Flexible high dielectric polystyrene/ethylene‐α‐octene copolymer/graphene nanocomposites: Tuning the morphology and dielectric properties by graphene's surface polarity

2022 ◽  
Author(s):  
Milad Goodarzi ◽  
Gholamreza Pircheraghi ◽  
Hossein Ali Khonakdar ◽  
Volker Altstadt
Keyword(s):  
Dielectric Properties ◽  
Surface Polarity ◽  
Graphene Nanocomposites ◽  
High Dielectric

High dielectric properties, TiO2 nanoparticles doped PDLC devices for lower switching voltage

2021 ◽  
pp. 1-10
Author(s):  
Miaomiao Jia ◽  
Yuzhen Zhao ◽  
Hong Gao ◽  
Dong Wang ◽  
Zongcheng Miao ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Tio2 Nanoparticles ◽  
Switching Voltage ◽  
High Dielectric

New Perovskite Nanomaterials and Their Integrations into High-k Dielectrics

2011 ◽  
Vol 2011 (CICMT) ◽  
pp. 000072-000077
Author(s):  
Minoru Osada ◽  
Takayoshi Sasaki
Keyword(s):  
Dielectric Properties ◽  
Room Temperature ◽  
Bottom Electrode ◽  
Dielectric Constants ◽  
Dielectric Films ◽  
Layered Perovskite ◽  
Layer By Layer ◽  
High K ◽  
High K Dielectric ◽  
High Dielectric

We report on a bottom-up manufacturing for high-k dielectric films using a novel nanomaterial, namely, a perovskite nanosheet (LaNb2O7) derived from a layered perovskite by exfoliation. Solution-based layer-by-layer assembly of perovskite nanosheets is effective for room-temperature fabrication of high-k nanocapacitors, which are directly assembled on a SrRuO3 bottom electrode with an atomically sharp interface. These nanocapacitors exhibit high dielectric constants (k > 50) for thickness down to 5 nm while eliminating problems resulting from the size effect. We also investigate dielectric properties of perovskite nanosheets with different compositions (LaNb2O7, La0.95Eu0.05Nb2O7, and Eu0.56Ta2O7) in order to study the influence of A- and B-site modifications on dielectric properties.

Structure instability-induced high dielectric properties in [001]-oriented 0.68Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 crystals

2019 ◽  
Vol 28 (5) ◽  
pp. 057701
Author(s):  
Xiao-Juan Li ◽  
Xing Fan ◽  
Zeng-Zhe Xi ◽  
Peng Liu ◽  
Wei Long ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
High Dielectric

scholarly journals Fabrication of High Permittivity Resin Composite for Vat Photopolymerization 3D Printing: Morphology, Thermal, Dynamic Mechanical and Dielectric Properties

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3818 ◽  
Author(s):  
Malas ◽  
Isakov ◽  
Couling ◽  
Gibbons
Keyword(s):  
Dielectric Properties ◽  
3D Printing ◽  
Resin Composite ◽  
Ceramic Powder ◽  
Reactive Polymer ◽  
Calcium Copper Titanate ◽  
Double Function ◽  
High Dielectric ◽  
Powder Content ◽  
5 Ghz

The formulation of a high dielectric permittivity ceramic/polymer composite feedstock for daylight vat photopolymerization 3D printing (3DP) is demonstrated, targeting 3DP of devices for microwave and THz applications. The precursor is composed of a commercial visible light photo-reactive polymer (VIS-curable photopolymer) and dispersed titanium dioxide (TiO2, TO) ceramic nano-powder or calcium copper titanate (CCT) micro-powder. To provide consistent 3DP processing from the formulated feedstocks, the carefully chosen dispersant performed the double function of adjusting the overall viscosity of the photopolymer and provided good matrix-to-filler bonding. Depending on the ceramic powder content, the optimal viscosities for reproducible 3DP with resolution better than 100 µm were η(TO) = 1.20 ± 0.02 Pa.s and η (CCT) = 0.72 ± 0.05 Pa.s for 20% w/v TO/resin and 20% w/v CCT/resin composites at 0.1 s−1 respectively, thus showing a significant dependence of the “printability” on the dispersed particle sizes. The complex dielectric properties of the as-3D printed samples from pure commercial photopolymer and the bespoke ceramic/photopolymer mixes are investigated at 2.5 GHz, 5 GHz, and in the 12–18 GHz frequency range. The results show that the addition of 20% w/v of TO and CCT ceramic powder to the initial photopolymer increased the real part of the permittivity of the 3DP composites from ε’ = 2.7 ± 0.02 to ε’(TO) = 3.88 ± 0.02 and ε’(CCT) = 3.5 ± 0.02 respectively. The present work can be used as a guideline for high-resolution 3DP of structures possessing high-ε.

Thermally-stable high dielectric properties of (1–x)(0.65Bi1.05FeO3–0.35BaTiO3)–xBiGaO3 piezoceramics

2019 ◽  
Vol 39 (7) ◽  
pp. 2304-2309 ◽  
Author(s):  
Fazli Akram ◽  
Rizwan Ahmed Malik ◽  
Tae Kwon Song ◽  
Soonil Lee ◽  
Myong-Ho Kim
Keyword(s):  
Dielectric Properties ◽  
Thermally Stable ◽  
High Dielectric

Microstructure and Dielectric Properties of LixTixNi1-2xO Thin Films

2008 ◽  
Vol 368-372 ◽  
pp. 1817-1819
Author(s):  
Cui Hua Zhao ◽  
Bo Ping Zhang ◽  
Yong Liu ◽  
Song Jie Li
Keyword(s):  
Thin Films ◽  
Dielectric Properties ◽  
Spin Coating ◽  
Sol Gel ◽  
Dielectric Constants ◽  
Co Doping ◽  
Grain Sizes ◽  
Uniform Microstructure ◽  
Coating Method ◽  
High Dielectric

LixTixNi1-2xO (x =0, 10 and 20 at. %) thin films with 200 nm in thickness were deposited on Pt/Ti/SiO2/Si (100) by a sol-gel spin-coating method. All samples have a uniform microstructure. The grain sizes grew from 100 nm to 300 nm by co-doping Li and Ti. The LiTiNiO thin films consist of NiO, NiTiO3 and Li2NiO2, while the Li-free thin films consist of NiO, NiTiO3 and NiTi0.99O3. The dielectric properties of the LiTiNiO thin films improved obviously by co-doping Li and Ti, but excess Li increases the amount of Li2NiO2 phase and decreases the dielectric properties. The dielectric constants at 100 Hz for the Li0.1Ti0.1Ni0.8O and Li0.2Ti0.2Ni0.6O thin films are 506 and 388 respectively. Appropriate co-doping contents of Li and Ti are important to obtain a high dielectric property.

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