Hui-Jan Lin - Academia.edu (original) (raw)
Papers by Hui-Jan Lin
YInGe 2 O 7 /xTm samples, with x = 0-7 mol %, exhibit an emission in the blue region with a domin... more YInGe 2 O 7 /xTm samples, with x = 0-7 mol %, exhibit an emission in the blue region with a dominant wavelength of 1 D 2 → 3 F 4 at 453 nm. The energy is absorbed by the Tm 3ϩ ion to the 1 D 2 emitting level, then transferred to a lower state via radiative transition. A single exponential decay behavior was observed for diluted samples, and a nonexponential decay behavior occurred when YInGe 2 O 7 was doped with a higher Tm 3+ ion concentration. The saturation of emission intensity excited by intra-4f transitions occurred at a concentration of x = 0.04, indicating that the concentration quenching is active when x Ͼ 0.04. © 2007 The Electrochemical Society. ͓DOI: 10.1149/1.2732076͔ All rights reserved. Oxide phosphors have recently gained much attention for applications such as screens in plasma display panels and field-emission displays and for white color light-emitting diodes because of their higher chemical stability and resistance to moisture relative to that of sulfide/phosphor...
Journal of Materials Chemistry A
Thermally stable perovskite nanoparticles significantly enhance the NO2 gas sensitivity of β-Ga2O... more Thermally stable perovskite nanoparticles significantly enhance the NO2 gas sensitivity of β-Ga2O3 nanorods at 800 °C. The p–n junction interface plays an important role in improving the gas sensor performance.
Journal of Materials Chemistry A
Copper manganese oxide (CuMn2O4) was introduced into the nanoarray-based monolithic catalysts sys... more Copper manganese oxide (CuMn2O4) was introduced into the nanoarray-based monolithic catalysts system for advanced exhaust after-treatment.
Science of Advanced Materials, 2012
ABSTRACT We have grown ZnO, ZnS, NiO and SiOx nanowires or nanorods using a combination of stress... more ABSTRACT We have grown ZnO, ZnS, NiO and SiOx nanowires or nanorods using a combination of stress induced recrystallization and in-situ carbothermal method in the tubular furnace. In this method, nanofilm of the desired material sputtered on silicon/quartz was kept at a certain distance from the graphite source in the presence of Ar or N-2 gas flow. Single crystalline nanostructures such as nanorods have been successfully achieved with very high yield. To understand the growth phenomena we conducted systematic experiments and found that the optimum growth conditions are associated with the film thickness, temperature anti duration time. Annealing induced stress and decrease in the surface energy might be the driving force for growth of nanorods from the nanofilm in this method. Since surface energy is the most important parameter when crystal size reduced to nanometer scale: in the presence of graphite and carrier gas, sputtered nanofilm turns into nanoislands at higher temperature in order to reduce surface energy and these nanoislands turns into nanorods/nanowires based on the crystal structure of the material. This combination method opens up a new avenue for the fabrication of one-dimensional nanostructures with high yield and better crystallinity.
ACS applied materials & interfaces, Jan 30, 2016
A generic one-pot hydrothermal synthesis route has been successfully designed and utilized to in ... more A generic one-pot hydrothermal synthesis route has been successfully designed and utilized to in situ grow uniform manganese oxide nanorods and nanowires onto the cordierite honeycomb monolithic substrates, forming a series of nanoarray-based monolithic catalysts. During the synthesis process, three types of potassium salt oxidants have been used with different reduction potentials, i.e., K2Cr2O7, KClO3, and K2S2O8, denoted as HM-DCM, HM-PCR, and HM-PSF, respectively. The different reduction potentials of the manganese source (Mn(2+)) and oxidants induced the formation of manganese oxide nanoarrays with different morphology, surface area, and reactivity of carbon monoxide (CO) oxidation. K2Cr2O7 and KClO3 can induce sharp and long nanowires with slow growth rates due to their low reduction potentials. In comparison, the nanoarrays of HM-PSF presented shorter nanorods but displayed an efficient 90% CO oxidation conversion at 200 °C (T90) without noble-metal loading. Reducibility test...
ACS applied materials & interfaces, Jan 13, 2016
Noble metal nanoparticles are extensively used for sensitizing metal oxide chemical sensors throu... more Noble metal nanoparticles are extensively used for sensitizing metal oxide chemical sensors through the catalytic spillover mechanism. However, due to earth-scarcity and high cost of noble metals, finding replacements presents a great economic benefit. Besides, high temperature and harsh environment sensor applications demand material stability under conditions approaching thermal and chemical stability limits of noble metals. In this study, we employed thermally stable perovskite-type La0.8Sr0.2FeO3 (LSFO) nanoparticle surface decoration on Ga2O3 nanorod array gas sensors and discovered an order of magnitude enhanced sensitivity to carbon monoxide at 500 °C. The LSFO nanoparticle catalysts was of comparable performance to that achieved by Pt nanoparticles, with a much lower weight loading than Pt. Detailed electron microscopy and X-ray photoelectron spectroscopy studies suggested the LSFO nanoparticle sensitization effect is attributed to a spillover-like effect associated with the...
