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Microfabrication of Nanoporous Gold Patterns for Cell-material Interaction Studies
Published on: July 15, 2013
High-resolution direct patterning of gold nanoparticles by the microfluidic molding process
Michael T Demko1, Jim C Cheng, Albert P Pisano
1Berkeley Sensor & Actuator Center, University of California at Berkeley, Berkeley, California 94720, United States. demko@berkeley.edu
Langmuir : the ACS Journal of Surfaces and Colloids
|October 5, 2010
Summary
A new microfluidic molding technique precisely patterns gold nanoparticles on various substrates. This additive method creates dense nanoparticle features for conductive traces without etching, offering a controlled, low-temperature printing solution.
Area of Science:
- Materials Science
- Nanotechnology
- Microfluidics
Background:
- Developing precise methods for microscale patterning of nanoparticles is crucial for advanced electronics.
- Existing techniques like inkjet printing have limitations in feature density and additive control.
- Gold nanoparticles offer unique electrical and optical properties for various applications.
Purpose of the Study:
- To introduce a novel microfluidic molding process for creating microscale gold nanoparticle features.
- To demonstrate the capability of this technique on diverse substrates including polyimide, glass, and silicon.
- To achieve dense, well-controlled nanoparticle patterns suitable for conductive trace formation.
Main Methods:
- Utilized a microfluidic molding process employing permeation pumping.
- Patterned and concentrated gold nanoparticle ink within microfluidic channels in a porous polymer template.
- Applied the template in contact with target substrates (polyimide, glass, silicon).
- Sintered the patterned gold nanoparticles to form continuous conductive traces.
Main Results:
- Successfully formed microscale gold nanoparticle features on polyimide, glass, and silicon.
- Achieved dense, close-packed nanoparticle arrays due to self-concentration in microchannels.
- Demonstrated additive patterning with high structural control, comparable to inkjet printing.
- Produced continuous and conductive gold traces after nanoparticle sintering.
- Operated the process under low temperatures and pressures in an ambient environment.
Conclusions:
- The novel microfluidic molding process provides a highly controllable and additive method for patterning gold nanoparticles.
- This technique enables the fabrication of dense nanoparticle features and conductive traces on various substrates.
- The process offers an efficient, low-temperature alternative to traditional microfabrication methods for nanoparticle applications.
