Fast and Efficient Fabrication of Functional Electronic Devices through Grayscale Digital Light Processing 3D...

Area of Science:

• Materials Science
• Polymer Chemistry
• Additive Manufacturing

Background:

• Fabricating polymeric composites for electronics is challenging and expensive.
• Digital Light Processing (DLP) 3D printing offers a promising approach for intricate structures.

Purpose of the Study:

• To develop a cost-effective and rapid method for producing polymeric composites with spatially controlled electrical conductivity using 3D printing.
• To demonstrate the fabrication of materials with conductivity differences exceeding three orders of magnitude within a single part.

Main Methods:

• Utilized grayscale DLP (g-DLP) 3D printing with a single vat and single cure process.
• Engineered resin formulations containing lithium ions.
• Manipulated UV light intensity during the curing process to control conductivity.

Main Results:

• Achieved conductivity variations exceeding three orders of magnitude in different sections of the printed polymer.
• Demonstrated that higher UV light intensity curing resulted in higher electrical resistance.
• Showcased that partially cured regions with uncured monomers facilitated ion mobility and higher conductivity.

Conclusions:

• Grayscale DLP 3D printing enables precise control over material conductivity through light intensity manipulation and resin design.
• This technique facilitates the low-cost, rapid production of complex electronic circuits and sensors.
• Offers an innovative pathway for fabricating functional electronic devices with tailored conductivity.