Abstract
We report the synthesis of colloidal CdSe quantum dots doped with a novel Ag precursor: AgCl. The addition of AgCl causes dramatic changes in the morphology of synthesized nanocrystals from spherical nanoparticles to tetrapods and finally to large ellipsoidal nanoparticles. Ellipsoidal nanoparticles possess an intensive near-IR photoluminescence ranging up to 0.9 eV (ca. 1400 nm). In this article, we explain the reasons for the formation of the ellipsoidal nanoparticles as well as the peculiarities of the process. The structure, Ag content, and optical properties of quantum dots are also investigated. The optimal conditions for maximizing both the reaction yield and IR photoluminescence quantum yield are found.
Highlights
Colloidal quantum dots (QDs) have attracted considerable attention because of their physical and chemical properties
Composition and shape of NCs obtained with the use of X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray fluorescence spectroscopy (XRF)
The structure and morphology of synthesized QDs depend on the amount of AgCl added during synthesis
Summary
Colloidal quantum dots (QDs) have attracted considerable attention because of their physical and chemical properties. The XRD pattern of undoped CdSe NPs (AgCl_0) (Figure 1a) contains three main peaks at diffraction angles of 2θ = 25.05°, Table 1: Amount of Ag and Cd precursors in synthesis.
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