2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Poly(vinyl amine) Stabilized Colloidal CdS Quantum Dots of Color-Tunable Photoluminescence: Syntheses and Optical Properties

K.-M. Chen and S.-S. Hou
National Cheng Kung University, TW

quantum dots, CdS, poly(vinyl amine)

The colloidal CdS QD solutions were prepared with PVAm as the stabilizing polymer in a mixed solvent composed of methanol and water. The emitting colors of the prepared CdS QD colloids are tunable by varying the ratio of methanol/water and pH of the solvents. The CdS QD colloids are colorless under UV light at extremely low pH and the low ratio of methanol to water. The emitting color of the CdS QD colloids turn to yellow and orange as increasing methanol content and pH of the solvent. At high pH or when the cosolvent is dominant in methanol the CdS QD colloids show bright to deep blue emission. The optical properties of the CdS colloids have been systematically studied in terms of UV-vis and fluorescence spectrometry. In addition, we found that the state of polymer aggregations in different solutions significantly affects the sizes of prepared CdS QDs. Other factors such as the ratio of Cd2+/S2-and the polymer concentration on the optical properties of forming CdS QDs were also studied.

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