Highly Sensitive Capacitive Gas Sensing at Ionic Liquid-Electrode Interfaces.
Highly Sensitive Capacitive Gas Sensing at Ionic Liquid-Electrode Interfaces.
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DOI：
10.1021/acs.analchem.5b04677
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发表时间：
2016-01
影响因子：
7.4
通讯作者：
Zhe Wang;Min Guo;Xiaoyi Mu;Soumyo Sen;Thomas I. Insley;A. Mason;P. Král;Xiangqun Zeng
中科院分区：
文献类型：
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作者：
Zhe Wang;Min Guo;Xiaoyi Mu;Soumyo Sen;Thomas I. Insley;A. Mason;P. Král;Xiangqun Zeng
我们开发了一种超敏感的气体检测方法，基于在存在和不存在吸附的气体分子的情况下，电动离子液体（IL）电极界面的差分电容的测量值。这对于每种类型的气体都是独特的，其放大器与气体分子的浓度有关。从其他干扰物种（即CO2，O2，NO2，NO，SO2，H2O，H2和Cyclohexane）中的PPB水平少于1.8％的PPB水平检测，该研究以与SO2相同的浓度进行了测试）。使用可调电气的IL - 电极界面，以选择分辨率为0.1Å的分子的选择性敏感性。
We have developed an ultrasensitive gas-detection method based on the measurement of a differential capacitance of electrified ionic liquid (IL) electrode interfaces in the presence and absence of adsorbed gas molecules. The observed change of differential capacitance has a local maximum at a certain potential that is unique for each type of gas, and its amplitude is related to the concentration of the gas molecules. We establish and validate this gas-sensing method by characterizing SO2 detection at ppb levels with less than 1.8% signal from other interfering species (i.e., CO2, O2, NO2, NO, SO2, H2O, H2, and cyclohexane, tested at the same concentration as SO2). This study opens a new avenue of utilizing tunable electrified IL-electrode interfaces for selective sensing of molecules with a kinetic size resolution of 0.1 Å.