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

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    Type
    Article
    Authors
    Pang, Maolin cc
    Hu, Jiangyong
    Zeng, Huachun
    KAUST Department
    KAUST-NUS GCR Program
    Advanced Membranes and Porous Materials Research Center
    Date
    2010-08-11
    Permanent link to this record
    http://hdl.handle.net/10754/575546
    
    Metadata
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    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.
    Citation
    Pang, M., Hu, J., & Zeng, H. C. (2010). Synthesis, Morphological Control, and Antibacterial Properties of Hollow/Solid Ag2S/Ag Heterodimers. Journal of the American Chemical Society, 132(31), 10771–10785. doi:10.1021/ja102105q
    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.
    Publisher
    American Chemical Society (ACS)
    Journal
    Journal of the American Chemical Society
    DOI
    10.1021/ja102105q
    PubMed ID
    20681710
    ae974a485f413a2113503eed53cd6c53
    10.1021/ja102105q
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center

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