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Thematische Bibliographien / Nanostructures achirales / Zeitschriftenartikel

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Zeitschriftenartikel zum Thema „Nanostructures achirales“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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1

Sang, Yutao, Pengfei Duan und Minghua Liu. „Nanotrumpets and circularly polarized luminescent nanotwists hierarchically self-assembled from an achiralC3-symmetric ester“. Chemical Communications 54, Nr. 32 (2018): 4025–28. http://dx.doi.org/10.1039/c8cc02130a.

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An achiralC₃-symmetric molecule was found to self-assemble into various hierarchical nanostructures such as nanotwists, nanotrumpets and nanobelts, in which the twisted fibers showed supramolecular chirality as well as circularly polarized luminescence although the compound is achiral.

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2

Liu, Changxia, Dong Yang, Li Zhang und Minghua Liu. „Water inversed helicity of nanostructures from ionic self-assembly of a chiral gelator and an achiral component“. Soft Matter 15, Nr. 32 (2019): 6557–63. http://dx.doi.org/10.1039/c9sm01176e.

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The ISA of a chiral gelator and an achiral component exhibited a left-handed helical nanostructure in ethanol. The formed helical nanostructures can be inverted by adding water to the ethanol solvent.

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3

Jin, Lei, Xiongyu Liang, Chengmao He, Tiejun Wang, Kun Liang und Li Yu. „Plasmon—Assisted Resonance Energy Transfer Involving Electric and Magnetic Coupling“. Electronics 13, Nr. 8 (19.04.2024): 1566. http://dx.doi.org/10.3390/electronics13081566.

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We develop a quantum theory based on macroscopic quantum electrodynamics to research the resonance energy transfer (RET) between a chiral donor and acceptor. It differs from the previous Green function approach which needs specific boundary conditions to obtain an analytical solution for calculating the RET rate. Our theory can combine the finite-difference time-domain (FDTD) method, which gives a simple and efficient semi-analytical approach, to evaluate the chiral RET rate in an arbitrary plasmonic nanosystem. Applying our theory to the systems of chiral molecules 3-methylcyclopentanone (3MCP) near the achiral/chiral plasmonic nanostructures, the RET process, which is divided into nondiscriminatory and discriminatory parts, is investigated. We find that plasmon will enhance both nondiscriminatory and discriminatory rates compared to the absence of plasmonic nanostructure, but the plasmon supported by chiral nanostructure contributes more to the discriminatory rate. The ratio of discriminatory to nondiscriminatory rates in the system consisting of 3MCP and chiral plasmonic structure is five-fold compared to the system consisting of 3MCP and achiral plasmonic structure. The phenomena can be attributed to the chiral electric-magnetic coupling. Our findings are important in understanding the achiral and chiral electric-magnetic interaction and designing chiral light-harvesting and sensing devices.

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4

SONG, XIN, HUIHUI KONG, LACHENG LIU, XIAOQING LIU, MINGDONG DONG und LI WANG. „TERRACE INDUCED HOMOCHIRAL SELF-ASSEMBLY OF ZINC PHTHALOCYANINEON COPPER (111) SURFACE“. Surface Review and Letters 23, Nr. 06 (17.11.2016): 1650047. http://dx.doi.org/10.1142/s0218625x16500475.

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It is still a challenge to find a suitable method to fabricate a well-defined homochiral surface from achiral molecules, and one of the possible methods is to modify surfaces with organic molecular assemblies. Large-area chiral self-assembly nanostructures have been observed at room temperature by depositing ZnPc molecules on a Cu(111) surface. The growth process has been investigated. ZnPc molecules get adsorbed first at the terrace steps, and then extend over the lower terrace until the whole terrace is covered with ZnPc molecules; such growth process would be stopped when the self-assembly nanostructure run into a decorated upper terrace step edge. We found that the terrace steps with specific directions with respect to the close-packed directions of the substrate can induce homochiral self-assembly on the lower terraces. So we can propose a possible way to fabricate a well-defined homochiral surface from achiral organic molecules.

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5

Fang, Chen, Qing Chai, Ye Chen, Yan Xing und Zaifa Zhou. „The chiral coating on an achiral nanostructure by the secondary effect in focused ion beam induced deposition“. Nanotechnology 33, Nr. 13 (05.01.2022): 135301. http://dx.doi.org/10.1088/1361-6528/ac4308.

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Abstract Optical metamaterials are widely used in electromagnetic wave modulation due to their sub-wavelength feature sizes. In this paper, a method to plate an achiral nanopillar array with chiral coating by the secondary effect in focused ion beam induced deposition is proposed. Guided by the pattern defined in a bitmap with variable residence time, the beam scan strategy suppresses the interaction between adjacent nanostructures. A uniform chiral coating is formed on the target nanostructure without affecting the adjacent nanostructure, under carefully selected beam parameters and the rotation angle of the sample stage. Energy dispersive x-ray spectroscopy results show that the chiral film has high purity metal, which enables the generation of localized surface plasmon resonances and causes the circular dichroism (CD) under circularly polarized light illumination. Finally, the tailorable CD spectrum of the coated array is verified by the finite difference time domain method.

