Chiral Transformation: From Single Nanowire to Double Helix

Wang, Yong; Wang, Qingxiao; Sun, Hang; Zhang, Weiqing; Chen, Gang; Wang, Yawen; Shen, Xiaoshuang; Han, Yu; Lu, Xianmao; Chen, Hongyu

doi:10.1021/ja208121c

Cited by 103 publications

(144 citation statements)

References 31 publications

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“…These nanocomposites were treated with 23.5 mM AgNO 3 at 50°C for 2 h. After centrifugation to remove the excess AgNO 3 , the product was redispersed in 34 mM sodium citrate in DMF, and the mixture was incubated at 90°C for 2 h to reduce the adsorbed Ag þ ions. Here, DMF was used to slow down the reduction reaction, 8 in order to favor uniform deposition of Ag. Finally, the product was isolated by centrifugation and characterized.…”

Section: Articlementioning

confidence: 99%

Induced Coiling Action: Exploring the Intrinsic Defects in Five-Fold Twinned Silver Nanowires

et al. 2012

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Growth of polythiophene (PTh) on five-fold twinned Ag nanowires (NWs) is not symmetrical due to preferred etching of their intrinsic defects. This imbalance of polymer formation leads to consistent bending action along the etched NWs, coiling the resulting Ag-PTh nanocomposites into planar spirals. We studied the etching intermediates and also the effects of the surface ligands in order to understand the symmetry-breaking action. The defect-dependent etching chemistry offers a new means to induce motion and a novel perspective in the ordered occurrence of certain defects. We demonstrate that Ag can be deposited back onto the coiled Ag-PTh composite to form metallic spirals.

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Section: Articlementioning

confidence: 99%

Induced Coiling Action: Exploring the Intrinsic Defects in Five-Fold Twinned Silver Nanowires

et al. 2012

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“…Constructing a helix within inorganic nanomaterials can potentially generate some unique properties that may be beneficial for their utilization beyond the traditional fields 7,8. During the past few years, considerable attention has focused on the design of supramolecular self-assembled helices based on noncovalent interactions 9–14. However, there are only a few cases of helical metallic nanocrystals in the literature due to the intrinsic lattice symmetry of the atomic packing modes.…”

Section: Introductionmentioning

confidence: 99%

Pt nanohelices with highly ordered horizontal pore channels as enhanced photothermal materials

Song

Wang

et al. 2015

Chem. Sci.

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“…24,25 However, aside from these discoveries, more sophisticated chiral structures with defined geometry and enhanced optical activities are still needed, as new insights into the controllable creation of nanostructural chirality should be brought and applications of chiral structures continue to be expanded. 26,27 Three-dimensional (3D) chiral superstructures that have precise 3D ordering of nanomaterials and intentionally introduced asymmetry can display far more morphological and structural complexity, and even advanced functionalities. By organizing anisotropic nanocrystals such as AuNRs into 3D asymmetric superstructures, enhanced chirality may be produced as compared to those of isotropic NP superstructures, benefiting from the high dissymmetry factor and the strong plasmon antenna effect of the building blocks.…”

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confidence: 99%

Au Nanorod Helical Superstructures with Designed Chirality

et al. 2014

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A great challenge for nanotechnology is to controllably organize anisotropic nanomaterials into well-defined three-dimensional superstructures with customized properties. Here we successfully constructed anisotropic Au nanorod (AuNR) helical superstructures (helices) with tailored chirality in a programmable manner. By designing the 'X' pattern of the arrangement of DNA capturing strands (15nt) on both sides of a two-dimensional DNA origami template, AuNRs functionalized with the complementary DNA sequences were positioned on the origami and were assembled into AuNR helices with the origami intercalated between neighboring AuNRs. Left-handed (LH) and right-handed (RH) AuNR helices were conveniently accomplished by solely tuning the mirrored-symmetric 'X' patterns of capturing strands on the origami. The inter-rod distance was precisely defined as 14 nm and inter-rod angle as 45°, thus a full helix contains 9 AuNRs with its length up to about 220 nm. By changing the AuNR/origami molar ratio in the assembly system, the average number of AuNR in the helices was tuned from 2 to 4 and 9. Intense chiroptical activities arose from the longest AuNR helices with a maximum anisotropy factor of ∼0.02, which is highly comparable to the reported macroscopic AuNR assemblies. We expect that our strategy of origami templated assembly of anisotropic chiral superstructures would inspire the bottom-up fabrication of optically active nanostructures and shed light on a variety of applications, such as chiral fluids, chiral signal amplification, and fluorescence combined chiral spectroscopy.

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Chiral Transformation: From Single Nanowire to Double Helix

Cited by 103 publications

References 31 publications

Induced Coiling Action: Exploring the Intrinsic Defects in Five-Fold Twinned Silver Nanowires

Induced Coiling Action: Exploring the Intrinsic Defects in Five-Fold Twinned Silver Nanowires

Pt nanohelices with highly ordered horizontal pore channels as enhanced photothermal materials

Au Nanorod Helical Superstructures with Designed Chirality

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