Novel high dielectric constant and low loss PTFE/CNT composites

Peng, Haiyi; Ren, Haishen; Dang, Mingzhao; Zhang, Yi; Yao, Xiaogang; Lin, Huixing

doi:10.1016/j.ceramint.2018.06.077

Cited by 53 publications

(24 citation statements)

References 18 publications

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“…Figure 10(c) shows the EMT model matches the experimental dielectric constant well and the same conclusion was also obtained in Ref. [8].…”

Section: Dielectric Propertiessupporting

confidence: 84%

“…The (Na 0.6 Li 0.4 ) 0.5 Nd 0.5 TiO 3 and glass fiber were filled into PTFE matrix to fabricate composite substrate, and the composites showed the best dielectric properties: ε = 10.4, tanδ = 0.0026 (10 GHz), and excellent τ ε = -0.9 ppm/℃ when the weight fraction of fillers was 60 wt% [7]. PTFE/Ca 0.55 Nd 0.3 TiO 3 (CNT) composites possessed the best dielectric properties: ε = 12, and low tanδ = 0.00085 (10 GHz) at 50 vol% filler contents; the PTFE/Ba(Mg 1/3 Ta 2/3 )O 3 composite exhibited the dielectric properties: ε = 6.7, tanδ = 0.003 (X-band) when the weight fraction of particles was 76 wt%, but the τ ε of both composites were not studied [8,9]. The ε, tanδ, and τ ε have always been the key properties for substrate materials.…”

Section: Introduction mentioning

confidence: 99%

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Surface-modified Zn0.5Ti0.5NbO4 particles filled polytetrafluoroethylene composite with extremely low dielectric loss and stable temperature dependence

et al. 2020

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Polymer-ceramic composites are widely applied in microwave substrate materials due to the excellent dielectric properties and simple preparation process recently. Polytetrafluoroethylene-based (PTFE) composites filled with Zn0.5Ti0.5NbO4 (ZTN) ceramic particles were fabricated by hot-pressing. The particles were modified by C14H19F13O3Si to enhance the interface compatibility between PTFE and ZTN powders, which was characterized by X-ray photoelectron spectroscopy (XPS) and contact angle. The surface characteristic of particles transformed into hydrophobicity and tight microstructure as well as better dielectric properties were obtained after the surface modification. The microstructure, dielectric, thermal, mechanical properties, and water absorption of the composites concerning ZTN content were investigated. Modified ZTN/PTFE composites with 50 vol% ZTN particles exhibit excellent dielectric properties with a high dielectric constant of 8.3, an extremely low dielectric loss of 0.00055 at 7 GHz, and a stable temperature coefficient of the dielectric constant of −12.2 ppm/°C. All the properties show modified ZTN particles filled PTFE composite is the potential material for microwave substrate application.

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“…Figure 10(c) shows the EMT model matches the experimental dielectric constant well and the same conclusion was also obtained in Ref. [8].…”

Section: Dielectric Propertiessupporting

confidence: 84%

Section: Introduction mentioning

confidence: 99%

Surface-modified Zn0.5Ti0.5NbO4 particles filled polytetrafluoroethylene composite with extremely low dielectric loss and stable temperature dependence

et al. 2020

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“…The electroceramics emerged as an excellent option for integration and miniaturization of electronic circuits, making smaller and more efficient systems [1]. Due to the advances in telecommunications, it is required that the materials have appropriated dielectric constant (ε r ), low dielectric loss (tan δ), near-zero temperature coefficient of resonant frequency (τ f ), highquality factor (Q x f), temperature stable and versatile [2,3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Bi2O3-B2O3 as a Sintering aid in Microstructure and Dielectric Properties of Fe2Mo3O12 Electroceramic.

