstration of Ag2Te/CeO2 heterostructures for gas sensing. Among the as-prepared samples, the optimal Ag2Te/CeO2 sample, with a molar ratio of 1:2, exhibited superior response and an ultralow detection limit of 5 ppb NO2 at 65 °C. The sensor response retained over 92% of its regular response even at 99% relative humidity. Density functional theory (DFT) calculations suggest that minimal H2O adsorption on Ag2Te and strong NO2 adsorption on CeO2, along with the formation of an n-n heterojunction, synergistically enhanced performance. Moreover, the sensor was further integrated into an Internet of Plants (IoP) environmental monitoring system. This work provides a new strategy for designing humidity-tolerant NOx sensors and offers a core device for smart agriculture.

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基于Ag2Te/CeO2纳米复合材料的智能温室农业耐湿ppb级NOx传感器。

监测高湿农业温室环境中氮氧化物（NOx）的痕量水平对作物生长和工人健康都至关重要。然而，在极端湿度下实现可靠的NOx检测仍然具有挑战性。本文提出了一种基于Ag2Te/CeO2纳米复合材料的超低检测限和高耐湿性NOx传感器。据我们所知，这是首次证明Ag2Te/CeO2异质结构用于气体传感。在所制备的样品中，当Ag2Te/CeO2摩尔比为1:2时，Ag2Te/CeO2样品在65℃下具有优异的响应性能和5 ppb NO2的超低检测限。即使在99%的相对湿度下，传感器的响应也保持在常规响应的92%以上。密度泛函理论（DFT）计算表明，Ag2Te对H2O的最小吸附和CeO2对NO2的强吸附，以及n-n异质结的形成，协同提高了性能。此外，该传感器还进一步集成到植物互联网（IoP）环境监测系统中。这项工作为设计耐湿NOx传感器提供了新的策略，并为智能农业提供了核心设备。

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

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.