Surface micromachining of polydimethylsiloxane for microfluidics applications
Staci Hill, Weiyi Qian1, Weiqiang Chen
1Department of Mechanical and Aerospace Engineering, New York University , Brooklyn, New York 11201, USA.
Biomicrofluidics
|November 1, 2016
Summary
This study presents a novel method for precisely micromachining polydimethylsiloxane (PDMS) surfaces for microfluidics. The technique combines photolithography and reactive-ion etching (RIE), enabling high-resolution features for advanced microfluidic devices.
Area of Science:
- Materials Science
- Microfluidics
- Surface Engineering
Background:
- Polydimethylsiloxane (PDMS) is widely used in microfluidics.
- Precise, large-scale surface micromachining of PDMS is challenging.
- This limits the development of high-resolution microfluidic structures.
Purpose of the Study:
- To develop a simple and effective method for PDMS surface micromachining.
- To enable high-resolution feature fabrication on PDMS.
- To explore the compatibility with silicon-based micromachining.
Main Methods:
- Direct photolithography followed by reactive-ion etching (RIE).
- Oxygen plasma treatment to enhance photoresist adhesion on PDMS.
- Systematic characterization of RIE parameters (pressure, RF power, gas composition) for PDMS etching.
- Comparison of different RIE systems (ICP vs. CCP, with/without bias power).
Main Results:
- Achieved precise surface patterning of PDMS.
- Identified optimal RIE parameters for PDMS etch rate and selectivity.
- Demonstrated the effectiveness of oxygen plasma pre-treatment for improved photolithography.
- Evaluated PDMS etching performance across different RIE configurations.
Conclusions:
- The developed RIE-based technique enables high-resolution PDMS micromachining.
- This method is compatible with conventional silicon micromachining.
- Opens opportunities for creating novel hybrid microfluidic devices with enhanced functionalities.