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6

Petronijevic, Emilija, Alessandro Belardini, Hari Prasath Ram Kumar, Grigore Leahu, Roberto Li Voti und Concita Sibilia. „Extrinsic chirality in metasurfaces: Traditional and unconventional experiments – INVITED“. EPJ Web of Conferences 287 (2023): 12001. http://dx.doi.org/10.1051/epjconf/202328712001.

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Plasmonic nanostructures with achiral, but asymmetric shapes can exhibit chiro-optical phenomena at the nanoscale, given that the nanostructure-light interaction symmetry is broken. Such behaviour is defined as extrinsic chirality, and it is induced by properly arranging the experimental set-up. We show measurement techniques for extrinsic chirality in low-cost, asymmetric samples with nanostructures organized in metasurfaces. We employ widely tuneable chiro-optical characterization of transmission and reflection, as well as the circular polarization degree of the transmitted signal; near-infrared range (680-1080nm) and oblique incidence allow for the detection of resonant features in extrinsic chirality. Other, unconventional experiments use photo-thermal consequences of chirality governed absorption in metasurfaces. Photo-acoustic spectroscopy directly gives circular dichroism as a differential absorption of the left and right circular polarizations exciting the sample. Photo-deflection spectroscopy gives additional information of diffraction phenomena governed by the extrinsic chirality. We showed that these techniques can monitor the extrinsic chiral behaviour of the hybrid plasmonic metamaterials. Moreover, they can be used in combination with fluorescence-detected circular dichroism to measure the emission properties of fluorescent materials.

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7

Hu, Yi, Shaogang Xu, Kai Miao, Xinrui Miao und Wenli Deng. „Same building block, but diverse surface-confined self-assemblies: solvent and concentration effects-induced structural diversity towards chirality and achirality“. Physical Chemistry Chemical Physics 20, Nr. 25 (2018): 17367–79. http://dx.doi.org/10.1039/c8cp01308j.

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8

Hu, Yi, Kai Miao, Shan Peng, Bao Zha, Li Xu, Xinrui Miao und Wenli Deng. „Structural transition control between dipole–dipole and hydrogen bonds induced chirality and achirality“. CrystEngComm 18, Nr. 17 (2016): 3019–32. http://dx.doi.org/10.1039/c5ce02321a.

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9

Liu, Guofeng, Jinying Liu, Chuanliang Feng und Yanli Zhao. „Unexpected right-handed helical nanostructures co-assembled from l-phenylalanine derivatives and achiral bipyridines“. Chemical Science 8, Nr. 3 (2017): 1769–75. http://dx.doi.org/10.1039/c6sc04808k.

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Achiral bipyridines can co-assemble with l-phenylalanine derivatives into unexpected right-handed helical nanostructures rather than left-handed helix by utilizing intermolecular hydrogen bonding formed between pyridyl and carboxylic groups.

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10

Li, Hanbo, Xinshuang Gao, Chenqi Zhang, Yinglu Ji, Zhijian Hu und Xiaochun Wu. „Gold-Nanoparticle-Based Chiral Plasmonic Nanostructures and Their Biomedical Applications“. Biosensors 12, Nr. 11 (01.11.2022): 957. http://dx.doi.org/10.3390/bios12110957.

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As chiral antennas, plasmonic nanoparticles (NPs) can enhance chiral responses of chiral materials by forming hybrid structures and improving their own chirality preference as well. Chirality-dependent properties of plasmonic NPs broaden application potentials of chiral nanostructures in the biomedical field. Herein, we review the wet-chemical synthesis and self-assembly fabrication of gold-NP-based chiral nanostructures. Discrete chiral NPs are mainly obtained via the seed-mediated growth of achiral gold NPs under the guide of chiral molecules during growth. Irradiation with chiral light during growth is demonstrated to be a promising method for chirality control. Chiral assemblies are fabricated via the bottom-up assembly of achiral gold NPs using chiral linkers or guided by chiral templates, which exhibit large chiroplasmonic activities. In describing recent advances, emphasis is placed on the design and synthesis of chiral nanostructures with the tuning and amplification of plasmonic circular dichroism responses. In addition, the review discusses the most recent or even emerging trends in biomedical fields from biosensing and imaging to disease diagnosis and therapy.

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11

Yeom, Bongjun, Huanan Zhang, Hui Zhang, Jai Il Park, Kyoungwon Kim, Alexander O. Govorov und Nicholas A. Kotov. „Chiral Plasmonic Nanostructures on Achiral Nanopillars“. Nano Letters 13, Nr. 11 (22.10.2013): 5277–83. http://dx.doi.org/10.1021/nl402782d.

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12

Judai, Ken, Yoshikiyo Hatakeyama und Junichi Nishijo. „Helical Nanostructure of Achiral Silver p-Tolylacetylide Molecules“. Journal of Nanoscience 2013 (26.09.2013): 1–3. http://dx.doi.org/10.1155/2013/545430.

