High-Quality Microprintable and Stretchable Conductors for High-Performance 5G Wireless Communication

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• The rise of 5G wireless and Internet of Things (IoT) necessitates advanced flexible and stretchable printed circuit boards (PCBs).
• Existing flexible PCBs face challenges in maintaining signal integrity and electrical connectivity for high-performance applications.

Purpose of the Study:

• To develop a novel silver nanoparticle (AgNP)/silver nanowire (AgNW) hybrid conductor for fabricating high-performance flexible and stretchable PCBs.
• To utilize high-quality microprinting technology for creating reliable electronic components for 5G wireless communication.

Main Methods:

• A simple, low-cost reverse offset printing technique was adapted for fabricating AgNP/AgNW micropatterns.
• Intense pulsed light irradiation was used for annealing the micropatterns.
• Fabricated micropatterns were tested for electrical resistivity, stretchability, and application in 5G antennas and wearable sensors.

Main Results:

• AgNP/AgNW micropatterns demonstrated excellent pattern quality, including fine line spacing and clear edge definition.
• The annealed micropatterns achieved outstanding electrical resistivity (15.7 μΩ cm) and withstood up to 90% strain with minimal resistance change.
• Demonstrated practical applications include 5G communication antennas with excellent C-band signal processing and wearable sensors capable of real-time finger movement detection.

Conclusions:

• The developed AgNP/AgNW hybrid conductor and microprinting technology are suitable for high-performance flexible and stretchable PCBs.
• This technology enables robust and reliable electronic components for advanced 5G wireless systems and sensitive wearable devices.