Low Temperature Ammonia Sensor with Giant Sensitivity and Selectivity based on W@WO2.92 Internal Ohmic Contact Core-Shell Nanostructures

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2024-10-18 DOI:10.1016/j.snb.2024.136792

You Wu, Weilong Chen, Xiang Long, Rui Zhai, Fangrong Qin, Zhuan Zhao, Bin Wang, Shaolin Zhang, Shusheng Pan

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Abstract

Ammonia (NH₃) detection is crucial for both harnessing hydrogen energy and safeguarding public health. However, the NH₃ sensors based on semiconductors is currently constrained by their necessity to operate at elevated temperatures and their limited ability to distinguish NH₃ from other gases. In this study, the high oxygen vacancy W@WO_2.92 core-shell nanostructures have been synthesized by pulsed laser ablation in water. The gas sensors based on W@WO_2.92 nanoparticles response to NH₃ with high sensitivity (|R_a-R_g|/R_a=72.6%@100 ppm, R_a and R_g represent the resistance of the material when exposed to air and the test gas, respectively.) at room temperature with detection limit of 730 ppb. Additionally, the response to NH₃ can achieve 55% even at 5℃, which plays a great role in timely detection of NH₃ during low temperature transportation. Furthermore, the sensors reveal outstanding selectivity toward NH₃ in the presence of 11 other potential interfering gases. This research presents a groundbreaking strategy, holding significant potential for the development of high-performance NH₃ sensors that operate efficiently at low temperatures.

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基于 W@WO2.92 内部欧姆接触核壳纳米结构的具有高灵敏度和选择性的低温氨气传感器

氨气（NH3）检测对于利用氢能和保障公众健康都至关重要。然而，基于半导体的 NH3 传感器目前受限于其必须在高温下工作，以及区分 NH3 和其他气体的能力有限。本研究通过脉冲激光烧蚀法在水中合成了高氧空位的 W@WO2.92 核壳纳米结构。基于 W@WO2.92 纳米粒子的气体传感器在室温下对 NH3 具有高灵敏度（|Ra-Rg|/Ra=72.6%@100 ppm，Ra 和 Rg 分别代表材料暴露于空气和测试气体时的电阻），检测限为 730 ppb。此外，即使在 5℃，对 NH3 的响应也能达到 55%，这对于在低温运输过程中及时检测 NH3 发挥了重要作用。此外，该传感器在存在其他 11 种潜在干扰气体的情况下，对 NH3 具有出色的选择性。这项研究提出了一种开创性的策略，为开发在低温条件下高效运行的高性能 NH3 传感器提供了巨大潜力。

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

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.