Preparation of dendritic‐like CdS by hydrothermal method and its photocatalytic performance

Abstract

In this article, dendritic-like CdS has been prepared by a hydrothermal method using thiourea as the sulfur source, and the effects of experimental conditions on the morphologies of CdS have been investigated. The performances of CdS have been analyzed by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and the fluorescence and photodegradation properties of CdS have also been investigated. The XRD result indicates that the dendriticlike CdS are of hexagonal phase and they are highly crystallized. Also, the FESEM results show that the ratio of raw material affects the yield of CdS, the reaction time affects the morphology of CdS. The best morphology of CdS is dendritic structures and the length is about 6 μm. The fluorescence spectrum shows three peaks at 470 nm, 513 nm and 547 nm, which indicates that the dendritic-like CdS mainly emits green and blue fluorescence. Moreover, the dendriticlike CdS exhibits good photocatalytic activity and its photodegradation rate to methylene blue can reach 92%. The growth mechanism for the formation of CdS with dendritic structure is also described.

Optimizing the precursor of sulfur source for hydrothermal synthesis of high performance CdS for photocatalytic hydrogen production

“…3a ) to result in the final branched 1D structures as the growth rate of hexagonal CdS in c -axis is usually faster than other directions. 36 As displayed in Fig. 3b and e , when TAA was used as the sulfur source, spherical CdS was obtained with a scale of 3–6 μm.…”

“…Besides, the structure, morphology and component of CdS also can be readily tuned by this route through the change of the reaction conditions, such as the composition of the solution, the treatment temperature and the reaction time. 13,31,[34][35][36] One of the key factors to affect the property of CdS is the precursor of sulfur. Generally, for the preparation of nanostructure CdS, organic sulfur sources such as thiourea (TA), thioacetamide (TAA) and L-cysteine (L-Cys) are more popular than inorganic one like Na 2 S. 35,[37][38][39][40][41][42][43] It can be ascribed to the fact that, compared to the rigid inorganic sulfur sources, organic sulfur sources have distinct advantages in exibility, structure variety and shape diversity, which can not only serve as a precursor of S 2À , but also as a complexing agent for Cd 2+ due to the presence of -NH 2 and -COOH ligand groups to control the nucleation and the growth of CdS.…”

Dangling Bond-Induced Surface Depletion in CdS Leaf

“…7 Therefore, tuning the desired properties of the CdS semiconductor by modifying the morphology is vital. Consequently, researchers have successfully synthesized CdS in the form of nanowires, 8 dumbells, 9 nanorods, 10 hollow spheres, 11 nanobelts, 12 popcorn, 13 dendrites, 14 flowers, 15 leaves, 16 etc. It has been noted from these shape-engineered anisotropic CdS nanomaterials that the surface contribution is significantly different from that of the bulk though the reason for this is not fully understood.…”

Effect of morphology transformation on photocatalytic performance of CdS crystal

“…An et al [15] have prepared pencil-like CdS nanorods and improved photocatalytic performance of CdS. Yang et al [16] have synthesized dendritic-like CdS and studied the degradation efficiency of methylene blue by CdS. In the previous work, CdS nanorods were synthesized using ethylenediamine (En) [17].…”