Synthesis of CdS@ZnO nanocomposites with wide visible light absorption range

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Synthesis of CdS@ZnO nanocomposites with wide visible light absorption range Mengyang Lu1, Xinmeng Wang1, Chao Xu1, and Yongqian Wang1,2,3,* 1

Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, 388# Lumo Road, Wuhan 430074, People’s Republic of China 2 The Key Laboratory of Forensic Science in Hubei Province, Hubei University of Police, 99# South Mud Bay Avenue, Wuhan 430074, People’s Republic of China 3 Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, 1088# Xueyuan Road, Shenzhen 518055, People’s Republic of China

Received: 24 June 2020

ABSTRACT

Accepted: 21 August 2020

In this paper, urchin-like ZnO nanostructures were synthesized via a facile onestep hydrothermal method. CdS was deposited on the ZnO nanostructures by the deposition method. Field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD) were used to analyze the morphology and structure of samples. FESEM images show that urchin-like ZnO nanostructures gradually turn into flower-like CdS@ZnO nanostructures with the increase of deposition times. XRD patterns confirm that the ZnO nanostructures present hexagonal wurtzite crystalline structure and CdS@ZnO nanostructures have high crystallinity. UV-vis absorption spectra and photoluminescence spectra (PL) were used to characterize the optical properties of samples. The results show that CdS@ZnO nanocomposites have higher visible light utilization when compared with the pure urchin-like ZnO. Furthermore, the results of photocatalysis experiments show that the absorption towards visible light of ZnO is significantly enhanced because of the incorporation of CdS. This kind of material with excellent optical properties can be used in photocatalysis and optoelectronic devices.

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Springer Science+Business

Media, LLC, part of Springer Nature 2020

1 Introduction With the rapid development of industry, environment pollution has become a problem needed to be solved urgently in the past few years [1–5]. The Mengyang Lu and Xinmeng Wang are the co-first authors.

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https://doi.org/10.1007/s10854-020-04317-3

discharge of organic pollutants and harmful inorganic substances in industrial and domestic sewage has exceeded the natural degradation capacity of the ecosystem [6, 7]. What is worse, a large amount of CO2 produced by the natural degradation of these

J Mater Sci: Mater Electron

pollutants accumulated in the atmosphere has a devastating effect on the global climate, which will lead to melting of glaciers and more environmental problems [8–14]. Therefore, it is overwhelmingly desirable to convert these pollutants into organic fuel to achieve sustainable energy production which mainly rely on the high efficiency photocatalyst [15–17]. Semiconductor materials were used to solve this problem because of the excellent photocatalytic properties [18], which can utilize solar energy to degrade environment pollutants i