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Highly Sensitive Capacitive Gas Sensing at Ionic Liquid-Electrode Interfaces
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DOI：10.1021/acs.analchem.5b04677.png)
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Abstract
En 中文
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, O-2, NO2, NO, SO2, H2O, H-2 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 angstrom.
Keywords:
DOUBLE-LAYER CAPACITANCE
DIFFERENTIAL CAPACITANCE
PHASE-TRANSITIONS
SURFACE-STRUCTURE
CO2 CAPTURE
AFM
STM
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