Flexible and transparent strain sensors with high sensitivity were fabricated by embedding hybrid networks of carbon nanotubes (CNTs) and carbon (C) nanoparticles into micro-mesh polydimethylsiloxane (PDMS) substrates. The resulting devices exhibited optical transmittance above 70% and haze below 7%, ensuring unobtrusive integration on skin. Systematic variation of CNT:C ratios (0:1, 1:1, 2:1, 3:1) revealed that the 2:1 hybrid achieved optimal performance, combining uniform dispersion, strong interfacial adhesion, and robust conductive pathways. The optimized device (S2-PDMS) demonstrated a maximum gauge factor of 465.35 at 32.5% strain, and reliable cycling stability for repeatability of stretching, bending, and twisting deformations. Mechanical tests confirmed high tensile strength (2.63 MPa) and durability under repeated deformation, outperforming polyethylene terephthalate (PET)-based counterparts. The sensor also exhibited response times in the range of ~158–57 ms and recovery times between ~110 ms and 697 ms, depending on the type and complexity of the human motion. As such, the sensors successfully monitored diverse human motions, subtle muscle activity, and vocal vibrations, and enabled wireless data transmission via Bluetooth, underscoring their potential for real-time health monitoring, human–machine interfaces, and Internet of Things-enabled wearable electronics.

Semiconductor–metal nanocomposites have been widely investigated to modify the intrinsic properties of materials used for optoelectronic devices and sensing applications. In this study, a method for rapid synthesis of MoS₂–Ag nanocomposites via laser-assisted photoreduction was proposed. For the photoreduction process, we used AgNO₃ solution as a metal source. Under laser irradiation, Ag ions were easily reduced on MoS₂ by photo-generated electrons from MoS₂. The optical properties of MoS₂–Ag nanocomposites were easily controlled by simple adjustment of the photoreduction time. To investigate the surface-enhanced Raman scattering (SERS) effect of the MoS₂–Ag nanocomposites, the SERS spectra of methylene blue (MB) on MoS₂–Ag nanocomposites were measured, and the nanocomposites were found to enhance the Raman scattering intensity of MB up to ~10⁶. Therefore, the laser-assisted photoreduction method has great potential for rapid synthesis and optical tuning of semiconductor–metal nanocomposites.