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Nanoscale building blocks and DNA 'glue' help shape 3D architectures

Date:
August 11, 2015
Source:
Department of Energy, Office of Science
Summary:
Scientists devised a new way of assembling ordered crystals made of nanoparticles. In this process, nanoparticles in the shape of cubes, octahedrons, and spheres coordinate with each other to build structures. The shapes are bound together by complementary DNA molecules on each type of particle.
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a) Schematic of shape-induced directional bonds for DNA-linked nanoparticle assembly. b) Formation of large-scale 3D binary crystals with predictable lattice symmetry, as determined by the cubic geometry and DNA-encoded interactions between cubes and spheres (scale bar: 500nm)
Credit: Image courtesy of Center for Functional Nanomaterials, BNL

Scientists developed a novel way of assembling ordered crystals composed of nanoparticles. In this process, nanoparticles in the shape of cubes, octahedrons, and spheres coordinate with each other to build structures. The shapes are bound together by complementary DNA molecules on each type of nanoparticle. The structures of the resulting three-dimensional crystals are determined by the spatial symmetry of the facets of the cubes and octahedrons, while their structural order depends on DNA-tuned interactions and the ratio of the nanoparticles' sizes.

Directional binding for self-assembling materials made of different types of nanoparticles opens up opportunities to design unique materials that could benefit high-density energy storage devices and catalysis, among other applications.

The organization of spherical particles into lattices is typically driven by packing considerations. Although the addition of directional binding can significantly broaden structural diversity, nanoscale implementation remains challenging. Recent investigations by staff scientists in the Soft and Bio Nanomaterials Group at the Center for Functional Nanomaterials at Brookhaven National Laboratory explored the assembly of clusters and lattices in which anisotropic polyhedral blocks coordinate isotropic spherical nanoparticles via shape-induced directional interactions facilitated by DNA recognition. The scientists have shown that the polyhedral blocks -- cubes and octahedrons -- when mixed with spheres, promote the assembly of clusters with an architecture determined by polyhedron symmetry.

Moreover, three-dimensional binary superlattices are formed when DNA shells accommodate the shape disparity between nanoparticle interfaces, the architecture of which was captured using scanning electron microscopy in CFN's Materials Synthesis and Characterization Facility. The crystallographic symmetry of assembled lattices is determined by the spatial symmetry of the block's facets, which was characterized using CFN's Advanced Ultraviolet and X-ray Probes Facility (specifically, NSLS/CFN endstation X9 beamline). Meanwhile structural order depends on both DNA-tuned interactions and the hetero-particle size ratio.

This novel method, which exploits shape for defining the global structure and DNA-mediation locally, opens up new possibilities for the by-design fabrication of binary superlattices.

Research was carried out at the Center for Functional Nanomaterials and National Synchrotron Light Source, Brookhaven National Laboratory, which are supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract no. DE-AC02-98CH10886.


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Materials provided by Department of Energy, Office of Science. Note: Content may be edited for style and length.


Journal Reference:

  1. Fang Lu, Kevin G. Yager, Yugang Zhang, Huolin Xin, Oleg Gang. Superlattices assembled through shape-induced directional binding. Nature Communications, 2015; 6: 6912 DOI: 10.1038/ncomms7912

Cite This Page:

Department of Energy, Office of Science. "Nanoscale building blocks and DNA 'glue' help shape 3D architectures." ScienceDaily. ScienceDaily, 11 August 2015. <www.sciencedaily.com/releases/2015/08/150811160429.htm>.
Department of Energy, Office of Science. (2015, August 11). Nanoscale building blocks and DNA 'glue' help shape 3D architectures. ScienceDaily. Retrieved May 24, 2017 from www.sciencedaily.com/releases/2015/08/150811160429.htm
Department of Energy, Office of Science. "Nanoscale building blocks and DNA 'glue' help shape 3D architectures." ScienceDaily. www.sciencedaily.com/releases/2015/08/150811160429.htm (accessed May 24, 2017).

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