Electrical and mechanical properties of flexible multiwalled carbon nanotube/poly (dimethylsiloxane) based nanocomposite sheets

• Main Authors: Viannie, Leema Rose, Banapurmath, N.R., Soudagar, Manzoore Elahi M., Nandi, Anilkumar V., Hossain, Nazia, Shellikeri, Ashwini, Kaulgud, Vinita, Mujtaba, MA, Khan, Sher Afghan, Asif, Mohammad
• Format: Article
• Language: English
• Published: Elsevier 2021
• Subjects: TP1080 Polymers, plastics and their manufacture
• Online Access: http://irep.iium.edu.my/93157/7/93157_Electrical%20and%20mechanical%20properties%20of%20flexible%20multiwalled%20carbon.pdf; http://irep.iium.edu.my/93157/; https://www.sciencedirect.com/science/article/pii/S221334372101527X?dgcid=coauthor; https://doi.org/10.1016/j.jece.2021.106550

In this study, the development of highly flexible polymer nanocomposite sheets using multi-walled carbon nanotube (MWCNT) in a poly (dimethylsiloxane) (PDMS) matrix has been presented. Solution processing technique was employed, and MWCNTs were dispersed in n-hexane, and PDMS is resulting in a homogenous dispersion (between 2 wt% and 10 wt%). Scanning electron micrograph (SEM) images show the distribution of MWCNTs within the PDMS matrix, which form continuous conductive networks resulting in percolation threshold even at 2 wt% filler concentrations. The electrical conductivity of the fabricated nanocomposite sheets was found to be about 1.3–158.2 S/m. Samples with 2 wt% and 4 wt% filler concentrations exhibit excellent temporal stability both in ambient and vacuum conditions, with a near-zero temperature coefficient of resistance. The nanocomposite sheets used for mechanical studies were made as per ASTM D-412-C standards. An optimal filler concentration of 5.58 wt% can be observed with the stiffness of 0.486 MPa, the tensile strength of 0.422 MPa, the electrical conductivity of about 39.5 S/m, and elongation up to 120%. Therefore, this filler concentration is most suited for fabricating flexible strain sensors with good conductivity and temporal stability.