Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Hung Ji Huang.
Journal of Applied Physics | 2016
Yuan-Fong Chou Chau; Chee Ming Lim; Chuanyo Lee; Hung Ji Huang; Chun-Ting Lin; N.T.R.N. Kumara; Voo Nyuk Yoong; Hai-Pang Chiang
Tunable surface plasmon resonance (SPR) and dipole cavity plasmon modes of the scattering cross section (SCS) spectra on the single solid-gold/gold-shell nanorod have been numerically investigated by using the finite element method. Various effects, such as the influence of SCS spectra under x- and y-polarizations on the surface of the single solid-gold/gold-shell nanorod, are discussed in detail. With the single gold-shell nanorod, one can independently tune the relative SCS spectrum width by controlling the rod length and rod diameter, and the surface scattering by varying the shell thickness and polarization direction, as well as the dipole peak energy. These behaviors are consistent with the properties of localized SPRs and offer a way to optically control and produce selected emission wavelengths from the single solid-gold/gold-shell nanorod. The electric field and magnetic distributions provide us a qualitative idea of the geometrical properties of the single solid-gold/gold-shell nanorod on plasmon resonance.
Journal of Optics | 2016
N.T.R.N. Kumara; Yuan-Fong Chou Chau; Jin-Wei Huang; Hung Ji Huang; Chun-Ting Lin; Hai-Pang Chiang
Simulations of surface plasmon resonance (SPR) on the near field intensity and absorption spectra of one-dimensional (1D) and two-dimensional (2D) periodic arrays of rod-shape metal nanoparticle (MNP) pairs using the finite element method (FEM) and taking into account the different core patterns for biosensor and solar cell applications are investigated. A tunable optical spectrum corresponding to the transverse SPR modes is observed. The peak resonance wavelength (λ res) can be shifted to red as the core patterns in rod-shape MNPs have been changed. We find that the 2D periodic array of core–shell MNP pairs (case 2) exhibit a red shifted SPR that can be tuned the gap enhancement and absorption efficiency simultaneously over an extended wavelength range. The tunable optical performances give us a qualitative idea of the geometrical properties of the periodic array of rod-shape MNP pairs on SPRs that can be as a promising candidate for plasmonic biosensor and solar cell applications.
Nanoscale Research Letters | 2015
Chun-Ting Lin; Ming-Hua Shiao; Mao-Nan Chang; Nancy Chu; Yu-Wei Chen; Yu-Hsuan Peng; Bo-Huei Liao; Hung Ji Huang; Chien-Nan Hsiao; Fan-Gang Tseng
In this paper, a facile two-step Galvanic replacement reaction (GRR) is proposed to prepare Pt-Ag tubular dendritic nano-forests (tDNFs) in ambient condition for enhancing methanol oxidation reaction (MOR) under solar illumination. In the first GRR, a homogeneous layer of silver dendritic nano-forests (DNFs) with 10xa0μm in thickness was grown on Si wafer in 5xa0min in silver nitride (AgNO3) and buffer oxide etchant (BOE) solution. In the second GRR, we utilized chloroplatinic acid (H2PtCl6) as the precursor for platinum (Pt) deposition to further transform the prepared Ag DNFs into Pt-Ag tDNFs. The catalytic performance and solar response of the Pt-Ag tDNFs toward methanol electro-oxidation are also studied by cyclic voltammetry (CV) and chronoamperometry (CA). The methanol oxidation current was boosted by 6.4% under solar illumination on the Pt-Ag tDNFs due to the induced localized surface plasmon resonance (LSPR) on the dendritic structure. Current results provide a cost-effective and facile approach to prepare solar-driven metallic electrodes potentially applicable to photo-electro-chemical fuel cells.
ACS Omega | 2018
Yuan-Fong Chou Chau; Chung-Ting Chou Chao; Chee Ming Lim; Hung Ji Huang; Hai-Pang Chiang
In this paper, the coupled Ag-shell/dielectric-core nanorod for sensor application is investigated and the different dielectric core plasmonic metamaterial is adopted in our design. The operational principle is based on the concept of combining the lattice resonance, localized surface plasmon resonance (SPR), and cavity plasmon resonance modes within the nanostructure. The underlying mechanisms are investigated numerically by using the three-dimensional finite element method and the numerical results of coupled solid Ag nanorods are included for comparison. The characteristic absorptance/reflectance peaks/dips have been demonstrated to be induced by different plasmonic modes that could lead to different responses required for plasmonic sensors. A nearly perfect absorptance and an approximate zero reflectance with a sharp band linewidth are obtained from the proposed system, when operated as an SPR sensor with the sensitivity and figure of merit of 757.58 nm/RIU (RIU is the refractive index unit) and 50.51 (RIU–1), respectively. Our work provides a promising method for the future developments of more advanced metamaterial absorber for chemical sensing, thermal radiation tailoring, field enhanced spectroscopy, and general filtering applications.
