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Effect of thermal initiator concentration on piezoresistivity of polymer-derived amorphous silicon carbonitrides

Wang Wen-Quan Yuan Zhou Xu Shi-Feng Wang Yan-Song Zhang Li-Gong

Effect of thermal initiator concentration on piezoresistivity of polymer-derived amorphous silicon carbonitrides

Wang Wen-Quan, Yuan Zhou, Xu Shi-Feng, Wang Yan-Song, Zhang Li-Gong
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  • Abstract views:  3416
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  • Received Date:  04 May 2008
  • Accepted Date:  14 May 2008
  • Published Online:  20 October 2008

Effect of thermal initiator concentration on piezoresistivity of polymer-derived amorphous silicon carbonitrides

  • 1. (1)吉林大学物理学院,长春 130023; (2)吉林大学物理学院,长春 130023;中国科学院物理研究所磁学国家重点实验室,北京 100190; (3)中国科学院长春光学精密机械与物理研究所激发态物理重点实验室,长春 130033;中国科学院研究生院,北京 100049; (4)中国科学院研究生院,北京 100049

Abstract: Piezoresistivity of polymer-derived silicon carbonitrides made from a polysilazane modified with different amounts of thermal initiator is measured at room temperature. It is found that the thermal initiator has a significant effect on the electric conductivity, which first increases and then decreases with increasing thermal initiator concentration. The highly conductive sample exhibits much higher piezoresistive coefficient as compared with the low conductive samples. The microstructures of the materials are characterized using Raman spectroscopy. Based on these results, the piezoresistive behavior is described using the tunneling-percolation mechanisms, the piezoresistive effect of SiCN ceramics is controlled by the concentration and distribution of free carbon clusters, and the effect of thermal initiator on the formation of free carbon clusters in the materials is discussed.

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