Abstract
We have successfully designed, fabricated, and tested transparent and stretchable capacitors using adhesive polydimethylsiloxane (a-PDMS), which not only solidly adheres to commercial 184 polydimethylsiloxane (184 PDMS) films but also conformally adheres to skin or other various curved material surfaces. First, two sheets of 184 PDMS impregnated with Ag nanowires (AgNWs) were prepared, followed by face-to-face lamination using a-PDMS, resulting in a capacitor with a sandwich structure consisting of 184 PDMS/AgNWs/a-PDMS/AgNWs/184 PDMS. The adhesion between a-PDMS and 184 PDMS was so strong that no interfacial fracture was observed between the two materials during peel tests. Even after repeatedly applying a strain of 75% to the sandwich structure (up to 1000 times), the deterioration of the electrical properties of the sensor was insignificant. The capacitance of the sensor was very sensitive to changes in applied strain and pressure. When the sensor was attached to the skin or a shoe heel using a-PDMS, the capacitance was also quite sensitive to changes in the movement of the human body.
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