Oriented Gold Nanorods and Gold Nanorod Chains within Smectic Liquid Crystal Topological Defects

Brigita Rožič, Jérôme Fresnais, Celine Molinaro, Joseph Calixte, Shivakumar Umadevi, Stephanie Lau-Truong, Nordin Felidj, Tobias Kraus, Fabrice Charra, Vincent Dupuis, Torsten Hegmann, Celine Fiorini-Debuisschert, Bruno Gallas, Emmanuelle Lacaze

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

We show that the use of oriented linear arrays of smectic A defects, the so-called smectic oily streaks, enables the orientation of gold nanorods (GNRs) for a large range of GNR diameters, ranging from 7 to 48 nm, and for various ligands. For the small GNRs it enables oriented end-to-end small chains of GNRs when the density is increased from around 2 GNRs/μm 2 to around 6 GNRs/μm 2. We have characterized the orientation of single GNRs by spectrophotometry and two-photon luminescence (TPL). A strongly anisotropic absorption of the composites and an on-off switching of GNR luminescence, both controlled by incident light polarization, are observed, revealing an orientation of the GNRs mostly parallel to the oily streaks. A more favorable trapping of GNRs by smectic dislocations with respect to ribbon-like defects is thus demonstrated. The dislocations appear to be localized at a specific localization, namely, the summit of rotating grain boundaries. Combining plasmonic absorption measurements, TPL measurements, and simulation of the plasmonic absorption, we show that the end-to-end GNR chains are both dimers and trimers, all parallel to each other, with a small gap between the coupled GNRs, on the order of 1.5 nm, thus associated with a large red-shift of 110 nm of the longitudinal plasmonic mode. A motion of the GNRs along the dislocations appears as a necessary ingredient for the formation of end-to-end GNR chains, the gap value being driven by the balance between the attracting van der Waals interactions and the steric repulsion between the GNRs and leading to interdigitation of the neighboring ligands. We thus obtain electromagnetic coupling of nanorods controlled by light polarization.

langueAnglais
Pages6728-6738
Nombre de pages11
journalACS nano
Volume11
Numéro7
Les DOIs
étatPublié - 25 juil. 2017
Modification externeOui

Empreinte digitale

Smectic liquid crystals
Crystal defects
Nanorods
crystal defects
Gold
nanorods
liquid crystals
gold
Luminescence
Light polarization
luminescence
Photons
Ligands
Electromagnetic coupling
electromagnetic coupling
Defects
ligands

mots-clés

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    Rožič, B., Fresnais, J., Molinaro, C., Calixte, J., Umadevi, S., Lau-Truong, S., ... Lacaze, E. (2017). Oriented Gold Nanorods and Gold Nanorod Chains within Smectic Liquid Crystal Topological Defects. ACS nano, 11(7), 6728-6738. https://doi.org/10.1021/acsnano.7b01132
    Rožič, Brigita ; Fresnais, Jérôme ; Molinaro, Celine ; Calixte, Joseph ; Umadevi, Shivakumar ; Lau-Truong, Stephanie ; Felidj, Nordin ; Kraus, Tobias ; Charra, Fabrice ; Dupuis, Vincent ; Hegmann, Torsten ; Fiorini-Debuisschert, Celine ; Gallas, Bruno ; Lacaze, Emmanuelle. / Oriented Gold Nanorods and Gold Nanorod Chains within Smectic Liquid Crystal Topological Defects. Dans: ACS nano. 2017 ; Vol 11, Numéro 7. p. 6728-6738.
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    abstract = "We show that the use of oriented linear arrays of smectic A defects, the so-called smectic oily streaks, enables the orientation of gold nanorods (GNRs) for a large range of GNR diameters, ranging from 7 to 48 nm, and for various ligands. For the small GNRs it enables oriented end-to-end small chains of GNRs when the density is increased from around 2 GNRs/μm 2 to around 6 GNRs/μm 2. We have characterized the orientation of single GNRs by spectrophotometry and two-photon luminescence (TPL). A strongly anisotropic absorption of the composites and an on-off switching of GNR luminescence, both controlled by incident light polarization, are observed, revealing an orientation of the GNRs mostly parallel to the oily streaks. A more favorable trapping of GNRs by smectic dislocations with respect to ribbon-like defects is thus demonstrated. The dislocations appear to be localized at a specific localization, namely, the summit of rotating grain boundaries. Combining plasmonic absorption measurements, TPL measurements, and simulation of the plasmonic absorption, we show that the end-to-end GNR chains are both dimers and trimers, all parallel to each other, with a small gap between the coupled GNRs, on the order of 1.5 nm, thus associated with a large red-shift of 110 nm of the longitudinal plasmonic mode. A motion of the GNRs along the dislocations appears as a necessary ingredient for the formation of end-to-end GNR chains, the gap value being driven by the balance between the attracting van der Waals interactions and the steric repulsion between the GNRs and leading to interdigitation of the neighboring ligands. We thus obtain electromagnetic coupling of nanorods controlled by light polarization.",
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    Rožič, B, Fresnais, J, Molinaro, C, Calixte, J, Umadevi, S, Lau-Truong, S, Felidj, N, Kraus, T, Charra, F, Dupuis, V, Hegmann, T, Fiorini-Debuisschert, C, Gallas, B & Lacaze, E 2017, 'Oriented Gold Nanorods and Gold Nanorod Chains within Smectic Liquid Crystal Topological Defects' ACS nano, VOL. 11, Numéro 7, p. 6728-6738. https://doi.org/10.1021/acsnano.7b01132

