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Even though contact electrification has been studied for a long time, themechanism of charge transfer still remains elusive. Most of previous reportsonly focus on the driving force of charge transfer. However, to betterunderstand the mechanism of charge transfer, we believe contact itself forsupplying transferring path that charges taking also need to be understood.Here, we focus on the in-plane symmetry of contact in contact electrificationby utilizing a uniaxial strain to change the material's isotropic nature toanisotropic. A clear anisotropic charge transfer is observed by contactingaxially stretched rubber films at different rotational angles, which couldarise from fluctuation of contacting area in microscale. A universal ellipsemodel is also proposed for qualitatively describing the anisotropy of contactregardless of the specific driving force of contact electrification.

Uniaxial Strain-Induced Anisotropic Charge Transfer in Contact Electrification