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Sensors 2017, 17(9), 2141;

Using Impedance Measurements to Characterize Surface Modified with Gold Nanoparticles

Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
National Institute for Nanotechnology, National Research Council, Edmonton, AB T6G 2M9, Canada
Department of Biomedical Engineering, University of Alberta, Edmonton, AB T6G 2V2, Canada
Author to whom correspondence should be addressed.
Received: 11 July 2017 / Revised: 1 September 2017 / Accepted: 15 September 2017 / Published: 18 September 2017
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Canada 2017)
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With the increased practice of preventative healthcare to help reduce costs worldwide, sensor technology improvement is vital to patient care. Point-of-care (POC) diagnostics can reduce time and lower labor in testing, and can effectively avoid transporting costs because of portable designs. Label-free detection allows for greater versatility in the detection of biological molecules. Here, we describe the use of an impedance-based POC biosensor that can detect changes in the surface modification of a micro-fabricated chip using impedance spectroscopy. Gold nanoparticles (GNPs) have been employed to evaluate the sensing ability of our new chip using impedance measurements. Furthermore, we used impedance measurements to monitor surface functionalization progress on the sensor’s interdigitated electrodes (IDEs). Electrodes made from aluminum and gold were employed and the results were analyzed to compare the impact of electrode material. GNPs coated with mercaptoundecanoic acid were also used as a model of biomolecules to greatly enhance chemical affinity to the silicon substrate. The portable sensor can be used as an alternative technology to ELISA (enzyme-linked immunosorbent assays) and polymerase chain reaction (PCR)-based techniques. This system has advantages over PCR and ELISA both in the amount of time required for testing and the ease of use of our sensor. With other techniques, larger, expensive equipment must be utilized in a lab environment, and procedures have to be carried out by trained professionals. The simplicity of our sensor system can lead to an automated and portable sensing system. View Full-Text
Keywords: impedance-based biosensor; gold nanoparticles; point-of-care biosensor; impedance measurements; surface characterization impedance-based biosensor; gold nanoparticles; point-of-care biosensor; impedance measurements; surface characterization

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MacKay, S.; Abdelrasoul, G.N.; Tamura, M.; Lin, D.; Yan, Z.; Chen, J. Using Impedance Measurements to Characterize Surface Modified with Gold Nanoparticles. Sensors 2017, 17, 2141.

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