Chung-Kwei Lin - Academia.edu (original) (raw)
Papers by Chung-Kwei Lin
Thin Solid Films, 2011
The correlations between the structures and gas-sensing properties of porous thin-film gas sensor... more The correlations between the structures and gas-sensing properties of porous thin-film gas sensors made of packed hollow spheres are investigated. For this purpose, hollow polymeric spheres were used as templates. Double-shell hollow spheres were prepared by encapsulating the polymeric hollow spheres with TiO2 shells. Solid polymeric spheres were used as templates for comparison. Porous thin-film gas sensor with interconnected three-dimensional pores was prepared by using the TiO2 encapsulated hollow spheres. The double-shell hollow spheres and porous titania films were characterized by XRD, BET, TEM and SEM. The gas-sensing properties of the sensors toward NO2 depend on the type of template and the three-dimensional porous structure of the films. Using the hollow sphere template and adding precursors during the film formation procedure help to prevent the collapse of hollow sphere and form the mesopores in films after removing the template. These films show enhanced gas sensitivity when compared to TiO2 polycrystalline films. Such improvement in sensitivity results from the porous architecture of the hollow microsphere films which not only increase the active surface area but also promotes the gas diffusion.
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Nanotechnology, Jan 4, 2015
We demonstrate that the combination of x-ray irradiation and capping by polyethylene glycol (PEG)... more We demonstrate that the combination of x-ray irradiation and capping by polyethylene glycol (PEG) produces excellent flexibility in controlling the structure of Au-Pd nanoparticles while preserving their catalytic performance. We specifically adopted two different fabrication methods: co-reduction and seed-assisted reduction. In both cases, precursor composition plays an important role in controlling the phases and size of the bimetallic nanoparticles. The optimal catalytic performance is obtained with the highest Pd concentration and when the nanoparticles consist of a Au core and a Pd shell.
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RSC Adv., 2015
ABSTRACT The catalytic properties of Pd trigger a strong interest on the related catalysis by Au-... more ABSTRACT The catalytic properties of Pd trigger a strong interest on the related catalysis by Au-Pd nanoparticles. However, the analysis of such phenomena was complicated so far by the presence of capping. Using x-ray irradiation, we could produce uncapped Au-Pd nanoparticles and study their catalytic features, finding in particular their relation to the Pd content. Furthermore, the fabrication process is per se interesting, yielding excellent and flexibly controllable nanoparticles with a rather simple procedure.
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Materials Science Forum, 2007
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Applied Surface Science
This study utilized electroless nickel (EN) and cathodic arc evaporation (CAE) technologies to de... more This study utilized electroless nickel (EN) and cathodic arc evaporation (CAE) technologies to deposit protective coatings onto ductile iron. Polarization corrosion tests were performed in 3.5 wt.% sodium chloride, and also erosion tests were carried out by using Al2O3 particles (∼177 μm in size and Mohr 7 scale) of about 5 g. Surface morphologies of the corroded and eroded specimens were observed separately. To further understand the coating effects on both the corrosive and erosive behavior of ductile iron, coating structure, morphology, and adhesion were analyzed using X-ray diffractormeter, scanning electron microscopy, and Rockwell-C indenter, respectively. The results showed that the EN exhibited an amorphous structure while the CAE-TiAlN/ZrN coating was a multilayered nanocrystalline. When the TiAlN/ZrN coated specimen with EN interlayer could effectively increase the adhesion strength between the CAE coating and substrate. Consequently, the combination of TiAlN/ZrN and EN de...
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Journal of Alloys and Compounds, 2015
ABSTRACT
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Thin Solid Films, 2011
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Materials Science Forum, 2005
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Nanostructured Materials, 1998
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Journal of Metastable and Nanocrystalline Materials, 2005
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Journal of the Chinese Institute of Engineers, 2001
... the same trend as the one found in several alloy systems, such as Ni-Nb (Lee and Koch, 1987) ... more ... the same trend as the one found in several alloy systems, such as Ni-Nb (Lee and Koch, 1987) and Co-Ta (Pee-Yew Lee and Ju ... Jack (1994) has reported the transient appearance of the α′′-Fe16N2 phase by aging a supersaturated Fe solid solution at 250°C. Different phase ...
