Chung-Kwei Lin - Academia.edu (original) (raw)

Papers by Chung-Kwei Lin

Research paper thumbnail of Gas sensors with porous three-dimensional framework using TiO2/polymer double-shell hollow microsphere

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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Research paper thumbnail of X-ray irradiation synthesis of PEG-coated Au-Pd nanoparticles

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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Research paper thumbnail of Uncapped Au-Pd colloidal nanoparticles show catalysis enhancement

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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Research paper thumbnail of Characterization and Modification of Nanocrystalline Iron Oxide Powders Prepared by an Inert Gas Condensation Technique

Materials Science Forum, 2007

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Research paper thumbnail of A study on the corrosion and erosion behavior of electroless nickel and TiAlN/ZrN duplex coatings on ductile iron

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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Research paper thumbnail of Influence of Fe3O4 Nanoparticles on Pseudocapacitive Behavior of the Charge Storage Process

Journal of Alloys and Compounds, 2015

ABSTRACT

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Research paper thumbnail of Preparation and characterization of nanocrystalline Nb3Al alloy

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Research paper thumbnail of Electrochromic performance of hybrid tungsten oxide films with multiwalled-CNT additions

Thin Solid Films, 2011

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Research paper thumbnail of Glass Forming Ability in Amorphous Ti<sub>50</sub>Cu<sub>35-x</sub>Ni<sub>15</sub>Sn<sub>x</sub> Alloys Prepared by Mechanical Alloying

Materials Science Forum, 2005

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Research paper thumbnail of Magnetic and structural properties of nanophase AgxFe1 − x solid solution particles

Nanostructured Materials, 1998

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Research paper thumbnail of Preparation of Mg-Y-Cu Bulk Metallic Glass by High Energy Ball Milling

Journal of Metastable and Nanocrystalline Materials, 2005

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Research paper thumbnail of Characterization of iron nitride powders formed by mechanical alloying and atmospheric heat treatment techniques

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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Research paper thumbnail of Preparation of iron nitride powders through mechanical alloying and atmospheric heat treatment

IEEE International Magnetics Conference, 1999

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Research paper thumbnail of The effect on the microstructures of electroless nickel coatings initiated by pulsating electric current

Thin Solid Films, 2007

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Research paper thumbnail of Stoichiometric Study of Iron Sulfide Prepared by Mechanochemical Reaction

Materials Science Forum, 2007

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Research paper thumbnail of Photocatalytic properties of nanocrystalline TiO2 thin film with Ag additions

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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Research paper thumbnail of Supercapacitive properties of spray pyrolyzed iron-added manganese oxide powders deposited by electrophoretic deposition technique

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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Research paper thumbnail of Bias effects on the tribological behavior of cathodic arc evaporated CrTiAlN coatings on AISI 304 stainless steel

Thin Solid Films, 2010

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Research paper thumbnail of Bias effects on microstructure, mechanical properties and corrosion resistance of arc-evaporated CrTiAlN nanocomposite films on AISI 304 stainless steel

Thin Solid Films, 2011

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Research paper thumbnail of Hybrid manganese oxide films for supercapacitor application prepared by sol–gel technique

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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Research paper thumbnail of Gas sensors with porous three-dimensional framework using TiO2/polymer double-shell hollow microsphere

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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Research paper thumbnail of X-ray irradiation synthesis of PEG-coated Au-Pd nanoparticles

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

Research paper thumbnail of Uncapped Au-Pd colloidal nanoparticles show catalysis enhancement

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

Research paper thumbnail of Characterization and Modification of Nanocrystalline Iron Oxide Powders Prepared by an Inert Gas Condensation Technique

Materials Science Forum, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A study on the corrosion and erosion behavior of electroless nickel and TiAlN/ZrN duplex coatings on ductile iron

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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Research paper thumbnail of Influence of Fe3O4 Nanoparticles on Pseudocapacitive Behavior of the Charge Storage Process

Journal of Alloys and Compounds, 2015

ABSTRACT

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Research paper thumbnail of Preparation and characterization of nanocrystalline Nb3Al alloy

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electrochromic performance of hybrid tungsten oxide films with multiwalled-CNT additions

Thin Solid Films, 2011

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Research paper thumbnail of Glass Forming Ability in Amorphous Ti<sub>50</sub>Cu<sub>35-x</sub>Ni<sub>15</sub>Sn<sub>x</sub> Alloys Prepared by Mechanical Alloying

Materials Science Forum, 2005

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Research paper thumbnail of Magnetic and structural properties of nanophase AgxFe1 − x solid solution particles

Nanostructured Materials, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Preparation of Mg-Y-Cu Bulk Metallic Glass by High Energy Ball Milling

Journal of Metastable and Nanocrystalline Materials, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Characterization of iron nitride powders formed by mechanical alloying and atmospheric heat treatment techniques

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 ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Preparation of iron nitride powders through mechanical alloying and atmospheric heat treatment

IEEE International Magnetics Conference, 1999

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The effect on the microstructures of electroless nickel coatings initiated by pulsating electric current

Thin Solid Films, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stoichiometric Study of Iron Sulfide Prepared by Mechanochemical Reaction

Materials Science Forum, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Photocatalytic properties of nanocrystalline TiO2 thin film with Ag additions

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

Research paper thumbnail of Supercapacitive properties of spray pyrolyzed iron-added manganese oxide powders deposited by electrophoretic deposition technique

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

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Bias effects on the tribological behavior of cathodic arc evaporated CrTiAlN coatings on AISI 304 stainless steel

Thin Solid Films, 2010

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Bias effects on microstructure, mechanical properties and corrosion resistance of arc-evaporated CrTiAlN nanocomposite films on AISI 304 stainless steel

Thin Solid Films, 2011

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Research paper thumbnail of Hybrid manganese oxide films for supercapacitor application prepared by sol–gel technique

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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