Low dielectric constant porous BN/SiCO made by pyrolysis of filled gels

Valentinotti, Manuela; Walter, Steffen; Modena, Stefano; Sorarù, Gian Domenico

doi:10.1016/j.jeurceramsoc.2006.08.015

Cited by 12 publications

(14 citation statements)

References 15 publications

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“…31 Accordingly, in the present study, the chemical analysis, CA, has been performed only on the SiOC and SiBOC samples pyrolyzed at 1400 °C for 1 h and gave the following results (wt %): Si ) 46. 18 for SiCO and SiBOC respectively. The B content was found close to the theoretical value (B/Si ) 0.2).…”

Section: Characterization Of Sioc and Siboc Glasses (Before Etching) ...mentioning

confidence: 99%

“…12 Moreover, PDCs have shown unique properties, such as high-temperature stability, 13 creep, [14][15] and oxidation resistance. [16][17] Functional properties such as low dielectric constant, 18 photoluminescence, 19 and electrical conductivity [20][21] have also been reported. The structure of silicon oxycarbide glasses has been the focus of many studies.…”

Section: Introductionmentioning

confidence: 97%

“…This process has a highly shaping flexibility that allows the fabrication of a many different components: bulks, − fibers, − films, foams, and MEMS . Moreover, PDCs have shown unique properties, such as high-temperature stability, creep, − and oxidation resistance. − Functional properties such as low dielectric constant, photoluminescence, and electrical conductivity 20-21 have also been reported.…”

Section: Introductionmentioning

confidence: 99%

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New Insights on the High-Temperature Nanostructure Evolution of SiOC and B-Doped SiBOC Polymer-Derived Glasses

et al. 2007

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SiOC and SiBOC polymer-derived glasses show a complex nanostructure in which nanocrystalline β-SiC and sp 2 C coexists with nanoclusters of amorphous SiO 2 or SiO 2 -B 2 O 3 and with mixed silicon oxycarbide and boron oxycarbide units. The characterization of the nanostructure is performed with a multiple technique approach on SiOC and SiBOC glasses before and after HF etching. The acid attack dissolves the silica-based nanoclusters and allows indirect information on their size and amount to be obtained. By increasing the pyrolysis temperature from 1200 up to 1500 °C the oxide clusters grow in size and amount in both SiOC and SiBOC glasses. Compared to the B-free SiOC glass, SiBOC is more easily etched and develops higher porosity and larger pore size. Boron has also an important effect on the ordering of the sp 2 C phase: it leads to thicker sp 2 C nanocrystals. This effect is remarkable because it starts at low temperature (1500 °C) compared to the usual temperature, 1800 °C, reported in the literature for different forms of nanocrystalline carbon. Raman analysis of SiBOC glasses pyrolyzed at 1500 °C clearly shows the presence of the D′ band at 1617 cm -1 . From this experimental result it is postulated that B enters into the graphene layers forming BC 3 units. Finally, the shift toward lower wavenumbers of the Raman spectra recorded on SiOC and SiBOC glasses after etching seems to reveal a high compressive stress acting along the basal sp 2 C planes of the graphite nanocrystals.

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Section: Characterization Of Sioc and Siboc Glasses (Before Etching) ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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New Insights on the High-Temperature Nanostructure Evolution of SiOC and B-Doped SiBOC Polymer-Derived Glasses

et al. 2007

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“…The ε r of all XNBR composites are lower than that of pure XNBR, which is attributed to the lower ε r (about 4.40) of BN platelets compared with that for XNBR (ε r = 12.86 at 1 Hz). 43,44 For instance, the ε r of 20 vol % BN-TA-XNBR composite is 9.19 at 10 3 Hz, while that for pure XNBR is just 10.56 at the same frequency. Moreover, the BN-TA-XNBR composites exhibit higher ε r in comparison with BN-XNBR composites at the same frequency.…”

Section: Resultsmentioning

confidence: 98%

Improved Thermal Conductivity of Polymer Composites by Noncovalent Modification of Boron Nitride via Tannic Acid Chemistry

Gao

Yang

et al. 2021

Ind. Eng. Chem. Res.