    Oriented Gold Nanorods and Gold Nanorod Chains within Smectic Liquid Crystal Topological Defects. / Rožič, Brigita; Fresnais, Jérôme; Molinaro, Celine; Calixte, Joseph; Umadevi, Shivakumar; Lau-Truong, Stephanie; Felidj, Nordin; Kraus, Tobias; Charra, Fabrice; Dupuis, Vincent; Hegmann, Torsten; Fiorini-Debuisschert, Celine; Gallas, Bruno; Lacaze, Emmanuelle.

    Dans: ACS nano, Vol 11, Numéro 7, 25.07.2017, p. 6728-6738.

    Résultats de recherche: Contribution à un journal/une revueArticle

    TY - JOUR

    T1 - Oriented Gold Nanorods and Gold Nanorod Chains within Smectic Liquid Crystal Topological Defects

    AU - Rožič, Brigita

    AU - Fresnais, Jérôme

    AU - Molinaro, Celine

    AU - Calixte, Joseph

    AU - Umadevi, Shivakumar

    AU - Lau-Truong, Stephanie

    AU - Felidj, Nordin

    AU - Kraus, Tobias

    AU - Charra, Fabrice

    AU - Dupuis, Vincent

    AU - Hegmann, Torsten

    AU - Fiorini-Debuisschert, Celine

    AU - Gallas, Bruno

    AU - Lacaze, Emmanuelle

    N1 - doi: 10.1021/acsnano.7b01132

    PY - 2017/7/25

    Y1 - 2017/7/25

    N2 - We show that the use of oriented linear arrays of smectic A defects, the so-called smectic oily streaks, enables the orientation of gold nanorods (GNRs) for a large range of GNR diameters, ranging from 7 to 48 nm, and for various ligands. For the small GNRs it enables oriented end-to-end small chains of GNRs when the density is increased from around 2 GNRs/μm 2 to around 6 GNRs/μm 2. We have characterized the orientation of single GNRs by spectrophotometry and two-photon luminescence (TPL). A strongly anisotropic absorption of the composites and an on-off switching of GNR luminescence, both controlled by incident light polarization, are observed, revealing an orientation of the GNRs mostly parallel to the oily streaks. A more favorable trapping of GNRs by smectic dislocations with respect to ribbon-like defects is thus demonstrated. The dislocations appear to be localized at a specific localization, namely, the summit of rotating grain boundaries. Combining plasmonic absorption measurements, TPL measurements, and simulation of the plasmonic absorption, we show that the end-to-end GNR chains are both dimers and trimers, all parallel to each other, with a small gap between the coupled GNRs, on the order of 1.5 nm, thus associated with a large red-shift of 110 nm of the longitudinal plasmonic mode. A motion of the GNRs along the dislocations appears as a necessary ingredient for the formation of end-to-end GNR chains, the gap value being driven by the balance between the attracting van der Waals interactions and the steric repulsion between the GNRs and leading to interdigitation of the neighboring ligands. We thus obtain electromagnetic coupling of nanorods controlled by light polarization.

    AB - We show that the use of oriented linear arrays of smectic A defects, the so-called smectic oily streaks, enables the orientation of gold nanorods (GNRs) for a large range of GNR diameters, ranging from 7 to 48 nm, and for various ligands. For the small GNRs it enables oriented end-to-end small chains of GNRs when the density is increased from around 2 GNRs/μm 2 to around 6 GNRs/μm 2. We have characterized the orientation of single GNRs by spectrophotometry and two-photon luminescence (TPL). A strongly anisotropic absorption of the composites and an on-off switching of GNR luminescence, both controlled by incident light polarization, are observed, revealing an orientation of the GNRs mostly parallel to the oily streaks. A more favorable trapping of GNRs by smectic dislocations with respect to ribbon-like defects is thus demonstrated. The dislocations appear to be localized at a specific localization, namely, the summit of rotating grain boundaries. Combining plasmonic absorption measurements, TPL measurements, and simulation of the plasmonic absorption, we show that the end-to-end GNR chains are both dimers and trimers, all parallel to each other, with a small gap between the coupled GNRs, on the order of 1.5 nm, thus associated with a large red-shift of 110 nm of the longitudinal plasmonic mode. A motion of the GNRs along the dislocations appears as a necessary ingredient for the formation of end-to-end GNR chains, the gap value being driven by the balance between the attracting van der Waals interactions and the steric repulsion between the GNRs and leading to interdigitation of the neighboring ligands. We thus obtain electromagnetic coupling of nanorods controlled by light polarization.

    KW - end-to-end chains

    KW - gold nanorods

    KW - plasmon resonances

    KW - smectic liquid crystal

    KW - spectrophotometry

    KW - two-photon luminescence microscopy

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    U2 - 10.1021/acsnano.7b01132

    DO - 10.1021/acsnano.7b01132

    M3 - Article

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    SP - 6728

    EP - 6738

    JO - ACS nano

    T2 - ACS nano

    JF - ACS nano

    SN - 1936-0851

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