Structural and thermal properties of PDMS/Triton/laser-induced graphene composites

Abstract

Laser-induced graphene (LIG) has recently been proposed as a viable option for fabricating various types of flexible electronic devices due to its excellent mechanical stability and electrical properties. During laser induction of graphene on polymers, the high temperature generated with the laser breaks C-O, C=O, and N-C bonds in polymers, leading to the recombination of C and N atoms. Additionally, the rapid release of carbonaceous and nitric gases results in the formation of 3D porous structures. This approach offers a one-step, chemical-free synthesis method for producing porous graphene on polymer surfaces. Moreover, it is a fast and cost-effective technique that is ideal for flexible electronics and energy storage devices. In this study, graphene was formed on a poly(dimethylsiloxane) (PDMS)/Triton substrate with varying concentrations of Triton (1-30 wt.%) using CO2 laser irradiation. The effects of Triton content on the structural, thermal, and surface characteristics of PDMS/Triton and PDMS/Triton/graphene materials were investigated. The prepared PDMS/Triton/graphene materials were thoroughly examined using X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and water contact angle analysis. XRD analysis confirmed the presence of graphene in the material. The thermal and surface properties of the proposed materials can be easily adjusted by manipulating the Triton concentration. The hydrophilicity of the prepared PDMS/Triton materials increased compared to pure PDMS, which is hydrophobic. It was found that the success of LIG formation depends on Triton content, increasing with higher concentration of Triton in the PDMS matrix. The presented results aim to address the existing challenges associated with stretchable polymers suitable for flexible electronic device applications

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