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Silver p-tolylacetylide is an achiral molecule; however, its nanostructure has been found to consist of twisted nanoribbons. The twisted ribbon is a helicoid that combines translation and perpendicular rotation along the ribbon axis. A helix, a typical chiral structure, can be created by the aggregation of achiral molecules, and the recrystallization conditions control the twist of the nanoribbons. Therefore, the recrystallization controls the chirality.

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13

He, Xiaorong, Qikai Li, Yuliang Li, Ning Wang, Yabin Song, Xiaofeng Liu, Mingjian Yuan et al. „Spontaneously Aggregated Chiral Nanostructures from Achiral Tripod−Terpyridine“. Journal of Physical Chemistry B 111, Nr. 28 (Juli 2007): 8063–68. http://dx.doi.org/10.1021/jp071706j.

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14

Yang, Tao, Haiyan Xue, Ruifang Cao und Weihua Li. „Formation of homochiral helical nanostructures in diblock copolymers under the confinement of nanopores“. Physical Chemistry Chemical Physics 21, Nr. 13 (2019): 7067–74. http://dx.doi.org/10.1039/c9cp00227h.

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15

Hashiyada, Shun, Tetsuya Narushima und Hiromi Okamoto. „Local Optical Activity in Achiral Two-Dimensional Gold Nanostructures“. Journal of Physical Chemistry C 118, Nr. 38 (16.09.2014): 22229–33. http://dx.doi.org/10.1021/jp507168a.

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16

Urban, Maximilian J., Chenqi Shen, Xiang-Tian Kong, Chenggan Zhu, Alexander O. Govorov, Qiangbin Wang, Mario Hentschel und Na Liu. „Chiral Plasmonic Nanostructures Enabled by Bottom-Up Approaches“. Annual Review of Physical Chemistry 70, Nr. 1 (14.06.2019): 275–99. http://dx.doi.org/10.1146/annurev-physchem-050317-021332.

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We present a comprehensive review of recent developments in the field of chiral plasmonics. Significant advances have been made recently in understanding the working principles of chiral plasmonic structures. With advances in micro- and nanofabrication techniques, a variety of chiral plasmonic nanostructures have been experimentally realized; these tailored chiroptical properties vastly outperform those of their molecular counterparts. We focus on chiral plasmonic nanostructures created using bottom-up approaches, which not only allow for rational design and fabrication but most intriguingly in many cases also enable dynamic manipulation and tuning of chiroptical responses. We first discuss plasmon-induced chirality, resulting from the interaction of chiral molecules with plasmonic excitations. Subsequently, we discuss intrinsically chiral colloids, which give rise to optical chirality owing to their chiral shapes. Finally, we discuss plasmonic chirality, achieved by arranging achiral plasmonic particles into handed configurations on static or active templates. Chiral plasmonic nanostructures are very promising candidates for real-life applications owing to their significantly larger optical chirality than natural molecules. In addition, chiral plasmonic nanostructures offer engineerable and dynamic chiroptical responses, which are formidable to achieve in molecular systems. We thus anticipate that the field of chiral plasmonics will attract further widespread attention in applications ranging from enantioselective analysis to chiral sensing, structural determination, and in situ ultrasensitive detection of multiple disease biomarkers, as well as optical monitoring of transmembrane transport and intracellular metabolism.

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17

Lu, Jia En, Chou-Hsun Yang, Haobin Wang, ChiYung Yam, Zhi-Gang Yu und Shaowei Chen. „Plasmonic circular dichroism of vesicle-like nanostructures by the template-less self-assembly of achiral Janus nanoparticles“. Nanoscale 10, Nr. 30 (2018): 14586–93. http://dx.doi.org/10.1039/c8nr05366a.

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18

Eismann, Jörg S., Martin Neugebauer und Peter Banzer. „Exciting a chiral dipole moment in an achiral nanostructure“. Optica 5, Nr. 8 (03.08.2018): 954. http://dx.doi.org/10.1364/optica.5.000954.

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19

Jee, Hongsub, Guanying Chen und Jaehyeong Lee. „Amplification of Chirality in Photopatterned 3D Nanostructures of Chiral/Achiral Mixtures“. Applied Sciences 12, Nr. 17 (30.08.2022): 8702. http://dx.doi.org/10.3390/app12178702.

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The dispersion of a chiral polymer in a polymerizable matrix can amplify the chirality of the material, and a helical conformation of the chiral material within the polymerized SU-8 excessively increased the circular dichroism. Here, we demonstrate the fabrication of three-dimensional nanostructures of chiral/achiral mixtures by two-photon lithography. The irradiation of light and annealing caused local changes in the chiral material and finally led to the enhancement of the optical properties. The demonstration of a photopatternable chiral material could expand the usage of optical materials for various applications.

