Effect of ionic liquid surfactant additive on β-phase formation and piezoelectric response of PVDF nanofibers
Paper ID : 1602-ICNS
Arezo Mahdavi Varposhti *1, Maryam Yousefzadeh2, ELAHE Kowsari3, Masoud Latifi4
1Department of textile engineerin, faculty of nanofibrous structure engineering, Amirkabir University of Technology (A.U.T) Tehran polytechnic,Tehran,Iran
2Amirkabir University of Technology
3Department of Chemistry, Amirkabir University of Technology, 159163-4311, Tehran, Iran.
4Department of textile engineering, AmirKabir University of Technology (A.U.T) Tehran polytechnic, Tehran, Iran
Nanofibrous assemblies have attracted much attention due to their high specific surface area and functional properties for variety of applications such as electronic devices, sensors, tissue engineering, and biomedical uses. Polyvinylidene fluoride (PVDF) is a good piezoelectric material, which widely use in the fields of human-related applications, such as, force sensors and nanogenerators for its biocompatibility, flexibility and lightweight. It is a semi-crystalline material including the nonpolar α phase, polar β-phase, γ phase and δ phase. The piezoelectricity originates from dipole on PVDF chains forming the β-phase. In the present study, we focus on improvement the piezoelectric properties of PVDF and increasing the sensing properties of nanofibrous pressure sensors by preparing composite nanofibers of PVDF/ionic liquid surfactant (ILS). The ILS showed good affectivity on the diameter, morphology, and crystalline structure of PVDF nanofiber. The FTIR and XRD results reveal that the addition of synthesized ILS to the PVDF solution could enhanced the electrical response of the pressure sensors. The results show that when we used 4% w/w ILS in PVDF solution, the generated voltage increase up to 5000 mV compare to pure PVDF nanofibers based sensors. The fraction of the beta-phase of PVDF/ILS composite nanofibers also improve up to 99%.
PVDF; nanofibers; surfactant; piezoelectric.
Status : Abstract Accepted (Poster Presentation)