DSpace 集合:http://scholars.ntou.edu.tw/handle/123456789/2142024-03-28T15:18:29Z2024-03-28T15:18:29ZDeep-eutectic solution adding threonine additive associating with supercritical carbon dioxide to enhance zinc electroplating characteristicsLee, Chun-YingChen, Wei-YangChang, Jun-KaiLee, Hung-Binhttp://scholars.ntou.edu.tw/handle/123456789/247132024-03-06T03:51:34Z2024-01-01T00:00:00Z標題: Deep-eutectic solution adding threonine additive associating with supercritical carbon dioxide to enhance zinc electroplating characteristics
作者: Lee, Chun-Ying; Chen, Wei-Yang; Chang, Jun-Kai; Lee, Hung-Bin
摘要: Deep-eutectic solvent (DES) was used widely as an eco-friendly and sustainable process in the zinc (Zn) electroplating in this study. Both the conventional and supercritical carbon dioxide (SC-CO2) assisted electroplating processes were employed in the Zn plating on the copper substrate, respectively. Moreover, the effects of ascorbic acid (AA), nicotinic acid (NA) and threonine (Thr) additives were also investigated systematically. The Zn coating In the XRD result, the Zn texture of (0 0 2) and (1 0 1) as the (1 0 0) gradually vanished as the increase of Thr additive. Whether the use of the additives, the hardness of the prepared Zn coating from SC-CO2 assisted process was higher than conventional counterparts by 30 %. Moreover, the corrosion current density from the potentiodynamic polarization curve tended to be more passive by 55 %, manifesting that the AA and NA additives in the SC-CO2 assisted Zn electroplating was better in anticorrosion capability comparing its counterpart without additives. The current efficiency shew SC-CO2 Zn coating with Thr additive could gain a 15 % enhancement in compared to the conventional Thr-free Zn coating, making the coating more noble. Microstructures investigations using SEM showed the absence of cracking on surface. On the cross-sectional examination using TEM, a dual dense and porous layer structure were observed. EDS analysis revealed the Cu ions dissolving in the DES solution and reacted with Zn ions to for Cu-Zn alloy compounds as well as solid solution of Cu in the Zn coating while the TEM-EDS analysis showed the existence of an extraordinary Zn(Cu) and interfacial Cu-Zn alloy dual-layers. The possible ion-diffusion induced by DES mechanism causing this dual-layer and solid solution structure during the electroplating process in the DES electroplating solution was proposed.2024-01-01T00:00:00ZAg/Ag<sub>2</sub>S-TiO<sub>2</sub> composite film formed using dual phase Ag/Ag<sub>2</sub>O layer as a sulfurized layer for enhanced photocatalytic activityLiang, Yuan-ChangSun, Wei-Yanghttp://scholars.ntou.edu.tw/handle/123456789/246982024-03-06T03:51:30Z2023-01-01T00:00:00Z標題: Ag/Ag<sub>2</sub>S-TiO<sub>2</sub> composite film formed using dual phase Ag/Ag<sub>2</sub>O layer as a sulfurized layer for enhanced photocatalytic activity
作者: Liang, Yuan-Chang; Sun, Wei-Yang
摘要: The Ag/Ag2S-TiO2 composite films were synthesized through vulcanizing sputtering Ag/Ag2O dural-phase template capping layer on the TiO2 film. After hydrothermal vulcanization using thiourea as a sulfur precur-sor, the initially decorated Ag2O layer transformed into the Ag2S. The surface morphology of the continuous block structure of the Ag/Ag2S composite layer gradually shrinks to form irregular island grains dispersed on the surface of the composite film, with vulcanization reaction duration increased from one to 3 h. The light ab-sorption ability of the Ag/Ag2S-TiO2 composite film was enhanced substantially compared to the TiO2 film because of the surface plasmon resonance effect from the Ag particles and the narrow energy band of the Ag2S. Among various surface morphologies of the Ag/Ag2S-TiO2 composite films, the irregular island Ag/Ag2S grains -decorated TiO2 composite film presents superior photoelectrochemical and photocatalytic degradation perfor-mances than the composite films consisting of continuous block and spider-web structure of the Ag/Ag2S decorated layers. The synergistic effects