High quality CdS nanocrystals: surface effects

• Published in: Synthetic metals Vol. 139; no. 3; pp. 597 - 600
• Main Authors: Zezza, F., Comparelli, R., Striccoli, M., Curri, M.L., Tommasi, R., Agostiano, A., Della Monica, M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 09.10.2003; Amsterdam Elsevier Science; New York, NY
• Subjects: CdS; Colloidal nanocrystals; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Luminescence; Nanocrystals and nanoparticles; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics; Colloidal nanocrystals; CdS; Luminescence; Chemical solution; Particle size; Inorganic compounds; Semiconductor materials; Transition element compounds; Cadmium sulfides; Photoluminescence; Experimental study; Fabrication property relation; Spectral line shift; Quantum size effect; Surface effect; Absorption spectra; Nanocrystal
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/S0379-6779(03)00320-5

Stable and highly luminescent CdS nanocrystals (NCs) have been synthesized by means of decomposition of suitable precursors (CdO and elemental sulphur) in octadecene (ODE) and oleic acid at high temperature. Absorption and steady state photoluminescence (PL) measurements have been carried out to study the intrinsic properties of nanocrystals and the effect of ligand and solvent on emission properties. Ageing of nanocrystals has been investigated, and an efficient mechanism of emission recovery has been identified, showing the active role of non coordinating solvent and oleic acid in modifying the surface states.