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Gold Coating of Silver Nanoprisms

机译：银纳米棱镜的金涂层

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摘要

Core-shell Ag@Au nanoprisms are prepared through a surfactant-free seed-mediated approach by taking advantage of the anisotropic structure of silver nanoprisms as seeds. The gold coating on the silver nanoprism surface is achieved by using hydroxylamine as a mild reducing agent, and the final fully gold-coated prism structures are confirmed by microscopic and spectroscopic characterization. The resulting Ag@Au core-shell structure preserves the optical signatures of nanoprisms and offers versatile functionality and particularly better stability against oxidation than the bare silver nanoprism. The surface plasmon resonances of the core-shell Ag@Au nanoprisms can be tuned throughout the visible and near-IR range as a function of the Au shell thickness. Such tailorable optical features and surfactant-free gold shells have great potential applications in biosensing and bioimaging.
机译：通过利用银纳米棱镜的各向异性结构作为种子，通过无表面活性剂的种子介导方法制备了核-壳型Ag @ Au纳米棱镜。通过使用羟胺作为温和的还原剂在银纳米棱镜表面上镀金，并通过显微镜和光谱表征确定了最终的全金镀膜棱镜结构。所得的Ag @ Au核-壳结构保留了纳米棱镜的光学特征，并且提供了比裸银纳米棱镜更通用的功能，并且具有更好的抗氧化稳定性。可以在整个可见光范围和近红外范围内根据Au壳层厚度对Ag-Au纳米壳核的表面等离子体共振进行调谐。这种可定制的光学特征和不含表面活性剂的金壳在生物传感和生物成像中具有巨大的潜在应用。

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  • 来源
    《Advanced Functional Materials》 |2012年第4期|p.849-854|共6页
  • 作者

    Mohammad Mehdi Shahjamali; Michel Bosman; Shaowen Cao; Xiao Huang; Somaye Saadat; Erik Martinsson; Daniel Aili; Yee Yan Tay; Bo Liedberg; Say Chye Joachim Loo; Hua Zhang; Freddy Boey; Can Xue;

  • 作者单位

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    Institute of Materials Research and Engineering A*STAR, 3 Research Link, 117602, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    Division of Molecular Physics Department of Physics Chemistry and Biology Linkoeping University SE-581 83 Linkoeping, Sweden;

    Division of Molecular Physics Department of Physics Chemistry and Biology Linkoeping University SE-581 83 Linkoeping, Sweden;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    Division of Molecular Physics Department of Physics Chemistry and Biology Linkoeping University SE-581 83 Linkoeping, Sweden;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

    School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue, 639798, Singapore;

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