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Nanocomposites Based on Antiferroelectric Liquid Crystal (S)-MHPOBC Doping with Au Nanoparticles. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27123663. [PMID: 35744787 PMCID: PMC9230379 DOI: 10.3390/molecules27123663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/27/2022] [Accepted: 06/03/2022] [Indexed: 11/17/2022]
Abstract
Modification of the physical properties of the (S)-MHPOBC antiferroelectric liquid crystal (AFLC) by doping with low concentrations of gold nanoparticles is presented for the first time. We used several complementary experimental methods to determine the effect of Au nanoparticles on AFLC in the metal–organic composites. It was found that the dopant inhibits the matrix crystallization process and modifies the phase transitions temperatures and switching time, as well as increases the helical pitch and spontaneous polarization, while the tilt angle slightly changes. We also showed that both the LC matrix and Au nanoparticles show strong fluorescence in the green light range, and the contact angle depends on the temperature and dopant concentration.
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Zhao YY, Cao Y, Siligardi G, Mehl GH, Liu F, Ungar G. Self-assembly of gold nanoparticles into an adjustable plasmonic 3D lattice using Janus-type forked mesogenic ligands. Chem Asian J 2022; 17:e202200057. [PMID: 35192226 DOI: 10.1002/asia.202200057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 02/21/2022] [Indexed: 11/06/2022]
Abstract
We report the formation of a 3D body-centred self-assembled superlattice of gold nanoparticles whose interparticle gap, and hence its plasmonic properties, are adjustable exclusively in the xy -plane. Thus, even though the particles are spherical, their anisotropic packing generates tailorable plasmonic dichroism. The gold nanoparticles are coated with forked ligands containing two mesogens: either two cholesterols ("twin"), one cholesterol and one azobenzene ("Janus"), or a mixture of the two. Beside the body-centered arrangement of gold nanoparticles, the structure also contains unusual two-dimensionally modulated smectic-like layers of mesogens in an egg-box geometry. Moreover, the presence of azobenzene mesogens allows the superlattice to be melted through UV-induced photo-isomerization; the process is reversible displaying low fatigue on repeated cycling.
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Affiliation(s)
- Yang-Yang Zhao
- Xi'an Jiaotong University, Department of Chemistry, School of Science, West Xianning Road, 710049, Xi'an, CHINA
| | - Yu Cao
- Xi'an Jiaotong University, Department of Chemistry, School of Science, CHINA
| | | | - Georg H Mehl
- University of Hull, Department of Chemistry, UNITED KINGDOM
| | - Feng Liu
- Xi'an Jiaotong University, Department of Chemistry, School of Science, CHINA
| | - Goran Ungar
- University of Sheffield, Materials Science and Engineering, Sir Robert Hadfield Building, Mappin Street, S1 3JD, Sheffield, UNITED KINGDOM
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Parzyszek S, Pociecha D, Wolska JM, Lewandowski W. Thermomechanically controlled fluorescence anisotropy in thin films of InP/ZnS quantum dots. NANOSCALE ADVANCES 2021; 3:5387-5392. [PMID: 36132630 PMCID: PMC9418115 DOI: 10.1039/d1na00290b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 08/05/2021] [Indexed: 06/03/2023]
Abstract
Macroscopic scale sources of polarized light play a fundamental role in designing light-emitting devices. In this communication we report the formation of nano- and macro-scale ordered, layered assemblies of InP/ZnS quantum dots (QDs) exhibiting fluorescence anisotropy (FA), as well as thermo- and mechano-responsive properties. The long-range organization of small, quasi-isotropic nanoparticles was achieved by introducing liquid crystal molecules to the surface of QDs, without the need to use an organic matrix. Melting/crystallization of the ligand at 95 deg. C translated to a reversible reconfiguration of QDs thin film between 2D layered and body-centered cubic structures, characteristic for a temperature range below and above the melting point, respectively. The low-temperature, layered structure exhibited mechano-responsiveness which was key to introduce and control the sample alignment. Interestingly, transverse and parallel alignment modes of QDs layers were achieved, depending on the temperature of mechanical shearing. As prepared QD samples exhibited fluorescence anisotropy strongly correlated to the macroscopic orientation of the layers. Correlated small-angle X-ray diffraction (SAXRD) and fluorescence spectroscopy studies confirmed the mm-scale alignment of the thin films of QDs. Such films may be advantageous for developing efficient, densely packed, and uniform macro-scale FA sources.