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20

Sapunova, Anastasiia A., Yulia I. Yandybaeva, Roman A. Zakoldaev, Alexandra V. Afanasjeva, Olga V. Andreeva, Igor A. Gladskikh, Tigran A. Vartanyan und Daler R. Dadadzhanov. „Laser-Induced Chirality of Plasmonic Nanoparticles Embedded in Porous Matrix“. Nanomaterials 13, Nr. 10 (13.05.2023): 1634. http://dx.doi.org/10.3390/nano13101634.

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Chiral plasmonic nanostructures have emerged as promising objects for numerous applications in nanophotonics, optoelectronics, biosensing, chemistry, and pharmacy. Here, we propose a novel method to induce strong chirality in achiral ensembles of gold nanoparticles via irradiation with circularly-polarized light of a picosecond Nd:YAG laser. Embedding of gold nanoparticles into a nanoporous silicate matrix leads to the formation of a racemic mixture of metal nanoparticles of different chirality that is enhanced by highly asymmetric dielectric environment of the nanoporous matrix. Then, illumination with intense circularly-polarized light selectively modifies the particles with the chirality defined by the handedness of the laser light, while their “enantiomers” survive the laser action almost unaffected. This novel modification of the spectral hole burning technique leads to the formation of an ensemble of plasmonic metal nanoparticles that demonstrates circular dichroism up to 100 mdeg. An unforeseen peculiarity of the chiral nanostructures obtained in this way is that 2D and 3D nanostructures contribute almost equally to the observed circular dichroism signals. Thus, the circular dichroism is neither even nor odd under reversal of direction of light propagation. These findings will help guide the development of a passive optical modulator and nanoplatform for enhanced chiral sensing and catalysis.

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21

Zu, Shuai, Tianyang Han, Meiling Jiang, Feng Lin, Xing Zhu und Zheyu Fang. „Deep-Subwavelength Resolving and Manipulating of Hidden Chirality in Achiral Nanostructures“. ACS Nano 12, Nr. 4 (03.04.2018): 3908–16. http://dx.doi.org/10.1021/acsnano.8b01380.

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22

Zuo, Zicheng, Huibiao Liu, Xiaodong Yin, Haiyan Zheng und Yuliang Li. „Controllable growth of one-dimensional chiral nanostructures from an achiral molecule“. Journal of Colloid and Interface Science 329, Nr. 2 (Januar 2009): 390–94. http://dx.doi.org/10.1016/j.jcis.2008.09.037.

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23

Zhang, Yongyuan, Li Wang und Zhongyue Zhang. „Circular Dichroism in Planar Achiral Plasmonic L-Shaped Nanostructure Arrays“. IEEE Photonics Journal 9, Nr. 2 (April 2017): 1–7. http://dx.doi.org/10.1109/jphot.2017.2670783.

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24

Riba-Moliner, Marta, Cristina Oliveras-González, David B. Amabilino und Arántzazu González-Campo. „Supramolecular block copolymers incorporating chiral and achiral chromophores for the bottom-up assembly of nanomaterials“. Journal of Porphyrins and Phthalocyanines 23, Nr. 07n08 (Juli 2019): 916–29. http://dx.doi.org/10.1142/s1088424619500809.

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The coordination of the chiral metalloporphyrin ([5,10,15,20-[4-([Formula: see text]-2-[Formula: see text]-octadecylamidoethyloxiphenyl]porphyrin] zinc (II)) and an achiral homologue to an amphiphilic block copolymer of poly(styrene-[Formula: see text]-4-vinyl pyridine) (PS-[Formula: see text]-P4VP) have been studied in solution and as cast material. The resulting chiral dye-polymer hybrid material has been accomplished via axial coordination between the zinc (II) metal ion in the core of the porphyrin ring and the pyridyl units of the block-copolymer in a non-coordinative solvent. The supramolecular organization and possible chirality transfer to the hybrid material have been studied in solution by UV-visible absorption spectroscopy, fluorescence spectroscopy, Nuclear Magnetic Resonance and Circular Dichroism. The morphology of the chiral and achiral doped polymers has been studied in solid state by Transmission Electron Microscopy and Atomic Force Microscopy. We show that the nanostructures formed depend greatly upon the nature of the side-chains on the porphyrins, where a chiral group leads to a very homogeneous phase-separated material, perhaps indicating that chiral side groups are useful for the preparation of this type of supramolecular hybrid.

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25

Li, Zhiwei, Qingsong Fan, Zuyang Ye, Chaolumen Wu, Zhongxiang Wang und Yadong Yin. „A magnetic assembly approach to chiral superstructures“. Science 380, Nr. 6652 (30.06.2023): 1384–90. http://dx.doi.org/10.1126/science.adg2657.

