Pre-Strained Piezoelectric PVDF Nanofiber Array Fabricated by Near-Field Electrospining on Cylindrical Process for Flexible Energy Conversion

Abstract:

In this study, near-field electrospining on hollow cylindrical (NFES) process was used to fabricate permanent piezoelectricity of polyvinylidene fluoride (PVDF) piezoelectric nanofibers. With in situ electric poling, mechanical stretching and heating during NFES process, the pre-strained piezoelectric PVDF nanofibers with high stretchability and energy conversion efficiency can be applied at low-frequency ambient vibration to convert mechanical energies into electrical signals. By adjusting rotating velocity of the hollow cylindrical glass tube on X-Y stage, electric field, baking temperature and carbon nanotube (CNT) concentration in PVDF solution, the crystalline of β phase, polarization intensity and morphology of piezoelectric fiber can be controlled. XRD (X-ray diffraction) observation of PVDF fibers was characterized. With electric field 0.5×107 V/m (needle-to-tube distance 2 mm and DC voltage 5 kV), rotating velocity 400 r.p.m, baking temperature 80 °C and 0.03 wt% CNT in NFES process, it reveals a high diffraction peak at 2θ=20.8° of piezoelectric crystal β-phase structure. Then the array nanofibers were transferred onto a parallel copper electrode by using flexible insulation epoxy/PI film to provide packaging protection. When the sensor was tested under 5 Hz vibration frequency, the maximum induced voltage was 29.4 mVp-p.

• Periodical: Advanced Materials Research (Volume 566)
• Pages: 462-465
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.566.462
• Online since: September 2012
• Authors: Zong Hsin Liu, Li Wei Lin, Cheng Teng Pan, Zong Yu Ou
• Keywords: CNT, Near-Field Electrospining (NFES), Pre-Strained Nanofiber, PVDF

References

[1] J.Q. Liu, H.B. Fang, Z.Y. Xu, X.H. Mao, X.C. Shen, D. Chen, H. Liao, B.C. Cai, A mems-based piezoelectric power generator array for vibration energy harvesting, Microelectron J. 39 (2008) 802–806.

DOI: 10.1016/j.mejo.2007.12.017

[2] C.T. Pan, Z.H. Liu, Y.C. Chen, C.F. Liu, Design and fabrication of flexible piezo microgenerator by depositing ZnO thin films on PET substrates, Sensor Actuat A-Phys. 159 (2010) 96–104.

DOI: 10.1016/j.sna.2010.02.023

[3] C.T. Pan, Z.H. Liu, Y.C. Chen, Study of broad bandwidth vibrational energy harvesting system with optimum thickness of PET substrate, Curr Appl Phys. (2011).

DOI: 10.1016/j.cap.2011.10.005

[4] W.T. Chang, Y.C. Chen, R.C. Lin, C.C. Cheng, K.S. Kao, Y.C. Huang, B.R. Wu, Y.C. Huang, Design and fabrication of a piezoelectric transducer for wind-power generator, Thin Solid Films. 519 (2011) 4687–4693.

DOI: 10.1016/j.tsf.2011.01.015

[5] W.T. Chang, Y.C. Chen, R.C. Lin, C.C. Cheng, K.S. Kao, Y.C. Huang, Wind power generators based on ZnO piezoelectric thin films on stainless steel substrates, Curr Appl Phys. 11 (2010) 333–S338.

DOI: 10.1016/j.cap.2010.11.007

[6] D. Sun, C. Chang, S. Li, L.W. Lin, Near-field electrospinning, Nano Lett. 6 (2006) 839–842.

DOI: 10.1021/nl0602701

[7] C. Chang, K. Limkrailassiri, L.W. Lin, Continuous near-field electrospinning for large area deposition of orderly nanofiber patterns, Appl Phys Lett. 93 (2008) 123111.

DOI: 10.1063/1.2975834

[8] C. Chang, V.H. Tran, J. Wang, Y. Fuh, L.W. Lin, Direct-write piezoelectric polymeric nanogenerator with high energy conversion efficiency, Nano Lett. 10 (2010) 726–731.

DOI: 10.1021/nl9040719

[9] C. Chang, Y.K. Fuh, and L.W. Lin, A direct-write piezoelectric PVDF nanogenerator, 15th International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers), Denver. (2009) 1485–1488.

DOI: 10.1109/sensor.2009.5285796

[10] M. Neidhofer, F. Beaume, L. Ibos, A. Bernes and C. Lacabanne, Structural evolution of PVDF during storage or annealing, Polymer. 45 (2004) 1679–1688.

DOI: 10.1016/j.polymer.2003.12.066

[11] Y. Qi, N.T. Jafferis, K. Lyons, C.M. Lee, H. Ahmad, M.C. McAlpine, Piezoelectric ribbons printed onto rubber for flexible energy conversion, Nano Lett. 10 (2010) 524–528.

DOI: 10.1021/nl903377u

[12] J. Pu, X.J. Yan, Y.D. Jiang, C. Chang, L.W. Lin, Piezoelectric actuation of a direct write electrospun pvdf fiber, 23rd International Conference on Micro Electro Mechanical Systems (MEMS), Wanchai, Hong Kong, 24–28 Jan., (2010).

DOI: 10.1109/memsys.2010.5442418

[13] X. Chen, S.Y. Xu, N. Yao, 1. 6 V nanogenerator for mechanical energy harvesting using pzt nanofibers, Nano Lett. 10 (2010) 2133–2137.

DOI: 10.1021/nl100812k