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Optically Anisotropic Substrates via Wrinkle-Assisted Convective Assembly of Gold Nanorods on Macroscopic Areas

Title data

Tebbe, Moritz ; Mayer, Martin ; Glatz, Bernhard A. ; Hanske, Christoph ; Probst, Patrick T. ; Müller, Mareen B. ; Karg, Matthias ; Chanana, Munish ; König, Tobias A. F. ; Kuttner, Christian ; Fery, Andreas:
Optically Anisotropic Substrates via Wrinkle-Assisted Convective Assembly of Gold Nanorods on Macroscopic Areas.
In: Faraday Discussions. (2014) .
ISSN 1359-6640
DOI: https://doi.org/10.1039/C4FD00236A

Official URL: Volltext

Project information

Project financing: 7. Forschungsrahmenprogramm für Forschung, technologische Entwicklung und Demonstration der Europäischen Union

Abstract in another language

We demonstrate the large-scale organisation of anisotropic nanoparticles into linear assemblies displaying optical anisotropy on macroscopic areas. Monodisperse gold nanorods with a hydrophilic protein shell are arranged by dip-coating on wrinkled surfaces and subsequently transferred to indium tin oxide (ITO) substrates by capillary transfer printing. We elucidate how tuning the wrinkle amplitude enables to precisely adjust the assembly morphology and fabricate single, double and triple nanorod lines. For the single lines, we quantify the order parameter of the assemblies as well as interparticle distances from scanning electron microscopy (SEM) images. We find an order parameter of 0.97 and a mean interparticle gap size of 7 nm. This combination of close to perfect uni-axial alignment and close-packing gives rise to pronounced macroscopic anisotropic optical properties due to strong plasmonic coupling. We characterise the optical response of the assemblies on ITO-coated glass via UV/vis/NIR spectroscopy and determine an optical order parameter of 0.91. The assemblies are thus plasmonic metamaterials, as their periodicity and building block sizes are well below the optical wavelength. The presented approach does not rely on lithographic patterning and provides access to functional materials, which could find application in subwavelength waveguiding, photovoltaics, and for large-area metamaterial fabrication.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Physical Chemistry II - Univ.-Prof. Dr. Andreas Fery
Profile Fields > Advanced Fields > Polymer and Colloid Science
Research Institutions > EU Research Projects > METAMECH - Template Assisted Assembly of Meta-Materials Using Mechanical Instabilities
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry II
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > EU Research Projects
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 530 Physics
500 Science > 540 Chemistry
Date Deposited: 19 Mar 2015 10:46
Last Modified: 19 Mar 2015 10:46
URI: https://eref.uni-bayreuth.de/id/eprint/8407