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Colloidal assembly into chiral superstructures is usually accomplished with templating or lithographic patterning methods that are only applicable to materials with specific compositions and morphologies over narrow size ranges. Here, chiral superstructures can be rapidly formed by magnetically assembling materials of any chemical compositions at all scales, from molecules to nano- and microstructures. We show that a quadrupole field chirality is generated by permanent magnets caused by consistent field rotation in space. Applying the chiral field to magnetic nanoparticles produces long-range chiral superstructures controlled by field strength at the samples and orientation of the magnets. Transferring the chirality to any achiral molecules is enabled by incorporating guest molecules such as metals, polymers, oxides, semiconductors, dyes, and fluorophores into the magnetic nanostructures.

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26

Toffoli, Daniele, Marco Medves, Giovanna Fronzoni, Emanuele Coccia, Mauro Stener, Luca Sementa und Alessandro Fortunelli. „Plasmonic Circular Dichroism in Chiral Gold Nanowire Dimers“. Molecules 27, Nr. 1 (24.12.2021): 93. http://dx.doi.org/10.3390/molecules27010093.

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We report a computational study at the time-dependent density functional theory (TDDFT) level of the chiro-optical spectra of chiral gold nanowires coupled in dimers. Our goal is to explore whether it is possible to overcome destructive interference in single nanowires that damp chiral response in these systems and to achieve intense plasmonic circular dichroism (CD) through a coupling between the nanostructures. We predict a huge enhancement of circular dichroism at the plasmon resonance when two chiral nanowires are intimately coupled in an achiral relative arrangement. Such an effect is even more pronounced when two chiral nanowires are coupled in a chiral relative arrangement. Individual component maps of rotator strength, partial contributions according to the magnetic dipole component, and induced densities allow us to fully rationalize these findings, thus opening the way to the field of plasmonic CD and its rational design.

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27

Le, Khai Q., Shun Hashiyada, Masaharu Kondo und Hiromi Okamoto. „Circularly Polarized Photoluminescence from Achiral Dye Molecules Induced by Plasmonic Two-Dimensional Chiral Nanostructures“. Journal of Physical Chemistry C 122, Nr. 43 (Oktober 2018): 24924–32. http://dx.doi.org/10.1021/acs.jpcc.8b07297.

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28

Hashiyada, Shun, Tetsuya Narushima und Hiromi Okamoto. „Imaging Chirality of Optical Fields near Achiral Metal Nanostructures Excited with Linearly Polarized Light“. ACS Photonics 5, Nr. 4 (25.01.2018): 1486–92. http://dx.doi.org/10.1021/acsphotonics.7b01511.

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29

Oshikiri, Tomoya, Quan Sun, Hiroki Yamada, Shuai Zu, Keiji Sasaki und Hiroaki Misawa. „Extrinsic Chirality by Interference between Two Plasmonic Modes on an Achiral Rectangular Nanostructure“. ACS Nano 15, Nr. 10 (28.09.2021): 16802–10. http://dx.doi.org/10.1021/acsnano.1c07137.

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30

Jiao, Tifeng, Ruirui Xing, Qingrui Zhang, Yaopeng Lv, Jingxin Zhou und Faming Gao. „Self-Assembly, Interfacial Nanostructure, and Supramolecular Chirality of the Langmuir-Blodgett Films of Some Schiff Base Derivatives without Alkyl Chain“. Journal of Nanomaterials 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/297564.

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A special naphthyl-containing Schiff base derivative,N,N′-bis(2-hydroxy-1-naphthylidene)-1,2-phenylenediamine, was synthesized, and its coordination with various metal ions in situ at the air/water interface has been investigated. Although the ligand contains no alkyl chain, it can be spread on water surface. When metal ions existed in the subphase, an interfacial coordination between the ligand and different metal ions occurred in the spreading film, while different Nanostructures were fabricated in the monolayers. Interestingly to note that among various metal ions, only the in situ coordination-induced Cu(II)-complex film showed supramolecular chirality, although the multilayer films from the ligand or preformed complex are achiral. The chirality of the in situ Cu(II)-coordinated Langmuir film was developed due to the special distorted coordination reaction and the spatial limitation at the air/water interface. A possible organization mechanism at the air/water interface was suggested.

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31

Ferry, Vivian. „(Invited, Digital Presentation) Circularly Polarized Photoluminescence from Nanostructured Arrays of Light Emitters“. ECS Meeting Abstracts MA2022-01, Nr. 20 (07.07.2022): 1085. http://dx.doi.org/10.1149/ma2022-01201085mtgabs.

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Metasurfaces offer compact routes to spatial and polarization control of luminescence from nearby emitters. The most common integration strategy is to coat a patterned metamaterial or metasurface with a film of light emitting material. For example, structures such as arrays of Au nanorods coated with achiral light emitters exhibit circularly polarized photoluminescence at specific outcoupled angles. However, the degree of circular polarization in these systems is limited to relatively low values, and does not coincide with the angles with high photoluminescence intensity. This talk will discuss an alternative strategy, where the light emitters are patterned instead. We show that this structure offers several advantages: rather than averaging over the contributions of emitters in many different locations, this system exhibits highly directional photoluminescence with high degrees of circular polarization. Most importantly, the photoluminescence intensity is high at the same angles where the degree of circular polarization is high. These patterned light-emitting nanostructures are formed using direct-write electron beam lithography on semiconductor nanocrystals. This versatile method is capable of forming structures with aspect ratios greater than 2 and feature sizes as small as 30 nm, photoluminescence is retained after patterning, and the system is robust to multiple patterning steps.

