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Role of Absorbing Nanocrystal Cores in Soft Photonic Crystals: A Spectroscopy and SANS Study

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Physical Chemistry I, Heinrich-Heine-University, 40225 Düsseldorf, Germany
Physical Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany
§ Department of Chemistry, University of Paderborn, 33098 Paderborn, Germany
Large Scale Structures Group, Institut Laue-Langevin, 38402 Grenoble, France
*E-mail: [email protected]. Phone: +49 (0)211 81 12400. Fax: +49 (0)211 81 12179. Home page: www.karg.hhu.de.
Cite this: Langmuir 2018, 34, 3, 854–867
Publication Date (Web):August 2, 2017
https://doi.org/10.1021/acs.langmuir.7b01595
Copyright © 2017 American Chemical Society

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    Abstract

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    Periodic superstructures of plasmonic nanoparticles have attracted significant interest because they can support coupled plasmonic modes, making them interesting for plasmonic lasing, metamaterials, and as light-management structures in thin-film optoelectronic devices. We have recently shown that noble metal hydrogel core–shell colloids allow for the fabrication of highly ordered 2-dimensional plasmonic lattices that show surface lattice resonances as the result of plasmonic/diffractive coupling (Volk, K.; Fitzgerald, J. P. S.; Ruckdeschel, P.; Retsch, M.; König, T. A. F.; Karg, M. Reversible Tuning of Visible Wavelength Surface Lattice Resonances in Self-Assembled Hybrid Monolayers. Adv. Optical Mater. 2017, 5, 1600971, DOI: 10.1002/adom.201600971). In the present work, we study the photonic properties and structure of 3-dimensional crystalline superstructures of gold hydrogel core–shell colloids and their pitted counterparts without gold cores. We use far-field extinction spectroscopy to investigate the optical response of these superstructures. Narrow Bragg peaks are measured, independently of the presence or absence of the gold cores. All crystals show a significant reduction in low-wavelength scattering. This leads to a significant enhancement of the plasmonic properties of the samples prepared from gold-nanoparticle-containing core–shell colloids. Plasmonic/diffractive coupling is not evident, which we mostly attribute to the relatively small size of the gold cores limiting the effective coupling strength. Small-angle neutron scattering is applied to study the crystal structure. Bragg peaks of several orders clearly assignable to an fcc arrangement of the particles are observed for all crystalline samples in a broad range of volume fractions. Our results indicate that the nanocrystal cores do not influence the overall crystallization behavior or the crystal structure. These are important prerequisites for future studies on photonic materials built from core–shell particles, in particular, the development of new photonic materials from plasmonic nanocrystals.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.langmuir.7b01595.

    • Theoretical background of SANS profiles of dilute samples. TEM investigation of the gold nanoparticle cores. Swelling behavior determined by light scattering. Radii of gyration from static light scattering. Angle-dependent dynamic light scattering. Electrophoretic mobilities of the microgel systems. Fitting procedure of the SANS data using SASfit. Analysis of dilute particle dispersions by UV–-vis absorbance spectroscopy. Determination of the residual water content by TGA. Determination of the molecular weight by UV–vis absorbance spectroscopy. Refractive index measurements. UV–vis absorbance spectra of the crystalline samples. Simulations of the 2D scattering patterns using Scatter. (PDF)

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    Cited By

    This article is cited by 9 publications.

    1. Yafei Wang, Yan Zhang, Ying Guan, Yongjun Zhang. Magnetic Field-Assisted Fast Assembly of Microgel Colloidal Crystals. Langmuir 2022, 38 (19) , 6057-6065. https://doi.org/10.1021/acs.langmuir.2c00297
    2. Marco Hildebrandt, Sergey Lazarev, Javier Pérez, Ivan A. Vartanyants, Janne-Mieke Meijer, Matthias Karg. SAXS Investigation of Core–Shell Microgels with High Scattering Contrast Cores: Access to Structure Factor and Volume Fraction. Macromolecules 2022, 55 (7) , 2959-2969. https://doi.org/10.1021/acs.macromol.2c00100
    3. Jie Guo, Jun Cheng, Hui Tan, Shengyu Zhu, Zhuhui Qiao, Jun Yang, Weimin Liu. Al-Doped Ga-Based Liquid Metal: Modification Strategy and Controllable High-Temperature Lubricity through Frictional Interface Regulation. Langmuir 2019, 35 (21) , 6905-6915. https://doi.org/10.1021/acs.langmuir.9b00780
    4. Matthias Karg, Andrij Pich, Thomas Hellweg, Todd Hoare, L. Andrew Lyon, J. J. Crassous, Daisuke Suzuki, Rustam A. Gumerov, Stefanie Schneider, Igor. I. Potemkin, Walter Richtering. Nanogels and Microgels: From Model Colloids to Applications, Recent Developments, and Future Trends. Langmuir 2019, 35 (19) , 6231-6255. https://doi.org/10.1021/acs.langmuir.8b04304
    5. Shuang Liang, Ying Guan, Yongjun Zhang. Layer-by-Layer Assembly of Microgel Colloidal Crystals via Photoinitiated Alkyne–Azide Click Reaction. ACS Omega 2019, 4 (3) , 5650-5660. https://doi.org/10.1021/acsomega.9b00354
    6. Masashi Hasegawa, Kanako Watanabe, Hikaru Namigata, Tom A.J. Welling, Keishi Suga, Daisuke Nagao. Surface lattice resonance in three-dimensional plasmonic arrays fabricated via self-assembly of silica-coated gold nanoparticles. Journal of Colloid and Interface Science 2023, 633 , 226-232. https://doi.org/10.1016/j.jcis.2022.11.077
    7. Déborah Feller, Matthias Karg. Fluid interface-assisted assembly of soft microgels: recent developments for structures beyond hexagonal packing. Soft Matter 2022, 18 (34) , 6301-6312. https://doi.org/10.1039/D2SM00872F
    8. Dmitry Lapkin, Nastasia Mukharamova, Dameli Assalauova, Svetlana Dubinina, Jens Stellhorn, Fabian Westermeier, Sergey Lazarev, Michael Sprung, Matthias Karg, Ivan A. Vartanyants, Janne-Mieke Meijer. In situ characterization of crystallization and melting of soft, thermoresponsive microgels by small-angle X-ray scattering. Soft Matter 2022, 18 (8) , 1591-1602. https://doi.org/10.1039/D1SM01537K
    9. Ekaterina Ponomareva, Ben Tadgell, Marco Hildebrandt, Marcel Krüsmann, Sylvain Prévost, Paul Mulvaney, Matthias Karg. The fuzzy sphere morphology is responsible for the increase in light scattering during the shrinkage of thermoresponsive microgels. Soft Matter 2022, 18 (4) , 807-825. https://doi.org/10.1039/D1SM01473K

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