Browsing by Author "Hou, Chia-Hung"

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Diatom-assisted biomicroreactor targeting the complete removal of perfluorinated compounds
(2020-02-15)
Albert, Karunya
;
Hsieh, Pei-Ying
;
Chen, Tsai-Hsuan
;
Hou, Chia-Hung
;
Hsu, Hsin-Yun
Persistent perfluorinated compounds (PFCs) have been recognized as a global environmental issue. Developing methods without leading to additional burden in nature will be essential for PFCs removal. Herein, we functionalized iron nanoparticles on living diatom (Dt) to efficiently enable the Fenton reaction and reactive oxygen species (ROS) production. Iron nanoparticles at the surface of living diatom act as promising catalytic agents to trigger (OH)-H-center dot radical generation from H2O2. Dt plays dual roles: i) as solid support for effective adsorption, and ii) it supplies oxygen and inherently produces ROS under stress conditions, which improves removal efficiency of PFCs. We also demonstrated its reusability by simple magnetic separation and 85% of decomposition efficiency could still be achieved. This newly developed diatom-assisted bioremediation strategy enables green and efficient PFC decomposition and shall be readily applicable to other persistent pollutants.
High-efficiency InGaN-based LEDs grown on patterned sapphire substrates using nanoimprinting technology
(2013-05-01)
Lee, Yeeu-Chang
;
Yeh, Shiang-Chih
;
Chou, Yen-Yu
;
Tsai, Pei-Jung
;
Pan, Jui-Wen
This study employed roller imprint lithography and dry etching to fabricate patterned sapphire substrates (PSSs) of convex-shape with features of various heights. A soft polymer, polydimethylsiloxane (PDMS), was used as a mold to duplicate the pattern of a hard silicon template. The imprinted material was spin deposited onto a PDMS mold and transferred to the sapphire substrate using roller imprinting equipment. Inductive coupled plasma (ICP) etching was then used to fabricate the PSS. After epitaxial growth and chip processing, the current-voltage characteristics and light output of various LEDs were measured. The results demonstrate that the PSS process did not detract from the electrical properties of the LEDs; in fact, the output power of the proposed PSS LEDs was 25-30% greater than that of conventional LEDs. Simulation results show that PSS LEDs with structures of various heights would enhance optical efficiency in a manner similar to that demonstrated in these experiments. (C) 2013 Elsevier B.V. All rights reserved.