Fabrication and Characterization of CoFe2O4-Polymer Nanocomposite Thin-Films

2013 ◽  
Vol 1507 ◽  
Author(s):  
Xiaohua Liu ◽  
Shuangyi Liu ◽  
Stephen O’Brien
Keyword(s):  
Thin Films ◽  
Magnetic Particles ◽  
Cobalt Ferrite ◽  
Vinylidene Fluoride ◽  
Structural Information ◽  
Effective Permittivity ◽  
Polymer Nanocomposite ◽  
Magnetic Devices ◽  
Nanocomposite Thin Films ◽  
Poly Vinylidene Fluoride

ABSTRACTMagnetic cobalt ferrite nanoparticles provide a pathway towards nanocomposites, due to the ability to fabricate particle-matrix thin films in the submicron range. In this work flexible particulate 0-3 type thin-films, composed of magnetic CoFe2O4 particles (8-18 nm) and ferroelectric poly(vinylidene fluoride-co-hexafluoropropene) (P(VDF-HFP)) polymer, have been fabricated via multiple spin-coating. The thickness of the thin-films was controlled in the range of 500 nm to 1.2 μm, with magnetic particles dispersively embedded in the polymer matrix. Structural information was analyzed by TEM, XRD, HRTEM and SEM. The dielectric and magnetic properties of the cobalt ferrite/copolymer thin films are systematically investigated. The nanocomposite thin films exhibit composition-dependent effective permittivity and loss tangent, as well as temperature and composition-dependent specific saturation magnetization (Ms). The coercivity (Hc) was not affected by the composite’s composition. These films have great potential in smart magnetic devices and biomagnetic applications.

Tunable photoluminescence emissions and large dielectric constant of the electroactive poly(vinylidene fluoride–hexafluoropropylene) thin films modified with SnO2 nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (36) ◽  
pp. 29931-29943 ◽  
Author(s):  
Nur Amin Hoque ◽  
Pradip Thakur ◽  
Niranjan Bala ◽  
Arpan Kool ◽  
Sukhen Das ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Sno2 Nanoparticles ◽  
Optically Active ◽  
Dielectric Constants ◽  
Large Dielectric Constant ◽  
Nanocomposite Thin Films ◽  
Poly Vinylidene Fluoride

Fabrication of optically active, electroactive and percolative SnO2 NPs/PVDF–HFP nanocomposite thin films with remarkable dielectric constants.

Projectile Impact Shock-Induced Deformation of One-Component Polymer Nanocomposite Thin Films

ACS Nano ◽  
2021 ◽  
Vol 15 (2) ◽  
pp. 2439-2446
Author(s):  
Jinho Hyon ◽  
Manny Gonzales ◽  
Jason K. Streit ◽  
Omri Fried ◽  
Olawale Lawal ◽  
...  
Keyword(s):  
Thin Films ◽  
Polymer Nanocomposite ◽  
Projectile Impact ◽  
Nanocomposite Thin Films ◽  
Impact Shock

Effect of Interface and Crystallinity on the Ferroelectric Properties of Poly(Vinylidene Fluoride-Trifluoroethylene) Copolymer Thin Films

2001 ◽  
Vol 665 ◽  
Author(s):  
Feng Xia ◽  
H.S. Xu ◽  
Babak Razavi ◽  
Q. M. Zhang
Keyword(s):  
Thin Films ◽  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Large Change ◽  
Thickness Dependence ◽  
Dielectric Measurement ◽  
Switching Speed ◽  
Wide Range ◽  
Poly Vinylidene Fluoride ◽  
Polarization Level

ABSTRACTFerroelectric polymer thin films are attractive for a wide range of applications such as MEMS, IR sensors, and memory devices. We present the results of a recent investigation on the thickness dependence of the ferroelectric properties of poly(vinylidene fluoridetrifluoroethylene) copolymer spin cast films on electroded Si substrate. We show that as the film thickness is reduced, there exist two thickness regions. For films at thickness above 100 nm, the thickness dependence of the ferroelectric properties can be attributed to the interface effect. However, for thinner films, there is a large change in the ferroelectric properties such as the polarization level, the coercive field, and polarization switching speed, which is related to the large drop of the crystallinity in the ultrathin film region (below 100 nm). The results from Xray, dielectric measurement, and AFM all indicate that there is a threshold thickness at about 100 nm below which the crystallinity in the film reduces abruptly.

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