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With the advent of the 5G era, hexagonal boron nitride (BN) platelets are ideal fillers to incorporate into polymers for preparing thermally conductive composites, which are applied in relieving the heat dissipation in electronic devices. In this study, we report a green, low cost, and high-efficient method to improve the thermal conductivity (λ) of carboxylated acrylonitrile-butadiene rubber (XNBR) composites via noncovalent modification of boron nitride (BN) via tannic acid (TA) chemistry. The noncovalent TA decorating on the surface of BN without deteriorating the surface structure of BN platelets ensures the high intrinsic λ of BN. Additionally, TA enhances the interfacial compatibility between the filler and matrix, as well as the formation of a thermally conductive path in the composites. The maximum throughplane λ is obtained by 30 vol % BN-TA-XNBR composite as 0.42 W/mK, which is 260% of that for pure XNBR (0.16 W/mK). The excellent dielectric properties of BN-TA-XNBR composites also indicates that the BN-TA-XNBR composites can meet the requirements of high capacitance and low energy loss of electronic devices. In brief, the TA chemistry provides potential applications in large scale production of thermally conductive composites in industries, as well as paves the way for advanced applications in nextgeneration miniaturization and integration of electronic devices.

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“…This is attributed to the high amount of pores and BN content. BN phase has a low‐dielectric constant and the pores can also be looked as a second phase with very low dielectric constant 36–39 . Based on the mixture rule, 40 the higher content of low‐dielectric phases in the matrix, the lower dielectric constant of the composite is achieved.…”

Section: Resultsmentioning

confidence: 99%

Properties of Porous Si₃N₄/BN Composites Fabricated by RBSN Technique

Liu

Yuan

Zhang

et al. 2010

Int J Applied Ceramic Tech

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Reaction bonding of silicon nitride (RBSN) technique combined with slip-casting shaping process was used to fabricate porous Si 3 N 4 /BN ceramic composites. Si/BN slurry with chemical stability, good dispersibility, and viscosity was prepared using glycerol trioleate (GTO) covering on Si surface and poly(acrylic acid) (PAA) as dispersant. The hydrolysis of Si was strongly prevented by GTO coating. The dispersibility of covered Si and BN suspensions were improved by PAA dispersant. Twenty volume percent Int.covered Si/BN slurries with low viscosity were successfully casted. The cast bodies were dried at room temperature, debindered at 7501C and nitrided below 14501C. The nitrided samples mainly consist of a-Si 3 N 4 , b-Si 3 N 4 , and h-BN. The composites exhibit homogeneous microstructure consisting of faceted particles, a-Si 3 N 4 nanowires and a large amount of pores. The porosity is 52.64% and the pore size is in the range of 60-300 nm. The composites show compressive strength of 16.671.5 MPa. The dielectric constant of the composite is about 3.1 and the dielectric loss is below 0.5% under different frequencies.GTO, glycerol trioleate; PAA, poly(acrylic acid).

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Low dielectric constant porous BN/SiCO made by pyrolysis of filled gels

Cited by 12 publications

References 15 publications

New Insights on the High-Temperature Nanostructure Evolution of SiOC and B-Doped SiBOC Polymer-Derived Glasses

New Insights on the High-Temperature Nanostructure Evolution of SiOC and B-Doped SiBOC Polymer-Derived Glasses

Improved Thermal Conductivity of Polymer Composites by Noncovalent Modification of Boron Nitride via Tannic Acid Chemistry

Properties of Porous Si₃N₄/BN Composites Fabricated by RBSN Technique

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Low dielectric constant porous BN/SiCO made by pyrolysis of filled gels

Cited by 12 publications

References 15 publications

New Insights on the High-Temperature Nanostructure Evolution of SiOC and B-Doped SiBOC Polymer-Derived Glasses

New Insights on the High-Temperature Nanostructure Evolution of SiOC and B-Doped SiBOC Polymer-Derived Glasses

Improved Thermal Conductivity of Polymer Composites by Noncovalent Modification of Boron Nitride via Tannic Acid Chemistry

Properties of Porous Si3N4/BN Composites Fabricated by RBSN Technique

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Properties of Porous Si₃N₄/BN Composites Fabricated by RBSN Technique