Synthesis and optical properties of self-assembled flower-like CdS architectures by mixed solvothermal process

Abstract

Self-assembled CdS architectures with flower-like structures have been synthesized by a mixed solvothermal method using ethylene glycol and oleic acid as the mixed solvent at 160°C for 12 h. The results of X-ray diffraction (XRD) patterns, field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) images indicate that the product exists as the hexagonal wurtzite phase and conatins of larger numbers of flower-like CdS architectures with diameters of 1.8–3 μm. The selected-area electron diffraction (SAED) pattern and the high resolution transmission electron microscope (HRTEM) image reveal that the grain has better crystallinity. The optical properties of flower-like CdS architectures were also investigated by ultraviolet-visable (UV-vis) and photoluminescence spectroscopy at room temperature. A strong peak at 490 nm is shown in the UV-vis absorption, while an emission at 486 nm and another strong emission at 712 nm are shown in the PL spectrum.

Crystal-Orientation-Related Dynamic Tuning of the Lasing Spectra of CdS Nanobelts by Piezoelectric Polarization

“…Figure h shows the photoluminescence (PL) spectra of a nanobelt. The intense peak at 490.7 nm is attributed to the near band edge (NBE) emission of CdS, which appears blue-shifted compared to the ∼500–520 nm NBE emission of ordinary CdS ,− because of the quantum confinement effects of the ultrathin CdS nanobelt. , The broad emission at 550–700 nm, centered at 622.8 nm, is due to surface defect emission, such as structural defects, sulfur vacancies, or impurities. ,, The Raman spectrum of an individual CdS nanobelt is shown in Figure i. Typical Raman peaks centered at 212, 234, 253, 300, 347, 365, and 602 nm can be observed.…”