Comb interdigitated arrays (IDA) electrodes for more rapid and sensitive bead-based immunoassay

Kim, Sang Kyung; Thomas, Jennifer H.; Hesketh, Peter J.; Liu, Changming; Halsall, Brian; Heineman, William R.

doi:10.1109/memsys.2003.1189779

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…To realize highly sensitive electrochemical sensors, the increment of the surface area of the metal electrodes is one of the key issues. To increase the surface area, interdigitated array electrodes were designed and fabricated [1][2][3][4]. High aspect ratio structures are also effective for achieving a large surface area.…”

Section: Introductionmentioning

confidence: 99%

Interdigitated array 3D micromesh electrodes for electrochemical sensors

Sato

Yoshimine

Otsuka

et al. 2007

J. Micromech. Microeng.

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This paper describes the fabrication method of an interdigitated array 3D micromesh metal structure for electrochemical sensing electrodes. The inverse-micromesh structure formed by double backside exposure of the thick positive photoresist was utilized as a mold for electroplating. Ring-shaped Au patterns laid open by overexposure of the positive photoresist were employed as a seed layer for electroplating. An electrochemical sensor with interdigitated array 3D micromesh electrodes was realized by using the combination of the double-sided Cr pattern and protecting the resist layer to achieve selective electroplating. The diameter of the inclined micropillars was about 5 µm. The height and length of the micromeshes were 20 µm and 480 µm, respectively. The gap between the micromesh electrodes was 28 µm. The number of micromesh electrodes was 68 (34 anode and 34 cathode electrodes). The performance of the interdigitated array 3D micromesh electrochemical sensor was demonstrated using the redox reaction. The current signal measured by the 3D micromesh electrodes was 7.9 times higher than that of conventional planar electrodes.

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Section: Introductionmentioning

confidence: 99%

Interdigitated array 3D micromesh electrodes for electrochemical sensors

Sato

Yoshimine

Otsuka

et al. 2007

J. Micromech. Microeng.

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Microchannel Integrated Comb-Type Electrode System for Electrochemical Detection

Park

2006

2006 5th IEEE Conference on Sensors

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This paper describes a microchannel integrated comb-type electrode with teeth to induce serpentine flow. The configuration has led to obviate the step of assembling a microchannel because the gap between the positive and negative working electrodes actually forms a channel. Moreover, interdigitated tooth structure on the walls at each side of the channel causes turbulent flow effect in the sample flow. This behavior promotes oxidation-reduction reactions which enhances the sensitivity of the electrodes. We developed gold-coated nickel electrodes by electroless gold plating after nickel electroplating. The microchannel was 50 pm in width, 30 pm in height, and 1.5 mm in length. The PDMS plate was bonded on the diced devices by plasma treatment to set a flow system. The mold was made on the same wafer to have the same height with the electrodes. Forty-micrometer tooth electrode showed about twice enhanced efficiency over 10 pmtooth electrode.I.

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Comb interdigitated arrays (IDA) electrodes for more rapid and sensitive bead-based immunoassay

Cited by 2 publications

References 4 publications

Interdigitated array 3D micromesh electrodes for electrochemical sensors

Interdigitated array 3D micromesh electrodes for electrochemical sensors

Microchannel Integrated Comb-Type Electrode System for Electrochemical Detection

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