Light-induced reversible phase transition in polyvinylidene fluoride-based nanocomposites

Abstract

We report switching behavior between the ferroelectric β phase and the paraelectric α phase in polyvinylidene fluoridemultiwalled carbon nanotube (PVDF-CNT) nanocomposite. The PVDF-CNT nanocomposite thin films are prepared on Au/Si substrates using spin coating technique. Various characterization techniques reveal the interaction of PVDF with CNTs as a nucleating agent for nucleating ferroelectric β phase in PVDF. A wavelength-independent reversible phase transformation behavior is observed for the PVDF-CNT nanocomposite during the measurement of laser power modulated micro-Raman spectroscopy (533 and 632 nm lasers). This observation opens up an innovative route where we can control the interactions between polar nanocarbons and PVDF using visible light.

Tunable Substrate Functionalities Direct Stem Cell Fate toward Electrophysiologically Distinguishable Neuron-like and Glial-like Cells

“…Figure a displays the survey spectra recorded with r-PVDF/MWNT and r-PVDF/BT/MWNT. The deconvoluted peaks of C 1s and F 1s at 285 eV and 687 eV exhibit the chemical environment around C corresponding to H–C–H and F–C–F of PVDF, respectively (Figure b–f) . The presence of MWNTs at the surface of r-PVDF/MWNT can be rationalized based on the evolution of the deconvoluted peak of CC at 284 eV (parts e–h).…”

“…The XPS-based compositional analysis confirmed the presence of MWNT and BT on the surface of PVDF nanocomposites. Figure 2a 22 The presence of MWNTs at the surface of r-PVDF/MWNT can be rationalized based on the evolution of the deconvoluted peak of CC at 284 eV (parts e−h). The deconvoluted peak corresponding to the Ba 3d shows the presence of Ba−O and Ba−Ti corresponding to BaTiO 3 in r-PVDF/BT/MWNT.…”

Self‐Healable and Stretchable Ionic‐Liquid‐Based Thermoelectric Composites with High Ionic Seebeck Coefficient

“…[ 26,27 ] This consistent shift of CF 2  peaks indicates PVDF‐HFP matrix intimately interacts with both EMIM:OTf and FS through ion–dipole and dipole–dipole interactions. [ 26 ] Similarly, the N +  peak of EMIM cation are located at 401.6 and 402.0 eV for PVDF‐HFP/EMIM:OTf and PVDF‐HFP/EMIM:OTf/FS, respectively, which provides direct evidence for close interaction between EMIM cations and FS.…”

Fabrication of Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate)/Poly(vinylidene fluoride) Nanofiber-Web-Based Transparent Conducting Electrodes for Dye-Sensitized Photovoltaic Textiles

“…However, the intensity of the peak drastically decreased in the P3D7 and P2D8 samples. In addition, the C 1s peak of PEDOT decreased as the DMSO mixing ratio increased, whereas the peaks at 290.9 and 286.5 eV corresponding to the −CF 2 – and −CH 2 – functional groups of PVDF gradually increased …”

“…In addition, the C 1s peak of PEDOT decreased as the DMSO mixing ratio increased, whereas the peaks at 290.9 and 286.5 eV corresponding to the −CF 2 − and −CH 2 − functional groups of PVDF gradually increased. 55 To examine the effect of the DMSO mixing ratio on the PVDF crystal structure, XRD analysis of the untreated PVDF nanofiber web (UT) and four samples (P10D0, P9D1, P3D7, P2D8) was performed. As a result, strong peaks corresponding to the α-, β-, and γ-phases were observed around 2θ = 20°in the untreated PVDF nanofiber web (Figure S8).…”