Journal ArticleDOI
Self-Assembly of Chiral Nanoparticle Pyramids with Strong R/S Optical Activity
TLDR
Preparation of a family of self-assembled chiral pyramids made from multiple metal and/or semiconductor NPs with a yield as high as 80% and Tunability of chiroptical bands related to these transitions is essential from fundamental and practical points of view.Abstract:
Chirality at the nanometer scale represents one of the most rapidly developing areas of research. Self-assembly of DNA–nanoparticle (NP) hybrids enables geometrically precise assembly of chiral isomers. The concept of a discrete chiral nanostructure of tetrahedral shape and topology fabricated from four different NPs located in the corners of the pyramid is fundamental to the field. While the first observations of optical activity of mixed pyramidal assemblies were made in 2009 (Chen, W.; Nano Lett. 2009, 9, 2153−2159), further studies are difficult without finely resolved optical data for precisely organized NP pyramidal enantiomers. Here we describe the preparation of a family of self-assembled chiral pyramids made from multiple metal and/or semiconductor NPs with a yield as high as 80%. Purposefully made R- and S-enantiomers of chiral pyramids with four different NPs from three different materials displayed strong chiroptical activity, with anisotropy g-factors as high as 1.9 × 10–2 in the visible spec...read more
Citations
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Journal ArticleDOI
SERS Nanoparticles in Medicine: From Label-Free Detection to Spectroscopic Tagging.
TL;DR: Spectroscopic Tagging helps clarify the role of X-ray diffraction in the determination of Higgs boson levels in the response of EMTs to injury.
Journal ArticleDOI
Amino-acid- and peptide-directed synthesis of chiral plasmonic gold nanoparticles
Hye-Eun Lee,Hyo-Yong Ahn,Jungho Mun,Yoon Young Lee,Minkyung Kim,Nam Heon Cho,Kiseok Chang,Wook Sung Kim,Wook Sung Kim,Junsuk Rho,Ki Tae Nam +10 more
TL;DR: A strategy for synthesizing chiral gold nanoparticles that involves using amino acids and peptides to control the optical activity, handedness and chiral plasmonic resonance of the nanoparticles is developed and it is anticipated that this strategy will aid in the rational design and fabrication of three-dimensional chiral nanostructures for use in plAsmonic metamaterial applications.
Journal ArticleDOI
Chiral Inorganic Nanostructures
TL;DR: This review will cover both experiment and theory of chiral nanostructures starting with the origin and multiple components of mirror asymmetry of individual NPs and their assemblies, and shall consider four different types of chirality in nanostructure and related physical, chemical, and biological effects.
Journal ArticleDOI
Attomolar DNA detection with chiral nanorod assemblies
TL;DR: It is demonstrated that gold nanorods assembled by the polymerase chain reaction into DNA-bridged chiral systems have promising analytical applications and may be particularly useful for biological analytes larger than 2–5 nm which are difficult to detect by methods based on plasmon coupling and ‘hot spots’.
Journal ArticleDOI
Hierarchical assembly of metal nanoparticles, quantum dots and organic dyes using DNA origami scaffolds
Robert D. Schreiber,Jaekwon Do,Eva-Maria Roller,Tao Zhang,Verena Schüller,Philipp C. Nickels,Jochen Feldmann,Tim Liedl +7 more
TL;DR: R rigid DNA origami scaffolds can be used to assemble metal nanoparticles, quantum dots and organic dyes into hierarchical nanoclusters that have a planet-satellite-type structure and can be positioned along the radial DNA spacers of the nanostructures.
References
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Journal ArticleDOI
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Journal ArticleDOI
Organization of 'nanocrystal molecules' using DNA
A. Paul Alivisatos,A. Paul Alivisatos,Kai Johnsson,Xiaogang Peng,Xiaogang Peng,Troy E. Wilson,Colin J. Loweth,Marcel P. Bruchez,Marcel P. Bruchez,Peter G. Schultz +9 more
TL;DR: A strategy for the synthesis of 'nanocrystal molecules', in which discrete numbers of gold nanocrystals are organized into spatially defined structures based on Watson-Crick base-pairing interactions is described.
Journal ArticleDOI
DNA-based self-assembly of chiral plasmonic nanostructures with tailored optical response
Anton Kuzyk,Robert D. Schreiber,Zhiyuan Fan,Günther Pardatscher,Eva-Maria Roller,Alexander Högele,Friedrich C. Simmel,Alexander O. Govorov,Tim Liedl +8 more
TL;DR: It is shown that DNA origami enables the high-yield production of plasmonic structures that contain nanoparticles arranged in nanometre-scale helices, and it is found that the structures in solution exhibit defined circular dichroism and optical rotatory dispersion effects at visible wavelengths that originate from the collective plAsmon–plasmon interactions of the nanoparticles positioned with an accuracy better than two nanometres.
Journal ArticleDOI
A Chiral Route to Negative Refraction
TL;DR: The introduction of a single chiral resonance leads to negative refraction of one polarization, resulting in improved and simplified designs of negatively refracting materials and opening previously unknown avenues of investigation in this fast-growing subject.
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