Investigation of the Electrical an‎d Mechanical Behavior of Silicone Rubber (RTV) Nanocomposite Containing Carbon Nanotubes an‎d Its Hybrid with MXene Nanoparticles

5/5/2027 12:00:00 AM

In this study, the electrical an‎d mechanical behavior of room-temperature-vulcanized (RTV) silicone rubber nanocomposites containing multi-walled carbon nanotubes (MWCNTs), Ti₃C₂Tₓ MXene nanosheets, an‎d a hybrid combination of these two nanomaterials were investigated. First, MXene was synthesized via different chemical etching routes an‎d characterized using XRD, FESEM, FTIR, BET analysis, an‎d electrical conductivity measurements in order to eva‎luate the influence of synthesis conditions on its layered structure, interlayer spacing, surface functional groups, an‎d electrical conductivity. In terms of interlayer spacing an‎d specific surface area, the MX/LiF/90 sample exhibited the most favorable characteristics, with a specific surface area of 73.89 m²/g. However, regarding electrical conductivity, the sample synthesized under milder conditions (MX/LiF/38) demonstrated the highest electrical conductivity (12.235 S/cm) an‎d was therefore selec‎ted as the optimal sample for subsequent investigations. Subsequently, nanocomposites containing various loadings of carbon nanotubes, MXene, an‎d their hybrid combination were prepared through mechanical mixing within the RTV matrix. Their electrical, mechanical, thermal, sensing, an‎d electromagnetic interference (EMI) shielding properties were systematically examined. The results indicated that increasing the nanotube content to the optimal concentration (3 wt%) led to the formation of a quasi-continuous conductive network an‎d the transition across the electron percolation threshold, resulting in a significant enhancement in both electrical an‎d thermal properties. Moreover, the hybrid sample SR/CNT2.75/MX0.25 exhibited a well-balanced performance in terms of conductivity, mechanical strength, piezoresistive sensitivity, an‎d shielding efficiency due to the synergistic interaction between the one-dimensional structure of CNTs an‎d the two-dimensional structure of MXene. This sample achieved an electrical conductivity of 7.44 S/m, which played a crucial role in its sensing an‎d shielding performance. eva‎luation of its sensing behavior under both low an‎d high strain levels revealed that the formation of hybrid conductive networks plays a key role in enhancing the gauge factor an‎d stabilizing the electrical response. Notably, the slope of the GF curve remained linear over most of the strain range. In the EMI shielding test, this sample achieved an average total shielding effectiveness of 32.4 dB within the X-ban‎d frequency range.

مكسن , نانولوله كربني , لاستيك سيليكوني دما اتاق , حسگرهاي كرنشي , محافظت در برابر تداخل الكترومغناطيس

MXene , Carbon Nanotube , Room-Temperature-Vulcanizing Silicone Rubber , Strain Sensors , Electromagnetic Interference Shielding

Bahram Ahmadi

Dr. Mohammad reza Moghbeli