Biotemplating fabrication of CdS embedded bionanowires at room temperature

Cadmium Sulfide (CdS) nanowires (NWs) were synthesized by templating bionanotubes self-assembled from bis (N-amido-glycylglycine)-1,7-heptane dicarboxylate using cadmium chloride (CdCl₂) and sodium sulfide (Na₂S) as Cdand S precursors. The-COOH groups from the bionanotube surface act as chelating agents to coordinate Cd²⁺ ions and facilitate further growth of CdS nanocrystals on the bionanotube. The morphology, structure and composition of CdS embedded bionanowires were characterized by Transmission Electron Microscopy (TEM), High Resolution Transmission Electron Microscopy (HRTEM), Selected Area Electron Diffraction (SAED), UY, steady state Photoluminescence (PL) and Energy-dispersive X-ray spectroscopy (EDS) techniques. The results show that the resulting CdS embedded bionanowires, (4±0.6)!m in length and (400±55) nm in diameter, are coated by CdS nanoparticles with diameter of (5.5±0.3) nm. This work presents an effective direct-growth strategy on biomolecular templates to synthesize monodispersed QD-coated nanowires at room temperature by using coordination between - COOH and Cd²⁺, which has not accomplished previously by any other non-biotemplating synthetic methods.