YInGe 2 O 7 /xTm samples, with x = 0-7 mol %, exhibit an emission in the blue region with a domin... more YInGe 2 O 7 /xTm samples, with x = 0-7 mol %, exhibit an emission in the blue region with a dominant wavelength of 1 D 2 → 3 F 4 at 453 nm. The energy is absorbed by the Tm 3ϩ ion to the 1 D 2 emitting level, then transferred to a lower state via radiative transition. A single exponential decay behavior was observed for diluted samples, and a nonexponential decay behavior occurred when YInGe 2 O 7 was doped with a higher Tm 3+ ion concentration. The saturation of emission intensity excited by intra-4f transitions occurred at a concentration of x = 0.04, indicating that the concentration quenching is active when x Ͼ 0.04. © 2007 The Electrochemical Society. ͓DOI: 10.1149/1.2732076͔ All rights reserved. Oxide phosphors have recently gained much attention for applications such as screens in plasma display panels and field-emission displays and for white color light-emitting diodes because of their higher chemical stability and resistance to moisture relative to that of sulfide/phosphor...
Journal of Materials Chemistry A
Thermally stable perovskite nanoparticles significantly enhance the NO2 gas sensitivity of β-Ga2O... more Thermally stable perovskite nanoparticles significantly enhance the NO2 gas sensitivity of β-Ga2O3 nanorods at 800 °C. The p–n junction interface plays an important role in improving the gas sensor performance.
Journal of Materials Chemistry A
Copper manganese oxide (CuMn2O4) was introduced into the nanoarray-based monolithic catalysts sys... more Copper manganese oxide (CuMn2O4) was introduced into the nanoarray-based monolithic catalysts system for advanced exhaust after-treatment.
Science of Advanced Materials, 2012
ABSTRACT We have grown ZnO, ZnS, NiO and SiOx nanowires or nanorods using a combination of stress... more ABSTRACT We have grown ZnO, ZnS, NiO and SiOx nanowires or nanorods using a combination of stress induced recrystallization and in-situ carbothermal method in the tubular furnace. In this method, nanofilm of the desired material sputtered on silicon/quartz was kept at a certain distance from the graphite source in the presence of Ar or N-2 gas flow. Single crystalline nanostructures such as nanorods have been successfully achieved with very high yield. To understand the growth phenomena we conducted systematic experiments and found that the optimum growth conditions are associated with the film thickness, temperature anti duration time. Annealing induced stress and decrease in the surface energy might be the driving force for growth of nanorods from the nanofilm in this method. Since surface energy is the most important parameter when crystal size reduced to nanometer scale: in the presence of graphite and carrier gas, sputtered nanofilm turns into nanoislands at higher temperature in order to reduce surface energy and these nanoislands turns into nanorods/nanowires based on the crystal structure of the material. This combination method opens up a new avenue for the fabrication of one-dimensional nanostructures with high yield and better crystallinity.
ACS applied materials & interfaces, Jan 30, 2016
A generic one-pot hydrothermal synthesis route has been successfully designed and utilized to in ... more A generic one-pot hydrothermal synthesis route has been successfully designed and utilized to in situ grow uniform manganese oxide nanorods and nanowires onto the cordierite honeycomb monolithic substrates, forming a series of nanoarray-based monolithic catalysts. During the synthesis process, three types of potassium salt oxidants have been used with different reduction potentials, i.e., K2Cr2O7, KClO3, and K2S2O8, denoted as HM-DCM, HM-PCR, and HM-PSF, respectively. The different reduction potentials of the manganese source (Mn(2+)) and oxidants induced the formation of manganese oxide nanoarrays with different morphology, surface area, and reactivity of carbon monoxide (CO) oxidation. K2Cr2O7 and KClO3 can induce sharp and long nanowires with slow growth rates due to their low reduction potentials. In comparison, the nanoarrays of HM-PSF presented shorter nanorods but displayed an efficient 90% CO oxidation conversion at 200 °C (T90) without noble-metal loading. Reducibility test...
ACS applied materials & interfaces, Jan 13, 2016
Noble metal nanoparticles are extensively used for sensitizing metal oxide chemical sensors throu... more Noble metal nanoparticles are extensively used for sensitizing metal oxide chemical sensors through the catalytic spillover mechanism. However, due to earth-scarcity and high cost of noble metals, finding replacements presents a great economic benefit. Besides, high temperature and harsh environment sensor applications demand material stability under conditions approaching thermal and chemical stability limits of noble metals. In this study, we employed thermally stable perovskite-type La0.8Sr0.2FeO3 (LSFO) nanoparticle surface decoration on Ga2O3 nanorod array gas sensors and discovered an order of magnitude enhanced sensitivity to carbon monoxide at 500 °C. The LSFO nanoparticle catalysts was of comparable performance to that achieved by Pt nanoparticles, with a much lower weight loading than Pt. Detailed electron microscopy and X-ray photoelectron spectroscopy studies suggested the LSFO nanoparticle sensitization effect is attributed to a spillover-like effect associated with the...