Electrical conductivity change induced by porosity within polymer-derived SiCN ceramics

Niu, Jiahong; Meng, Sheng; Jin, Hua; Yi, Fajun; Li, Jinping; Zhang, Gaoming; Zhou, Yexin

doi:10.1016/j.jallcom.2018.10.284

Cited by 23 publications

(18 citation statements)

References 40 publications

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“…In addition to phase composition and microstructure, pores and temperature also have a great influence on the electrical conductivity of PDCs. Through theoretical model predictions and experimental studies, Meng et al [26] found that porosity significantly affects the composition and the nanostructure evolution of polymer-derived SiCN ceramics, which in turn significantly affects In addition to phase composition and microstructure, pores and temperature also have a great influence on the electrical conductivity of PDCs. Through theoretical model predictions and experimental studies, Meng et al [26] found that porosity significantly affects the composition and the nanostructure evolution of polymer-derived SiCN ceramics, which in turn significantly affects electrical conductivity.…”

Section: Electrial Propertiesmentioning

confidence: 99%

“…Therefore, the shapes of polymers could be tailored according to specific requirements after pyrolysis. At present, the most widely studied PDCs systems are mainly PDCs-SiC [5][6][7][8][9][10][11][12], PDCs-SiOC [13][14][15][16][17][18][19][20][21][22], and PDCs-SiCN [23][24][25][26][27][28][29][30][31][32] systems.…”

Section: Introductionmentioning

confidence: 99%

“…Wilhelm's group [18] fabricated PDCs-SiOC with high specific surface area (~400 m 2 •g −1 ) by freeze casting and loading with Ni nanoparticles, and it displayed good catalytic activity; in the CO 2 methanation reaction, the maximum conversion rate was 0.49, and the maximum methane selectivity was 0.74. In addition, by functionalizing polymer-derived Si-based ceramics, it can also significantly improve its mechanical [5,15,43,47,61], thermal [41,43,[62][63][64], and electrical properties [6,14,26,40,43], which could be widely used in the preparation of conductive ceramics, sensors, membranes, coatings, and components for usage under harsh environments.…”

Section: Introductionmentioning

confidence: 99%

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Polymer-Derived Si-Based Ceramics: Recent Developments and Perspectives

et al. 2020

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Polymer derived ceramics (PDCs) are promising candidates for usages as the functionalization of inorganic Si-based materials. Compared with traditional ceramics preparation methods, it is easier to prepare and functionalize ceramics with complex shapes by using the PDCs technique, thereby broadening the application fields of inorganic Si-based ceramics. In this article, we summarized the research progress and the trends of PDCs in recent years, especially most recent three years. Fabrication techniques (traditional preparation, 3D printing, template method, freezing casting techniques, etc.), microstructural tailoring mainly via additive doping, and properties (mechanical, thermal, electrical, as well as dielectric and electromagnetic wave absorption properties) of Si-based PDCs were explicated. Meanwhile, challenges and perspectives for PDCs techniques were proposed as well, with the purpose to enlighten multiple functionalized applications of polymer-derived Si-based ceramics.

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Section: Electrial Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polymer-Derived Si-Based Ceramics: Recent Developments and Perspectives

et al. 2020

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“…conductivity, polymer-derived ceramics, precursor infiltration and pyrolysis, temperature sensitivity, wireless passive pressure sensor the conductivity of PDCs. 12,13 In general, the conductivity, which is determined by the microstructure of PDCs, can be tuned by pyrolysis temperature and precursor chemical properties. 14,15 However, the microstructure of PDCs is also sensitive to the processing route, which can significantly affect the conductivity of PDCs.…”

Section: Introductionmentioning

confidence: 99%

Effect of the graphitization level of the free carbon on the temperature sensitivity of silicon carbonitride‐based pressure sensors

Huang

et al. 2021

J Am Ceram Soc

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The transformation route of polymer to ceramic is also known as polymer-derived ceramics (PDCs), which exhibit excellent thermal stability, 1 oxidation/corrosion resistance, 2,3 creep resistance, 4 and these properties make them one of the best candidate materials for pressure sensors used in the harsh environment, especially in aero-engines. Moreover, PDCs also have excellent electrical properties, such as giant piezoresistivity, 5 low dielectric loss and dielectric constant, 6 and tunable conductivity. 7,8 These unique electrical properties of PDCs are strongly related to two regions in their microstructure: one is the amorphous phase(s) of Si containing, and the other is the amorphous free-carbon area containing defective carbon clusters. [9][10][11] When the pyrolysis temperature is less than 1400°C, the amorphous free-carbon phase of PDCs will experience graphitization process and form nanosized carbon clusters. Because the PDC conduction mechanisms are determined by the morphology and content of the free-carbon phase, the graphitization level of free carbon has an important effect on

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“…PDCs are mainly composed of a network by free carbon and Si-rich nanodomains inside [ 9 ], while grains of PDCs are usually nanosized. This unique microstructure renders excellent physical and chemical properties in PDCs [ 10 , 11 ], such as thermal [ 12 , 13 , 14 , 15 ], electrical [ 16 , 17 , 18 ], electrochemical energy storage [ 19 , 20 ], and electromagnetic properties [ 21 , 22 , 23 , 24 , 25 ]. Nevertheless, during the pyrolysis of the ceramic precursors, a large amount of small molecule gas would be released, and the green body would shrink, with the formation of pores and cracks.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of (SiC-AlN)/ZrB2 Composite with Nano-Micron Hybrid Microstructure via PCS-Derived Ceramics Route

et al. 2021

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In this work, a (SiC-AlN)/ZrB2 composite with outstanding mechanical properties was prepared by using polymer-derived ceramics (PDCs) and hot-pressing technique. Flexural strength reached up to 460 ± 41 MPa, while AlN and ZrB2 contents were 10 wt%, and 15 wt%, respectively, under a hot-pressing temperature of 2000 °C. XRD pattern-evidenced SiC generated by pyrolysis of polycarbosilane (PCS) was mainly composed by 2H-SiC and 4H-SiC, both belonging to α-SiC. Micron-level ZrB2 secondary phase was observed inside the (SiC-AlN)/ZrB2 composite, while the mean grain size (MGS) of SiC-AlN matrix was approximately 97 nm. This unique nano-micron hybrid microstructure enhanced the mechanical properties. The present investigation provided a feasible tactic for strengthening ceramics from PDCs raw materials.

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Electrical conductivity change induced by porosity within polymer-derived SiCN ceramics

Cited by 23 publications

References 40 publications

Polymer-Derived Si-Based Ceramics: Recent Developments and Perspectives

Polymer-Derived Si-Based Ceramics: Recent Developments and Perspectives

Effect of the graphitization level of the free carbon on the temperature sensitivity of silicon carbonitride‐based pressure sensors

Fabrication of (SiC-AlN)/ZrB2 Composite with Nano-Micron Hybrid Microstructure via PCS-Derived Ceramics Route

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