Properties of cement-sand-based piezoelectric composites with carbon nanotubes modification

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• 作者：Ping Zhao^a ; ^{zhaop@d.umn.edu" class="auth_mail" title="E-mail the corresponding author} ; Shifa Wang^a ; Alec Kadlec^a ; Zhaodong Li^b ; Xudong Wang^b
• 关键词：B. Composites ; C. Dielectric properties ; piezoelectric properties ; D. PZT
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：42
• 期：13
• 页码：15030-15034
• 全文大小：889 K

文摘

Carbon nanotubes (CNTs) were dispersed in a cement–sand-based piezoelectric composite as conductive fillers to improve its poling efficiency. Specimens were prepared by mixing PZT powders, cement and sand with CNTs. The effect of CNTs ranging from 0 to 0.9 vol% on properties of the composite, including its piezoelectric coefficient, dielectric constant and loss, and sensing characteristic, were characterized. It was found that the addition of CNTs facilitated effective poling under a low electric field of 1 MV/m at room temperature and improved the piezoelectric and dielectric properties of the composite. The composite modified by CNTs achieved optimal properties when the CNTs content was 0.6 vol% and this was verified by the investigation of sensing effects of the composite through compressive tests.