Browsing by Author "Huang, Yi-Jui"

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A facile approach to fabricate Ni inverse opals at controlled thickness
(2009-11-15)
Huang, Yi-Jui
;
Lai, Chun-Han
;
Wu, Pu-Wei
;
Chen, Li-Yin
;
材料科學與工程學系
A vertical electrophoretic deposition method was employed to fabricate polystyrene (PS) colloidal crystals with negligible defects and considerable surface uniformity. Subsequently, the interstitial voids within the colloidal crystals were electroplated with Ni, followed by selective removal of the PS microspheres. With careful adjustment in the processing parameters. we were able to obtain Ni inverse opals at predetermined thickness in relatively short time. The inverse opals revealed superb structural stability and surface uniformity. Because the electrophoresis and electrodeposition were both carried out in a solution state, this fabrication scheme enables facile construction of inverse opals on conductive substrates over conventional approaches. (C) 2009 Elsevier B.V. All rights reserved.
Effect of Crystallinity on the Optical Reflectance of Cylindrical Colloidal Crystals
(2011)
Lai, Chun-Han
;
Yang, Yu-Lin
;
Chen, Li-Yin
;
Huang, Yi-Jui
;
Chen, Jing-Yu
We fabricate cylindrical colloidal crystals (CCCs) via electrophoretic depositions of polystyrene microspheres on a carbon fiber in a concentric arrangement. Images from optical and scanning electron microscope indicate that the CCCs of 460 nm microspheres reveal a semicrystalline structure in close-packed lattice, while the CCCs of 660 exhibit an amorphous arrangement. In optical reflectance spectra, both CCCs demonstrate a dispersive photonic bandgap as compared to that from planar counterparts. The curved contour for the CCCs renders incident light interacting with reflecting planes at slightly different angles, leading to a notable reduction in the reflectance intensity and minor relocation of photonic bandgap contingent on their crystallinity. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3536511] All rights reserved.
Fabrication of Large-Area Colloidal Crystals by Electrophoretic Deposition in Vertical Arrangement
(2008)
Huang, Yi-Jui
;
Lai, Chun-Han
;
Wu, Pu-Wei
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Fabrication of large-area colloidal crystals (400 mu m(2)) with superb uniformity in multiple layers (similar to 128 layers) from SiO(2) microspheres (similar to 400 nm) was achieved by electrophoresis in vertical arrangement. With a large difference in electrode areas and selection of ethanol as the solvent, we investigated self-assembly with SiO(2) suspensions at various pH and electric fields of 20-100 V cm(-1). Colloid formations with negligible vacancies and small-angle grain boundaries were obtained at a suspension of pH approximate to 10 and electric field of 20 V cm(-1). Our fabrication scheme enables construction of colloidal crystals with significantly reduced structural disorders as compared to conventional routes. (C) 2008 The Electrochemical Society.
Facile Electrochemical Fabrication of Large-Area ZnO Inverse Opals with Reduced Defects
(2011)
Huang, Yi-Jui
;
Liao, Chen-Hong
;
Huang, Bo-Han
;
Chen, Wan-Ying
;
Wu, Pu-Wei
We demonstrate a facile fabrication scheme to construct large-area ZnO inverse opals on an indium-tin-oxide substrate with significantly reduced defects and improved stoichiometry. The fabrication steps involve the preparation of colloidal template via vertical electrophoresis of polystyrene (PS) microspheres in 720 nm radius, followed by galvanostatic electrodeposition of ZnO in the interstitial voids among the PS microspheres. Subsequently, the sample undergoes a heat-treatment in air at 500 degrees C for different time to remove the colloidal template, leaving an integral ZnO skeleton with thickness adjusted by the electrodeposition time. Since the colloidal template is deliberately designed with desirable thickness and considerable uniformity, the electroplating of ZnO can be achieved in a reduced ethanol/water ratio that allows faster growth rate and improved ZnO structure. Scanning electron microscope images demonstrate negligible microstructural defects for the ZnO inverse opals. X-ray diffraction reveals a wurtzite hexagonal lattice with (002) preferred orientation. In addition, both X-ray photoelectron spectroscopy and photoluminescence spectra suggest improved crystallinity and stoichiometry with increasing heat-treatment time. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3552604] All rights reserved.
Ni Inverse Opals for Water Electrolysis in an Alkaline Electrolyte
(2010)
Huang, Yi-Jui
;
Lai, Chun-Han
;
Wu, Pu-Wei
;
Chen, Li-Yin
;
材料科學與工程學系
A vertical electrophoretic deposition technique was employed to prepare polystyrene (PS) colloidal crystals with negligible crystallographic defects. The colloidal crystals were plated with Ni, followed by selective removal of PS microspheres to fabricate inverse opals. With adjustments in relevant processing parameters, we were able to obtain inverse opals in multiple layers with excellent surface uniformities. The inverse opals were used as the electrode material for water electrolysis. Results from current-potential polarizations in 1 M KOH aqueous solution indicated that the catalytic abilities for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) increased with the layers of inverse opals. Estimation of the effective current densities determined that the entire area of the inverse opals was available for electrochemical reactions. In galvanostatic measurements for both OER and HER, the inverse opals demonstrated stable voltage profiles without notable degradations for 120 h. Compared with a planar Ni plate, the inverse opals exhibited a significantly reduced overpotential for the water electrolysis.
Rapid Fabrication of Cylindrical Colloidal Crystals and Their Inverse Opals
(2010)
Lai, Chun-Han
;
Huang, Yi-Jui
;
Wu, Pu-Wei
;
Chen, Li-Yin
;
材料科學與工程學系
We employed an electrophoretic deposition technique to prepare cylindrical colloidal crystals (CCCs) from polystyrene (PS) microspheres of 460 and 660 nm diameters using a carbon fiber (CF) with 7 mu m diameter as the substrate. Measurements on the CCC diameter demonstrated growth rates that slowed down as time progressed. Scanning electron microscope images confirmed that the CCCs of 460 nm microspheres formed a face-centered cubic close-packed lattice, whereas an amorphous structure appeared for the CCCs of 660 nm. Subsequently, both CCCs underwent a potentiostatic electroplating to deposit Ni into the interstitial voids among the PS microspheres. After chemical removal of the PS microspheres, we fabricated cylindrical inverse opals (CIOs) in various diameters. As expected, better crystallinity was found on the CIOs of 460 nm microspheres as opposed to the 660 nm ones. The electrical resistivity for both CIOs exhibited a substantial reduction over that of the CF. Our CCCs and CIOs revealed considerable structure stability with excellent surface uniformity. The fabrication scheme enables rapid preparations of CCCs and CIOs in desirable lengths and diameters.