基于单壁碳纳米管的化学感应平台

IF 15.6 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Journal of the American Chemical Society Pub Date : 2024-11-20 Epub Date: 2024-11-05 DOI:10.1021/jacs.4c07986
Seok Hee Han, Thomas N Pioch, Timothy M Swager
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引用次数: 0

摘要

报告了基于电化学阻抗光谱(EIS)的化学传感方法,该方法以功能化单壁碳纳米管(SWCNT)上的水性样品中的分析物为目标。与电解质接触的 SWCNT 显示出独特的阻抗谱,无法用经典等效电路模型进行分析。受离子电子混合导体电荷传输特性的启发,我们提出了一种基于传输线模型(TLM)的等效电路,通过分析碳纳米管-电解质系统的阻抗,可以追踪到所有的等效电路参数。通过将传统化学电阻或化学电容技术在技术上无法测量的多种信息结合起来,可以将对传感器做出反应的几种被分析物相互区分开来。我们在化学修饰的 SWCNT 上展示了 "化学阻抗 "概念,用于检测水溶液中的全氟烷基物质 (PFAS)。EIS 与 SWCNT 表面的氟化化学作用相结合,为每种 PFAS 提供了独特的等效电路元件变化,即 CNT 和溶液电阻的变化,以及 CNT-溶液界面电容的变化,通过这些变化,全氟辛烷磺酸、全氟辛酸、六氟环氧丙烷二聚酸和全氟丁烷磺酸可被鉴别地检测出来。新的阻抗法为化学传感开辟了新的前景,因为除了许多传统类型传感器通常测量的单一电阻或电容之外,EIS 分析还提供了额外的信息维度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Chemi-Impeditive Sensing Platform Based on Single-Walled Carbon Nanotubes.

Chemi-Impeditive Sensing Platform Based on Single-Walled Carbon Nanotubes.

Chemical sensing methodology based on electrochemical impedance spectroscopy (EIS) targeting analytes in aqueous samples on functionalized single-walled carbon nanotube (SWCNT) is reported. The SWCNT in contact with electrolyte shows unique impedance spectra that cannot be analyzed with classical equivalent circuit models. Inspired by the charge transport property of mixed ionic-electronic conductors, we propose an equivalent circuit based on transmission line model (TLM), by which the impedance of the CNT-electrolyte system can be analyzed to track down all the equivalent circuit parameters. By combining multiple pieces of information, which are technically immeasurable with conventional chemiresistive or chemicapacitive techniques, several analyte species responding to the sensor can be differentiated from each other. We demonstrate the "chemi-impeditive" concept on chemically modified SWCNTs for detecting perfluoroalkyl substances (PFAS) in aqueous solutions. The EIS coupled with a fluorination chemistry on SWCNT surface provides unique changes in equivalent circuit components for each PFAS, i.e., changes in CNT and solution resistances, as well as interfacial CNT-solution capacitance, through which perfluorooctanesulfonic acid, perfluorooctanoic acid, hexafluoropropylene oxide dimer acid, and perfluorobutanesulfonic acid are detected in a discriminative manner. The new impedimetric method opens up new vistas in chemical sensing in that the EIS analysis provides an additional dimension of information beyond the single resistance or capacitance typically measured by many conventional types of sensors.

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来源期刊
CiteScore
24.40
自引率
6.00%
发文量
2398
审稿时长
1.6 months
期刊介绍: The flagship journal of the American Chemical Society, known as the Journal of the American Chemical Society (JACS), has been a prestigious publication since its establishment in 1879. It holds a preeminent position in the field of chemistry and related interdisciplinary sciences. JACS is committed to disseminating cutting-edge research papers, covering a wide range of topics, and encompasses approximately 19,000 pages of Articles, Communications, and Perspectives annually. With a weekly publication frequency, JACS plays a vital role in advancing the field of chemistry by providing essential research.
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