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Title: Facile microwave-assisted aqueous synthesis of CdS nanocrystals with their photocatalytic activities under visible lighting

Abstract

Graphical abstract: - Highlights: • Three kinds of CdS nanostructures have been controllably synthesized. • Ethanediamine acts as a phase and morphology controlling reagent. • Three CdS nanostructures display high visible light photocatalytic activities. • Cubic CdS-3 shows superior photocatalytic activity to the other hexagonal CdS. • The growth processes for fabrication of CdS nanocrystals are also discussed. - Abstract: Three kinds of CdS nanostructures, that is, hexagonal nanospheres (CdS-1), hierarchical caterpillar-fungus-like hexagonal nanorods (CdS-2) and hierarchical cubic microspheres (CdS-3), were controllably synthesized by a facile and one-pot microwave-assisted aqueous chemical method using ethanediamine as a phase and morphology controlling reagent. The as-prepared products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectra (DRS) and photoluminescence (PL) spectra. The results show that CdS-1 is mainly composed of monodispersed hexagonal nanospheres with average diameters of about 100 nm; hexagonal CdS-2 has lengths in the range of 600–800 nm and diameters of 40–60 nm, assembled by nanoparticles about 20 nm in diameter; and CdS-3 is pure cubic microspheres with diameters in the range of 0.8–1.3 μm, aggregated by tiny nanograins with size of 5.8 nm. The band gap energies of CdSmore » products were calculated to be 2.30, 2.31 and 2.24 eV observed from UV–vis DRS for CdS-1, CdS-2 and CdS-3, respectively. PL spectra of CdS samples showed that sphalerite CdS-3 possesses a very weak fluorescence, while wurtzite CdS-2 has a strongest green near-band edge emission (NBE) at 550 nm. The visible light photodegradation of methylene blue and rhodamine B in the presence of CdS photocatalysts illustrates that all of them display high photocatalytic activities. Significantly, the cubic CdS-3 exhibits more excellent photocatalytic behavior in degradation of organic dyes than the other hexagonal CdS, which is closely related to the phase and morphology structure of cubic CdS.« less

Authors:
 [1];  [1]
  1. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026 (China)
Publication Date:
OSTI Identifier:
22285166
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 48; Journal Issue: 10; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CADMIUM SULFIDES; DYES; FIELD EMISSION; FLUORESCENCE; METHYLENE BLUE; MICROSPHERES; MICROWAVE RADIATION; NANOSTRUCTURES; PHOTOCATALYSIS; PHOTOLUMINESCENCE; SYNTHESIS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Deng, Chonghai, Department of Chemical and Materials Engineering, Hefei University, Hefei 230022, and Tian, Xiaobo. Facile microwave-assisted aqueous synthesis of CdS nanocrystals with their photocatalytic activities under visible lighting. United States: N. p., 2013. Web. doi:10.1016/J.MATERRESBULL.2013.07.019.
Deng, Chonghai, Department of Chemical and Materials Engineering, Hefei University, Hefei 230022, & Tian, Xiaobo. Facile microwave-assisted aqueous synthesis of CdS nanocrystals with their photocatalytic activities under visible lighting. United States. https://doi.org/10.1016/J.MATERRESBULL.2013.07.019
Deng, Chonghai, Department of Chemical and Materials Engineering, Hefei University, Hefei 230022, and Tian, Xiaobo. 2013. "Facile microwave-assisted aqueous synthesis of CdS nanocrystals with their photocatalytic activities under visible lighting". United States. https://doi.org/10.1016/J.MATERRESBULL.2013.07.019.
@article{osti_22285166,
title = {Facile microwave-assisted aqueous synthesis of CdS nanocrystals with their photocatalytic activities under visible lighting},
author = {Deng, Chonghai and Department of Chemical and Materials Engineering, Hefei University, Hefei 230022 and Tian, Xiaobo},
abstractNote = {Graphical abstract: - Highlights: • Three kinds of CdS nanostructures have been controllably synthesized. • Ethanediamine acts as a phase and morphology controlling reagent. • Three CdS nanostructures display high visible light photocatalytic activities. • Cubic CdS-3 shows superior photocatalytic activity to the other hexagonal CdS. • The growth processes for fabrication of CdS nanocrystals are also discussed. - Abstract: Three kinds of CdS nanostructures, that is, hexagonal nanospheres (CdS-1), hierarchical caterpillar-fungus-like hexagonal nanorods (CdS-2) and hierarchical cubic microspheres (CdS-3), were controllably synthesized by a facile and one-pot microwave-assisted aqueous chemical method using ethanediamine as a phase and morphology controlling reagent. The as-prepared products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectra (DRS) and photoluminescence (PL) spectra. The results show that CdS-1 is mainly composed of monodispersed hexagonal nanospheres with average diameters of about 100 nm; hexagonal CdS-2 has lengths in the range of 600–800 nm and diameters of 40–60 nm, assembled by nanoparticles about 20 nm in diameter; and CdS-3 is pure cubic microspheres with diameters in the range of 0.8–1.3 μm, aggregated by tiny nanograins with size of 5.8 nm. The band gap energies of CdS products were calculated to be 2.30, 2.31 and 2.24 eV observed from UV–vis DRS for CdS-1, CdS-2 and CdS-3, respectively. PL spectra of CdS samples showed that sphalerite CdS-3 possesses a very weak fluorescence, while wurtzite CdS-2 has a strongest green near-band edge emission (NBE) at 550 nm. The visible light photodegradation of methylene blue and rhodamine B in the presence of CdS photocatalysts illustrates that all of them display high photocatalytic activities. Significantly, the cubic CdS-3 exhibits more excellent photocatalytic behavior in degradation of organic dyes than the other hexagonal CdS, which is closely related to the phase and morphology structure of cubic CdS.},
doi = {10.1016/J.MATERRESBULL.2013.07.019},
url = {https://www.osti.gov/biblio/22285166}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 10,
volume = 48,
place = {United States},
year = {Tue Oct 15 00:00:00 EDT 2013},
month = {Tue Oct 15 00:00:00 EDT 2013}
}