Zhang Jinyang, Wang Xuejiao, Zhang Long, Lin Shiquan, Ciampi Simone, Wang Zhong Lin
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, P. R. China.
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
J Am Chem Soc. 2024 Mar 6;146(9):6125-6133. doi: 10.1021/jacs.3c13674. Epub 2024 Feb 7.
Chemical analysis of ions and small organic molecules in liquid samples is crucial for applications in chemistry, biology, environmental sciences, and health monitoring. Mainstream electrochemical and chromatographic techniques often suffer from complex and lengthy sample preparation and testing procedures and require either bulky or expensive instrumentation. Here, we combine triboelectrification and charge transfer on the surface of electrical insulators to demonstrate the concept of triboelectric spectroscopy (TES) for chemical analysis. As a drop of the liquid sample slides along an insulating reclined plane, the local triboelectrification of the surface is recorded, and the charge pattern along the sample trajectory is used to build a fingerprinting of the charge transfer spectroscopy. Chemical information extracted from the charge transfer pattern enables a new nondestructive and ultrafast (<1 s) tool for chemical analysis. TES profiles are unique, and through an automated identification, it is possible to match against standard and hence detect over 30 types of common salts, acids, bases and organic molecules. The qualitative and quantitative accuracies of the TES methodology is close to 93%, and the detection limit is as low as ppb levels. Instruments for TES chemical analysis are portable and can be further miniaturized, opening a path to in situ and rapid chemical detection relying on inexpensive, portable low-tech instrumentation.
对液体样品中的离子和小有机分子进行化学分析，对于化学、生物学、环境科学及健康监测等领域的应用至关重要。主流的电化学和色谱技术往往存在复杂且冗长的样品制备和测试程序，并且需要大型或昂贵的仪器设备。在此，我们将电绝缘体表面的摩擦起电和电荷转移相结合，以演示用于化学分析的摩擦电光谱法（TES）概念。当一滴液体样品沿绝缘倾斜平面滑动时，记录表面的局部摩擦起电情况，并利用沿样品轨迹的电荷模式构建电荷转移光谱的指纹图谱。从电荷转移模式中提取的化学信息为化学分析提供了一种新型无损且超快速（<1秒）的工具。TES谱图具有独特性，通过自动识别，可以与标准图谱进行匹配，从而检测出30多种常见的盐、酸、碱和有机分子。TES方法的定性和定量准确率接近93%，检测限低至ppb级别。用于TES化学分析的仪器便于携带，并且可以进一步小型化，为依靠廉价、便携的低技术仪器进行现场快速化学检测开辟了一条道路。
