Interface-exfoliated graphene-based conductive screen-printing inks: low-loading, low-cost, and additive-free | JoVE Visualize

Interface-exfoliated graphene-based conductive screen-printing inks: low-loading, low-cost, and additive-free

Feiyang Chen¹, Deepthi Varghese¹, Sean T McDermott²

¹Chemistry Department, University of Connecticut, Storrs, 06269, USA.

Scientific Reports|October 23, 2020

View abstract on PubMed

Summary

Researchers developed an inexpensive, eco-friendly graphene ink for paper diagnostics. This novel conductive ink uses graphite and water, avoiding high temperatures and harsh chemicals for easy application on paper.

Area of Science:

Materials Science
Nanotechnology
Biomedical Engineering

Background:

Paper diagnostics are increasingly important due to their affordability and ease of use.
Current conductive inks for next-generation diagnostics face challenges like high cost, high sintering temperatures, and harsh processing conditions.

Purpose of the Study:

To develop an effective, inexpensive, and environmentally friendly graphene ink suitable for screen printing on paper substrates.
To overcome the limitations of existing conductive ink technologies for paper-based diagnostic devices.

Main Methods:

Utilized an interfacial trapping method for spontaneous graphite exfoliation into graphene.
Formulated a viscous graphene-stabilized water-in-oil emulsion ink using pristine graphite, water, and non-toxic alkanes.
Investigated drying at 90°C or brief microwaving to enhance conductivity.

Main Results:

Successfully created an inexpensive and environmentally friendly graphene ink from graphite and water.
The ink formulation requires minimal processing time (40s shaking) and avoids high sintering temperatures.
Achieved a sheet resistance of approximately 600 Ω/sq at a thickness below 6 µm, with stabilization using as little as 1 wt% graphite.

Conclusions:

The developed graphene ink offers a cost-effective and sustainable solution for manufacturing paper-based diagnostic devices.
The ink's properties are suitable for screen printing and can be optimized for conductivity through simple drying or microwaving.
This approach addresses key challenges in conductive ink technology for accessible and advanced diagnostics.