Nanoscale engineering to control mass transfer on carbon based electrodes

Thumbnail Image

Files

master_Ferrer_Pascual_Laura_2023.pdf (5.68 MB)

URL

Journal Title

Journal ISSN

Volume Title

Sähkötekniikan korkeakoulu | Master's thesis
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.

Authors

Date

2023-01-16

Department

Major/Subject

Biosensing and Bioelectronics

Mcode

ELEC3045

Degree programme

LST - Master's Programme in Life Science Technologies (TS2013)

Language

en

Pages

64

Series

Abstract

Carbon nanomaterials present great potential in electrochemical applications due to their large surface area, wide potential windows, high sensitivity, and large electrical conductivity. Carbon nanomaterials produce an entrapment of the analyte forming a thin layer of solution at the electrode surface. This thin-layer electrochemistry is reflected as a decrease in redox peak separation (∆E_p) and it is only observed at a specific ratio of the diffusion layer thickness to the dimensions of the nanostructures. The effect of the carbon nanomaterial on thin-layer electrochemistry is dependent on the physicochemical properties of the nanomaterial such as length, diameter, and population density. Therefore, an accurate determination of the effect of geometry or chemistry of carbon nanomaterial on thin-layer electrochemistry is needed to optimize the electrodes for their later use in biosensing. The aim of this master thesis was (i) to characterize the thin film electrochemical behavior and (ii) the kinetics of carbon nanofiber electrodes with similar chemical properties and controllable variable geometrical characteristics, i.e., variable fiber length and population density. To do so, six types of electrodes were studied with different carbon nanofiber length and substrate material. Differences in fibre length resulted in differences in electrode reactive surface area which affected some of the electrode’s electrical properties such as the pseudocapacitance or heterogeneous electron rate constant.

Description

Supervisor

Laurila, Tomi

Thesis advisor

Laurila, Tomi

Keywords

nanomaterial, nanofiber, electrochemistry, biosensor, thin-layer diffusion

Other note

Citation

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202301221474

Collections

[dipl] Sähkötekniikan korkeakoulu / ELEC