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论文类型：期刊论文

发表时间：2019-12-01

发表刊物：CARBON

收录刊物：EI、SCIE

卷号：155

页面范围：421-431

ISSN号：0008-6223

关键字：Strain sensor; Carbon nanotube network; Percolation theory; Tunneling effect; Tuning density

摘要：Transparent, highly stretchable and sensitive strain sensors have been successfully fabricated using carbon nanotube (CNT) networks with various densities as the sensing medium. Owing to the unique two-dimensional percolated structure, the CNT network-based sensors exhibit excellent sensing performance over a wide strain range from 0.5 to 100%. By decreasing the density of CNTs from 152 to 7.2/mu m(2), their gauge factor is remarkably increased from 0.4 to 50. It is found from the experimental results and theoretical analysis that the sensing mechanism of the CNT networks is transferred from percolation theory to tunneling effect with decreasing the density or increasing the tensile strain of the CNT networks. This study provides a facile technique to prepare high stretchable strain sensors and also fundamental principles for the structural design of the CNT network-based strain sensors. (C) 2019 Elsevier Ltd. All rights reserved.