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Formation, Optical Properties and Applications of Edge Gold-Coated Silver Nanoprisms

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Abstract

A facile, high-yield synthesis of edge gold-coated silver nanoprisms (GSNPs) with a gold nanoframe as thin as 1.7 nm and their comprehensive characterizations by using various spectroscopic and microscopic techniques is introduced. The GSNPs exhibit remarkably higher stability than silver nanoprisms (SNPs) and are therefore explored as effective optical antennae for light-harvesting applications. When embedded into a bulk heterojunctions film of P3HT:PCBM, plasmonic GSNPs with a localized surface plasmon resonance (LSPR) around 500 nm can effectively act as optical antennae to enhance light harvesting in the active layer. As a result, we measured up to 7-fold enhancement in the polaron generation yield through photoinduced absorption spectroscopy. Owing to the high stability and strong field enhancement, the presented GSNPs feature great potential as plasmonic probes for photovoltaic applications and LSPR sensing.

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acknowledgments

M.M.S. acknowledges the SINGA fellowship by Agency for Science, Technology and Research (A*STAR) and Nanyang Technological University Postdoctoral Fellowship supported by Institute of Nano-System Interface Science & Technology (INSIST). M. S. acknowledges primary support from a fellowship by the Portuguese Fundação para a Ciência e a Tecnologia (SFRH/BPD/71816/2010).

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Authors and Affiliations

  1. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA

    Mohammad M. Shahjamali & Negin Zaraee

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

    Mohammad M. Shahjamali

  3. Department of Chemistry, University of Washington, Seattle, Washington, 98195, USA

    Michael Salvador

  4. Instituto de Telecomunicações, Instituto Superior Técnico, Av. Rovisco Pais, P-1049-001, Lisboa, Portugal

    Michael Salvador

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  1. Mohammad M. Shahjamali
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Shahjamali, M.M., Salvador, M. & Zaraee, N. Formation, Optical Properties and Applications of Edge Gold-Coated Silver Nanoprisms. MRS Online Proceedings Library 1737, 44–52 (2014). https://doi.org/10.1557/opl.2015.581

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  • DOI: https://doi.org/10.1557/opl.2015.581

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