“…For example, Chen et al proposed a TENG with tile nanostructures for the detection of human health with an optimal output voltage of 37.8 V, an output current of 1.8 μA, and a transmitted charge of 14.1 nC, which can be very sensitive for the detection of human health [ 2 ]. According to the conversion mechanism, TENGs are generally classified into four modes, which are the vertical contact-detachment mode [ 3 , 4 , 5 , 6 ], horizontal sliding mode [ 7 , 8 , 9 , 10 ], single-electrode mode [ 11 , 12 , 13 , 14 ] and independent layer mode [ 14 , 15 , 16 , 17 , 18 ].…”