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Triboelectric Spectroscopy for In Situ Detection of Gas Molecules in Liquid
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AI
DOI：10.1021/acsnano.6c02420.png)
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Abstract
En 中文
The rapid and accurate identification of gas molecules in liquids is of critical importance for environmental science, biomedical research, and industrial process control. However, traditional techniques, such as gas chromatography–mass spectrometry, electrochemical sensors, and optical methods, often require complex sample pretreatment, can detect only a single gas, and frequently depend on specific indicators, limiting their real-time monitoring capability and the general applicability in gas detection. Here, we extend the concept of triboelectric spectroscopy (TES) to the in situ chemical analysis of gas molecules in liquids. This approach relies on the unique charge transfer patterns generated when a liquid droplet containing a specific dissolved gas molecules slides across an insulating surface. Based on TES, we have successfully identified six types of common gas molecules, including CO2, NH3, CH4, Ar, N2, and O2, with an identification accuracy of 96% and a detection limit of 0.02 mmol L–1. Furthermore, we demonstrate the practical utility of TES in complex biological matrices by efficiently detecting CO2 in plasma with a detection limit in the millimolar range. The measured TES peak charge transfer and total charge transfer exhibited strong linear correlations with CO2 concentration, with R2 values of 0.923 and 0.996, respectively, confirming a strong linear dependence and reliable predictability.
Keywords:
Charge transfer
Inorganic carbon compounds
Liquids
Molecules
Oxides
contact electrification
triboelectric nanogenerator
liquid−solid interface
charge transfer
self-powered sensor