Fig. 4: Investigations on contact force and electron transfer process during contact-electrification. | Nature Communications

Fig. 4: Investigations on contact force and electron transfer process during contact-electrification.

From: A contact-electro-catalysis process for producing reactive oxygen species by ball milling of triboelectric materials

Fig. 4

a Schematic view of electron transfer during contact-electrification at atomic scale under different contact forces. The electron clouds of two atoms are depicted in light blue and green colors, respectively. More electrons (denoted by yellow circle) will be transferred once the distance (d) between these two atoms diminishes as the result of higher applied force (F). b Measured transferred charges when a polytetrafluoroethylene (PTFE) film repeatedly contacts with a Cu film under various given contact forces. The inset depicts a linear motor that links with a force sensor for performing cyclic contact under various given forces. c Simulated spatial distribution of charge density difference between H2O molecules and PTFE chains at different distances. d Simulated spatial distribution of charge density difference between O2 molecules and PTFE chains at different distances. Yellow and blue isosurfaces denote areas of charge accumulation and depletion (±0.0002 e Å−3), respectively. Figure 4c, d was produced with VESTA51. Source data are provided as a Source Data file. Created with SolidWorks and Adobe Illustrator.

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