Electroactive properties of electrospun silk fibroin for energy harvesting applications. (December 2019)

• Record Type: Journal Article
• Authors: Sencadas, Vitor; Garvey, Christopher; Mudie, Stephen; Kirkensgaard, Jacob J.K.; Gouadec, Gwenaël; Hauser, Samuel
• Is Part Of: Nano energy. Volume 66(2019)
• Publication Date: 2019-12
• Subjects: Silk fibroin -- Natural proteins -- Piezoelectricity -- Energy harvester -- E-skin; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2019.104106
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Silk fibroin (SF) is a sustainable material explored with success in the textile and biomedical industries. This protein has outstanding mechanical and electrical properties that could be used for advanced technological applications. In this work, silk fibroin fibrous membranes were processed by electrospinning, with conditions obtained through orthogonal experimental design. Due to their high-water affinity, the membranes were stabilized against aqueous environments by exposure to methanol (MeOH) in vapor phase. Individual SF fibres present an apparent piezoelectric constant ( d 33 ) of 38 ± 2 pm/V for the as-spun ones and 28 ± 3 pm/V for those submitted to MeOH in vapor phase, a piezoelectric voltage coefficient ( g 33 ) of 1.05 and 0.53 Vm.N −1, respectively, a mechano-sensibility of 0.15 V kPa −1, an energy storage capacity of 85 μJ, and an efficiency up to 21%. When the SF is submitted to MeOH in vapor phase, no effect was observed in the protein secondary structures. This work represents a new insight into the origin of the piezoelectric properties of SF and opens new opportunities for applications in microelectronics engineering for self-powered epidermal electronics, implantable medical devices, and personalized health care systems. Graphical abstract: Image 1 Highlights: Electrically poled silk fibroin nanofibers can be produced through electrospinning. Silk Fibroin membranes presents a d 33 up to 38 ± 2 p.m./V, and g 33 of 1.05 Vm.N −1 . The energy harvester have a mechano-sensibility of 0.15 V kPa −1, an energy storage capacity of 85 μJ. The harvester have a power density of 5 μW/cm 2 and an efficiency of 21%. Silk fibroin can be applied in smart garments for self-powered human motion monitoring.