Optimized Synthesis and Fluorescence Spectrum Analysis of CdSe Quantum Dots

Abstract

An optimized synthesis route was applied for controlling the preparation of CdSe quantum dots (QDs) in an aqueous solution. Some key factors which influencing the properties of CdSe QDs, such as initial pH, stabilizers, ratio of precursor, etc. were investigated. The size, shape, crystal structure, and optical property of CdSe QDs were also characterized by TEM, XRD, UV-Vis, and fluorescence (FL) spectra. The result showed that high-quality cubic CdSe QDs with 3 nm were obtained. The experiments also confirmed that thioglycolic acid (TGA), under the conditions of weak acid, is a better stabilizer than others. The ratio of [Cd²⁺] to [SeSO₃ ²⁻] played an important role in the formation of CdSe QDs. The mechanisms about the influence factors were also presented.

Keywords:

• CdSe QDs
• influence factors
• optimized synthesis

This work was financially supported by the National Natural Science Foundation of China (10405034), and the fund of knowledge innovation projects of Chinese Academy of Sciences (KJCXI-SW-08).