TiSquantum dots composite carbon nanotubes aerogel with electromagnetic interference shielding effect.

Titanium disulfide quantum dots (TiSQDs) has garnered significant research interest due to its distinctive electronic and optical properties. However, the effectiveness of TiSQDs in electromagnetic interference (EMI) shielding is influenced by various factors, including their size, morphology, monodispersity, tunable bandgap, Stokes shift and interfacial effects. In this study, we propose a systematic approach for the synthesis of TiSQDs with small size (3.1 nm), uniform dispersion (∼1.5 nm), a transition from indirect to direct bandgap (bulk 0.09 eV-monolayer 0.69 eV), large Stokes shift (∼93 nm) and larger surface area containing multiple active interfaces, achieved through ultrasound-assisted liquid phase processing. Subsequently, these QDs are combined with carbon nanotubes (CNTs) to fabricate an aerogel with outstanding EMI shielding capabilities. The resulting TiSQDs composite CNTs (C-TiS) aerogel demonstrates robust EMI shielding of 51.9 dB within the microwave X-band (8-12.4 GHz) due to its porous and lightweight structure, effectively mitigating incoming electromagnetic (EM) radiation. Overall, this study highlights the promising properties of C-TiSaerogel for applications in both civilian and military fields.