Formation of Locally Crystallized Ferroelectric Poly(vinylidene fluoride-ran-trifluoroethylene) Nanodots Based on Heated Atomic Force Microscopy

2013 ◽  
Vol 117 (24) ◽  
pp. 12890-12894 ◽  
Author(s):  
Jong Yeog Son ◽  
Inhwa Jung ◽  
Young-Han Shin
Keyword(s):  
Atomic Force Microscopy ◽  
Vinylidene Fluoride ◽  
Force Microscopy ◽  
Atomic Force ◽  
Poly Vinylidene Fluoride

Molecular Ferroelectricity of Vinylidene Fluoride Oligomer Investigated by Atomic Force Microscopy

2001 ◽  
Vol 40 (Part 1, No. 6B) ◽  
pp. 4361-4364 ◽  
Author(s):  
Kei Noda ◽  
Kenji Ishida ◽  
Atsushi Kubono ◽  
Toshihisa Horiuchi ◽  
Hirofumi Yamada ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Vinylidene Fluoride ◽  
Force Microscopy ◽  
Atomic Force

An approach to durable poly(vinylidene fluoride) thin film loudspeaker

2003 ◽  
Vol 18 (12) ◽  
pp. 2904-2911 ◽  
Author(s):  
C.S. Lee ◽  
J.Y. Kim ◽  
D.E. Lee ◽  
J. Joo ◽  
S. Han ◽  
...  
Keyword(s):  
Thin Film ◽  
Indium Tin Oxide ◽  
Photoelectron Spectroscopy ◽  
Vinylidene Fluoride ◽  
X Ray ◽  
Force Microscopy ◽  
Low Surface Energy ◽  
Oxide Electrodes ◽  
Atomic Force ◽  
Poly Vinylidene Fluoride

The piezoelectric poly(vinylidene fluoride) (PVDF) surface possessing low surface energy was modified by the ion-assisted-reaction (IAR) method for the application of thin film speaker. The IAR-treated hydrophilic PVDF surface was investigated using atomic force microscopy and x-ray photoelectron spectroscopy. The adhesion strength between various types of electrodes and the film was dramatically improved due to the hydrophilic functional groups, such as –C–O–, –(C=O)–, –(C=O)–O–, and so forth. A durable loudspeaker film was fabricated by enhancing the adhesion between the screen-printed poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS) and the modified PVDF films. The PVDF speaker film with the PEDOT/PSS electrode showed higher durability, flatter sound pressure level characteristics, and easier processability compared to metals or indium tin oxide electrodes.

Fabrication and Study of Hot Pressed Co0.6Zn0.4Fe2O4-PVDF PbTi0.7Zr0.3O3 and Co0.6Zn0.4Fe2O4-PVDF-BaTi0.7Zr0.3O3 Multiferroic Composite Films

2012 ◽  
Vol 189 ◽  
pp. 179-188
Author(s):  
Kanhaiya Lal Yadav ◽  
Amit Kumar
Keyword(s):  
Vinylidene Fluoride ◽  
Composite Films ◽  
Homogeneous Distribution ◽  
Coupling Constant ◽  
Force Microscopy ◽  
Atomic Force ◽  
Poly Vinylidene Fluoride ◽  
Press Method ◽  
Linear Fit ◽  
Multiferroic Composite

Multiferroic composite films of (i) Co0.6Zn0.4Fe2O4(CZFO)-PbTi0.7Zr0.3O3(PZT)-poly (vinylidene-fluoride)(PVDF) and (ii) Co0.6Zn0.4Fe2O4-BaTi0.7Zr0.3O3(BZT)-PVDF were prepared by hot press method for magneto-dielectric studies. Different multiferroic composite films were named as CPT-1 (CZFO:PZT; 3:1) CPT-2 (CZFO:PZT; 3:2), CPT-3(CZFO:PZT; 3:3), CBT-1 (CZFO:BZT; 3:1), CBT-2 (CZFO:BZT; 3:2) and CBT-3 (CZFO:BZT 3:3). The entire composites were made with 70% ceramic and 30% wt. PVDF polymer. Line scanning by Scanning electron microscope (SEM) and Atomic force microscopy (AFM) images shows a homogeneous distribution of constituents in the composite film. It is observed that the dielectric permittivity (ε´) follows the MaxwellWagner model. Remnant polarization (Pr) and magnetocapacitance (MC) were found to vary with an applied magnetic field at room temperature. The absolute value of the magnetocapacitance (MC) was found higher for CBT-2 (MC ~ 0.79%) than for CBT-3 (MC ~ 0.57%) but lower than for CPT-3 (MC ~ 1.2%). A linear fit of the MC with M2 yields the magnetoelectric quadratic coupling constant |γ| ~ 4.96 × 10-6 for CBT-1, which is around 150 times lower than for CPT-1 (|γ| ~ 7.92 × 10-4).

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