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32

Jiang, Quanbo, Aline Pham, Martin Berthel, Serge Huant, Joel Bellessa, Cyriaque Genet und Aurélien Drezet. „Directional and Singular Surface Plasmon Generation in Chiral and Achiral Nanostructures Demonstrated by Leakage Radiation Microscopy“. ACS Photonics 3, Nr. 6 (11.05.2016): 1116–24. http://dx.doi.org/10.1021/acsphotonics.6b00197.

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33

Han, Mina, Sung June Cho, Yasuo Norikane, Masaki Shimizu und Takahiro Seki. „Assembly of an Achiral Chromophore into Light-Responsive Helical Nanostructures in the Absence of Chiral Components“. Chemistry - A European Journal 22, Nr. 12 (02.02.2016): 3971–75. http://dx.doi.org/10.1002/chem.201600227.

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34

Jiang, Kun, Cheng He, Xiao-Ping Liu, Ming-Hui Lu, Bo Cui und Yan-Feng Chen. „Circular-polarization-dependent mode hybridization and slow light in vertically coupled planar chiral and achiral plasmonic nanostructures“. Journal of the Optical Society of America B 32, Nr. 10 (10.09.2015): 2088. http://dx.doi.org/10.1364/josab.32.002088.

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35

Cui, Yinan, Daliao Tao, Xiaoyu Huang, Guolin Lu und Chun Feng. „Self-Assembled Helical and Twisted Nanostructures of a Preferred Handedness from Achiral π-Conjugated Oligo(p-phenylenevinylene) Derivatives“. Langmuir 35, Nr. 8 (02.02.2019): 3134–42. http://dx.doi.org/10.1021/acs.langmuir.8b04127.

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36

Ullah, Hamad, Abuduwaili Abudukelimu, Yu Qu, Yu Bai, Tudahong Aba und Zhongyue Zhang. „Giant circular dichroism of chiral L-shaped nanostructure coupled with achiral nanorod: anomalous behavior of multipolar and dipolar resonant modes“. Nanotechnology 31, Nr. 27 (17.04.2020): 275205. http://dx.doi.org/10.1088/1361-6528/ab84a1.

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37

Yamazaki, Yuta, Yoichi Takanishi und Jun Yamamoto. „Dynamic heterogeneity of a nanostructure in the hyper-swollen B4 phase of achiral bent-core molecules diluted with rod-like liquid crystals“. EPL (Europhysics Letters) 88, Nr. 5 (01.12.2009): 56004. http://dx.doi.org/10.1209/0295-5075/88/56004.

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38

Ishida, Takuya, Akitoshi Isawa, Shuki Kuroki, Yuri Kameoka und Tetsu Tatsuma. „All-plasmonic-metal chiral nanostructures fabricated by circularly polarized light“. Applied Physics Letters 123, Nr. 6 (07.08.2023). http://dx.doi.org/10.1063/5.0155834.

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Chiral plasmonic nanostructures, which would be applied to enantioselective sensors and metasurfaces, can be prepared in an enantioselective manner by irradiation with circularly polarized light (CPL). However, their resonance sites have been covered with non-plasmonic, dielectric moieties. Here, we prepared all-silver chiral plasmonic nanostructures on a glass plate in one-step by irradiating 380–450 nm right- or left-CPL to an aqueous solution containing Ag+ and citrate ions. Achiral or racemic Ag nanoparticles with anisotropic geometry are deposited on a glass plate by photochemical electron transfer from citrate to Ag+ in the initial phase. The deposited nanoparticles are grown into chiral structures under CPL via generation of an electric field with chiral distributions. An achiral Ag nanoplate array was also grown under 600–700 nm CPL into chiral nanostructure arrays on the basis of hot electron reduction of Ag+.

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39

Czajkowski, Krzysztof M., und Tomasz J. Antosiewicz. „Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonators“. Nanophotonics, 12.08.2022. http://dx.doi.org/10.1515/nanoph-2022-0293.

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Abstract Large optical chirality in the vicinity of achiral high-index dielectric nanostructures has been recently demonstrated as useful means of enhancing molecular circular dichroism. We theoretically study the spatial dependence of optical chirality enhancement in the vicinity of high-index dielectric nanodisks and highlight its importance for the design of nanophotonic platforms for circular dichroism enhancement. Using a T-matrix framework, we demonstrate that, depending on the disk aspect ratio, chirality is enhanced preferentially along different directions. We employ various statistical procedures, including surface, volume and orientation averaging, to predict enhancement of chiroptical effects and show that optimal properties of a nanostructure depend substantially on whether spatial maximum or average chirality enhancement is sought after. The results indicate that at times it is beneficial to sacrifice helicity preservation for a larger field enhancement. Similarly, the optimal choice of the nanostructure is influenced by presence of a substrate, which limits the space available to be occupied by analyte molecules and impacts the optical chirality in the vicinity of the nanostructure.

