Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Electrochemical microsensor with in-situ fabricated Ag/AgCl reference electrode for high-pressure microfluidics
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Elektrokemisk mikrosensor med referenselektrod av Ag/AgCl, tillverkad i mikrofluidikchip som tål höga tryck (Swedish)
Abstract [en]

Electroanalysis offers cheap and selective analysis of interesting solutions. However, one of the most common drawbacks is the accessibility for electrochemical sensing. By using high-pressure microfluidics with an integrated three-electrode system, new possibilities open for increased accessibility. Therefore, there is a need to fabricate sustainable reference surfaces into highly pressure tolerant microchannels.

In this thesis, Ag/AgCl reference surfaces were in-situ fabricated in high-pressure microfluidic chips. This was performed by electroplating Ag on thin film Pt in microchannels and then chlorinating the silver into Ag/AgCl. Electroanalysis of ferrocyanide was carried out in a microfluidic chip using one of the in-situ fabricated Ag/AgCl references. The half-wave potential showed to be around +251 mV and the electrochemical water window was measured to 1400 mV with a range between -300 mV and +1100 mV. The obtained values show to be comparable to reference data of similar experiments performed elsewhere.

For some applications of electrochemistry, a catalysis surface is beneficial. Nanoporous Pt black has proved to generate high catalytic performance in electrochemistry. Therefore, attempts have been carried out to fabricate Pt black onto Pt thin films, with the vision to succeed with such fabrication within microfluidic channels.

To summarize, this project work has showed a possibility to in-situ fabricate Ag/AgCl reference surfaces. The project has also showed how to use such surfaces as reference electrodes for electroanalysis in high-pressure microfluidic chips. Lastly, new challenges and ideas to fabricate catalysis surfaces on thin film electrodes in flow channels have been presented. By this thesis, one more step has been taken to increase the accessibility for electroanalysis.

Place, publisher, year, edition, pages
2017. , p. 45
Series
UPTEC Q, ISSN 1401-5773 ; 17015
Keywords [en]
high pressure microfluidics, electrochemical microsensor, Ag/AgCl reference electrode, Pt black
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-330913OAI: oai:DiVA.org:uu-330913DiVA, id: diva2:1147672
Educational program
Master Programme in Materials Engineering
Presentation
2017-09-01, Å13167, Lägerhyddsvägen 1, Uppsala, 14:15 (English)
Supervisors
Examiners
Available from: 2017-10-09 Created: 2017-10-06 Last updated: 2017-10-09Bibliographically approved

Open Access in DiVA

fulltext(4278 kB)134 downloads
File information
File name FULLTEXT01.pdfFile size 4278 kBChecksum SHA-512
45e80e37ae0ff68d97102462961e274cb637a4a2b52ce9f7da05270c96bdf93252d5716a7bb9a507b4edb7a9b388bf13276ae653690749130a66a9c7c3a5012d
Type fulltextMimetype application/pdf

By organisation
Microsystems Technology
Other Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 134 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 351 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf