12/8/2023 0 Comments Kapton polyimide![]() Previous works have reported that the carbon bonds which constitute Kapton ®’s structure can be partially isolated using charged-particle excitation, ultraviolet (UV) laser radiation, pyrolysis processes or heat-treatments. Since its commercialization, Kapton ® films have been used in an impressive wide range of applications, highlighting their use as substrate for flexible electronics. In this work, we revisited one of those top-down production approaches by proposing the carbon-rich aromatic polyimides, such as Kapton ® films, as raw-material to obtain inexpensive graphene-derived sheets which, regardless of their lower crystallographic quality, are capturing growing niches of interest. However, up to date, they suffer from relatively low yield and high production costs as compared with certain top-down approaches. Some of those techniques, such as the epitaxial growth on Silicon Carbide or the Chemical Vapor Deposition (CVD), follow a bottom-up approach pursuing the synthesis of high-quality graphene from a physico-chemical assembly of elemental carbon sources. The difficulties associated with the current production methods have raised researchers’ interest in a wide spectrum of techniques to synthesize graphene-based materials. Nevertheless, reproducible cost-effective methods for the mass production of samples, which would allow for introducing them into the market, are still being sought. Additionally, we show that the contact resistance can be decreased down to promising values of ∼2 Ω when using silver-based electrodes.Ĭarbon nanostructures and graphene-derived sheets are auspicious materials for different areas in science and technology, such as healthcare, flexible electronics or energy storage. Once the laser-ablation process is optimized, the samples increase their conductivity up to six orders of magnitude, being comparable to that of graphene obtained by chemical vapor deposition or by the reduction of graphene-oxide. The laser-modified surface was also electrically characterized through the Transmission Line Method (TLM) aiming at the improvement of the conductivity of the samples by tuning the laser power and the extraction of the contact resistance of the electrodes. The results show that the laser-assisted ablation constitutes a simple one-step and environmental friendly method to induce graphene-derived structures on the surface of polyimide films. ![]() Laser-treated samples were structurally characterized using Scanning Electron Microscopy (SEM), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), as well as Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy. This work presents a detailed study of the photothermal ablation of Kapton ® polyimide by a laser diode targeting its electrical conductivity enhancement.
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