Influence of carbon enrichment on electrical conductivity and processing of polycarbosilane derived ceramic for MEMS applications

Dalcanale, Federico; Grossenbacher, Jonas; Blugan, Gurdial; Gullo, Maurizio R.; Lauria, A.; Brugger, Jürgen; Tevaearai, Hendrik T.; Graule, Thomas; Niederberger, Markus; Kuebler, Jakob

doi:10.1016/j.jeurceramsoc.2014.06.002

Cited by 60 publications

(59 citation statements)

References 42 publications

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“…In summary, the results clearly indicate that the electrocatalytic performance of the novel NP/C/SiC nanocomposites catalyst can be enhanced via the addition of DVB as an additional carbon source due to the following two contributions: (a) the increase in free carbon with the form as graphite‐like carbon and turbostratic carbon (as proofed by the XRD, Raman spectra and TEM results) improves the overall electronic conductivity of the nanocomposites; (b) the enhanced carbothermal reaction increases the SSA (265.1 m 2 /g) at higher temperatures, which enables the formation of additional active sites of the MoSiC electrocatalysts. Moreover the obtained low overpotential of η 10 (119 mV) is excellent if compared with that of Mo‐related HER catalysts reported in the literature (Table ).…”

Section: Resultsmentioning

confidence: 76%

“…As reported, carbon is the main conductive phase in PDCs and when it forms a continuous network the conductivity significantly increases beyond the percolation threshold . The amount of carbon can be increased by bonding additional hydrocarbons to the preceramic polymer . Therefore, divinylbenzene (DVB) has been used as cross‐linking agent in PDCs to fabricate porous ceramics with high carbon content …”

Section: Introductionmentioning

confidence: 99%

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Enhanced hydrogen evolution reaction catalyzed by carbon‐rich Mo_4.8Si₃C_0.6/C/SiC nanocomposites via a PDC approach

Feng

Riedel

2019

J Am Ceram Soc

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In this study, mesoporous carbon‐rich Mo4.8Si3C0.6/C/SiC ceramic nanocomposites were successfully prepared via a single‐source precursor route, starting from allylhydridopolycarbosilane (AHPCS, SMP‐10), bis(acetylacetonato) dioxomolybdenum (VI) [MoO2(acac)2], and divinylbenzene (DVB). Besides, polystyrene (PS) was used as a pore former. The obtained carbon‐rich single‐source precursor/PS mixtures were pyrolyzed at 1100°C, and then annealed at 1350°C‐1600°C to fabricate a series of carbon‐rich Mo4.8Si3C0.6/C/SiC ceramics comprised of high carbon content above 50 wt%. In comparison to the carbon‐poor materials, the carbon‐rich samples retain the higher specific surface area up to 214.6‐304 m2/g at higher annealing temperatures (1350°C‐1600°C) due to the enhancement of carbothermal reaction. The carbon‐rich samples synthesized at 1500°C, denoted as SM/Mo/PS/DVB 2‐1‐4‐2 1500 exhibit enhanced electrocatalytic performance with ultra‐low overpotentials of 119 mV vs reversible hydrogen electrode at a current density of 10 mA cm−2 in acidic media, which is superior to that of the Mo4.8Si3C0.6/C/SiC ceramic (138 mV) with lower carbon content reported in our previous study. Therefore, our porous materials comprised of high carbon content and Nowotny phase (Mo4.8Si3C0.6, NP) are considered as promising catalysts for the hydrogen evolution reaction (HER).

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Section: Resultsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Enhanced hydrogen evolution reaction catalyzed by carbon‐rich Mo_4.8Si₃C_0.6/C/SiC nanocomposites via a PDC approach

Feng

Riedel

2019

J Am Ceram Soc

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“…Polymer‐derived ceramics (PDCs) were reported as being very attractive regarding tunability of their final properties, for example hardness, electrical conductivity, tribological properties and versatile manufacturing methods, an advantage for the shaping of the final product . Varieties of ceramic and metallic materials have already been deeply investigated for biocompatibility properties .…”

Section: Introductionmentioning

confidence: 99%

Cytotoxicity evaluation of polymer‐derived ceramics for pacemaker electrode applications

