Trace ammonia detection realized by mixed Ti-Zr metal-organic-frameworks and its application in exhaled breath sensing at room temperature

IF 6.5 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Sensors and Actuators Reports Pub Date : 2024-06-28 DOI:10.1016/j.snr.2024.100216

Zhiming Chen , Zhiwen Shi , Peng Zhang , Li Gao , Bingxin Liu , Lijuan Qiao

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Abstract

The presence of ammonia in exhaled human breath serves as a crucial biomarker for renal diseases. This paper presents a highly sensitive ammonia sensor operable at room temperature, utilizing a Ti/Zr dual metal MOF as its core component, synthesized through a straightforward solvothermal reaction approach. The Ti/Zr-MOF demonstrates excellent responsiveness to ammonia gas, with a detection limit of remarkable sensitivity, reaching as low as 2 ppm. Notably, the sensor exhibits practical insensitivity to similar concentrations of other major interfering breath volatiles, including acetone, ethanol, and saturated moisture. Electron Paramagnetic Resonance (EPR) analysis confirms the presence of oxygen vacancies (Ov) in Ti/Zr-MOF materials, with Ti/Zr-MOF exhibiting stronger Ov signals and the potential for enhanced NH3 adsorption and capture. In-situ FTIR spectrum analysis reveals ammonia-induced -OH (H₂O) moiety formation, indicating a reaction between adsorbed $O_{2}^{-}$ species and ammonia, resulting in decreased electrical resistance of Ti/Zr-MOF.

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混合钛-锌金属有机框架实现的痕量氨检测及其在室温呼气传感中的应用

人体呼出气体中的氨是肾脏疾病的重要生物标志物。本文介绍了一种可在室温下工作的高灵敏度氨气传感器，该传感器以 Ti/Zr 双金属 MOF 为核心成分，通过直接的溶解热反应方法合成。Ti/Zr-MOF 对氨气的反应灵敏度极高，检测限低至 2 ppm。值得注意的是，该传感器对类似浓度的其他主要干扰呼气挥发物（包括丙酮、乙醇和饱和湿气）表现出实际的不敏感性。电子顺磁共振 (EPR) 分析证实了 Ti/Zr-MOF 材料中存在氧空位 (Ov)，Ti/Zr-MOF 显示出更强的 Ov 信号，具有增强 NH3 吸附和捕获的潜力。原位傅立叶变换红外光谱分析揭示了氨诱导的 -OH (H2O) 分子的形成，表明吸附的 O2- 物种与氨发生了反应，从而降低了 Ti/Zr-MOF 的电阻。

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来源期刊

Sensors and Actuators Reports Multiple-

CiteScore

9.60

自引率

0.00%

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审稿时长

49 days

期刊介绍： Sensors and Actuators Reports is a peer-reviewed open access journal launched out from the Sensors and Actuators journal family. Sensors and Actuators Reports is dedicated to publishing new and original works in the field of all type of sensors and actuators, including bio-, chemical-, physical-, and nano- sensors and actuators, which demonstrates significant progress beyond the current state of the art. The journal regularly publishes original research papers, reviews, and short communications. For research papers and short communications, the journal aims to publish the new and original work supported by experimental results and as such purely theoretical works are not accepted.