Large-area interdigitated array microelectrodes for electrochemical sensing
نویسندگان
چکیده
Advanced photolithography developed for the semiconductor industry has been used to fabricate interdigitated microelectrode arrays that pass steady-state limiting currents of up to 230 nArmM analyte — 2.5 times more than the most sensitive interdigitated array built to date, and exhibit response times of ;5 ms. This performance results from the small interelectrode gap and the large active area of the Ž 2. device 4 mm , a combination enabled by advanced photolithography. We describe the fabrication of these arrays and the characterizaŽ .3q tion of their performance in two environments: an aqueous solution of Ru NH and a dinitrotoluene solution in acetonitrile. The 3 6 scaling of array performance parameters with device dimensions is also presented. q 2000 Elsevier Science S.A. All rights reserved.
منابع مشابه
Electrochemical Measurements with Interdigitated Array Microelectrodes
ing into widespread use for the trace determination of easily oxidizable and reducible organic and inorganic compounds, because it provides a rather easy procedure for direct and selective detection. Recently, microelectrodes have been receiving attention in this field (1,2). They offer higher sensitivity than macroelectrodes of conventional size, because an electroactive molecule can approach ...
متن کاملGlucose sensing based on interdigitated array microelectrode.
A micro glucose sensor consisting of an interdigitated array gold microelectrode was developed. The interdigitated array structure, which has 10 microns band width and 10 microns band gap, was fabricated in a small region (2.5 x 5 mm2) on a quartz substrate. Glucose oxidase was chemically fixed onto the electrode surface through self-assembled monolayer of 11-mercaptoundecanoic acid; ferrocenea...
متن کاملThe effect of channel height and electrode aspect ratio on redox cycling at carbon interdigitated array nanoelectrodes confined in a microchannel.
Redox cycling is a commonly used electrochemical sensing scheme for enhancing faradaic current signals. This effect can be improved by either optimizing electrode geometries or restricting electrochemical reactions within a limited volume. Here, we demonstrate a simple batch fabrication of 1 : 1 aspect ratio carbon interdigitated array nanoelectrodes integrated in a polydimethylsiloxane microch...
متن کاملSensing Arrays Constructed from Nanoparticle Thin Films and Interdigitated Microelectrodes
This paper describes the results of a study of a few design parameters influencing the performance of sensor arrays constructed from nanostructured thin films and interdigitated microelectrodes (IMEs). The nanostructured thin films on the IME devices were prepared from nonanedithiol (NDT) and mercaptoundecanoic acid (MUA) linked assemblies of 2-nm sized gold nanoparticles. The sensor array data...
متن کاملInfluence of droplet coverage on the electrochemical response of planar microelectrodes and potential solving strategies based on nesting concept
Recently, biosensors have been widely used for the detection of bacteria, viruses and other toxins. Electrodes, as commonly used transducers, are a vital part of electrochemical biosensors. The coverage of the droplets can change significantly based on the hydrophobicity of the microelectrode surface materials. In the present research, screen-printed interdigitated microelectrodes (SPIMs), as o...
متن کامل