Adsorption of redox-active molecules on platinum and boron doped diamond electrodes in nanofluidic electrochemical sensors

Bommer, Jouri and Ruiter, Mark de (2012) Adsorption of redox-active molecules on platinum and boron doped diamond electrodes in nanofluidic electrochemical sensors.

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Abstract:Sensors are important to detect low concentrations or even single molecules of chemicals in a solution. One way to do such detection is by using an electrochemical sensor, especially in the nanofluidic regime. A nanofluidic electrochemical device used for these measurements, contains two electrodes separated by a few nanometers. The electrochemically active molecules undergo repeated oxidation and reduction (redox cycling) between the electrodes in the cell if the electrodes are applied with appropriate potentials. A limiting factor for the detection in these devices is the adsorption of molecules on the surface of the electrodes, because this reduces the faradaic current. In this project we investigate a way to minimize the adsorption in a nanofluidic electrochemical device. Boron doped diamond is a material on which little adsorption occurs macroscopically. Therefore the used devices contained two electrodes made of either platinum or diamond or a combination of diamond and platinum. The main goal is to compare two electrode materials i.e. boron doped diamond and platinum and to find which on which material the least adsorption occurs in nanofluidic electrochemical devices. To measure the adsorption we use electrochemical spectroscopic methods. Our main result is that the boron doped diamond electrodes adsorb less compared to the electrodes made of platinum.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics BSc (56962)
Link to this item:http://purl.utwente.nl/essays/62087
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