banner.jpg 097 PCB-Based Multi-Spinnerets for High-Efficiency Electrospinning Piezoelectric nonwoven Fiber Fabrics C. K. Yen1,2, C. T. Pan1,2, Z. H. Liu1,2,3, F. C. Hsu3, L. W. Lin4, J. C. Huang5 and Y. L. Lin1 1Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan 2Center for Nanoscience & Nanotechnology, National Sun Yat-Sen University; National Science Council Core Facilities Laboratory for Nano-Science and Nano-Technology in Kaohsiung-Pingtung area, Taiwan 3Micro/Meso Mechanical Manufacturing R&D Department,Metal Industries Research and Development Centre, Kaohsiung 81160, Taiwan 4Department of Mechanical Engineering and Berkeley Sensor and Actuator Center, University of California, Berkeley, California 94720 5Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung Taiwan ABSTRACT

Fibrous piezoelectric structures are highly desirable for wearable sensors to improve personalized healthcare. In this study, PCB (printed circuit board)-based multi-spinnerets were used to efficiently electrospin the nonwoven fiber fabrics (NFFs). Meanwhile this multi-jet hollow cylindrical near-field electrospinning (MHCNFES) process induced ferroelectricity in polyvinylidene fluoride (PVDF) fibers. The PCB-based multi-spinnerets were made of semi-spherical spinneret array mounted on the electrode patterns via PCB layout process and micro-electrical discharge machining (Micro-EDM) treatment. The piezoelectric NFFs with a thickness of ∼3 µm as active layer were transferred onto a polymer substrate and fixed at both ends of electrodes to make the flexible sensing device. The device can generate an average voltage of ∼0.16 Vp-p under 9 Hz mechanical vibration with a strain of 0.05%. This new process can easily control the structural diameter, length, and density. Thus the MHCNFES NFFs can promote the applications of sub-micro/nano-polymer fibers in various fields.

Keywords: Printed Circuit Board (PCB), Multi-spinnerets, Nonwoven Fiber Fabrics (NFFs), Multi-Jet Hollow Cylindrical Near-Field Electrospinning (MHCNFES), Polyvinylidene Fluoride (PVDF), Micro-Electrical Discharge Machining (Micro-EDM).

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