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Evaluation of Microelectrode Arrays for Amperometric Detection by Scanning Electrochemical Microscopy
Author(s) -
Wittstock Gunther,
Gründig Bernd,
Strehlitz Beate,
Zimmer Klaus
Publication year - 1998
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199807)10:8<526::aid-elan526>3.0.co;2-7
Subject(s) - ultramicroelectrode , microelectrode , electrode , amperometry , scanning electrochemical microscopy , materials science , electrode array , multielectrode array , optoelectronics , microscopy , electrochemistry , nanotechnology , analytical chemistry (journal) , optics , chemistry , cyclic voltammetry , physics , chromatography
Ultramicroelectrode arrays have been manufactured by a combination of screen printing and laser ablation with different sizes of the active electrode areas and different interelectrode spacings. The participation of each array element in the heterogeneous redox reaction can be checked with the help of scanning electrochemical microscopy (SECM). Because the active electrode area is recessed compared to the insulating cover layer of the sensor, a loss in sensitivity is found on such arrays compared to an electrode array of the same geometry which is in plane with its insulating surrounding. Consequences for the application of such electrode arrays as the basis of sensors in hand‐held devices for in‐field testing are discussed.