Stretchable capacitor with patterned structure by microfluidic molding technology

Stretchable capacitors are vital for flexible wearables due to outstanding mechanical adaptability and electrical stability. Herein, a microfluidic route is proposed to fabricate patterned stretchable capacitive sensors with silicone rubber–based nanocomposites. A detachable microfluidic mold efficiently patterns conductive and dielectric layers. The regulation effect of (Koch curve and rhombus grid curve) structures on stretchability is analyzed. Patterns limit conductive composite strain below 32% for stable conductance. Dielectrics stretch evenly above 100% without fracture. These features jointly deliver excellent stretchability and electrical performance. Tests show the patterned devices possess great capacitance-strain linearity. The composite dielectric material of (PDMS + AgNPs + Ni) achieves linearity of 0.968 within 0–50% strain. Sensors with (Ecoflex + MWCNT) dielectrics display reverse sensing behavior unlike prior studies. The devices gain R 2  = 0.995 at 0–100% strain to show excellent linearity and reliability. The composite dielectrics and microfluidic patterning strategy have bright prospects in flexible electronics and wearable sensing.