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    Home > Construction of gold nanorods @ Gold Nanoparticle chiral helix super structure by DNA origami

    Construction of gold nanorods @ Gold Nanoparticle chiral helix super structure by DNA origami

    • Last Update: 2017-06-15
    • Source: Internet
    • Author: User
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    Plasma nanoparticles and their assembly structures are widely used in nanotechnology due to their excellent optical properties, such as metamaterials, biosensors, photoelectric devices, etc It is of great significance to construct plasma nanostructures precisely for the in-depth study of optical properties, and the key to further obtain complex self-assembly system is to precisely control the surface functional properties of plasma nanoparticles At present, with the help of various physical and chemical methods, functional selective regulation can be realized in a certain area of the surface of nanoparticles However, it is still a great challenge to obtain accurate patterning methods of functional sites on the surface of nanoparticles DNA nanotechnology, represented by DNA origami, has a strong ability of addressing spatial sites, and can realize the precise layout of functional sites in space Combined with nanoparticles, it can realize the accurate patterning of functional sites on the surface of nanoparticles If the surface pattern is further rationally designed as asymmetric geometry with chirality, the multi-level assembly of complex chiral nanostructures can be guided by this basic construction unit Wang qiangbin, researcher of Suzhou Institute of nanotechnology and nano bionics, Chinese Academy of Sciences, has been committed to building a complex nano self-assembly system with the help of DNA nanotechnology Recently, they used DNA origami to obtain a series of gold nanorods @ Gold Nanoparticles chiral helical super structures for the first time Firstly, 60 × 90 nm two-dimensional rectangular DNA origami was used as the template Through the rational design of the surface functional sites of DNA origami, the rectangular DNA origami was curled on the surface of a 13 × 38 nm gold nanorod to form a cylinder structure after the multi-step DNA hybridization reaction Eight groups of pre-designed capture strand DNA on DNA origami then formed a left-handed or right-handed spiral recognition site on the surface of gold nanorods Furthermore, eight DNA sequences with complementary surface modification and DNA origami surface capture chain were introduced Through complementary pairing, eight gold nanoparticles were precisely assembled on the surface of each gold nanorod to form the left-handed and right-handed helical gold nanorod @ Gold Nanoparticle super structures In view of the asymmetric geometry of this complex assembly system, significant chiral optical response has been observed These chiral signals originate from the local surface plasmon resonance (LSPR) coupling between the gold nanorods in the center of the structure and the helix of the surrounding gold nanoparticles By adjusting the size of nanoparticles in the helix structure, the intensity of the chiral spectrum of gold nanorods @ gold nanoparticles can be effectively modulated This strategy provides a new idea for building complex functional nano self-assembly system from bottom to top Paper link: onlinelibrary.wiley.com/doi/10.1002/adma.201606533/abstract
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