Synthesis, morphological control, and antibacterial properties of hollow/solid Ag2S/Ag heterodimers

Handle URI:
http://hdl.handle.net/10754/575546
Title:
Synthesis, morphological control, and antibacterial properties of hollow/solid Ag2S/Ag heterodimers
Authors:
Pang, Maolin; Hu, Jiangyong; Zeng, Huachun
Abstract:
Ag2S and Ag are important functional materials that have received considerable research interest in recent years. In this work, we develop a solution-based synthetic method to combine these two materials into hollow/solid Ag2S/Ag heterodimers at room temperature. Starting from monodisperse Cu2O solid spheres, CuS hollow spheres can be converted from Cu2O through a modified Kirkendall process, and the obtained CuS can then be used as a solid precursor for preparation of the Ag2S/Ag heterodimers through ion exchange and photo-assisted reduction. We have found that formation of the Ag2S/Ag heterodimers is instantaneous, and the size of Ag nanocrystals on the hollow spheres of Ag2S can be controlled by changing the concentration and power of reducing agents in the synthesis. The growth of Ag nanoparticles on hollow spheres of Ag2S in the dimers is along the [111] direction of the silver crystal; the light absorption properties have also been investigated. Furthermore, coupling or tripling of Ag2S/Ag heterodimers into dumbbell-like trimers ((Ag 2S)2/Ag, linear) and triangular tetramers ((Ag 2S)3/Ag, coplanar) can also be attained at 60°C by adding the bidentate ligand ethylenediamine as a cross-linking agent. To test the applicability of this highly asymmetric dipolar composite, photocatalytic inactivation of Escherichia coli K-12 in the presence of the as-prepared Ag 2S/Ag heterodimers has been carried out under UV irradiation. The added Ag2S/Ag heterodimers show good chemical stability under prolonged UV irradiation, and no appreciable solid dissolution is found. Possible mechanisms regarding the enhanced antibacterial activity have also been addressed. © 2010 American Chemical Society.
KAUST Department:
KAUST-NUS GCR Program; Advanced Membranes and Porous Materials Research Center
Publisher:
American Chemical Society (ACS)
Journal:
Journal of the American Chemical Society
Issue Date:
11-Aug-2010
DOI:
10.1021/ja102105q
PubMed ID:
20681710
Type:
Article
ISSN:
00027863
Sponsors:
The authors gratefully acknowledge financial support provided by National University of Singapore, Economic Development Board, Singapore, and King Abdullah University of Science and Technology, Saudi Arabia. The authors also thank Ms. Xiaolan Tan of Division of Environmental Science and Engineering, Faculty of Engineering, National University of Singapore, for assistance with microbial experiments and discussion.
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorPang, Maolinen
dc.contributor.authorHu, Jiangyongen
dc.contributor.authorZeng, Huachunen
dc.date.accessioned2015-08-24T08:32:30Zen
dc.date.available2015-08-24T08:32:30Zen
dc.date.issued2010-08-11en
dc.identifier.issn00027863en
dc.identifier.pmid20681710en
dc.identifier.doi10.1021/ja102105qen
dc.identifier.urihttp://hdl.handle.net/10754/575546en
dc.description.abstractAg2S and Ag are important functional materials that have received considerable research interest in recent years. In this work, we develop a solution-based synthetic method to combine these two materials into hollow/solid Ag2S/Ag heterodimers at room temperature. Starting from monodisperse Cu2O solid spheres, CuS hollow spheres can be converted from Cu2O through a modified Kirkendall process, and the obtained CuS can then be used as a solid precursor for preparation of the Ag2S/Ag heterodimers through ion exchange and photo-assisted reduction. We have found that formation of the Ag2S/Ag heterodimers is instantaneous, and the size of Ag nanocrystals on the hollow spheres of Ag2S can be controlled by changing the concentration and power of reducing agents in the synthesis. The growth of Ag nanoparticles on hollow spheres of Ag2S in the dimers is along the [111] direction of the silver crystal; the light absorption properties have also been investigated. Furthermore, coupling or tripling of Ag2S/Ag heterodimers into dumbbell-like trimers ((Ag 2S)2/Ag, linear) and triangular tetramers ((Ag 2S)3/Ag, coplanar) can also be attained at 60°C by adding the bidentate ligand ethylenediamine as a cross-linking agent. To test the applicability of this highly asymmetric dipolar composite, photocatalytic inactivation of Escherichia coli K-12 in the presence of the as-prepared Ag 2S/Ag heterodimers has been carried out under UV irradiation. The added Ag2S/Ag heterodimers show good chemical stability under prolonged UV irradiation, and no appreciable solid dissolution is found. Possible mechanisms regarding the enhanced antibacterial activity have also been addressed. © 2010 American Chemical Society.en
dc.description.sponsorshipThe authors gratefully acknowledge financial support provided by National University of Singapore, Economic Development Board, Singapore, and King Abdullah University of Science and Technology, Saudi Arabia. The authors also thank Ms. Xiaolan Tan of Division of Environmental Science and Engineering, Faculty of Engineering, National University of Singapore, for assistance with microbial experiments and discussion.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleSynthesis, morphological control, and antibacterial properties of hollow/solid Ag2S/Ag heterodimersen
dc.typeArticleen
dc.contributor.departmentKAUST-NUS GCR Programen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.identifier.journalJournal of the American Chemical Societyen
dc.contributor.institutionDivision of Environmental Science and Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singaporeen
kaust.authorPang, Maolinen
kaust.authorZeng, Huachunen

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