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Gold nanogap interdigitated arrays for redox cycling amplified dopamine detection

  • Here we present the highly sensitive detection of dopamine using gold nanogap IDAs with redox-cycling amplification. Through the combination with a facile electrochemical activation and a chronoamperometric multistep protocol fouling of the gold electrode surface can be prevented and a sensitivity of 14 nA μM -1 with excellent linearity up to 10 μM is achieved. The low-cost and reproducible wafer level fabrication process of the nanogap IDAs plays a key role. Electrode and substrate materials can be nearly arbitrarily chosen. Also the gap sizes could be adjusted down to sub-100 nm dimensions with this versatile approach, allowing for very high signal amplification. In comparison to the current gold standard, fastscan cyclic voltammetry (FSCV) with carbon fiber microelectrodes (CFMEs), which suffers from high background currents, no elaborate data processing and high-end electronic equipment is needed. Employing our flexible, easy and inexpensive method, DA monitoring with a short acquisition period and a detection limit less than 200 nM is successfully demonstrated.

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Metadaten
Author:Elmar Laubender, Volha Matylitskaya, Elisabeth Kostal, Stephan Kasemann, Gerald A. Urban, Stefan Partel, Can Dincer
DOI:https://doi.org/10.1109/TRANSDUCERS.2019.8808356
ISBN:978-1-7281-2007-2
Parent Title (English):2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII). 23-27 June. Berlin. Germany
Publisher:IEEE
Place of publication:Danvers, MA
Document Type:Conference Proceeding
Language:English
Year of publication:2019
Release Date:2020/01/16
Tag:Electric potential; Electrodes; Fingers; Gold; Monitoring; Protocols; Sensitivity
First Page:1017
Last Page:1020
Organisationseinheit:Forschung / Forschungszentrum Mikrotechnik
DDC classes:600 Technik, Medizin, angewandte Wissenschaften
Peer review:wiss. Beitrag, peer-reviewed
Publicationlist:Kasemann, Stephan
Matylitskaya, Volha
Partel, Stefan
Kostal, Elisabeth
Licence (German):License LogoUrhG - The Austrian Copyright Act applies - Es gilt das österr. Urheberrechtsgesetz