Research articles
ScienceAsia 51 (2023): 1-7 |doi:
10.2306/scienceasia1513-1874.2023.004
Microscopic and spectroscopic investigation of deposited thin
opal films using an electric field assisted capillary deposition
method
Muhammad Engki Saputraa, Mulda Muldarisnura,*, Frank Marlowb, Dahyunir Dahlana
ABSTRACT: Despite being a preferred approach for fabricating three-dimensional photonic crystals, self-assembly of
colloidal particles is indispensably restricted by internal defects. External fields like electric fields may provide more
controlled self-assembly by tuning colloidal particles? movement, aggregation, and ordering processes. This research
aimed to improve the quality of opal films deposited using the capillary deposition method by applying a direct current
(DC) electric field. DC electric field of 150 V/cm was applied to planar cells to influence self-assembly. We varied
the relative orientation of gravitation and Coulomb force by depositing opal at an inclined angle of 0? ? ? ? 90? with
steps of 15?. This inclination corresponds to the parallel and perpendicular orientation of these forces. Microscopic
and spectroscopic investigations revealed convincing influences of inclination angle on crystal domain size and optical
properties of the resulting opal films. The largest average crystal domain area of 138 mm2
and the most homogeneous
opalescent films were obtained for an inclination angle of 45?. Maximum absorbance, background, and Bragg peak
width also appeared at an inclination angle of 45?. This work shows the possibility of improving opal film quality using
a DC electric field.
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| a |
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Andalas, Padang 25163 Indonesia |
| b |
Max Planck Institut f?r Kohlenforschung, 45470 M?lheim an der Ruhr, Germany |
* Corresponding author, E-mail: muldarisnur@sci.unand.ac.id
Received 0 0000, Accepted 3 Nov 2024
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