摘要
Constructs a MoS 2 /Ti 3 C 2 T x composite humidity-sensitive material. • Fabricates flexible LC sensors using inkjet printing on PET. • Enables wireless passive, non-contact humidity monitoring without built-in power. This study reports an inkjet-printed wireless passive LC humidity sensor incorporating a MoS 2 /Ti 3 C 2 T x composite as the humidity-sensitive layer. Flower-like MoS₂, multilayer Ti 3 C 2 T x MXene, and MoS 2 /Ti 3 C 2 T x composites were prepared via hydrothermal synthesis, selective etching, and in situ growth, respectively, and integrated with an inkjet-printed LC resonant circuit on a polyethylene terephthalate (PET) substrate. Structural and chemical characterization using SEM, EDS, FTIR, XRD, and XPS confirmed that MoS₂ nanoflowers were uniformly distributed on the accordion-like multilayer Ti 3 C 2 T x framework, forming a nanocomposite with abundant hydrophilic functional groups and strong interfacial interactions. These features provided numerous adsorption sites for water molecules, facilitated molecular diffusion, and enhanced humidity-dependent dielectric modulation. Following optimization with a 5 mg/mL MoS 2 /Ti 3 C 2 T x dispersion, the sensor exhibited a resonance frequency shift of 85 MHz over a relative humidity (RH) range of 20%–90%, achieving a sensitivity of 1.2943 MHz/%RH. The device also demonstrated low hysteresis of approximately 5%, rapid response and recovery times of 16 and 40 s, respectively, good device-to-device reproducibility, and stable output during both a 50 h short-term test and a 10-day long-term test. The enhanced sensing performance is attributed to the synergistic effects of the high-surface-area MoS 2 nanoflowers, conductive layered Ti 3 C 2 T x channels, and hydrophilic surface terminations. This work presents a promising materials and device strategy for highly sensitive, low-cost, non-contact humidity monitoring. Download: Download high-res image (160KB) Download: Download full-size image
危险品化学品经营许可证（带存储）