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Effects of processing parameters on 3D structural ordering and optical properties of inverse opal photonic crystals produced by atomic layer deposition
Citation Link: https://doi.org/10.15480/882.2547
Publikationstyp
Journal Article
Date Issued
2019-07-03
Sprache
English
TORE-DOI
TORE-URI
Volume
1
Issue
2
Start Page
68
End Page
76
Citation
International Journal of Ceramic Engineering & Science 2 (1): 68-76 (2019)
Publisher DOI
Publisher
Wiley
Vertical convective self‐assembly has been extensively used for the preparation of
direct photonic crystals, which can be later infiltrated with a more stable material,
such as oxide ceramics, by atomic layer deposition. However, the relationship between
the self‐assembly parameters of the direct photonic crystals and the optical
properties of the inverse opal photonic crystals remains elusive. In this work, the
effect of different experimental parameters on the 3D structure and the density of
defects of polystyrene direct photonic crystals produced by vertical convective selfassembly
was assessed. Self‐assembly was investigated using deionized water as
media with polymer particles’ concentrations up to 2 mg/mL; temperatures of 40,
50, and 80°C; and relative humidity of 45%, 70%, and 90%. The 3D structure of the
resultant direct photonic materials was characterized by the combination of scanning
electron microscopy and image analysis, and their optical properties were assessed
by reflectance measurements. These results were correlated with the performance of
oxide‐based inverse opal photonic crystals produced by the controlled infiltration of
the former direct photonic crystals by atomic layer deposition (ALD). It was found
that the thickness increased with the concentration of polystyrene particles, while the
photonic structure ordering is dependent on the synergy between humidity and temperature.
Results also showed higher defects population with increasing evaporation
temperature and decreasing relative humidity.
direct photonic crystals, which can be later infiltrated with a more stable material,
such as oxide ceramics, by atomic layer deposition. However, the relationship between
the self‐assembly parameters of the direct photonic crystals and the optical
properties of the inverse opal photonic crystals remains elusive. In this work, the
effect of different experimental parameters on the 3D structure and the density of
defects of polystyrene direct photonic crystals produced by vertical convective selfassembly
was assessed. Self‐assembly was investigated using deionized water as
media with polymer particles’ concentrations up to 2 mg/mL; temperatures of 40,
50, and 80°C; and relative humidity of 45%, 70%, and 90%. The 3D structure of the
resultant direct photonic materials was characterized by the combination of scanning
electron microscopy and image analysis, and their optical properties were assessed
by reflectance measurements. These results were correlated with the performance of
oxide‐based inverse opal photonic crystals produced by the controlled infiltration of
the former direct photonic crystals by atomic layer deposition (ALD). It was found
that the thickness increased with the concentration of polystyrene particles, while the
photonic structure ordering is dependent on the synergy between humidity and temperature.
Results also showed higher defects population with increasing evaporation
temperature and decreasing relative humidity.
Subjects
3D structure
optical properties
photonic materials
vertical convective self‐assembly
DDC Class
600: Technik
More Funding Information
Financial support from the German Research Foundation (DFG) via SFB 986 “M3,” projects UA‐UHH and C5. The authors also acknowledge financial support from the PROBRAL program, a partnership between the German Academic Exchange Service (DAAD) and the Brazilian Federal Agency for Post‐graduate Education (CAPES) through the project 23038.006803/2014‐50.
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