Fig. 5: Surface charge dissipation properties and mechanism.
From: Visualization and standardized quantification of surface charge density for triboelectric materials
a Decay of the negative surface charge on the PTFE (The inset images demonstrate the surface charge density of PTFE at 0d, 70d and 140d, scale bar: 3 mm, color bar: −4 nC cm−2 ~ 4 nC cm−2). b Comparison of the negative surface charge dissipation properties of various materials. c Decay of the positive surface charge on the PTFE (The inset images demonstrate the surface charge density of PTFE at 0d, 70d and 140d, scale bar: 3 mm, color bar: −4 nC cm−2 ~ 4 nC cm−2). d Comparison of the positive surface charge dissipation properties of various materials. e The electron trap level distribution of PTFE, PVC, Si rubber and PE. f The hole trap level distribution of PTFE, PVC, Si rubber, and PE. g Mechanism of the surface charge dissipation on polymer surface. h-i The influence of relative humidity on (h) negative and (i) positive surface charge decay process of PTFE (The inset images demonstrate the surface charge density of PTFE at 50% R.H., 70%R.H. and 90%R.H. after 7d, scale bar: 3 mm, color bar: -4 nC cm−2 ~ 4 nC cm−2).
