Poly(vinyl-pyrrolidone) assisted hydrothermal synthesis of flower-like CdS nanorings

Abstract

Well-defined CdS nanorings with flower-like morphology were synthesized by a hydrothermal method using poly(vinyl-pyrrolidone) as capping agent. The phase composition, morphology, structure, and optical properties of CdS nanorings were characterized by X-ray diffraction (XRD), scanning electron microscope, transmission electron microscopy, and UV-vis absorption spectroscopic techniques. The XRD pattern of the sample can be indexed to the cubic zinc blende phase CdS. According to the quantitative analysis of energy-dispersive spectrum, the Cd:S molar ratio of the sample is about 1:0.96. The possible formation mechanism of the CdS nanorings is proposed which is based on time-resolved experiments. Furthermore, the absorption peak of CdS nanorings is red-shifted to 523 nm in the UV-vis absorption spectrum.

Annealing effect on cds nanowalls grown by chemical bath deposition on glass substrate

“…CdS semiconductor thin films are obtained by various methods such as chemical deposition [10][11][12][13][14][15], electrodeposition [16], thermal evaporation [17], RF Magnetron sputtering [18], chemical spray pyrolysis [19]. Different CdS semiconductor morphologies have been prepared using various methods, including nanorods [20], flower-like nanorings [21], conifer-like [22], cauliflower-like microspheres [23], nanowires [24], flakes [25], and flowers [26]. Chemical vapor deposition, plasma assisted approach, microwave-based method, solution growth method and hydrothermal pathway methods come to the fore when focusing primarily on which techniques are used in the literature to create nanowalls.…”