Fig. 3: Micro-nano hierarchical interfaces based-output enhancement mechanism. | npj Flexible Electronics

Fig. 3: Micro-nano hierarchical interfaces based-output enhancement mechanism.

From: Stretchable nanogenerator with micro-nano hierarchical interfaces for self-powered biometric authentication

Fig. 3

a Comparison in the contracted state of triboelectric pair (i.e., PDMS & TPU) based on different surface morphology, including smooth PDMS (S-PDMS) & solid TPU, S-PDMS & TPU nanofiber, micro-pyramid PDMS (P-PDMS) & solid TPU, P-PDMS & TPU nanofiber. b Surface morphology of P-PDMS (Scale bar: 40 μm), solid TPU (Scale bar: 10 μm), TPU nanofiber (i.e., electrospun TPU (3-2), scale bar: 10 μm), electrospun TPU (2-1) (Scale bar: 10 μm), and electrospun TPU (1-0) (Scale bar: 10 μm). c Normalized positive voltage outputs of the TENG model based on different structures of triboelectric pair. d Normalized positive voltage outputs of the TENG model based on different TPU friction layers.

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