Author, as appears in the article.: Tebbe, Moritz; Kuttner, Christian; Mayer, Martin; Maennel, Max; Pazos-Perez, Nicolas; Koenig, Tobias A F; Fery, Andreas
Department: Química Física i Inorgànica
URV's Author/s: Pazos Pérez, Nicolás Carlos
Keywords: Surface-plasmon resonance Spectroscopy Shape control Seed-mediated growth Nanoparticles Metal nanostructures Iodide-ions High-yield synthesis Au Atomic-scale
Abstract: We investigate the effect of surfactant-mediated, asymmetric silver overgrowth of gold nanorods on their intrinsic optical properties. From concentration-dependent experiments, we established a close correlation of the extinction in the UV/vis/NIR frequency range and the morphological transition from gold nanorods to Au@Ag cuboids. Based on this correlation, a generic methodology for in situ monitoring of the evolution of the cuboid morphology was developed and applied in time-dependent experiments. We find that growth rates are sensitive to the substitution of the surfactant headgroup by comparison of benzylhexadecyldimethylammonium chloride (BDAC) with hexadecyltrimethylammonium chloride (CTAC). The time-dependent overgrowth in BDAC proceeds about 1 order of magnitude slower than in CTAC, which allows for higher control during silver overgrowth. Furthermore, silver overgrowth results in a qualitatively novel optical feature: Upon excitation inside the overlap region of the interband transition of gold and intraband of silver, the gold core acts as a retarding element. The much higher damping of the gold core compared to the silver shell in Au@Ag cuboids induces mirror charges at the core/shell interface as shown by electromagnetic simulations. Full control over the kinetic growth process consequently allows for precise tailoring of the resonance wavelengths of both modes. Tailored and asymmetric silver-overgrown gold nanorods are of particular interest for large-scale fabrication of nanoparticles with intrinsic metamaterial properties. These building blocks could furthermore find application in optical sensor technology, light harvesting, and information technology.
Thematic Areas: Surfaces, coatings and films Química Physical and theoretical chemistry Nanoscience and nanotechnology Nanoscience & nanotechnology Medicina ii Medicina i Materials science, multidisciplinary Materiais Interdisciplinar General energy Farmacia Ensino Engenharias iv Engenharias iii Engenharias ii Engenharias i Energy (miscellaneous) Energy (all) Electronic, optical and magnetic materials Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Chemistry, physical Biotecnología Biodiversidade Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: nicolas.pazos@urv.cat
Author identifier: 0000-0002-2326-4231
Record's date: 2024-11-02
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://pubs.acs.org/doi/10.1021/acs.jpcc.5b03155
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Journal Of Physical Chemistry c. 119 (17): 9513-9523
APA: Tebbe, Moritz; Kuttner, Christian; Mayer, Martin; Maennel, Max; Pazos-Perez, Nicolas; Koenig, Tobias A F; Fery, Andreas (2015). Silver-overgrowth-induced changes in intrinsic optical properties of gold nanorods: from noninvasive monitoring of growth kinetics to tailoring internal mirror charges. Journal Of Physical Chemistry c, 119(17), 9513-9523. DOI: 10.1021/acs.jpcc.5b03155
Article's DOI: 10.1021/acs.jpcc.5b03155
Entity: Universitat Rovira i Virgili
Journal publication year: 2015
Publication Type: Journal Publications