Microfabrication of nanoporous gold patterns for cell-material interaction studies

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Nanostructured materials, particularly nanoporous gold (np-Au), offer enhanced surface area, conductivity, and catalytic activity.
• Current research often uses macro-scale np-Au, limiting its application in miniaturized systems like biomedical devices.
• There is a need for methods to integrate np-Au into microscale platforms.

Purpose of the Study:

• To develop and demonstrate methods for micropatterning nanoporous gold (np-Au) thin films on rigid substrates.
• To enable the integration of np-Au into microsystems for advanced applications.
• To evaluate the interaction of micropatterned np-Au with mammalian cells for biosensor development.

Main Methods:

• Two methods for micropatterning np-Au thin films: manual stencil masks (millimeter-scale) and lift-off photolithography (sub-millimeter-scale).
• Sputter-deposition of np-Au thin films, compatible with standard microfabrication techniques.
• Cell culture, immunostaining, and image processing to quantify np-Au and mammalian cell interactions.

Main Results:

• Successful micropatterning of np-Au thin films using both stencil masks and photolithography.
• Demonstrated compatibility of np-Au thin films with microfabrication processes.
• Quantified np-Au interaction with mammalian cells, a key parameter for biosensor performance.

Conclusions:

• The presented techniques facilitate the integration of np-Au into various length-scale platforms and applications.
• Micropatterned np-Au is suitable for electrically-addressable biosensor platforms, benefiting from its surface area and conductivity.
• These advancements are expected to drive the use of np-Au in biosensors, energy storage, and catalysis.