Open AccessEffect of Varying Solvents on Structural Properties of Annealed PVDF-Trfe Thin Films
Author(s) -
Ahmad Kamil Arshad,
Muhamad Naiman Sarip,
Muhamad Naiman Sarip,
E. Z. Engku Zaharah,
Monna Rozana
Publication year - 2019
Publication title -
international journal of engineering and technology
Language(s) - English
Resource type - Journals
ISSN - 2227-524X
DOI - 10.14419/ijet.v7i4.14.27713
Subject(s) - solvent , materials science , dimethylformamide , solubility , fourier transform infrared spectroscopy , phase (matter) , polymer chemistry , thin film , analytical chemistry (journal) , band gap , chemical engineering , nuclear chemistry , chemistry , organic chemistry , nanotechnology , optoelectronics , engineering
PVDF-TrFE (70:30 mol%) powders were dissolved individually in three polar solvents of Diethyl Carbonate (DEC), Methyl Ethyl Ketone (MEK) and N-, N-, Dimethylformamide (DMF). The solution was spin coated and formed PVDF-TrFE films of 250 nm thickness; UN DEC, UN MEK and UN DMF films. PVDF-TrFE powders were found to readily dissolve in DMF solvent as indicated by Hansen solubility parameters (δt). Hansen parameter showed small difference in reading (δt = 1.7) for PVDF-TrFE and DMF, and low relative energy difference (RED) value. All films were annealed at 120°C (AN DEC, AN MEK, AN DMF). The AN DMF film showed high presence of polar β-phase crystals as evident from the ATR-FTIR spectrum. This is given by the significant peaks at 848, 1190, and 1290 cm-1. The trend is consistent with XRD pattern, where relative increment of cps value (53%) at 19.2° (2θ) is observed. This further supports the high degree of β-phase crystals observed in AN DMF film.