Superparamagnetic nickel ferrite colloidal spheres for constructing magnetically responsive photonic crystals

NiO-SiO2 composite photonic crystals were fabricated by the self-assembly and the spin coating method. First, the SiO2 monodisperse colloidal spheres were fabricated by the Storber method and the opal structure was obtained by the vertical deposition method. After spin coating and sintering, the electrochromic material NiO was infiltrated in the opal template. The obtained NiO-SiO2 composite photonic crystal was characterized by X-ray diffraction (XRD), and the morphologies of SiO2 opals and the composite structures were characterized by SEM. The reflection spectra were measured and revealed that the periodic arrays exhibit a photonic band gap in the (111) direction.

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Constrained Growth of the PMMA Photonic Crystals

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.121-123.433 ◽

2007 ◽

Vol 121-123 ◽

pp. 433-436

Author(s):

Fu Yi Chen ◽

Wan Qi Jie

Keyword(s):

Photonic Crystals ◽

Rough Interface ◽

Growth Interface ◽

Continuous Growth ◽

Vertical Deposition ◽

Typical Sample ◽

Colloidal Spheres ◽

Perfect Order ◽

Bulk Structure ◽

Crystalline Array

The constrained growth was observed during the formation process of the photonic crystals from the monodispersed PMMA colloidal microsphere and a controllable vertical deposition (CVD) technology was developed to prepare the photonic crystal based on these growth behaviors and the PMMA colloid particles with size of 345nm were assembled into the 3-D arrays. The transmittance spectrum of the typical sample exhibited an enlarged transmission mode. Their SEM observation revealed that the bulk structure of the crystalline array had a high periodical and long range order, the perfect order zone was above 20μm and the surface of the crystal was complete flat and had only two vacancies in the 35 μm order zone. The growth interface analysis indicated that the colloidal spheres sedimented subsequently and the drying front between the suspension and crystal moved at a constant velocity with time. The crystals developed by the continuous growth mechanism and the growing crystals had rough interface during the process of controllable vertical deposition.

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Composite Photonic Crystals from Semiconductor Nanocrystal/Polyelectrolyte-Coated Colloidal Spheres

Chemistry of Materials ◽

10.1021/cm031003o ◽

2003 ◽

Vol 15 (14) ◽

pp. 2724-2729 ◽

Cited By ~ 71

Author(s):

Dayang Wang ◽

Andrey L. Rogach ◽

Frank Caruso

Keyword(s):

Photonic Crystals ◽

Semiconductor Nanocrystal ◽

Colloidal Spheres

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Self-assembled 3D photonic crystals from ZnO colloidal spheres

Materials Chemistry and Physics ◽

10.1016/s0254-0584(02)00492-3 ◽

2003 ◽

Vol 80 (1) ◽

pp. 257-263 ◽

Cited By ~ 156

Author(s):

Eric W. Seelig ◽

Betty Tang ◽

Alexey Yamilov ◽

Hui Cao ◽

R.P.H. Chang

Keyword(s):

Photonic Crystals ◽

Colloidal Spheres ◽

Self Assembled

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Bioassay Based on Photonic Crystal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.47-50.1323 ◽

2008 ◽

Vol 47-50 ◽

pp. 1323-1326 ◽

Cited By ~ 1

Author(s):

Xiang Wei Zhao ◽

Hua Xu ◽

Zhong Ze Gu

Keyword(s):

Photonic Crystal ◽

Photonic Crystals ◽

Self Assembly ◽

Colloidal Crystals ◽

Fluorescence Signal ◽

Colloidal Spheres ◽

Colloidal Photonic Crystals

Photonic crystals have wide applications not only in optoelectronic fields but also in bioassays. In this review, we summarized our work on colloidal photonic crystals as novel biomolecular supports in multiplex bioassays. Except for enhancing the fluorescence signal and encoding the biomolecular carriers in fluorphore labeled bioassays, photonic crystal can also encode suspended arrays. From the point view of practicality, the synthesis and self-assembly of monodispersed colloidal spheres for colloidal crystals is involved.

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