Application of Flexible Friction Nanogenerator and Sensor in Sports Safety Monitoring

Table 2

Ranking of electricity-generating capacity of some tribo-nanomaterials.

Rank	Positive	Negative
1	Polyformaldehyde 1.3–1.4	Polybisphenol carbonate
2	Ethyl cellulose	Polychloroether
3	Polyamide 11	Polyvinylidine chloride (Saran)
4	Polyamide 6–6	Polystyrene
5	Melamine foam	Polyethylene
6	Wool, knitted	Polypropylene
7	Silk, woven	Polyimide (Kapton)
8	Aluminum	Polyvinyl chloride (PVC)
9	Paper	Polydimethylsiloxane (PDMS)
10	Cotton, woven	Polytetrafluoroethylene (Teflon)