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40

Li, Hongxu, Ying Cui, Min Tao, Shuo Sun, Xinyao Yan und Yin Xiao. „Discriminatory fluorescence and FRET in the chiral-perovskite/RhB system“. Physical Chemistry Chemical Physics, 2024. http://dx.doi.org/10.1039/d3cp05277j.

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41

Yao, Jun, Yihua Bai, Yi-Dong Liu, Jian Wang und Yuanjie Yang. „Sorting of enantiomers using optical chirality in uniform light field“. Applied Physics Letters 124, Nr. 19 (06.05.2024). http://dx.doi.org/10.1063/5.0203912.

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Enantiomer sorting greatly promotes the advancement of chemistry, bioscience, and medicine while also facing significant challenges. Recently, all-optical solutions have attracted considerable interest due to their non-invasiveness. While, it should be noted that the achiral optical force is always much larger than the chiral gradient force that plays a key role in all-optical enantiomer sorting, hindering the separation of enantiomers. Previously proposed methods to boost the chiral gradient forces by plasmonic and photonic nanostructures are often accompanied by the enhancement of achiral optical forces. The sorted chiral particles are also difficult to be transferred from the complex nanostructures. Here, we propose an approach for separating enantiomers using uniform light field formed by two waves, which is capable of sorting deep sub-wavelength chiral particles. In our method, the chiral particles can be sorted within a simple planar structure while the achiral gradient force is equal to zero. Our research reveals a promising perspective on large-scale sorting for enantiomers.

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42

Zong, Yufen, Chunmei Zhang und Hai Cao. „Chiral functionalization of solid surfaces with amino acid derivatives: diazonium grafting regulated by enantioselective processes“. Dalton Transactions, 2022. http://dx.doi.org/10.1039/d2dt02418g.

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Chiral inorganic nanostructures are essential for many enantioselective processes. It is possible to bestow chirality to otherwise achiral inorganic materials, via covalent functionalization of their surfaces with chiral organic molecules....

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43

Wang, Yongkai, Zhiduo Li, Qianying Wang, Zhiyu Zhang, Xiang Lan, Qingyan Han, Lipeng Zhu, Chengyun Zhang, Xiaolong Zhao und Jun Dong. „Induced circular dichroism of achiral dielectric elliptical hole with monolayer borophene film“. Physical Chemistry Chemical Physics, 2022. http://dx.doi.org/10.1039/d2cp04072g.

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Induced circular dichroism (ICD) is widely used in miniature polarizers, molecular detection, and negative refractive index media. However, enhancing and dynamic regulation of ICD signals of achiral nanostructures in the...

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44

Lee, Seunghoon, Chenghao Fan, Artur Movsesyan, Johannes Bürger, Fedja J. Wendisch, Leonardo de S. Menezes, Stefan A. Maier et al. „Unraveling the Chirality Transfer from Circularly Polarized Light to Single Plasmonic Nanoparticles“. Angewandte Chemie International Edition, 18.01.2024. http://dx.doi.org/10.1002/anie.202319920.

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Due to their broken symmetry, chiral plasmonic nanostructures have unique optical properties and multiple applications. However, there is still a lack of comprehension about how chirality transfer between circularly polarized light (CPL) and these structures occurs. Here, we thoroughly investigate the plasmon‐assisted growth of chiral nanoparticles from achiral Au nanocubes (AuNCs) via CPL without the involvement of any chiral molecule stimulators. We identify the structural chirality of our synthesized chiral plasmonic nanostructures by using circular differential scattering (CDS) spectroscopy correlated with scanning electron microscopy imaging at both the single‐particle and ensemble levels. Theoretical simulations, including hot‐electron surface maps, reveal that the plasmon‐induced chirality transfer is mediated by the asymmetric distribution of hot electrons on achiral AuNCs under CPL excitation. Furthermore, we shed light on how this plasmon‐induced chirality transfer can also be utilized for chiral growth in bimetallic systems, such as Ag or Pd on AuNCs. Results presented here reveal fundamental aspects of chiral light‐matter interaction, influencing the future design and optimization of chiral sensors and chiral catalysis, among others.

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Lee, Seunghoon, Chenghao Fan, Artur Movsesyan, Johannes Bürger, Fedja J. Wendisch, Leonardo de S. Menezes, Stefan A. Maier et al. „Unraveling the Chirality Transfer from Circularly Polarized Light to Single Plasmonic Nanoparticles“. Angewandte Chemie, 18.01.2024. http://dx.doi.org/10.1002/ange.202319920.

