Bifunctional Carbon-Dot-WS₂ Nanorods for Photothermal Therapy and Cell Imaging

Multifunctional nanoparticles have attracted significant interest as biomedical vehicles, combining diagnostic, imaging, and therapeutic properties. We describe herein the construction of new nanoparticle conjugates comprising WS₂ nanorods (NRs) coupled to fluorescent carbon dots (C-dots). We show that the WS₂ -C-dot hybrids integrate the unique physical properties of the two species, specifically the photothermal activity of the WS₂ NRs upon irradiation with near-infrared (NIR) light and the excitation-dependent luminescence emission of the C-dots. The WS₂ -C-dot NRs have been shown to be non-cytotoxic and have been successfully employed for multicolour cell imaging and targeted cell killing under NIR irradiation, pointing to their potential utilization as effective therapeutic vehicles.