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Pd Nanoclusters-Sensitized MIL-125/TiO2 Nanochannel Arrays for Sensitive and Humidity-Resistant Formaldehyde Detection at Room Temperature
ACS Sensors ( IF 8.2 ) Pub Date : 2024-07-22 , DOI: 10.1021/acssensors.4c01120 Jiahui Zhao 1 , Haiquan Wang 1 , Zhen-Kun He 1 , Wenwen Zhang 1 , Yang Du 1 , Xinze Li 1 , Shujia Wang 1 , Junjian Zhao 1 , Yan-Yan Song 1 , Zhida Gao 1
ACS Sensors ( IF 8.2 ) Pub Date : 2024-07-22 , DOI: 10.1021/acssensors.4c01120 Jiahui Zhao 1 , Haiquan Wang 1 , Zhen-Kun He 1 , Wenwen Zhang 1 , Yang Du 1 , Xinze Li 1 , Shujia Wang 1 , Junjian Zhao 1 , Yan-Yan Song 1 , Zhida Gao 1
Affiliation
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Among the various hazardous substances, formaldehyde (HCHO), produced worldwide from wood furniture, dyeing auxiliaries, or as a preservative in consumer products, is harmful to human health. In this study, a sensitive room-temperature HCHO sensor, MTiNCs/Pd, has been developed by integrating Pd nanoclusters (PdNCs) into mesoporous MIL-125(Ti)-decorated TiO2 nanochannel arrays (TiNCs). Thanks to the enrichment effect of the mesoporous structure of MIL-125 and the large surface area offered by TiNCs, the resulting gas sensor accesses significantly enhanced HCHO adsorption capacity. The sufficient energetic active defects formed on PdNCs further allow an electron-extracting effect, thus effectively separating the photogenerated electrons and holes at the interface. The resulting HCHO sensor exhibits a short response/recovery time (37 s/12 s) and excellent sensitivity with a low limit of detection (4.51 ppb) under ultraviolet (UV) irradiation. More importantly, the cyclic redox reactions of Pdδ+ in PdNCs facilitated the regeneration of O2–(ads), thus ensuring a stable and excellent gas sensing performance even under a high-humidity environment. As a proof-of-principle of this design, a wearable gas sensing band is developed for the real-time and on-site detection of HCHO in cigarette smoke, with the potential as an independent device for environmental monitoring and other smart sensing systems.
中文翻译：
Pd 纳米团簇敏化 MIL-125/TiO2 纳米通道阵列，用于室温下灵敏且耐湿的甲醛检测
在各种有害物质中，甲醛（HCHO）在世界范围内从木质家具、染色助剂或消费品中作为防腐剂产生，对人体健康有害。在这项研究中，通过将Pd纳米团簇(PdNCs)集成到介孔MIL-125(Ti)装饰的TiO 2纳米通道阵列(TiNCs)中，开发了一种灵敏的室温HCHO传感器MTiNCs/Pd。由于MIL-125介孔结构的富集效应和TiNCs提供的大表面积，所得气体传感器显着增强了HCHO吸附能力。 PdNCs上形成的足够高能的活性缺陷进一步产生电子提取效应，从而有效地分离界面处的光生电子和空穴。由此产生的 HCHO 传感器在紫外线 (UV) 照射下表现出较短的响应/恢复时间 (37 s/12 s) 和出色的灵敏度以及较低的检测限 (4.51 ppb)。更重要的是，PdNCs中Pdδ +的循环氧化还原反应促进了O 2 - (ads)的再生，从而确保即使在高湿度环境下也能保持稳定和优异的气敏性能。作为该设计的原理验证，我们开发了一种可穿戴气体传感带，用于实时现场检测香烟烟雾中的甲醛，具有作为环境监测和其他智能传感系统的独立设备的潜力。
更新日期：2024-07-22
中文翻译：
Pd 纳米团簇敏化 MIL-125/TiO2 纳米通道阵列，用于室温下灵敏且耐湿的甲醛检测
在各种有害物质中，甲醛（HCHO）在世界范围内从木质家具、染色助剂或消费品中作为防腐剂产生，对人体健康有害。在这项研究中，通过将Pd纳米团簇(PdNCs)集成到介孔MIL-125(Ti)装饰的TiO 2纳米通道阵列(TiNCs)中，开发了一种灵敏的室温HCHO传感器MTiNCs/Pd。由于MIL-125介孔结构的富集效应和TiNCs提供的大表面积，所得气体传感器显着增强了HCHO吸附能力。 PdNCs上形成的足够高能的活性缺陷进一步产生电子提取效应，从而有效地分离界面处的光生电子和空穴。由此产生的 HCHO 传感器在紫外线 (UV) 照射下表现出较短的响应/恢复时间 (37 s/12 s) 和出色的灵敏度以及较低的检测限 (4.51 ppb)。更重要的是，PdNCs中Pdδ +的循环氧化还原反应促进了O 2 - (ads)的再生，从而确保即使在高湿度环境下也能保持稳定和优异的气敏性能。作为该设计的原理验证，我们开发了一种可穿戴气体传感带，用于实时现场检测香烟烟雾中的甲醛，具有作为环境监测和其他智能传感系统的独立设备的潜力。
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