High-temperature stability and oxidation behavior of SiOC/HfO2 ceramic nanocomposite in air

Sun, Jia; Li, Tao; Reitz, Andreas; Fu, Qiangang; Riedel, Ralf; Yu, Zhaoju

doi:10.1016/j.corsci.2020.108866

Cited by 20 publications

(17 citation statements)

References 30 publications

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“…One reason why the initial temperature declines is that the introduction of Hf atoms reduces the thermal stability of Si-C bonds. 34,35 In the third stage, above 849.4 • C, the weight of modified microspheres remains the same until 1500 • C, and the DSC curve shows a more obvious endothermic peak at 1118 • C. In summary, the Hf-PSN microspheres have a significantly higher ceramic yield than unmodified microspheres. It is suggested that the introduction of Hf may improve the ceramic yield by suppressing the decomposition of the Si-O-C bonds and enhancing the stability of the amorphous SiOC matrix in the pyrolysis process.…”

Section: Polymer-to-ceramic Transformation and Phase Evolutionmentioning

confidence: 91%

“…When hafnium alkoxides were introduced into the PSN microspheres, the absorption band at 960 cm −1 in the infrared spectrum of the Hf-PSN microspheres occurs and can be assigned to Si-O-Hf groups. 34,35 Previous studies 34,35 found that metal alkoxide-modified 34,35 signifying the formation of the separated HfO 2 crystallite from the amorphous ceramic matrix. This may be caused by the Si-O-M bonds being dissociated, and then the MO x compound formed and uniformly distributed in the SiOC network during the PDC process.…”

Section: Polymer-to-ceramic Transformation and Phase Evolutionmentioning

confidence: 99%

“…It has been widely reported that the multicomponent SiMOC ceramics synthesized via the polymer precursors route can uniformly precipitate nanocrystalline MO x from the amorphous SiOC matrix at elevated temperatures, and the nanocrystalline MO x can enhance the structural stability of the PDC matrix as a reinforcement. [34][35][36] Ionescu et al 37 synthesized polymer-derived SiOC/HfO 2 ceramic nanocomposites using polysilsesquioxane and hafnium tetra (n-butoxide) and investigated the structural changes and phase evolution at different pyrolysis temperatures. The results indicated that the phase separation occurred in the SiOC matrix, and hafnium nanoprecipitate crystallized at temperatures ranging from 1100 to 1300 • C. Sujith et al 38 studied the crystallization and microstructural evolution of HfO 2 from an amorphous matrix of the SiOC system by adding hafnium alkoxide.…”

Section: Introductionmentioning

confidence: 99%

“…They discovered that prolonged heat treatment caused significant coarsening of hafnia crystallites, resulting in the phase transformation from tetragonal to monoclinic hafnia, and the HfO 2 /Si-C-N-O was thermally stable up to 1200 • C after heat treatment under argon. Sun et al 35 prepared SiOC/HfO 2 ceramic nanocomposite bulks by spark plasma sintering. The asprepared SiOC/HfO 2 bulk consisted of SiOC glass network and HfO 2 nanoparticles, which can withstand oxidation up to 1200 • C. At elevated temperatures, the SiOC network decomposed into SiO 2 and SiC phases.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and phase evolution of polymer‐derived SiHfOC ceramic microspheres

et al. 2022

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The SiHfOC ceramic microspheres were synthesized from the polysilazane and hafnium(IV) acetylacetonate hybrid precursors through a combination of hydrothermal method and polymer-derived ceramics (PDCs) method. The SiHfOC ceramic microspheres consist of β-SiC, SiO 2 , and m-HfO 2 in an amorphous SiOC matrix and are in a spherical morphology with an average size of about 2 μm. Hafnium-containing nanoparticles with ∼50-nm size are not only uniformly distributed on the surface of the ceramic microspheres but also embedded in the SiHfOC ceramic microspheres, forming a unique mosaic structure. Pyrolyzing at 1000 • C offers a possibility of an in situ formation of nanocrystal nuclei in the amorphous SiOC ceramic matrix, and the subsequent annealing at 1500 • C helps the small nanocrystal nuclei grow and separate the amorphous SiHfOC into a multiphase SiOC network containing β-SiC, SiO 2 , m-HfO 2 nanocrystalline and free C. This research provides a methodology for preparing multicomponent ceramic microspheres that can efficiently develop high-performance PDCs modified by transition metal alkoxide.

