Influence of activated charcoal on the structural and morphological characteristics of ceramic based on silicon oxycarbide (SiOC): A promising approach to obtain a new electrochemical sensing platform

Godoy, Naiara Vieira; Pereira, Jaqueline Laís; Duarte, Eduardo Henrique; Tarley, César Ricardo Teixeira; Segatelli, Mariana Gava

doi:10.1016/j.matchemphys.2016.02.031

Cited by 15 publications

(3 citation statements)

References 62 publications

(83 reference statements)

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“…The presence of the turbostratic graphene could be observed as straight grid lines (seen within yellow rectangles) in the HR-TEM as seen in Fig. 3(c) 21 . The arrows in indigo indicate the amorphous silicon oxycarbide matrix and the rectangle in blue (Fig.…”

Section: Resultsmentioning

confidence: 84%

Graphene nanoplatelets as nanofillers in mesoporous silicon oxycarbide polymer derived ceramics

Sujith

Chauhan

Gangadhar

et al. 2018

Sci Rep

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Understanding the role of graphene in the thermal stability and pore morphology of polymer derived silicon oxycarbide is crucial for electrochemical energy storage and hydrogen storage applications. Here in this work, we report the synthesis of graphene nanoplatelets dispersed silicon oxycarbide ceramics by the polymer to ceramic synthesis route. Samples containing graphene and without graphene are subjected to different pyrolysis conditions and are characterized using FT-IR, XPS, Raman spectroscopy, XRD, FE-SEM, HR-TEM, and BET. The results show that the graphene dispersed in the ceramic has undergone structural distortions upon pyrolysis and resulted in the formation of nanoclusters of graphene and turbostratic graphene. The XRD results confirm that with the incorporation of higher wt.% of GNP there is resistance to crystallization even at an exceedingly high pyrolysis temperature. The pores are bimodal in nature with specific surface area ranging between 22 and 70 m2/g and are generated in-situ during the polymer to ceramic conversion. Our study confirms that upon adjusting the graphene content it is possible to tune the structure and pore morphology of the polymer derived ceramics as per the requirements.

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Section: Resultsmentioning

confidence: 84%

Graphene nanoplatelets as nanofillers in mesoporous silicon oxycarbide polymer derived ceramics

Sujith

Chauhan

Gangadhar

et al. 2018

Sci Rep

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“…However, due to the relatively small amount of carbon in the polysiloxane, it is difficult to remove oxygen from the produced ceramics while providing a good SiC yield. The method to achieve this goal by other researchers was the introduction of various forms of carbon, such as charcoal [ 40 ], anthracite or graphite [ 27 ], carbon black or phenol resin [ 31 , 33 ], to the precursor. In our research, additional carbon was introduced to this material through the use of a large amount of a cross-linking agent, which was divinyl benzene (DVB).…”

Section: Resultsmentioning

confidence: 99%

Porous SiC and SiC/Cf Ceramic Microspheres Derived from Polyhydromethylsiloxane by Carbothermal Reduction

et al. 2021

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A simple and inexpensive method for the preparation of porous SiC microspheres is presented. Polysiloxane microspheres derived from polyhydromethylsiloxane (PHMS) cross-linked with divinylbenzene (DVB) were ceramized under conditions leading to the removal of oxygen from the material. The content of free carbon (Cf) in highly crystalline silicon carbide (SiC) particles can be controlled by using various proportions of DVB in the synthesis of the pre-ceramic material. The chemical structure of the ceramic microspheres was studied by elemental analysis for carbon and oxygen, 29Si MAS NMR, 13C MAS NMR, SEM/EDS, XRD and Raman spectroscopies, and their morphology by SEM, nitrogen adsorption and mercury intrusion porosimetries. The gaseous products of the thermal reduction processes formed during ceramization created a porous structure of the microspheres. In the SiC/Cf microspheres, meso/micro pores were formed, while in carbon-free SiC, microspheres macroporosity dominated.

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“…Thus, the tips consist of iron and silicon. The carbothermal reduction of silica takes place at temperatures 1200-1600 °C producing SiO and CO gaseous products and silicon carbide amorphous and crystalline phases [29,[31][32][33]. X-ray diffraction pattern of particles heated at 1400 °C is displayed in Fig.…”

Section: Preparation and Studies Of Ceramic Particlesmentioning

confidence: 99%

Polysiloxane Derived Macroporous Silicon Oxycarbide Microspheroidal Particles and Their Decoration with 1D Structures

Fortuniak

Chojnowski

Mizerska

et al. 2020

J Inorg Organomet Polym

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A simple method of synthesis for the macroporous SiOC spheroidal microparticles was developed. Preceramic polysiloxane macroporous microbeads were obtained by a one-step aqueous emulsion process involving poly(hydromethylsiloxane) (PHMS) with the addition of FeCl 3 ·6H 2 O. Thermal treatment of these particles gave various SiOC materials depending on the pyrolysis temperature. Hierarchically porous spheroidal mezo-macroporous ceramers were obtained at 600 °C. Heating at 850-1000 °C gave SiOC ceramic spheroidal particles with about 60% open porosity. Ceramization at 1200-1400 °C led to the particles decorated with ceramic whiskers and wires. Heating at 1600 °C gave wires and spilled ceramic particles. These 1D ceramic structures were formed by a Vapor-Liquid-Solid (VLS) mechanism.

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Influence of activated charcoal on the structural and morphological characteristics of ceramic based on silicon oxycarbide (SiOC): A promising approach to obtain a new electrochemical sensing platform

Cited by 15 publications

References 62 publications

Graphene nanoplatelets as nanofillers in mesoporous silicon oxycarbide polymer derived ceramics

Graphene nanoplatelets as nanofillers in mesoporous silicon oxycarbide polymer derived ceramics

Porous SiC and SiC/Cf Ceramic Microspheres Derived from Polyhydromethylsiloxane by Carbothermal Reduction

Polysiloxane Derived Macroporous Silicon Oxycarbide Microspheroidal Particles and Their Decoration with 1D Structures

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