Silk fibroin-based biodegradable piezoelectric composite nanogenerators using lead-free ferroelectric nanoparticles

A Flexible Lead‐Free BaTiO3/PDMS/C Composite Nanogenerator as a Piezoelectric Energy Harvester

“…[18][19][20][21][22] Piezoelectric nanocomposites composedo fp iezoelectric NPs and flexible polymers have demonstrated remarkable flexibility when used in flexible devices and wearable applications. [23][24][25][26][27] For example,K im [28] reported the silk-fibroin-based biodegradable piezoelectric composite nanogenerators using lead-free ferroelectric nanoparticles (BaTiO 3 ,Z nSnO 3 ,B i 0.5 (Na 0.82 K 0.18 ) 0.5 TiO 3 ,a nd K 0.5 Na 0.5 Nb 0.995 Mn 0.005 O 3 ), which could obtain maximum output voltages and current densities of 2.2 Va nd 0.12 mAcm À2 .S hin [29] reported high-performance flexible NGs based on ac omposite thin film composed of hemispherically aggregated BaTiO 3 NPs and poly-(vinylidene fluoride-co-hexafluoropropene) P(VDF-HFP), whiche xhibited high electricalo utput up to 5Vand 750 nA by cyclic measurementu nder bending. Park [30] reported an anocomposite generator (NCG) that achived as imple, low-cost, and large area fabrication based on BaTiO 3 NPs synthesized via ah ydrothermal reaction and graphitic carbons (such as singlewalled and multiwalled carbon nanotubes and reduced graphene oxide), which repeatedly generateda no pen-circuit voltage (V oc )o fa pproximately 3.0 Va nd as hort-circuit current signal of 300 nA.…”

Nature Driven Bio‐Piezoelectric/Triboelectric Nanogenerator as Next‐Generation Green Energy Harvester for Smart and Pollution Free Society

“…[99] The naturally abundant spider silk micro fibrils contain huge amount of alanine and glycine block sequences based different types of amino proteins (acids) in its primary structure level. [102] Further, the development of cooperative electromechanical mutual interaction between the self-aligned adjacent silk micro fibers under external applying force also significantly participate to enhance the piezoelectric response of the material compared to a single fiber. [98] In the crystalline backbone of the spider silk fibrils, amino proteins (acids) enriched αhelical elastic structure and plate like β-sheets structure are strongly associated by intra-and intermolecular H-bonding.…”

“…[136] Under an applying external mechanical pressure on the well-aligned SS fibers resulted rubbing between the adjacent surfaces of alpha (α)-helix structures through intermolecular CONH H-bonding (Figure 10l,m). [103,102] [103,102] …”

Structural and Piezoelectric Properties of (Na1−xKx)NbO3 Platelets and Their Application for Piezoelectric Nanogenerator

“…(Na 1− x K x )NbO 3 (NKN) compounds have been considered as promising lead‐free materials for use in piezoelectric applications . NKN nanoparticles, nanofibers, and thin films have been used for the fabrication of PNGs . PNGs synthesized using Li‐doped NKN nanoparticles and Cu nanowires mixed with polydimethylsiloxane (PDMS) have shown relatively large output voltages of 12 V and currents of 1.2 μA .…”

“…[16][17][18] NKN nanoparticles, nanofibers, and thin films have been used for the fabrication of PNGs. [19][20][21][22][23] PNGs synthesized using Li-doped NKN nanoparticles and Cu nanowires mixed with polydimethylsiloxane (PDMS) have shown relatively large output voltages of 12 V and currents of 1.2 lA. 23 However, PNGs fabricated using Mn-doped NKN nanofibers exhibit only a small output voltage of 0.3 V and current of 50 nA.…”