Toward membrane-free amperometric gas sensors: a microelectrode array approach.
Room temperature ionic liquids (RTILs) have been applied to a microelectrode array and been demonstrated to form effective, membrane-free amperometric gas sensors. Determining the RTIL [P(6,6,6,14)][FAP] as the most appropriate choice for extended use, the amperometric quantification of oxygen has been demonstrated. The response of the sensor was quantified by both cyclic voltammetry and chronoamperometry. A range of O(2) contents (2-13% v/v) and RTIL layer thicknesses (from ca. 6 to 125 mum) have been investigated. The combination of microelectrode array and RTIL, as well as the absence of membrane and volatile solvent, results in an elegant, easy to calibrate gas sensor with potential utility in standard and nonstandard conditions.
Huang
Xing-Jiu
XJ
Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom.
Aldous
Leigh
L
O'Mahony
Aoife M
AM
del Campo
F Javier
FJ
Compton
Richard G
RG
D002138:Calibration; D004563:Electrochemistry / Q000379:methods*; D005740:Gases / Q000032:analysis; D052578:Ionic Liquids / Q000737:chemistry*; D008839:Microelectrodes; D010100:Oxygen / Q000032:analysis*
D005740:Gases; D052578:Ionic Liquids; D010100:Oxygen