Grossenbacher

Gullo

Dalcanale

et al. 2015

J Biomedical Materials Res

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Ceramics are known to be chemically stable, and the possibility to electrically dope polymer-derived ceramics makes it a material of interest for implantable electrode applications. We investigated cytotoxic characteristics of four polymer-derived ceramic candidates with either electrically conductive or insulating properties. Cytotoxicity was assessed by culturing C2C12 myoblast cells under two conditions: by exposing them to material extracts and by putting them directly in contact with material samples. Cell spreading was optically evaluated by comparing microscope observations immediately after the materials insertion and after 24 h culturing. Cell viability (MTT) and mortality (LDH) were quantified after 24-h incubation in contact with the materials. Comparison was made with biocompatible positive references (alumina, platinum, biocompatible stainless steel 1.4435), negative references (latex, stainless steel 1.4301) and controls (no material present in the culture wells). We found that the cytotoxic properties of tested ceramics are comparable to established reference materials. These ceramics, which are reported to be very stable, can be microstructured and electrically doped to a wide range of conductivity and are thus excellent candidates for implantable electrode applications including pacemakers.

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“…In the study of the conduction behavior of PDCs, it has been found that the room temperature (RT) DC conductivity of the PDCs can be increased by 3‐4 orders of magnitude by increasing the pyrolysis temperature . Wang et al studied the effect of pyrolysis temperature (up to 1400°C) on the electrical conductivity (RT) of carbon‐rich amorphous PDC SiC and attributed the DC conductivity increase on the increase in carbon cluster size.…”

Section: Introductionmentioning

confidence: 99%

Semiconductor‐conductor transition of pristine polymer‐derived ceramics SiC pyrolyzed at temperature range from 1200°C to 1800°C

et al. 2019

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This paper studies the effect of pyrolysis temperature on the semiconductor-conductor transition of pristine polymer-derived ceramic silicon carbide (PDC SiC). A comprehensive study of microstructural evolution and conduction mechanism of PDC SiC pyrolyzed at the temperature range of 1200°C-1800°C is presented. At relatively lower pyrolysis temperatures (1200°C-1600°C), the carbon phase goes through a microstructural evolution from amorphous carbon to nanocrystalline carbon. The PDC SiC samples behave as a semiconductor and the electron transport is governed by the band tail hopping (BTH) mechanism in low pyrolysis temperature (1300°C); by a mixed mechanism driven by band tail hopping and tunneling at intermediate temperature (1500°C). At higher pyrolysis temperatures (1700°C-1800°C), a percolative network of continuous turbostratic carbon is formed up along the grain boundary of the crystallized SiC. The samples demonstrate metal-like conductive response and their resistivity increases monotonically with the increasing measuring temperature. K E Y W O R D Smetal-like conduction mechanism, pristine polymer derived ceramics, semiconductor-conductor transition, turbostratic carbon

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Influence of carbon enrichment on electrical conductivity and processing of polycarbosilane derived ceramic for MEMS applications

Cited by 60 publications

References 42 publications

Enhanced hydrogen evolution reaction catalyzed by carbon‐rich Mo_4.8Si₃C_0.6/C/SiC nanocomposites via a PDC approach

Enhanced hydrogen evolution reaction catalyzed by carbon‐rich Mo_4.8Si₃C_0.6/C/SiC nanocomposites via a PDC approach

Cytotoxicity evaluation of polymer‐derived ceramics for pacemaker electrode applications

Semiconductor‐conductor transition of pristine polymer‐derived ceramics SiC pyrolyzed at temperature range from 1200°C to 1800°C

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Influence of carbon enrichment on electrical conductivity and processing of polycarbosilane derived ceramic for MEMS applications

Cited by 60 publications

References 42 publications

Enhanced hydrogen evolution reaction catalyzed by carbon‐rich Mo4.8Si3C0.6/C/SiC nanocomposites via a PDC approach

Enhanced hydrogen evolution reaction catalyzed by carbon‐rich Mo4.8Si3C0.6/C/SiC nanocomposites via a PDC approach

Cytotoxicity evaluation of polymer‐derived ceramics for pacemaker electrode applications

Semiconductor‐conductor transition of pristine polymer‐derived ceramics SiC pyrolyzed at temperature range from 1200°C to 1800°C

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Enhanced hydrogen evolution reaction catalyzed by carbon‐rich Mo_4.8Si₃C_0.6/C/SiC nanocomposites via a PDC approach

Enhanced hydrogen evolution reaction catalyzed by carbon‐rich Mo_4.8Si₃C_0.6/C/SiC nanocomposites via a PDC approach