Table 2 Comparing the gauge factors of various flexible strain sensors reported in the literature.

From: Single and bundled carbon nanofibers as ultralightweight and flexible piezoresistive sensors

Material

Gauge factor

Linearity

Carbon Black-PDMS25

1.8−5.5

Two linear regions

Carbon Black-Ecoflex39

3.8

Nonlinear

Single CNF strain sensor35

1.96−2.55

Linear

Graphene-Rubber33

35

Linear and exponential regions

Graphene ink-on-PDMS40

37

Linear

Graphene-PDMS foam23

2.87−8.77

Two linear regions

CNTs-Ecoflex21

1−2.5

Linear

CNF bundle (This work)

11.14

Linear