Table 2. Average hole-mobilities, on/off current ratios, and threshold voltages of planar OTFT devices and fiber-type transistor devices based on the graphene fiber electrodes.

Transistor type	Fiber electrode	μh [cm2 V−1 s−1]	Ion/Ioff	VT [V]
Planar device	hybrid fiber (0.6)a	20.4	1.0 × 105	−2.5
	hybrid fiber (1.2)	4.4	1.0 × 104	−2.6
	rGO fiber (0.6)	0.4	2.3 × 103	−2.7
Fiber-type device	hybrid fiber (0.6)	15.6	3.4 × 104	−1.2
	hybrid fiber (1.2)	3.4	8.0 × 103	−2.3
	rGO fiber (0.6)	0.3	6.0 × 103	−2.5

^aThe number in parentheses indicates the drawing ratio of the fiber electrode during fiber formation.