of surface plasmon resonance, Ag pathway between the semiconductors, and Z-scheme charge transfer mechanism explain the high-efficiency photocatalytic activity of the Ag/Ag2S-TiO2 composite films.2023-01-01T00:00:00ZEndodontic Radiopacifying Application of Barium Titanate Prepared through a Combination of Mechanical Milling and Heat TreatmentLin, Hsiu-NaChen, Wei-WenHsu, Chun-ChunChen, May-ShowChang, Pei-JungChang, Wei-MinZhang, Fang-HaoChen, Chin-YiLee, Pee-YewLin, Chung-Kweihttp://scholars.ntou.edu.tw/handle/123456789/246792024-03-06T01:10:06Z2023-01-01T00:00:00Z標題: Endodontic Radiopacifying Application of Barium Titanate Prepared through a Combination of Mechanical Milling and Heat Treatment
作者: Lin, Hsiu-Na; Chen, Wei-Wen; Hsu, Chun-Chun; Chen, May-Show; Chang, Pei-Jung; Chang, Wei-Min; Zhang, Fang-Hao; Chen, Chin-Yi; Lee, Pee-Yew; Lin, Chung-Kwei
摘要: Mineral trioxide aggregates (MTA) are commonly used as endodontic filling materials but suffer from a long setting time and tooth discoloration. In the present study, the feasibility of using barium titanate (BTO) for discoloration and a calcium chloride (CaCl2) solution to shorten the setting time was investigated. BTO powder was prepared using high-energy ball milling for 3 h, followed by sintering at 700-1300 degrees C for 2 h. X-ray diffraction was used to examine the crystallinity and crystalline size of the as-milled and heat-treated powders. MTA-like cements were then prepared using 20-40 wt.% BTO as a radiopacifier and solidified using a 0-30% CaCl2 solution. The corresponding radiopacity, diametral tensile strength (DTS), initial and final setting times, and discoloration performance were examined. The experimental results showed that for the BTO powder prepared using a combination of mechanical milling and heat treatment, the crystallinity and crystalline size increased with the increasing sintering temperature. The BTO sintered at 1300 degrees C (i.e., BTO-13) exhibited the best radiopacity and DTS. The MTA-like cement supplemented with 30% BTO-13 and solidified with a 10% CaCl2 solution exhibited a radiopacity of 3.68 +/- 0.24 mmAl and a DTS of 2.54 +/- 0.28 MPa, respectively. In the accelerated discoloration examination using UV irradiation, the color difference was less than 1.6 and significantly lower than the clinically perceptible level (3.7). This novel MTA exhibiting a superior color stability, shortened setting time, and excellent biocompatibility has potential for use in endodontic applications.2023-01-01T00:00:00ZEnhanced optical sensing with metal-insulator-metal nanohole arrays integrated with silver nanoparticlesChu, Cheng HungLin, Gu YuWu, Pin ChiehChou, Wei-YangChen, Sy-HannLiang, Hsing-ChihChiang, Hai -Panghttp://scholars.ntou.edu.tw/handle/123456789/246762024-03-06T01:10:05Z2023-01-01T00:00:00Z標題: Enhanced optical sensing with metal-insulator-metal nanohole arrays integrated with silver nanoparticles
作者: Chu, Cheng Hung; Lin, Gu Yu; Wu, Pin Chieh; Chou, Wei-Yang; Chen, Sy-Hann; Liang, Hsing-Chih; Chiang, Hai -Pang
摘要: The field of plasmonic sensing has witnessed rapid advancements in recent years. This work proposes an innovative methodology that employs metal-insulator-metal (MIM) nanohole arrays integrated with ring-shaped silver nanoparticles (AgNPs) to serve as an effective plasmonic refractive index sensor. The hybrid substrates are prepared using a combination of nanosphere lithography (NSL), reactive ion etching, and an enhanced plasmonic site-selective photocatalytic reaction, ensuring large-area fabrication, high throughput, and cost-effectiveness. The resonance peaks observed in the visible-NIR spectra are attributed to the coupling of surface plasmon resonance modes between MIM structures and AgNPs. The resonance wavelength exhibits sensitively to changes in the surrounding medium within the refractive index range of 1 to 1.5, with a remarkable sensitivity of 835 nm/RIU. Our findings reveal the significant potential of this technology for advancing optical sensing applications.2023-01-01T00:00:00Z