Durability sensor using low concentration carbon nano additives

Liu, Chang, Lafdi, Khalid and Chinesta, Francisco (2020) Durability sensor using low concentration carbon nano additives. Composites Science and Technology, 195. p. 108200. ISSN 0266-3538

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Abstract

In this paper, nanocomposite durability sensors were developed in order to detect the diffusion of chemicals in real-time. Polymer nanocomposite based sensors usually consist of conductive nano-additives such as CNT (carbon nanotube), graphene, carbon black, silver nanoparticles, etc. However, these nanocomposite sensors use a high content of nanomaterials to ensure good conductivity. In this study, a special approach for a chemical sensor with a low concentration (0.1 wt%-2 wt%) carbon nano-additive was carried out and tested in the 1[M] H3PO4 solution. Responding time and electrical resistance of each stage were analyzed against the nano-additives’ concentration. The sensing behavior is represented by the decrease of electrical resistance from 100 MΩ level to 100 Ω level. A numerical multi-stage model was developed to evaluate the formation of the conductive network and its sensing property. The modeling work shows two major parameters affect the sensing behavior: (1) The aspect ratio of conductive nano-additive. (2) Diffusion coefficient ratio of different ions in different phases.

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