A Method to Pattern Silver Nanowires Directly on Wafer-Scale PDMS Substrate and Its Applications

Area of Science:

• Materials Science
• Nanotechnology
• Flexible Electronics

Background:

• Developing reliable methods for patterning conductive nanomaterials is crucial for advancing flexible electronics.
• Poly(p-xylylene) (parylene) stencils offer precise patterning capabilities for microscale applications.

Purpose of the Study:

• To present a novel fabrication technique for creating microsized silver nanowire (AgNW) patterns on poly dimethylsiloxane (PDMS) substrates.
• To demonstrate the electrical and mechanical performance of these AgNW patterns under strain.
• To explore the potential applications of these patterned AgNWs in epidermal and tactile sensors.

Main Methods:

• Utilized a parylene stencil technique for wafer-scale patterning of AgNWs on PDMS substrates.
• Fabricated various AgNW patterns including lines, texts, and symbols with dimensions from tens to hundreds of micrometers.
• Investigated the electrical performance and mechanical properties (gauge factor, stretchability) of patterned AgNW electrodes under uniaxial strain.

Main Results:

• Achieved reliable wafer-scale fabrication of diverse AgNW patterns on PDMS.
• Demonstrated tunable gauge factors (0.5-55.2) and stretchability (4.7-55.7%) for AgNW electrodes.
• Successfully fabricated functional strain sensors for detecting physiological signals and tactile sensors with high sensitivity.

Conclusions:

• The developed parylene stencil technique provides a robust method for AgNW patterning on PDMS.
• The fabricated AgNW patterns exhibit promising performance for flexible electronic applications, including wearable sensors.
• This technique holds potential for the mass production of advanced flexible electronic devices.