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Multiwalled Carbon Nanotube-Templated Nickel Porphyrin Covalent Organic Framework for Pencil-Drawn Noninvasive Respiration Sensors
ACS Sensors ( IF 8.2 ) Pub Date : 2024-08-26 , DOI: 10.1021/acssensors.4c01096
Peini Zhao 1 , Yujiao Bai 1 , Chuanrui Zhao 1 , Wenqing Gao 1 , Pan Ma 2 , Jinghua Yu 1 , Yan Zhang 1 , Peihua Zhu 1
Affiliation  

Paper-integrated configuration with miniaturized functionality represents one of the future main green electronics. In this study, a paper-based respiration sensor was prepared using a multiwalled carbon nanotube-templated nickel porphyrin covalent organic framework (MWCNTs@COFNiP-Ph) as an electrical identification component and pencil-drawn graphite electric circuits as interdigitated electrodes (IDEs). The MWCNTs@COFNiP-Ph not only inherited the high gas sensing performance of porphyrin and the aperture induction effect of COFs but also overcame the shielding effect between phases through the MWCNT template. Furthermore, it possessed highly exposed M–N4 metallic active sites and unique periodic porosity, thereby effectively addressing the key technical issue of room-temperature sensing for the respiration sensor. Meanwhile, the introduction of a pencil-drawing approach on common printing papers facilitates the inexpensive and simple manufacturing of the as-fabricated graphite IDE. Based on the above advantages, the MWCNTs@COFNiP-Ph respiration sensor had the characteristics of wide detection range (1–500 ppm), low detection limit (30 ppb), acceptable flexibility for toluene, and rapid response/recovery time (32 s/116 s). These advancements facilitated the integration of the respiration sensor into surgical masks and clothes with maximum functionality at a minimized size and weight. Moreover, the primary internal mechanism of COFNiP-Ph for this efficient toluene detection was investigated through in situ FTIR spectra, thereby directly elucidating that the chemisorption interaction of oxygen modulated the depletion layers, resulting in alterations in sensor resistance upon exposure to the target gas. The encouraging results revealed the feasibility of employing a paper-sensing system as a wearable platform in green electronics.

中文翻译:


用于铅笔绘制无创呼吸传感器的多壁碳纳米管模板镍卟啉共价有机框架



具有小型化功能的纸集成结构代表了未来主要的绿色电子产品之一。在这项研究中,使用多壁碳纳米管模板镍卟啉共价有机骨架(MWCNTs@COF NiP-Ph )作为电气识别组件和铅笔绘制的石墨电路作为叉指电极(IDE)制备了纸基呼吸传感器。 MWCNTs@COF NiP-Ph不仅继承了卟啉的高气敏性能和COF的孔径诱导效应,而且通过MWCNT模板克服了相间的屏蔽效应。此外,它还具有高度暴露的M-N 4金属活性位点和独特的周期性孔隙率,从而有效解决了呼吸传感器室温传感的关键技术问题。同时,在普通印刷纸上引入铅笔绘图方法有助于廉价且简单地制造石墨IDE。基于上述优点,MWCNTs@COF NiP-Ph呼吸传感器具有检测范围宽(1-500 ppm)、检测限低(30 ppb)、对甲苯具有可接受的灵活性以及快速响应/恢复时间(32秒/116 秒)。这些进步有助于将呼吸传感器集成到外科口罩和衣服中,以最小的尺寸和重量实现最大的功能。 此外,通过原位 FTIR 光谱研究了 COF NiP-Ph有效检测甲苯的主要内部机制,从而直接阐明了氧气的化学吸附相互作用调节了耗尽层,导致暴露于目标气体时传感器电阻发生变化。这一令人鼓舞的结果揭示了采用纸张传感系统作为绿色电子产品中可穿戴平台的可行性。
更新日期:2024-08-26
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