Studies On Preparation And Properties Of Stretchable Electronic

Stretchable electronic devices can undergo repeated tensile, compressive, folded and twisted deformations, and they are suitable to be applied to complex curvilinear surfaces. Therefore, compared with traditional electronic devices, stretchable electronic devices have better application prospects in the fields of bio-medical systems, displaying systems, imaging systems, skin electronics and solar cell circuit board. At present, the organic thin film transistor and sensors as two important fields of stretchable electronic, how to implement the stretchable of them has become a very popular topic.In this paper, we launched a series of studies which about how to realizethe the stretchable of semiconductor layer and the electrode, preparate stretchable stress sensor. The main contents include:(1) Properties and morphology changes of P3HT/SIS mixture was studied under different tensile ratio. The study found that with the increase of stretching ratio, device performance was consistently decreased. the field effect mobility of the device reached about 2.26 x 10-3 cm2 V-1s1 when without stretching; When stretching to 10%, the device mobility was down slightly to 2.22 x 10-3 cn2V’s-1; Continue to stretch to 20%, the mobility of the device down to 1 x 10-3; Device mobility decreased to 9.3 X 10-4 cm2V-1s-1 when stretched to 40%; And continue to stretch to 60%, semiconductor device performance almost disappeared.(2) Mult-walled carbon nanotube solution was prepared by using sodium dodecyl sulfonate(SDS) and poly(3,4-ethylenedioxythiophene) polymerized with poly(styrenesulfonate)(PEDOT/PSS) as disperser, while polydimethylsiloxane-(PDMS) was used to make the silicone wafer hydrophilic or hydrophobic. Carbon nanotube thin film electrode can be made using solution based fabrication. The patterned electrode was used in the organic thin film transistor, the filed-effect mobility was 0.01 cm2 V-1 s-1 and 0.0075 cm2 V-1s-1, both the Ion/off ratio is 3×103.(3) A highly flexible and stretchable strain sensor has been prepared by coating chemical reduction of graphene oxide on electrospun polyurethane nanofiber mats. The resistance electrical property of stress sensor changes one fouth on 50% strains condition. The morphology and stability of electrospun polyurethane nanocomposite mats were also studied. The flexible and stretchable strain sensor has great potential for practical application such as efficient human-motion detection. This cheap and simple process of graphene layer provides an effective fabrication for graphene stretchable electronic devices and strain sensors due to excellent stability and electrical proper.