JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 14
·18591-18604
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IF 2.478
Zhang Shengsheng,Huang Fanglin,Zhong Mingqiang,Fan Ping
Dielectric material is an important material for film capacitors. However, the progress of this material is either impeded by its low dielectric constant, high loss tangent, or insufficient flexibility. In this work, PVA/GO film with alternating layer structure was fabricated by Spin-Coating-Assembly (SCA) method. This alternating layer structure not only benefits forming numerous microscale capacitors which improve ε value a lot, but also helps eliminate perpendicular contact of GO and prevents the formation of conductive pathways. Thus, compared with pure PVA, significantly increased dielectric permittivity and a low loss tangent were simultaneously observed for the PVA/GO film. The ratio of dielectric permittivity to loss tangent increased from 68 to 165. These films might be potential flexible dielectric materials for advanced electrical devices such as embedded capacitors.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2013
·
IF 3.328
Xinzhou Wu,Zheng Chen,Zheng Cui
Albumen and BaTiO 3 nanoparticles are employed to make solution processable nanocomposite for high permittivity films. The nanoparticles are modified with poly(acrylic acid) molecules to achieve homogeneous dispersion in albumen aqueous solution and made into films by drop casting. The dielectric constant and loss tangent of albumen–BaTiO 3 nanocomposites are investigated as the function of volume fraction of BaTiO 3 . The nanocomposites exhibit maximum relative permittivity of 52 and good dielectric stability over a wide range of frequency, while the loss tangent is below 0.05 even at high BaTiO 3 loading of 80 vol%. The dielectric constants of nanocomposites with lower volume fractions (<41 vol%) are in good agreement with the Lichtenecker-Logarithmic model.
研究领域:
材料科学
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生物材料
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 17
·12931-12939
·
IF 4.6
Hui Xu,Fengqi Qiu,Weishuai Han,Jinwei Liu,Zhenhua Xue
To investigate the relationship between the degree of surface oxidation of delignification materials and their dielectric properties, sodium periodate was used to oxidize the delignification samples of Pinus sylvestris var. Mongolia and Paulownia fortunei (Seem.) Hemsl. The degree of oxidation was reflected by the degree of substitution of aldehyde and carboxyl groups at a specific reaction time interval, and then the dielectric constant and dielectric loss tangent were measured. The results show that with the increase of oxidation time, the crystallinity decreases and the hydrogen bond network is weakened. In the frequency range of 103–107 Hz, the dielectric constant of the sample decreases with the increase of frequency and tends to be stable near 10 MHz, but the dielectric constant of the oxide material is significantly higher than that of the untreated material. At the same time, the dielectric constant increases with the increase of oxidation time, while the dielectric loss tangent decreases.
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Leyi Zhang,Xiao Zhao,Yaling Ma,Yu Shu,Rao Zhang,Jianyong Xiang,Bochong Wang,Congpu Mu,Kun Zhai,Tianyu Xue,Fusheng Wen
In this study, the TBG composites (composites of tellurium doped black phosphorus nanoflakes (Te/BP NFs) with graphite nanoflakes (GNFs)) were successfully prepared which showed excellent electromagnetic wave absorption performance. The permittivity and dielectric loss tangent of TBG composites increased with the increase of GNFs content. When the ratio of Te/BP NFs to GNFs was 1:1 (TBG-1–1 composite), the reflection loss reached −10 dB under the thickness range of 1–3 mm and frequency range of 5.25–18 GHz, and the minimum reflection loss was −31.07 dB at the frequency of 4.14 GHz. Moreover, the relationship between minimum reflection loss frequency and thickness of TBG-1–1 composite conformed to the λ/4 impedance matching model. Therefore, the TBG composites have great potential in the application of high-frequency electromagnetic wave fields.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2016
·
IF 3.85
Chen Pan,Kaichang Kou,Qian Jia,Yu Zhang,Guanglei Wu,Tiezheng Ji
To achieve polymer-based composites for electronic packaging with low dielectric constant, low dielectric loss tangent and high thermal conductivity , silane coupling agent KH550 modified hexagonal boron nitride (hBN) platelets were introduced into PTFE matrix via a cold pressing and sintering method. The effect of surface treatment on the morphology, thermal conductivity and dielectric properties of the composites was investigated. The results revealed that after surface treatment, the interfacial adhension between hBN platelets and PTFE matrix was improved and the in-plane orientation degree of hBN platelets in PTFE matrix decreased, which effectively improvd the thermal conductivity of the composites. The thermal conductivity of hBN-KH550/PTFE composite with 30 vol% filler content is 0.722 W/mK, which is 2.7 folds of pure PTFE. Moreover, the enhanced interfacial adhension and reduced surface hydrophilicity of hBN platelets significantly decreased the interfacial polarization , resulting in not only lower dielectric constant and dielectric loss tangent but also weaker frequency-dependence.
研究领域:
材料科学
·
复合材料
·
电子封装
·
热管理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）