Wireless flexible strain sensor based on Carbon Nanotube piezoresistive networks for embedded measurement of strain in concrete
type: Dataset
description: In the field of Structural Health Monitoring, there is growing interest in continuous volume measurements of material properties using embedded sensors organized in wireless sensor networks (1,2,3). In this work we propose a novel, highly reproducible piezoresistive sensor based on Carbon Nanotube (CNT) networks deposited on polymer to be used for embedded strain monitoring and crack detection in concrete. We highlight the originality of the fabrication process and describe the modalities for signal conditioning and for integration into a RFID-based wireless sensor network. We have achieved the first reported strain gauge fabricated by direct inkjet printing of CNTs on polymeric substrates, namely Ethylene tetrafluoroethylene (ETFE). The strain gauge we propose is of interest for its flexibility and sensitivity (Gauge Factor) which is higher than that of metallic sensors. For these reasons we believe that the proposed strain gauge is a promising alternative to the rigid metallic strain gauges currently on the market. The method is based on the dispersion of CNTs in a solution of 1,2-dichlorobenzene, with sodium dodecyl benzene sulphonate added as surfactant to enhance the solution’s wettability on the polymer. The solution is used as ink to print resistive layers of randomly oriented CNTs on polymer. We optimized the printing and the rinsing process for maximum control of the resistivity and uniformity of the CNT layers. The sensors show a Gauge Factor (GF) of 2.54 which is superior to commercial metallic strain gauges by 25%. Our technology is characterized by its high reproducibility, with only a 6.8% variation of GF values for different sensors fabricated on ETFE. Tests on multiple loading cycles prove the repeatability of the measurements over several loading cycles. Our results suggest that such devices could be used in real life applications. With this goal in mind, we compare several electronic circuits for signal conditioning (from Wheatstone bridge with amp…
issued: 2026-05-05T11:05:57.896921
language: en
modified: 2026-05-05T11:05:57.896927
contact point: Organization
  fn: CCSD
keyword: beton
keyword: capteur
keyword: conference-papers
keyword: infoeu-reposemanticsconferenceobject
keyword: physmecamemaphysics-physicsmechanics-physicsmechanics-of-materials-physicsclass-ph
keyword: physmecamsmecaphysics-physicsmechanics-physicsmaterials-and-structures-in-mechanics-physi
keyword: physmecastruphysics-physicsmechanics-physicsstructural-mechanics-physicsclass-ph
keyword: spimecamemaengineering-sciences-physicsmechanics-physicsmed-phmechanics-of-materials-phy
keyword: spimecamsmecaengineering-sciences-physicsmechanics-physicsmed-phmaterials-and-structures
keyword: spimecastruengineering-sciences-physicsmechanics-physicsmed-phstructural-mechanics-physi
keyword: tension
landing page: EWSHM - 7th European Workshop on Structural Health Monitoring

Wireless flexible strain sensor based on Carbon Nanotube piezoresistive networks for embedded measurement of strain in concrete
type: Distribution
format: HTML
issued: 2026-05-05T11:05:57.899340
modified: 2026-05-05T11:05:57.872613
access URL: https://hal.science/hal-00991859

test_moissonnage_selune
type: Agent