Colloidal diamond

Self-assembling colloidal particles in the cubic diamond crystal structure could potentially be used to make materials with a photonic bandgap 1 – 3 . Such materials are beneficial because they suppress spontaneous emission of light 1 and are valued for their applications as optical waveguides, filt...

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Veröffentlicht in:Nature (London) 2020-09, Vol.585 (7826), p.524-529
Hauptverfasser: He, Mingxin, Gales, Johnathon P., Ducrot, Étienne, Gong, Zhe, Yi, Gi-Ra, Sacanna, Stefano, Pine, David J.
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container_issue 7826
container_start_page 524
container_title Nature (London)
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creator He, Mingxin
Gales, Johnathon P.
Ducrot, Étienne
Gong, Zhe
Yi, Gi-Ra
Sacanna, Stefano
Pine, David J.
description Self-assembling colloidal particles in the cubic diamond crystal structure could potentially be used to make materials with a photonic bandgap 1 – 3 . Such materials are beneficial because they suppress spontaneous emission of light 1 and are valued for their applications as optical waveguides, filters and laser resonators 4 , for improving light-harvesting technologies 5 – 7 and for other applications 4 , 8 . Cubic diamond is preferred for these applications over more easily self-assembled structures, such as face-centred-cubic structures 9 , 10 , because diamond has a much wider bandgap and is less sensitive to imperfections 11 , 12 . In addition, the bandgap in diamond crystals appears at a refractive index contrast of about 2, which means that a photonic bandgap could be achieved using known materials at optical frequencies; this does not seem to be possible for face-centred-cubic crystals 3 , 13 . However, self-assembly of colloidal diamond is challenging. Because particles in a diamond lattice are tetrahedrally coordinated, one approach has been to self-assemble spherical particles with tetrahedral sticky patches 14 – 16 . But this approach lacks a mechanism to ensure that the patchy spheres select the staggered orientation of tetrahedral bonds on nearest-neighbour particles, which is required for cubic diamond 15 , 17 . Here we show that by using partially compressed tetrahedral clusters with retracted sticky patches, colloidal cubic diamond can be self-assembled using patch–patch adhesion in combination with a steric interlock mechanism that selects the required staggered bond orientation. Photonic bandstructure calculations reveal that the resulting lattices (direct and inverse) have promising optical properties, including a wide and complete photonic bandgap. The colloidal particles in the self-assembled cubic diamond structure are highly constrained and mechanically stable, which makes it possible to dry the suspension and retain the diamond structure. This makes these structures suitable templates for forming high-dielectric-contrast photonic crystals with cubic diamond symmetry. Self-assembly of cubic diamond crystals is demonstrated, by using precursor clusters of particles with carefully placed ‘sticky’ patches that attract and bind adjacent clusters in specific geometries.
doi_str_mv 10.1038/s41586-020-2718-6
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But this approach lacks a mechanism to ensure that the patchy spheres select the staggered orientation of tetrahedral bonds on nearest-neighbour particles, which is required for cubic diamond 15 , 17 . Here we show that by using partially compressed tetrahedral clusters with retracted sticky patches, colloidal cubic diamond can be self-assembled using patch–patch adhesion in combination with a steric interlock mechanism that selects the required staggered bond orientation. Photonic bandstructure calculations reveal that the resulting lattices (direct and inverse) have promising optical properties, including a wide and complete photonic bandgap. The colloidal particles in the self-assembled cubic diamond structure are highly constrained and mechanically stable, which makes it possible to dry the suspension and retain the diamond structure. This makes these structures suitable templates for forming high-dielectric-contrast photonic crystals with cubic diamond symmetry. 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Such materials are beneficial because they suppress spontaneous emission of light 1 and are valued for their applications as optical waveguides, filters and laser resonators 4 , for improving light-harvesting technologies 5 – 7 and for other applications 4 , 8 . Cubic diamond is preferred for these applications over more easily self-assembled structures, such as face-centred-cubic structures 9 , 10 , because diamond has a much wider bandgap and is less sensitive to imperfections 11 , 12 . In addition, the bandgap in diamond crystals appears at a refractive index contrast of about 2, which means that a photonic bandgap could be achieved using known materials at optical frequencies; this does not seem to be possible for face-centred-cubic crystals 3 , 13 . However, self-assembly of colloidal diamond is challenging. Because particles in a diamond lattice are tetrahedrally coordinated, one approach has been to self-assemble spherical particles with tetrahedral sticky patches 14 – 16 . But this approach lacks a mechanism to ensure that the patchy spheres select the staggered orientation of tetrahedral bonds on nearest-neighbour particles, which is required for cubic diamond 15 , 17 . Here we show that by using partially compressed tetrahedral clusters with retracted sticky patches, colloidal cubic diamond can be self-assembled using patch–patch adhesion in combination with a steric interlock mechanism that selects the required staggered bond orientation. Photonic bandstructure calculations reveal that the resulting lattices (direct and inverse) have promising optical properties, including a wide and complete photonic bandgap. The colloidal particles in the self-assembled cubic diamond structure are highly constrained and mechanically stable, which makes it possible to dry the suspension and retain the diamond structure. This makes these structures suitable templates for forming high-dielectric-contrast photonic crystals with cubic diamond symmetry. Self-assembly of cubic diamond crystals is demonstrated, by using precursor clusters of particles with carefully placed ‘sticky’ patches that attract and bind adjacent clusters in specific geometries.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>32968261</pmid><doi>10.1038/s41586-020-2718-6</doi><tpages>6</tpages><orcidid>https://orcid.org/0000-0003-2704-5578</orcidid><orcidid>https://orcid.org/0000-0002-3304-6684</orcidid><orcidid>https://orcid.org/0000-0001-8229-7925</orcidid><orcidid>https://orcid.org/0000-0002-8399-3524</orcidid><orcidid>https://orcid.org/0000-0003-1353-8988</orcidid><orcidid>https://orcid.org/0000-0002-8737-8668</orcidid><oa>free_for_read</oa></addata></record>
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language eng
recordid cdi_hal_primary_oai_HAL_hal_02986680v1
source Nature; Springer Nature - Complete Springer Journals
subjects 639/301/923/916
639/301/923/966
639/624/399/1096
Chemical Sciences
Colloids
Crystal defects
Crystal structure
Crystals
Deformation
Diamond crystals
Diamonds
Do-it-yourself work
Electromagnetic wave filters
Humanities and Social Sciences
Light emission
Material chemistry
Methods
multidisciplinary
Optical properties
Optical waveguides
Photonic band gaps
Photonic crystals
Polymerization
Production processes
Refractive index
Refractivity
Science
Science (multidisciplinary)
Self-assembly
Simulation
Spheres
Spontaneous emission
Structure
title Colloidal diamond
url https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-15T22%3A46%3A58IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-gale_hal_p&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Colloidal%20diamond&rft.jtitle=Nature%20(London)&rft.au=He,%20Mingxin&rft.date=2020-09-24&rft.volume=585&rft.issue=7826&rft.spage=524&rft.epage=529&rft.pages=524-529&rft.issn=0028-0836&rft.eissn=1476-4687&rft_id=info:doi/10.1038/s41586-020-2718-6&rft_dat=%3Cgale_hal_p%3EA636365646%3C/gale_hal_p%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2755621703&rft_id=info:pmid/32968261&rft_galeid=A636365646&rfr_iscdi=true