Strong Chiroptical Activities in Gold Nanorod Dimers Assembled Using DNA Origami Templates

Chen, Zhong; Lan, Xiang; Chiu, Yu-Che; Lu, Xuxing; Ni, Weihai; Gao, Hanwei; Wang, Qiangbin

doi:10.1021/ph500434f

Cited by 65 publications

(68 citation statements)

References 34 publications

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“…Accordingly, there has been significant efforts in the fabrication of synthetic chiral substrates with large chiro-optical activity in the visible region, which are promising candidates for device applications such as broadband circular polarizers, 5,6 sensors for chiral detection, 7 and negative indices of refraction. As an alternate strategy, decorating metallic NPs onto a dielectric templates of chiral geometries, such as DNA, 16,17 oligomers, 18 nanocomposite polymer fibers, 19 polypeptide tubes, 20 have been quite promising and most often allow larger throughput. Earlier reports mainly focused on making metallic chiral geometries such as gammadions 12,13 and split-ring geometry, 14,15 which typically involved the use of lithographic fabrication steps, and therefore required increased process duration and use of clean rooms.…”

Section: Introductionmentioning

confidence: 99%

Tuning the chiro-plasmonic response using high refractive index-dielectric templates

2015

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Chiral metamaterials have recently gained attention due to their applicability in developing polarization devices and in the detection of chiral molecules. A common approach towards fabricating plasmonic chiral nanostructures has been decorating metallic nanoparticles on dielectric chiral scaffolds, such as a helix. This resulted in the generation of a large chiro-optical response over a wide range of the electromagnetic spectrum. It has been shown previously that the optical tunability of these chiral metamaterials depends on the geometrical aspects of the overall structure, as well as the nature of the plasmonic constituents. In this study, we have investigated the role of the underlying dielectric scaffold with numerical simulations, and experimentally demonstrated that it is possible to enhance and engineer their chiro-plasmonic response significantly by choosing dielectric scaffolds of appropriate materials.

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Section: Introductionmentioning

confidence: 99%

Tuning the chiro-plasmonic response using high refractive index-dielectric templates

2015

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“…This was due to the slight angle perturbations between AuNRs templated on a pseudo‐plane DNA origami structure. A later study further verified that this non‐negligible perturbation leads to chiral responses of end‐to‐end oriented AuNR dimers located on the same side of the DNA origami structure …”

Section: Self‐assembly Of Chiral Plasmonic Nanostructuresmentioning

confidence: 76%

Self‐Assembly of Chiral Plasmonic Nanostructures

2016

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Plasmonic chiroptical effects have attracted significant attention for their widespread potential applications in negative-refractive-index materials, advanced light-polarization filters, and ultrasensitive sensing devices, etc. As compared to top-down fabrication methods, the bottom-up self-assembly strategy provides nanoscale resolution, parallel production, and isotropic optical response, and therefore plays an indispensable role in the fabrication of chiral plasmonic nanostructures. The optical properties of these chiral structures can be predicted based on the near-field coupling of localized surface plasmons in structural components, which offers a route to tune or enhance optical activity by selecting building blocks and designing structural configurations. To date, three main types of chiral plasmonic nanostructures, i.e., chiral "plasmonic molecules", chiral superstructures, and chiral-molecule-metal hybrid complexes, are usually assembled, in which metal nanoparticles with various sizes, shapes, and compositions, and/or chiral molecules are employed as building blocks. Here, recent achievements in the self-assembly of chiral plasmonic nanostructures are highlighted and perspectives on the future directions of chiral plasmonics integrated with bottom-up self-assembly are presented, showing three typical examples, including chiral plasmonic switches, chiral nanoparticles, and chiral metamaterials.

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“…Figure S3 (Supporting Information) shows TEM Adv. [35] In contrast, the corresponding LH and RH helical superstructures displayed dramatical CD responses with notable characteristic bisignate spectra. 2017, 29, 1606533 www.advancedsciencenews.com www.advmat.de images of the bifacial structures consisting of different-sized AuNPs.…”

Section: Spiral Patterning Of Au Nanoparticles On Au Nanorod Surface mentioning

confidence: 99%

Spiral Patterning of Au Nanoparticles on Au Nanorod Surface to Form Chiral AuNR@AuNP Helical Superstructures Templated by DNA Origami

et al. 2017

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Plasmonic motifs with precise surface recognition sites are crucial for assembling defined nanostructures with novel functionalities and properties. In this work, a unique and effective strategy is successfully developed to pattern DNA recognition sites in a helical arrangement around a gold nanorod (AuNR), and a new set of heterogeneous AuNR@AuNP plasmonic helices is fabricated by attaching complementary-DNA-modified gold nanoparticles (AuNPs) to the predesigned sites on the AuNR surface. AuNR is first assembled to one side of a bifacial rectangular DNA origami, where eight groups of capture strands are selectively patterned on the other side. The subsequently added link strands make the rectangular DNA origami roll up around the AuNR into a tubular shape, therefore giving birth to a chiral patterning of DNA recognition sites on the surface of AuNR. Following the hybridization with the AuNPs capped with the complementary strands to the capture strands on the DNA origami, left-handed and right-handed AuNR@AuNP helical superstructures are precisely formed by tuning the pattern of the recognition sites on the AuNR surface. Our strategy of nanoparticle surface patterning innovatively realizes hierarchical self-assembly of plasmonic superstructures with tunable chiroptical responses, and will certainly broaden the horizon of bottom-up construction of other functional nanoarchitectures with growing complexity.

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Strong Chiroptical Activities in Gold Nanorod Dimers Assembled Using DNA Origami Templates

Cited by 65 publications

References 34 publications

Tuning the chiro-plasmonic response using high refractive index-dielectric templates

Tuning the chiro-plasmonic response using high refractive index-dielectric templates

Self‐Assembly of Chiral Plasmonic Nanostructures

Spiral Patterning of Au Nanoparticles on Au Nanorod Surface to Form Chiral AuNR@AuNP Helical Superstructures Templated by DNA Origami

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