Binding Conductive Ink Initiatively and Strongly: Transparent and Thermally Stable Cellulose Nanopaper as a Promising...

Area of Science:

• Materials Science
• Nanotechnology
• Flexible Electronics

Background:

• Substrates are critical for flexible electronics performance.
• Current substrates often exhibit poor bonding with conductive inks, requiring additional binders.
• Developing substrates with inherent strong substrate-ink adhesion is essential.

Purpose of the Study:

• To present a novel cellulose nanopaper substrate for enhanced bonding with silver nanoparticle ink.
• To investigate the substrate's properties and its impact on conductive ink performance.
• To enable binder-free printing of conductive inks for flexible electronics.

Main Methods:

• Fabrication of a novel cellulose nanopaper substrate using thiol-modified nanofibrillated cellulose.
• Characterization of the substrate's optical properties, surface roughness, and thermal stability.
• Evaluation of substrate-ink bonding strength and conductivity of printed silver nanoparticle ink after mechanical stress.

Main Results:

• The developed cellulose nanopaper exhibits excellent optical properties (~85% at 550 nm), ultra-small surface roughness (3.47 nm), and high thermal stability (up to 90 °C).
• The substrate demonstrates inherent attraction and firm binding of silver nanoparticles, enabling binder-free conductive ink printing.
• Achieved stable conductivity of 2 × 10^-4 Ω cm even after extensive peeling and bending, indicating strong substrate-ink adhesion.

Conclusions:

• The novel thiol-modified cellulose nanopaper substrate significantly improves bonding with silver nanoparticle ink.
• This substrate facilitates the fabrication of high-performance flexible electronics with enhanced durability and conductivity.
• The findings open new avenues for developing advanced flexible electronic devices using innovative nanopaper substrates.