材料科学
拉曼光谱
纳米复合材料
微晶
碳纤维
热解
硅
分析化学(期刊)
扫描电子显微镜
石墨烯
光谱学
化学工程
复合材料
纳米技术
复合数
化学
光电子学
有机化学
冶金
光学
物理
工程类
量子力学
作者
Oluwole Daniel Adigun,Emmanuel Ricohermoso,A. A. Daniyan,L.E. Umoru,Emanuel Ionescu
出处
期刊:Ceramics
[Multidisciplinary Digital Publishing Institute]
日期:2022-10-03
卷期号:5 (4): 690-705
被引量:6
标识
DOI:10.3390/ceramics5040050
摘要
This article reports on the structure and electronic properties of carbon-rich polysilazane polymer-derived silicon carbonitride (C/SiCN) corresponding to pyrolysis temperatures between 1100 and 1600 °C in an argon atmosphere. Raman spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), Scanning Electron Microscopy (SEM) and Hall measurements were used to support the structural and electronic properties characterization of the prepared C/SiCN nanocomposites. A structural analysis using Raman spectroscopy showed the evolution of sp2 hybridized carbon phase that resulted from the growth in the lateral crystallite size (La), average continuous graphene length including tortuosity (Leq) and inter-defects distance (LD) with an increase in pyrolysis temperature. The prepared C/SiCN monoliths showed a record high room temperature (RT) electrical conductivity of 9.6 S/cm for the sample prepared at 1600 °C. The electronic properties of the nanocomposites determined using Hall measurement revealed an anomalous change in the predominant charge carriers from n-type in the samples pyrolyzed at 1100 °C to predominantly p-type in the samples prepared at 1400 and 1600 °C. According to this outcome, tailor-made carbon-rich SiCN polymer-derived ceramics could be developed to produce n-type and p-type semiconductors for development of the next generation of electronic systems for applications in extreme temperature environments.
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