A high performance all-organic flexural piezo-FET and nanogenerator via nanoscale soft-interface strain modulation

Abstract

Flexural strain fields are encountered in a wide variety of situations and invite novel device designs for their effective use in sensing, actuating, as well as energy harvesting (nanogenerator) applications. In this work we demonstrate an interesting all-organic device design comprising an electrospun P(VDF-TrFE) fiber-mat built directly on a conducting PANI film, which is also grown on a flexible PET substrate, for flexural piezo-FET and nanogenerator applications. Orders of magnitude stronger modulation of electrical transport in PANI film is realized in this device as compared to the case of a similar device but with a uniform spin-coated P(VDF-TrFE) film. We find that in the flexural mode of operation, the interaction between the laterally modulated nanoscale strain field distributions created by the fibers and the applied coherent strain field strongly influences the carrier transport in PANI. The transport modulation is suggested to occur due to strain-induced conformational changes in P(VDF-TrFE) leading to changes in carrier localization-delocalization. We further show that the fiber-mat based device system also works as an efficient nanogenerator capable of delivering power for low power applications.

Durable, efficient, and flexible piezoelectric nanogenerator from electrospun PANi/HNT/PVDF blend nanocomposite

“…But, PPNF, PHNF and BNCNF were fine, smooth, uniform and the AFD decreased drastically. This is due to the addition of PANi and HNT, which increase the electrical conductivity of the solutions .…”

“…Upon addition of PANi to poly(vinylidenefluorideco-trifluoroethylene) (PVDF-TrFE) nanofibers, the current values increased by about one order of magnitude upon the application of strain. Also, the electrical conductivity was found to increase with PANi loading [38,39]. Similarly, when PVDF/PANi membranes were subjected to bending and tapping, the current output increased significantly.…”

An Effective Electrical Throughput from PANI Supplement ZnS Nanorods and PDMS-Based Flexible Piezoelectric Nanogenerator for Power up Portable Electronic Devices: An Alternative of MWCNT Filler

“…The results indicate, the protonated green emeraldine salt form of PANI can be prepared via an easy process and might be alternative of MWCNTs as conducting filler to fabricate a piezoelectric generator. 31 Because the preparation of MWCNTs is quite troublesome and also difficult to disperse in the solvent systems due to weak vander Waal's forces, whereas, the conductive emeraldine form of PANI can be prepared by conventional and inexpensive polymerization methodology.…”

Memristive Properties of PANI-Polysterene/PVDF-TrFE Interface

“…For this type of heterojunctions, a characteristic abrupt interface of electron states is their typical feature [10]. It is reported in the paper [12] that the charge transport modulation occurs due to the strain-induced conformational changes in PVDF-TrFE leading to the changes in the carrier localization-delocalization. Under the application of flexural strain, the polarization in PVDF-TrFE increases.…”

“…All polymer composite materials of the type "semiconductor PANI (emeraldine salt)/ferroelectric PVDF-TrFE" cause widespread interest for their use as materials for developing heterojunction diodes [10], organic ferroelectric memory devices [11], flexural piezo-FET and nanogenerators [12]. The heterojunction formation is expected from the band offsets of two polymers near the Fermi level.…”