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IEEE International Magnetics Conference, 1999
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Thin Solid Films, 2007
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Materials Science Forum, 2007
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Thin Solid Films, 2006
... This project was funded by Feng Chia University Distinguished Research Program, Grant number:... more ... This project was funded by Feng Chia University Distinguished Research Program, Grant number: FCU-92GB18. References. [1] C. He, Y. Yu, X. Hu and A. Larbot. Appl. Surf. ... Ceram. Soc., 76 (1993), p. 2093. [12] HE Chao, YU Yun, HU Xingfang and A. Larbot. J. Eur. Ceram. ...
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Thin Solid Films, 2008
Nanocrystalline iron-added manganese oxide powders were prepared by spray pyrolysis (SP) from man... more Nanocrystalline iron-added manganese oxide powders were prepared by spray pyrolysis (SP) from manganese acetate and iron nitrate solutions at 400 °C. The as-obtained powders were subsequently deposited onto graphite substrates via an electrophoretic deposition technique (EPD). The as-prepared powders were examined by transmission electron microscopy (TEM) and X-ray diffractometry (XRD); the electrochemical properties of the coatings were further examined by cycling
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Thin Solid Films, 2010
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Thin Solid Films, 2011
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Thin Solid Films, 2009
Hybrid films were prepared by adding various concentrations of meso-carbon microbeads (MCMB) duri... more Hybrid films were prepared by adding various concentrations of meso-carbon microbeads (MCMB) during sol–gel processing of manganese oxide films. The heat-treated films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). In addition, electrochemical performance of the MCMB-added Mn-oxide hybrid coatings was evaluated by cyclic voltammetry (CV) and compared with its unadded counterpart. Experimental results showed that Mn-oxide
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Thin Solid Films, 2011
The correlations between the structures and gas-sensing properties of porous thin-film gas sensor... more The correlations between the structures and gas-sensing properties of porous thin-film gas sensors made of packed hollow spheres are investigated. For this purpose, hollow polymeric spheres were used as templates. Double-shell hollow spheres were prepared by encapsulating the polymeric hollow spheres with TiO2 shells. Solid polymeric spheres were used as templates for comparison. Porous thin-film gas sensor with interconnected three-dimensional pores was prepared by using the TiO2 encapsulated hollow spheres. The double-shell hollow spheres and porous titania films were characterized by XRD, BET, TEM and SEM. The gas-sensing properties of the sensors toward NO2 depend on the type of template and the three-dimensional porous structure of the films. Using the hollow sphere template and adding precursors during the film formation procedure help to prevent the collapse of hollow sphere and form the mesopores in films after removing the template. These films show enhanced gas sensitivity when compared to TiO2 polycrystalline films. Such improvement in sensitivity results from the porous architecture of the hollow microsphere films which not only increase the active surface area but also promotes the gas diffusion.
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Nanotechnology, Jan 4, 2015
We demonstrate that the combination of x-ray irradiation and capping by polyethylene glycol (PEG)... more We demonstrate that the combination of x-ray irradiation and capping by polyethylene glycol (PEG) produces excellent flexibility in controlling the structure of Au-Pd nanoparticles while preserving their catalytic performance. We specifically adopted two different fabrication methods: co-reduction and seed-assisted reduction. In both cases, precursor composition plays an important role in controlling the phases and size of the bimetallic nanoparticles. The optimal catalytic performance is obtained with the highest Pd concentration and when the nanoparticles consist of a Au core and a Pd shell.
