Chip-on-foil devices for DNA analysis based on inkjet-printed silver electrodes

Area of Science:

• Materials Science
• Biotechnology
• Analytical Chemistry

Background:

• Rapid, on-site pathogen diagnosis is crucial for public health.
• Low-cost, disposable chip-based devices are highly desirable for molecular diagnostics.
• Existing methods may lack speed, portability, or cost-effectiveness.

Purpose of the Study:

• To fabricate and demonstrate the efficacy of inkjet-printed silver electrodes on polymer foils for molecular DNA analytics.
• To develop a rapid, low-cost, and robust chip-on-foil device for nucleic acid-based pathogen detection.

Main Methods:

• Inkjet printing of silver nanoparticle inks onto polypropylene substrates.
• Utilizing low-temperature thermal and argon plasma sintering for electrode fabrication (≤100 °C).
• Immobilizing capture DNA, hybridizing with biotin-labeled target DNA, and inducing silver nanoparticle deposition for signal amplification.

Main Results:

• Successfully fabricated conductive silver electrodes on polymer foils using substrate-preserving sintering techniques.
• Achieved sufficient electrical conductance at low processing temperatures.
• Demonstrated a proof-of-principle for nucleic acid detection via electrical conductance and optical gray value analysis.
• Validated the chip-on-foil devices for pathogen detection.

Conclusions:

• Inkjet-printed silver electrodes on polymer foils offer a viable platform for disposable, low-cost diagnostic chips.
• The developed method enables rapid, simple, and robust on-site pathogen detection using nucleic acid analysis.
• This technology has significant potential for point-of-care diagnostics and molecular analytics.