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Focused Ion Beam Lithography to Etch Nano-architectures into Microelectrodes
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A comparative study on fabrication techniques for on-chip microelectrodes.

Yuksel Temiz1, Anna Ferretti, Yusuf Leblebici

  • 1Ecole Polytechnique Federale de Lausanne (EPFL), Laboratory of Life Sciences Electronics (CLSE), EPFL STI IBI CLSE Station 17, Lausanne, Switzerland.

Lab on a Chip
|October 9, 2012
PubMed
Summary
This summary is machine-generated.

This study evaluated microelectrode passivation for lab-on-a-chip devices. Parylene C demonstrated superior robustness and reliability for electrochemical measurements compared to other techniques like SiO(2) and SU-8.

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Area of Science:

  • Materials Science and Engineering
  • Microfabrication Technologies
  • Electrochemical Biosensors

Background:

  • Microelectrode fabrication is crucial for lab-on-a-chip (LOC) devices.
  • Robust surface insulation is essential for reliable performance in LOC applications.
  • Evaluating different passivation materials is key to advancing microelectrode technology.

Purpose of the Study:

  • To experimentally compare the robustness of various microelectrode passivation techniques.
  • To assess the suitability of different insulation materials for typical lab-on-a-chip working conditions.
  • To identify the most reliable passivation for electrochemical measurements.

Main Methods:

  • Fabrication of platinum (Pt) microelectrodes on Si/SiO(2) substrates.
  • Application and patterning of five passivation layers: sputtered SiO(2), low-pressure chemical vapor deposition (LPCVD) low-temperature oxide (LTO), Parylene C, SU-8, and dry-film resist.
  • Hydrolysis testing to evaluate adhesion and quality.
  • Impedance spectroscopy after ethanol incubation and self-assembled monolayer (SAM) formation.
  • Electrochemical experiments using square-wave voltammetry with ferrocene-functionalized alkanethiols.

Main Results:

  • Sputtered SiO(2) and dry-film resist showed significant delamination in hydrolysis tests.
  • LTO exhibited minor defects, while Parylene C and SU-8 demonstrated good adhesion.
  • All passivations maintained consistent impedance after ethanol incubation.
  • LTO, Parylene C, and SU-8 ensured uniform electrical behavior after SAM formation.
  • Parylene C passivation showed superior long-term stability and reproducible electrochemical label detection.

Conclusions:

  • Parylene C offers superior robustness and reliability for microelectrode passivation in LOC applications.
  • The choice of passivation layer significantly impacts electrode performance, especially after SAM formation.
  • Parylene C is highly suitable for charge-transfer-based electrochemical measurements in microfluidic devices.