Bookmarks Related papers MentionsView impact
RSC Adv., 2015
ABSTRACT The catalytic properties of Pd trigger a strong interest on the related catalysis by Au-... more ABSTRACT The catalytic properties of Pd trigger a strong interest on the related catalysis by Au-Pd nanoparticles. However, the analysis of such phenomena was complicated so far by the presence of capping. Using x-ray irradiation, we could produce uncapped Au-Pd nanoparticles and study their catalytic features, finding in particular their relation to the Pd content. Furthermore, the fabrication process is per se interesting, yielding excellent and flexibly controllable nanoparticles with a rather simple procedure.
Bookmarks Related papers MentionsView impact
Materials Science Forum, 2007
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Applied Surface Science
This study utilized electroless nickel (EN) and cathodic arc evaporation (CAE) technologies to de... more This study utilized electroless nickel (EN) and cathodic arc evaporation (CAE) technologies to deposit protective coatings onto ductile iron. Polarization corrosion tests were performed in 3.5 wt.% sodium chloride, and also erosion tests were carried out by using Al2O3 particles (∼177 μm in size and Mohr 7 scale) of about 5 g. Surface morphologies of the corroded and eroded specimens were observed separately. To further understand the coating effects on both the corrosive and erosive behavior of ductile iron, coating structure, morphology, and adhesion were analyzed using X-ray diffractormeter, scanning electron microscopy, and Rockwell-C indenter, respectively. The results showed that the EN exhibited an amorphous structure while the CAE-TiAlN/ZrN coating was a multilayered nanocrystalline. When the TiAlN/ZrN coated specimen with EN interlayer could effectively increase the adhesion strength between the CAE coating and substrate. Consequently, the combination of TiAlN/ZrN and EN de...
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Journal of Alloys and Compounds, 2015
ABSTRACT
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Thin Solid Films, 2011
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Materials Science Forum, 2005
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Nanostructured Materials, 1998
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Journal of Metastable and Nanocrystalline Materials, 2005
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Journal of the Chinese Institute of Engineers, 2001
... the same trend as the one found in several alloy systems, such as Ni-Nb (Lee and Koch, 1987) ... more ... the same trend as the one found in several alloy systems, such as Ni-Nb (Lee and Koch, 1987) and Co-Ta (Pee-Yew Lee and Ju ... Jack (1994) has reported the transient appearance of the α′′-Fe16N2 phase by aging a supersaturated Fe solid solution at 250°C. Different phase ...
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IEEE International Magnetics Conference, 1999
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Thin Solid Films, 2007
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Materials Science Forum, 2007
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Thin Solid Films, 2006
... This project was funded by Feng Chia University Distinguished Research Program, Grant number:... more ... This project was funded by Feng Chia University Distinguished Research Program, Grant number: FCU-92GB18. References. [1] C. He, Y. Yu, X. Hu and A. Larbot. Appl. Surf. ... Ceram. Soc., 76 (1993), p. 2093. [12] HE Chao, YU Yun, HU Xingfang and A. Larbot. J. Eur. Ceram. ...
Bookmarks Related papers MentionsView impact
Thin Solid Films, 2008
Nanocrystalline iron-added manganese oxide powders were prepared by spray pyrolysis (SP) from man... more Nanocrystalline iron-added manganese oxide powders were prepared by spray pyrolysis (SP) from manganese acetate and iron nitrate solutions at 400 °C. The as-obtained powders were subsequently deposited onto graphite substrates via an electrophoretic deposition technique (EPD). The as-prepared powders were examined by transmission electron microscopy (TEM) and X-ray diffractometry (XRD); the electrochemical properties of the coatings were further examined by cycling
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Thin Solid Films, 2010
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Thin Solid Films, 2011
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Thin Solid Films, 2009
Hybrid films were prepared by adding various concentrations of meso-carbon microbeads (MCMB) duri... more Hybrid films were prepared by adding various concentrations of meso-carbon microbeads (MCMB) during sol–gel processing of manganese oxide films. The heat-treated films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). In addition, electrochemical performance of the MCMB-added Mn-oxide hybrid coatings was evaluated by cyclic voltammetry (CV) and compared with its unadded counterpart. Experimental results showed that Mn-oxide
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