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Affiliation(s)
- Sylwia Parzyszek
- Faculty of Chemistry, University of Warsaw Pasteura 1 st. 02-093 Warsaw Poland
| | - Damian Pociecha
- Faculty of Chemistry, University of Warsaw Pasteura 1 st. 02-093 Warsaw Poland
| | - Joanna Maria Wolska
- Faculty of Chemistry, University of Warsaw Pasteura 1 st. 02-093 Warsaw Poland
| | - Wiktor Lewandowski
- Faculty of Chemistry, University of Warsaw Pasteura 1 st. 02-093 Warsaw Poland
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Wolska JM, Błażejewska A, Tupikowska M, Pociecha D, Górecka E. Gold nanoparticles grafted with chemically incompatible ligands. RSC Adv 2021; 11:9568-9571. [PMID: 35423469 PMCID: PMC8695456 DOI: 10.1039/d1ra00547b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 05/05/2021] [Accepted: 02/22/2021] [Indexed: 01/25/2023] Open
Abstract
Janus-type structures were obtained from gold nanoparticles grafted with two types of chemically incompatible mesogenic ligands with a strong tendency for nano-segregation. A lamellar arrangement, in which metallic nanoparticle-rich sublayers are separated by organic ligand-rich sublayers of various composition, was formed due to the ligand segregation process. The layers could be easily aligned by mechanical shearing; for most materials the layer normal was parallel to the shearing direction but perpendicular to the shearing gradient, such transverse mode is only rarely observed for lamellar materials. Reversible changes of layer thickness under UV light were observed due to the presence of an azo-moiety in the organic ligand molecules.
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Affiliation(s)
- Joanna M Wolska
- Department of Chemistry, Warsaw University Pasteura 1 02-093 Warsaw Poland +48 22 822 0211
| | - Aleksandra Błażejewska
- Department of Chemistry, Warsaw University Pasteura 1 02-093 Warsaw Poland +48 22 822 0211
| | - Martyna Tupikowska
- Department of Chemistry, Warsaw University Pasteura 1 02-093 Warsaw Poland +48 22 822 0211
| | - Damian Pociecha
- Department of Chemistry, Warsaw University Pasteura 1 02-093 Warsaw Poland +48 22 822 0211
| | - Ewa Górecka
- Department of Chemistry, Warsaw University Pasteura 1 02-093 Warsaw Poland +48 22 822 0211
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Troha T, Kaspar M, Hamplova V, Cigl M, Havlicek J, Pociecha D, Novotna V. Silver Nanoparticles with Liquid Crystalline Ligands Based on Lactic Acid Derivatives. NANOMATERIALS 2019; 9:nano9081066. [PMID: 31349601 PMCID: PMC6723366 DOI: 10.3390/nano9081066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/17/2019] [Accepted: 07/19/2019] [Indexed: 12/18/2022]
Abstract
We have prepared and studied silver nanoparticles functionalized with ligands based on lactic acid derivatives. Several types of hybrid systems that differed in the size of silver nanoparticles as well as the length of surface ligands were analyzed. Transmission electron microscopy (TEM) observation provided information about the size and shape of nanoparticles and proved good homogeneity of studied systems. By dynamic light scattering (DLS) measurements, we have measured the size distribution of nanoparticle systems. Plasmonic resonance was detected at around 450 nm. For two hybrid systems, the mesomorphic behaviour has been demonstrated by x-ray measurements. The observed thermotropic liquid crystalline phases reveal lamellar character. We have proposed a model based on self-assembly of intercalated liquid crystalline ligands.
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Affiliation(s)
- Tinkara Troha
- Institute of Physics of the Czech Academy of Sciences, 18221 Prague, Czech Republic
| | - Miroslav Kaspar
- Institute of Physics of the Czech Academy of Sciences, 18221 Prague, Czech Republic
| | - Vera Hamplova
- Institute of Physics of the Czech Academy of Sciences, 18221 Prague, Czech Republic
| | - Martin Cigl
- Institute of Physics of the Czech Academy of Sciences, 18221 Prague, Czech Republic
| | - Jaroslav Havlicek
- Institute of Physics of the Czech Academy of Sciences, 18221 Prague, Czech Republic
| | - Damian Pociecha
- Faculty of Chemistry, University of Warsaw, ul. Zwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Vladimira Novotna
- Institute of Physics of the Czech Academy of Sciences, 18221 Prague, Czech Republic.