Journal of Solid State Electrochemistry | 2018
Ming-Hua Shiao; Chun-Ting Lin; Hung Ji Huang; Ping-Hsi Chen; Bo-Huei Liao; Fan-Gang Tseng; Yung-Sheng Lin
This study demonstrates the elaboration of a novel composite comprising gold dendritic nanoflowers (Au DNFs)/titanium nitride (TiN)/silicon (Si); this composite can be used for methanol oxidation reactions in alkaline electrolytes. Cyclic voltammograms showed that a thick (650xa0nm) Au DNFs/TiN/Si (L-DNFs-TiN) composite had double the oxidation current density of a thick (800xa0nm) Au DNFs/Si (L-DNFs-Si) composite in the presence of light illumination, whereas the oxidation current density for a thin (250xa0nm) Au DNFs/Si (S-DNFs-Si) composite and Au nanoparticles could not be determined. Chronoamperometry (CA) testing indicated that the L-DNFs-TiN could absorb light illumination more effectively than the L-DNFs-Si did. These results correspond to the broadband light absorption of TiN. Testing with continuous cyclic on/off light illumination showed a repeatable performance in CA, indicating that the proposed L-DNFs-TiN composite can be applied in photoelectrochemical cells in the future.
The 7th International Multidisciplinary Conference on Optofluidics 2017 | 2017
Hung Ji Huang; Chih-Chung Yang; Chun-Ting Lin; Hai-Pang Chiang; Yuan-Fong Chou Chau; Chi-Hung Hwang
This paper reports a new design of micro optofluidic chips in the application of plasmonic photocatalytic oxidization of Ammonium ions (NH4+) dissolved in water under light illumination, Fig. 1. In this report, the Au nanoparticles (NPs) replaced the typically used catalyst in typical artificial nitrogen cycle. The micro optical fluidic chip (MOFC) reactor is good with high mass transfer rate that can enhance processing efficiency of chemical reaction [1]. The UV light transmittable construction material, e.g. glass, Polydimethylsiloxane (PDMS), or NOA81 [1], makes the MOFC perfectly suitable for photocatalytic reaction. nTypically, artificial nitrogen cycle processes via the wet air oxidization (WAO) method oxidize and eliminate the dissolved NH4+ from water with temperature higher than 150 °C and high pressure. The plasmonic heating in metal nanostructures and localized high temperature under light illumination enhances chemical reactions [2-5]. In this study, the pre-deposited layer of (3-Aminopropyl)trimethoxysilane (APTMS) fixed various sized Au NPs on the inner walls of the flow channel, Fig. 2. The pink color in the lower chip is coming from the scattering light of the fixed Au nanoparticles with size of 20 nm. Only the area of the rectangle fluidic channel, 2 cm (W) × 3 cm (L) × 58 μm (H), deposited with APTMS layer can catch Au NPs, see SEM data in Fig. 3. No obvious depletion observed after the experiments of NH4+ oxidization under alkaline conditions. nThe MOFC reactor with or without fixed 20 nm Au nanoparticles presented oxidization of NH4+ ions dissolved in water under light illumination, Fig. 1. Two array of profusion channels with 10 μm in width separated and limited the water flow-in speed from input-reservoir. External visible light supplied by halogen lamps illuminated the channel and induce surface plasmon resonances on Au nanoparticles. Two groups of experiments with various flow speed of test solution processed under alkaline condition with adding sodium hydroxide (NaOH). The pH adjustment increased the initial pH value to about 11.5 and supplied hydroxide ions (OH¯) for oxidization of NH4+ ions in water. nThe reserved NH4+ ions in test solution after experiments with various water pumping flow speed was measured and depicted in Fig. 4. The experiments with fixed Au NPs had concentration of reserved NH4+ smaller than that with no Au NPs after 1 hr of processing time. The Au nanoparticles presented plasmonic enhancement of the chemical catalytic oxidization of NH4+ ions in water in the MOFC reactor. nxa0 nIn conclusion, the plasmonic oxidation of NH4+ ions in water presented inside the MOFC reactor with Au NPs as photocatalyst. The MOFC reactor shows great potential for further investigation in the future.
Microelectronic Engineering | 2011
Chun-Ting Lin; Hung Ji Huang; Jr-Jung Yang; Ming-Hua Shiao
Electrochimica Acta | 2016
Chun-Ting Lin; Mao-Nan Chang; Hung Ji Huang; Ching-Hao Chen; Ru-Jing Sun; Bo-Huei Liao; Yuan-Fong Chou Chau; Chien-Nan Hsiao; Ming-Hua Shiao; Fan-Gang Tseng
Optics Communications | 2016
Li-Zen Hsieh; Yuan-Fong Chou Chau; Chee Ming Lim; Mo-Hua Lin; Hung Ji Huang; Chun-Ting Lin; Idris Muhammad Nur Syafi’ie
Journal of Physics D | 2017
Hung Ji Huang; Bo-Heng Liu; James Su; Po-Jui Chen; Chun-Ting Lin; Hai-Pang Chiang; Tsung Sheng Kao; Yuan-Fong Chou Chau; Chi-Chung Kei; Chi-Hung Hwang