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Due to their broken symmetry, chiral plasmonic nanostructures have unique optical properties and multiple applications. However, there is still a lack of comprehension about how chirality transfer between circularly polarized light (CPL) and these structures occurs. Here, we thoroughly investigate the plasmon‐assisted growth of chiral nanoparticles from achiral Au nanocubes (AuNCs) via CPL without the involvement of any chiral molecule stimulators. We identify the structural chirality of our synthesized chiral plasmonic nanostructures by using circular differential scattering (CDS) spectroscopy correlated with scanning electron microscopy imaging at both the single‐particle and ensemble levels. Theoretical simulations, including hot‐electron surface maps, reveal that the plasmon‐induced chirality transfer is mediated by the asymmetric distribution of hot electrons on achiral AuNCs under CPL excitation. Furthermore, we shed light on how this plasmon‐induced chirality transfer can also be utilized for chiral growth in bimetallic systems, such as Ag or Pd on AuNCs. Results presented here reveal fundamental aspects of chiral light‐matter interaction, influencing the future design and optimization of chiral sensors and chiral catalysis, among others.

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46

Stamatopoulou, Elli, Sotiris Droulias, Guillermo Acuna, N. Asger Mortensen und Christos Tserkezis. „Reconfigurable chirality with achiral excitonic materials in the strong-coupling regime“. Nanoscale, 2022. http://dx.doi.org/10.1039/d2nr05063c.

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We introduce and theoretically analyze the concept of manipulating optical chirality via strong coupling of the optical modes of chiral nanostructures with excitonic transitions in molecular layers or semiconductors. With...

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47

Miao, Tengfei, Xiaoxiao Cheng, Gong Zhang, Yuqing Wang, Zixiang He, Zhao Wang und Wei Zhang. „Self-recovery of Chiral Microphase Separation in Achiral Diblock Copolymer System“. Chemical Science, 2023. http://dx.doi.org/10.1039/d2sc05975d.

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Macroscopic regulation of chiral supramolecular nanostructures in liquid-crystalline block copolymers is of great significance in photonics and nanotechnology. Although fabricating helical phase structures via chiral doping and microphase separation has...

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48

Wen, Xin, Fulin Wang, Sifan Du, Yuqian Jiang, Li Zhang und Minghua Liu. „Achiral Solvent Inversed Helical Pathway and Cosolvent Controlled Excited‐State “Majority Rule” in Enantiomeric Dansulfonamide Assemblies“. Small, 11.05.2024. http://dx.doi.org/10.1002/smll.202401954.

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AbstractAchiral solvents are commonly utilized to induce the self‐assembly of chiral molecules. This study demonstrates that achiral solvents can trigger helicity inversion in the assemblies of dansyl amphiphiles and control the excited‐state “majority rule” in assemblies composed of pure enantiomers, through variation of the cosolvent ratio. Specifically, enantiomers of dansyl amphiphiles self‐assemble into helical structures with opposite handedness in methanol (MeOH) and acetonitrile (MeCN), together with inversed circular dichroism and circularly polarized luminescence (CPL) signals. When a mixture of MeOH and MeCN is employed, the achiral cosolvents collectively affect the CPL of the assemblies in a way similar to that of “mixed enantiomers”. The dominant cosolvent governs the CPL signal. As the cosolvent composition shifts from pure MeCN to MeOH, the CPL signals undergo a significant inversion and amplification, with two maxima observed at ≈20% MeOH and 20% MeCN. This study deepens the comprehension of how achiral solvents modulate helical nanostructures and their excited‐state chiroptical properties.

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Kuznetsova, Vera, Áine Coogan, Dmitry Botov, Yulia Gromova, Elena V. Ushakova und Yurii K. Gun'ko. „Expanding the Horizons of Machine Learning in Nanomaterials to Chiral Nanostructures“. Advanced Materials, 19.01.2024. http://dx.doi.org/10.1002/adma.202308912.

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AbstractMachine learning holds significant research potential in the field of nanotechnology, enabling nanomaterial structure and property predictions, facilitating the design of novel materials, and reducing the need for time‐consuming and labour‐intensive experiments and simulations. In contrast to their achiral counterparts, the application of machine learning for chiral nanomaterials and nanostructures is still in its infancy, with a limited number of publications to date. This is despite the great potential of machine learning to advance the development of new sustainable chiral materials with high values of optical activity, circularly polarised luminescence, and enantioselectivity, as well as for the analysis of structural chirality by electron microscopy. In this review, we provide an analysis of machine learning methods used in studying achiral nanomaterials, subsequently offering guidance on adapting and extending this work to chiral nanomaterials. We present an overview of chiral nanomaterials within the framework of synthesis‐structure‐property‐application relationships and provide insights on how to leverage machine learning for the study of these highly complex relationships. We also review and discuss some key recent publications on the application of machine learning for chiral nanomaterials. Finally, the review captures the key achievements, ongoing challenges, and the prospective outlook for this very important research field.This article is protected by copyright. All rights reserved

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Liu, Minghua. „Chiral Polyaniline Nanostructures: Achiral Fabrication and Application for Enantioselective Separation“. Acta Physico-Chimica Sinica, 2020, 2004031–0. http://dx.doi.org/10.3866/pku.whxb202004031.

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