Open AccessEffect of thermal initiator concentration on piezoresistivity of polymer-derived amorphous silicon carbonitrides
Author(s) -
Yansong Wang,
Wenquan Wang,
Yuan Zhou,
Ligong Zhang,
XU Shi-feng
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.6540
Subject(s) - materials science , piezoresistive effect , composite material , polymer , silicon , temperature coefficient , amorphous solid , percolation (cognitive psychology) , ceramic , chemistry , organic chemistry , neuroscience , metallurgy , biology
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.