Assessment of Polyurethane Nanofiber with Nikel as Terahertz Metamaterial and Strain Sensor

Résumé fourni par la source

This study aims to develop mechanical tunable metamaterials operating at wideband terahertz frequencies (up to 30 THz) for mapping strain in opaque composite materials. This study has produced thermoplastic polyurethane (TPU) nanofiber matrix with nickel nanoparticle (TPU-Ni) using electrospun nanofiber technology. We have characterized the morphological, electrochemical, and mechanical properties of produced TPU-Ni composite. We also measured the response of the T-ray wave of TPU-Ni as a function of strain by applying a stretching force to the composite using a T-ray time-domain spectroscopy. Scanning electron microscopy image with EDS analysis confirms the embedding of Ni nanoparticles with the polymer matrix. Cyclic voltammetry tests on TPU-Ni nanofiber measured a current peak for the applied voltage. Pull-out tension tests found that the TPUNi polymer matrix is flexible and has sufficient strength to be used as a sensing material for highly sensitive strain gauge applications. THz reflected intensity as a function of a strain of TPU-Ni for five repeated reversal loading cycles shows fully recoverable strain in repeated load cycles. This study concluded that the TPU-Ni composite has the potential to be used for flexible terahertz metamaterial-based sensor applications.

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