Novel Integration of Conductive-Ink Circuitry with a Paper-Based Microfluidic Battery as an All-Printed Sensing Platform

<p>The addition of powered components for active assays into paper-based analytical devices opens new opportunities for medical and environmental analysis in resource-limited applications. Current battery designs within such devices have yet to adopt a ubiquitous circuitry material, necessitating investigation into printed circuitry for scalable platforms. In this study, a microfluidic battery was mated with silver-nanoparticle conductive ink to prototype an all-printed sensing platform. A multi-layer, two-cell device was fabricated, generating 200 μA of direct electrical current at 2.5 V sustained for 16 minutes with a power loss of less than 0.1% through the printed circuitry. Printed circuitry traces exhibited resistivity of 75 to 211 10^-5 Ω m. Resistance of the printed traces increased upwards of 200% depending on fold angle and directionality. X-ray diffraction confirmed the presence of face-centered cubic silver after sintering printed traces for 30 minutes at 150°C in air. A conductivity threshold was mapped and an ink concentration of 0.636 μL mm^-3 was identified as the lower limit for optimal electrical performance.</p>

Name thesis:degree_name

MS in Engineering - Materials Engineering

Discipline thesis:degree_discipline

Materials Engineering

Year dc:date.available

2016

Author dc:creator

• Kripalani, Rishi A.

Contributors dc:contributor

• Linda Vanasupa

• silver nanoparticle ink
• microfluidic battery
• percolation threshold
• paperbased analytical device
• μPAD
• printed circuitry
• x-ray diffraction
• Materials Science and Engineering

Identifier

10.15368/theses.2016.161

OAI identifier oai:identifier

oai:digitalcommons.calpoly.edu:theses-2887