Sintered silicon nitride/nano-silicon carbide materials based on preceramic polymers and ceramic powder

Degenhardt, Ulrich; Stegner, Frank; Liebscher, Christian; Glatzel, Uwe; Berroth, Karl; Krenkel, Walter; Motz, Günter

doi:10.1016/j.jeurceramsoc.2011.09.007

Cited by 16 publications

(11 citation statements)

References 24 publications

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“…The Raman spectra from sample Si-3 contained the same lines and three additional broad lines around 400-450, 480-490, and 600-620 cm −1 . While 480-490 cm −1 line could be attributed to amorphous Si [36], the bands at 400-450 and 600-620 cm -1 looked close to the S-N vibration frequencies [37,38]. Note that the observed high level of noise for the Raman spectrum for Si-3 sample could be explained by the PL background.…”

Section: Notation Ofmentioning

confidence: 83%

“…In contrast, the "green-yellow" PL band from Si-3 sample (black line) was characterized by faster PL transient, which could be extrapolated by a power-law decay but with an exponent of about 1.25. The faster PL decay for sample Si-3 could be explained by a higher rate of the radiative recombination between localized electronic states in a-SiN x O y coating of Si-NCs similarly to the fast PL decay in a-SiN x O y films grown by PECVD [37]. As a conclusion, the observed "red" band could be attributed to the confined excitonic states in Si nanocrystals-QDs, while the "green-yellow" band with higher relative intensity was related to local electronic states in a-SiN x O y coating of Si-QDs due to specific nitrogen-based passivation.…”

Section: Notation Ofmentioning

confidence: 90%

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Tailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures

et al. 2020

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Using methods of pulsed laser ablation from a silicon target in helium (He)-nitrogen (N2) gas mixtures maintained at reduced pressures (0.5–5 Torr), we fabricated substrate-supported silicon (Si) nanocrystal-based films exhibiting a strong photoluminescence (PL) emission, which depended on the He/N2 ratio. We show that, in the case of ablation in pure He gas, Si nanocrystals exhibit PL bands centered in the “red - near infrared” (maximum at 760 nm) and “green” (centered at 550 nm) spectral regions, which can be attributed to quantum-confined excitonic states in small Si nanocrystals and to local electronic states in amorphous silicon suboxide (a-SiOx) coating, respectively, while the addition of N2 leads to the generation of an intense “green-yellow” PL band centered at 580 nm. The origin of the latter band is attributed to a radiative recombination in amorphous oxynitride (a-SiNxOy) coating of Si nanocrystals. PL transients of Si nanocrystals with SiOx and a-SiNxOy coatings demonstrate nonexponential decays in the micro- and submicrosecond time scales with rates depending on nitrogen content in the mixture. After milling by ultrasound and dispersing in water, Si nanocrystals can be used as efficient non-toxic markers for bioimaging, while the observed spectral tailoring effect makes possible an adjustment of the PL emission of such markers to a concrete bioimaging task.

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Section: Notation Ofmentioning

confidence: 83%

Section: Notation Ofmentioning

confidence: 90%

Tailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures

et al. 2020

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“…Silicon carbonitride (SiCN) derived from polysilazane possesses the outstanding properties including thermal stability, high mechanical strength, and excellent fracture toughness, which shows great potential for high temperature and structure applications [153,154]. In general, amorphous SiCN ceramics can be obtained at 1000 ℃, which are transferred into SiC and Si 3 N 4 phases with free carbon at a higher temperature, and then β-SiC could be formed from the reaction between Si 3 N 4 and free carbon over 1800 ℃ [73,[147][148][149][150].…”

Section: Wwwspringercom/journal/40145mentioning

confidence: 99%

“…The polysilanes were used as SiC precursors, while Si 3 N 4 powders acted as inert fillers to obtain SiC/Si 3 N 4 composite, which showed well-defined open-cell structures with macro struts. Similarly, Degenhardt et al [154] reported a method to fabricate porous SiCN ceramics by using polycarbosilazane as precursors and Si 3 N 4 powders as inert fillers. After pyrolysis at 1000 ℃, SiCN partially filled the interstices between the inert Si 3 N 4 , and thus porous SiCN/Si 3 N 4 ceramics with about 34% porosity were obtained.…”

Section: Wwwspringercom/journal/40145mentioning

confidence: 99%

Organosilicon polymer-derived ceramics: An overview

Zhu

2019

J Adv Ceram

142

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Polymer-derived ceramics (PDCs) strategy shows a great deal of advantages for the fabrication of advanced ceramics. Organosilicon polymers facilitate the shaping process and different silicon-based ceramics with controllable components can be fabricated by modifying organosilicon polymers or adding fillers. It is worth noting that silicate ceramics can also be fabricated from organosilicon polymers by the introduction of active fillers, which could react with the produced silica during pyrolysis. The organosilicon polymer-derived ceramics show many unique properties, which have attracted many attentions in various fields. This review summarizes the typical organosilicon polymers and the processing of organosilicon polymers to fabricate silicon-based ceramics, especially highlights the three-dimensional (3D) printing technique for shaping the organosilicon polymerderived ceramics, which makes the possibility to fabricate silicon-based ceramics with complex structure. More importantly, the recent studies on fabricating typical non-oxide and silicate ceramics derived from organosilicon polymers and their biomedical applications are highlighted.

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“…However, carbon can also be incorporated directly into the polymer chain itself. For example ammonolysis of bis(dichloroalkylsilyl)ethane leads to a polysilazane incorporating ethyl groups that has been used as the binder in production of Si3N4/SiC composites from Si3N4 powder [126] and also with BN, ZrO2 or glass powder filler to produce composite coatings with hardness values up to 13 GPa [51]:…”

Section: Preceramic Polymers With a Si-c-n Backbonementioning

confidence: 99%

Synthesis and processing of silicon nitride and related materials using preceramic polymer and non-oxide sol-gel approaches

Hector

2016

Coordination Chemistry Reviews

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The use of preceramic polymer and sol-gel processing methods in the production of silicon nitride and a number of related materials is reviewed. Amorphous ceramics in this system, that may contain additional carbon, boron and other elements, have a number of promising and/or useful high temperature properties. These include good mechanical properties and oxidation resistance at temperatures that can exceed 1500 °C with some materials, but also useful charge storage capability, catalytic activity and semiconducting or optical properties after doping.

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Sintered silicon nitride/nano-silicon carbide materials based on preceramic polymers and ceramic powder

Cited by 16 publications

References 24 publications

Tailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures

Tailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures

Organosilicon polymer-derived ceramics: An overview

Synthesis and processing of silicon nitride and related materials using preceramic polymer and non-oxide sol-gel approaches

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