A new ATR-IR microreactor to study electric field-driven processes

•A silicon-based microreactor to study E-field-driven processes by in situ ATR-IR.•In situ IR of gaseous CO2 under an applied E-field, and electrochemistry involving NH4+ in solution.•Discussion of ATR artifacts (phonons, IR interference) caused by the E-field, which are not related to the chemical...

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Veröffentlicht in:Sensors and actuators. B, Chemical Chemical, 2015-12, Vol.220, p.13-21
Hauptverfasser: Susarrey-Arce, A., Tiggelaar, R.M., Morassutto, M., Geerlings, J., Sanders, R.G.P., Geerdink, B., Schlautmann, S., Lefferts, L., van Houselt, A., Gardeniers, J.G.E.
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Sprache:eng
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Zusammenfassung:•A silicon-based microreactor to study E-field-driven processes by in situ ATR-IR.•In situ IR of gaseous CO2 under an applied E-field, and electrochemistry involving NH4+ in solution.•Discussion of ATR artifacts (phonons, IR interference) caused by the E-field, which are not related to the chemical species and their reactions. A silicon-based microreactor with a structure that allows in situ characterization by Attenuated Total Internal Reflection Infrared spectroscopy (ATR-IR) of processes driven by an external electric field (E-field) is presented. The microreactor is characterized electrically and spectroscopically. The effects of applying an electric field over a gas or liquid medium in the flow channel of the microreactor are carefully investigated and electrical, mechanical, and optical phenomena which may affect the interpretation of ATR-IR spectroscopic data are discussed. Among these phenomena are heating as a result of the E-field-driven current and the associated phonon generation in the silicon crystal. Experimental IR results under the application of an electrical field are shown for CO2 gas and ammonium ions in aqueous solution. The ability to follow liquid-phase reactions in situ is demonstrated.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2015.05.025