Different materials with different electrical and mechanical properties have been tested in this experiment. 

The followings are the final chosen materials. The reason of choosing each is described in Design Parameters section.

• Silicone rubber as dielectric layer -  Commercial Ecoflex 0050, Smooth-on, Inc
• Polydimethylsiloxane (PDMS) as dielectric layer -  Commercial Sylgard® 184 silicone elastomer, Dow Corning Corporation
• PVA coated Copper wire ( Conductive Thread) as inner Electrode
• Silver coated Nylon (conductive thread) as Outer Electrode. 

Sensor structure and choice of different materials are optimized to maximize the triboelectric effect in Serpentine.

The unique form factor of serpentine allows it act as different types of force sensor simultaneously like touch, pressure, strain and torque sensor. Depend on a broad range of applications from wearable to furniture, medical devices and human health monitoring use cases, the Serpentine’s form factor is adjustable in length, thickness and stiffness. It is a great contribution to adjust such physical properties and collect wide range of electrical outputs.