Conductive metal-organic framework for ppb-concentration and highly selective SAW hydrogen sulfide sensing at room temperature

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL Sensors and Actuators B: Chemical Pub Date : 2024-10-21 DOI:10.1016/j.snb.2024.136817

Baile Cui, Xiaoyan Lang, Zixuan Ren, Lina Cheng, Dachi Yang, Wen Wang

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Abstract

Hydrogen sulfide (H₂S) sensing is utilized for monitoring the concentration in environment protection and industrial process control, of which high selectivity and ppb detection limit are required. Here, a ppb-concentration and highly selective surface acoustic wave (SAW) H₂S sensing has been developed with the Cu₃(HHTP)₂ MOFs conductive metal-organic frameworks (MOFs), which have been synthesized by connecting Cu²⁺ with the organic ligands via hydrothermal process. Typically, as-prepared Cu₃(HHTP)₂ MOFs take on shapes including nanoparticles and nanorods. Beneficially, the SAW H₂S sensing presents excellent selectivity to H₂S and enables to detection of H₂S as low as 6 ppb at room temperature (~ 26 ^oC). Remarkably, the SAW sensor prototypes exhibit high sensitivity (0.02 mV/ppb) to 50-2000 ppb H₂S, fast response (T₉₀: 281 s) and 46 day-long stability at room temperature. Theoretically, such excellent H₂S SAW sensing performance might be attributed to the interaction between Cu ions and H₂S molecules and the strong acoustoelectric effect of SAW. Practically, our ppb-concentration and highly selective H₂S SAW sensing have the potential in the real-time detection of H₂S.

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用于室温下 ppb 浓度和高选择性声表面波硫化氢传感的导电金属有机框架

硫化氢（H2S）传感用于环境保护和工业过程控制中的浓度监测，要求具有高选择性和 ppb 检测限。本文利用 Cu3(HHTP)2 MOFs 导电金属有机框架（MOFs）开发了一种 ppb 浓度和高选择性的表面声波（SAW）H2S 传感技术，MOFs 是通过水热法将 Cu2+ 与有机配体连接合成的。通常，制备的 Cu3(HHTP)2 MOF 具有纳米颗粒和纳米棒等形状。有利的是，声表面波 H2S 传感技术对 H2S 具有极佳的选择性，在室温（约 26 oC）下可检测到低至 6 ppb 的 H2S。值得注意的是，声表面波传感器原型对 50-2000 ppb H2S 具有高灵敏度（0.02 mV/ppb）、快速响应（T90：281 秒）和室温下 46 天的稳定性。从理论上讲，如此优异的 H2S 声表面波传感性能可能归功于铜离子与 H2S 分子之间的相互作用以及声表面波的强声电效应。实际上，我们的ppb浓度和高选择性 H2S 声表面波传感技术具有实时检测 H2S 的潜力。

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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.