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Hsu SW, Xu T. Tailoring Co-assembly of Nanodiscs and Block Copolymer-Based Supramolecules by Manipulating Interparticle Interactions. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00069] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
| | - Ting Xu
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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Modifying Thermal Switchability of Liquid Crystalline Nanoparticles by Alkyl Ligands Variation. NANOMATERIALS 2018. [PMID: 29518916 PMCID: PMC5869638 DOI: 10.3390/nano8030147] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
By coating plasmonic nanoparticles (NPs) with thermally responsive liquid crystals (LCs) it is possible to prepare reversibly reconfigurable plasmonic nanomaterials with prospective applications in optoelectronic devices. However, simple and versatile methods to precisely tailor properties of liquid-crystalline nanoparticles (LC NPs) are still required. Here, we report a new method for tuning structural properties of assemblies of nanoparticles grafted with a mixture of promesogenic and alkyl thiols, by varying design of the latter. As a model system, we used Ag and Au nanoparticles that were coated with three-ring promesogenic molecules and dodecanethiol ligand. These LC NPs self-assemble into switchable lamellar (Ag NPs) or tetragonal (Au NPs) aggregates, as determined with small angle X-ray diffraction and transmission electron microscopy. Reconfigurable assemblies of Au NPs with different unit cell symmetry (orthorombic) are formed if hexadecanethiol and 1H,1H,2H,2H-perfluorodecanethiol were used in the place of dodecanethiol; in the case of Ag NPs the use of 11-hydroxyundecanethiol promotes formation of a lamellar structure as in the reference system, although with substantially broader range of thermal stability (140 vs. 90 °C). Our results underline the importance of alkyl ligand functionalities in determining structural properties of liquid-crystalline nanoparticles, and, more generally, broaden the scope of synthetic tools available for tailoring properties of reversibly reconfigurable plasmonic nanomaterials.
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Hsu SW, Rodarte AL, Som M, Arya G, Tao AR. Colloidal Plasmonic Nanocomposites: From Fabrication to Optical Function. Chem Rev 2018; 118:3100-3120. [DOI: 10.1021/acs.chemrev.7b00364] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Su-Wen Hsu
- Department of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, MC 0448, La Jolla, California 92039-0448, United States
| | - Andrea L. Rodarte
- Department of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, MC 0448, La Jolla, California 92039-0448, United States
| | - Madhura Som
- Department of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, MC 0448, La Jolla, California 92039-0448, United States
| | - Gaurav Arya
- Department of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, MC 0448, La Jolla, California 92039-0448, United States
| | - Andrea R. Tao
- Department of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, MC 0448, La Jolla, California 92039-0448, United States
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Lewandowski W, Łojewska T, Szustakiewicz P, Mieczkowski J, Pociecha D. Reversible switching of structural and plasmonic properties of liquid-crystalline gold nanoparticle assemblies. NANOSCALE 2016; 8:2656-63. [PMID: 26758794 DOI: 10.1039/c5nr08406g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Hybrid materials built of spherical gold nanoparticles with three different sizes covered with (pro)mesogenic molecules have been prepared. Small-angle X-ray diffraction studies showed that after thermal annealing most of the obtained materials formed long-range ordered assemblies. Variation of the (pro)mesogenic ligand architecture enabled us to achieve a switchable material, which could be reversibly reconfigured between 3D long-range ordered structures with tetragonal and face centred cubic symmetries. This structural reconfiguration induces changes to the plasmonic response of the material. This work demonstrates that it is possible to use LC-based self-assembling phenomena to prepare dynamic materials with structural properties important for the development of active plasmonic metamaterials.
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Affiliation(s)
- W Lewandowski
- Faculty of Chemistry, University of Warsaw, 1 Pasteura st., 02-093 Warsaw, Poland.
| | - T Łojewska
- Faculty of Chemistry, University of Warsaw, 1 Pasteura st., 02-093 Warsaw, Poland.
| | - P Szustakiewicz
- Faculty of Chemistry, University of Warsaw, 1 Pasteura st., 02-093 Warsaw, Poland.
| | - J Mieczkowski
- Faculty of Chemistry, University of Warsaw, 1 Pasteura st., 02-093 Warsaw, Poland.
| | - D Pociecha
- Faculty of Chemistry, University of Warsaw, 1 Pasteura st., 02-093 Warsaw, Poland.
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Nguyen TT, Albert S, Nguyen TLA, Deschenaux R. Liquid-crystalline fullerene-gold nanoparticles. RSC Adv 2015. [DOI: 10.1039/c5ra03046c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Liquid-crystalline [60]fullerene–gold nanoparticles were prepared by applying click chemistry. The materials display the smectic A phase and a good thermal stability.
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Affiliation(s)
| | - Steeve Albert
- Institut de Chimie
- Université de Neuchâtel
- 2000 Neuchâtel
- Switzerland
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