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Section: Polymer-to-ceramic Transformation and Phase Evolutionmentioning

confidence: 91%

Section: Polymer-to-ceramic Transformation and Phase Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure and phase evolution of polymer‐derived SiHfOC ceramic microspheres

et al. 2022

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“…The crystallite size for CoO calculated from (400) plane in Hf-Co-800 was ∼12.5 nm. A slight shift in peak positions for HfO 2 in both the nanocomposites, possibly due to stress in the lattice sites at the interface [31][32] is also indicative of successful synthesis of the Hf-Co-800 nanocomposite.…”

Section: Xrd Analysismentioning

confidence: 93%

HfO₂‐CoO nanoparticles for electrochemical dopamine sensing

Butt

Baig

Khan

et al. 2021

Electrochemical Science Adv

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Dopamine (DA) is a neurotransmitter that plays a pivotal role in the brain's proper functioning and several other physiological processes. Herein, we demonstrate the miniaturized electrochemical sensor for detecting DA using hafnium metal-organic framework (Hf-MOF) derived new nanocomposite of hafnium and cobalt oxides (HfO 2 -CoO). Calcination of Hf-MOF coated with cobalt acetylacetonate complex [(Co(acac) 2 ] yield HfO 2 -CoO nanoparticles supported over in situ generated graphitic carbon. The excellent adsorption capabilities of HfO 2 and highly catalytic CoO activity make this bimetallic HfO 2 -CoO nanocomposite to display a stable response over a wide linear concentration range when used as electrode material in the electrochemical DA sensing process. Moreover, the computational study also proves that CoO improves the chemisorption properties of HfO 2 for DA. Electrochemical studies are performed through cyclic voltammetry (CV), linear sweep voltammetry (LSV), and differential pulse voltammetry (DPV). For the case of LSV, the HfO 2 -CoO nanocomposite modified glassy carbon electrode (HfO 2 -CoO/GCE) exhibit a linear response to DA concentration ranging from 0.25 to 3.15 mM. However, with DPV HfO 2 -CoO/GCE electrode has displayed a linear range of 10-190 μM and a detection limit of 1.8 μM is achieved. The electrode has also shown excellent stability, and only 19 % loss in its initial current response is observed over 150 days of specific interval testing.The HfO 2 -CoO/GCE nanocomposite electrode, due to its unique feature of stability, selectivity, and sensitivity, has a good potential for use as an analytical tool for non-enzymatic sensing of DA and other neurotransmitters in the human fluid.

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Additive Manufacturing of High‐Temperature Preceramic‐Derived SiOC Hybrid Functional Ceramics

Li,

Khuje,

Islam

et al. 2023

Adv Eng Mater

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High temperature capable materials, metals, and ceramics are attracting significant interest for applications in extreme environmental conditions. Here, we report a hybrid metal reinforced ceramic matrix material consisting of preceramic derived high temperature SiOC and copper nanoplates, enabling the manufacturing of high temperature sensing electronics. The preceramic polymer precursors including polydimethylsiloxane and polydimethylsilane, together with copper nanoplates, are thermally converted into durable copper reinforced SiOC ceramics. The presence of copper in SiOC ceramics enhances its electrical conductivity, while SiOC suppresses oxygen uptake and acts as a shield for oxidation to achieve high temperature thermal resistance and negative temperature coefficient at high temperatures. A comprehensive electric and sensing performance, combined with cost‐effectiveness and scalability, could facilitate the utilization of hybrid Cu and SiOC composites in high‐temperature electronics.This article is protected by copyright. All rights reserved.

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High-temperature stability and oxidation behavior of SiOC/HfO2 ceramic nanocomposite in air

Cited by 20 publications

References 30 publications

Microstructure and phase evolution of polymer‐derived SiHfOC ceramic microspheres

Microstructure and phase evolution of polymer‐derived SiHfOC ceramic microspheres

HfO₂‐CoO nanoparticles for electrochemical dopamine sensing

Additive Manufacturing of High‐Temperature Preceramic‐Derived SiOC Hybrid Functional Ceramics

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High-temperature stability and oxidation behavior of SiOC/HfO2 ceramic nanocomposite in air

Cited by 20 publications

References 30 publications

Microstructure and phase evolution of polymer‐derived SiHfOC ceramic microspheres

Microstructure and phase evolution of polymer‐derived SiHfOC ceramic microspheres

HfO2‐CoO nanoparticles for electrochemical dopamine sensing

Additive Manufacturing of High‐Temperature Preceramic‐Derived SiOC Hybrid Functional Ceramics

Contact Info

Product

Resources

About

HfO₂‐CoO nanoparticles for electrochemical dopamine sensing