All Organic Aqueous Processable Piezo‐Phototronic Ink for Strain Modulated Photoresponse

Abstract In this study, poly(vinylidene fluoride) (PVDF) nanoparticles (NPs) are fabricated with the preferred electroactive δ‐phase due to interfacial crystallization at ternary phase system, i.e., PVDF‐DMF‐water ambient conditions. Further, surfaces of PVDF NPs modified in situ copolymerized polydopamine‐polyethylenimine (PDA‐PEI) ensure well dispersion poorly dispersive water. The piezoresponse force microscopy (PFM) confirms piezo‐ and ferro‐electric capabilities PDA‐PEI coated (i.e., PVDF@f Ink) an associated reversal Δϕ ≈ 180° upon application a very low DC bias voltage that indicates their applicability power devices. Additionally, flexible piezoelectric nanogenerator (f‐PNG) Ink shows promising electrical output as mechanical energy harvester. It also promises physiological signals detection abilities superior mechanoacoustic behavior. Furthermore, f‐PNG has shown excellent photo‐detection piezo‐phototronic properties. fast photoresponse 0.43 s, responsivity 24 µA W −1 , specific detectivity ≈1.4 × 10 Jones, ideal choice for optoelectronic Thus, it is expected comprising can be utilized ink