Fig. 4: Comprehensive selection rules of triboelectric materials for DC-TENG.
From: Selection rules of triboelectric materials for direct-current triboelectric nanogenerator
The radar chart of normalized indexes of PVC, FEP, PTFE, PEEK, PI, and PVDF, where the σSCD*, σDC*, η*, 1/μ*, and ρ* is the normalization of σSCD: surface charge density, σDC: DC charge density, η: (σDC/20)/σSCD, 1/μ: the reciprocal of friction coefficient, ρ: stability, respectively.