Araújo¹,

Silva²,

Pereira³

et al. 2020

Preprint

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Molybdates from A2Mo3O12 family have been widely investigated due to its low sintering temperature, low thermal expansion coefficient, and low dielectric loss. Fe2Mo3O12 (FMO) is an oxide from this family and widely used in the catalytic field. The aim of this work is to evaluate the influence of the Bi2O3-B2O3 as a sintering aid in the microstructure and dielectric properties of FMO. The diffraction results showed that the FMO with the monoclinic structure phase was obtained after the calcination process (650 °C). Mössbauer spectroscopy showed the formation of Fe2O3 after the sintering process at 800 °C. The scanning electron-microscopic demonstrates an increase of the grain as a function of sintering aid concentration. The samples were analyzed by using the impedance spectroscopy at radiofrequency with temperature variation. The Nyquist diagram obtained in this temperature range was fitted from an equivalent circuit with three R-CPE associations, corresponding to the morphology of the electroceramics. For dielectric properties in the microwave, all the samples showed values of εr lower than 10. Values of Q x f above 14132.35 GHz were achieved. The thermal stability was evaluated by the temperature coefficient of resonant frequency (τf). The lowest τf values of -6.55 ppm/°C and -4.35 ppm/°C (near-zero) were measured to FMO and FMO mixed with 7.5 wt% Bi2O3-B2O3, respectively. Based on these results, FMO can be used to low permittivity ceramic for low temperature co-fired ceramics (LTCC) applications, antenna substrate, and millimeter-wave range.

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“…For the past decades, there have been great efforts to focus on the study of low dielectric constant (2–5) and high dielectric constant (>8) PTFE‐based composites substrates . Luo et al .…”

Section: Introductionmentioning

confidence: 99%

“…reported that PTFE/Mg 2 SiO 4 composites with 50 vol % filler content has the dielectric constant of 3.2 and loss tangent 0.009 at 5 GHz . In Peng's studies, the high dielectric constant of 12 and dielectric loss of 8.5 × 10 −4 (at 10 GHz) were obtained for the PTFE composite with 50 wt % Ca 0.55 Nd 0.3 TiO 3 . Comparatively, substrate materials with the medium dielectric constant (5–8) have not been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles

Wang

Tong³

et al. 2019

J of Applied Polymer Sci

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In this work, we presented a simple strategy to fabricate medium dielectric constant and low-loss composites for microwave substrate applications. MgO-LiF co-doped Li 2 TiO 3 (LT) powders were fabricated by the solid-state reaction route and modified by perfluorooctyltriethoxysilane (F8261). The LT/polytetrafluoroethylene (PTFE) composites were fabricated by cold pressing and hot treatment. The XPS and contact angle analysis indicated that the fluorinated group was introduced to LT particle successfully. The effects of modified LT powders content on the dielectric, thermal, and mechanical properties of composites were investigated. As the modified LT content increases, the dielectric constant, dielectric loss, and temperature coefficient of dielectric constant (τ ε ) increase while the bending strength and coefficient of thermal expansion (CTE) decrease, which is attributed to the higher dielectric constant of LT ceramic, more pores, stable τ ε of LT ceramic, interface defects and low CTE of LT ceramic, respectively. The composites with 60 wt % LT exhibit the best microwave dielectric properties: ε r = 6.8, tanδ = 0.001, τ ε = −29.6 ppm C −1 at 8 GHz and acceptable coefficient of thermal expansion (28.3 ppm C −1 ). Therefore, modified LT powders filled PTFE composites are potential materials for high-frequency microwave substrate applications.

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Novel high dielectric constant and low loss PTFE/CNT composites

Cited by 53 publications

References 18 publications

Surface-modified Zn0.5Ti0.5NbO4 particles filled polytetrafluoroethylene composite with extremely low dielectric loss and stable temperature dependence

Surface-modified Zn0.5Ti0.5NbO4 particles filled polytetrafluoroethylene composite with extremely low dielectric loss and stable temperature dependence

Effect of Bi2O3-B2O3 as a Sintering aid in Microstructure and Dielectric Properties of Fe2Mo3O12 Electroceramic.

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles

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Novel high dielectric constant and low loss PTFE/CNT composites

Cited by 53 publications

References 18 publications

Surface-modified Zn0.5Ti0.5NbO4 particles filled polytetrafluoroethylene composite with extremely low dielectric loss and stable temperature dependence

Surface-modified Zn0.5Ti0.5NbO4 particles filled polytetrafluoroethylene composite with extremely low dielectric loss and stable temperature dependence

Effect of Bi2O3-B2O3 as a Sintering aid in Microstructure and Dielectric Properties of Fe2Mo3O12 Electroceramic.

Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li2TiO3 particles

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Product

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Medium dielectric constant and low‐loss PTFE composites filled with MgO‐LiF co‐doped Li₂TiO₃ particles