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- 주제어 : Lanthanide ions (검색결과 21 건)
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Youngku Sohn 한국진공학회(ASCT) 2019 Applied Science and Convergence Technology Vol.28 No.3
The introduction of guest metal ions significantly change the nature of bare support materials. In this study lanthanide, Ln, (La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) ions were loaded into a cubic phase CeO₂ support by a hydrothermal method. Their fundamental characteristics were examined by scanning electron microscopy, transmission electron microscopy, optical microscopy, X-ray diffraction crystallography, and Raman spectroscopy. Their CO oxidation performances temperature were measured by temperature-programmed reaction mass spectrometry. It was found that the fundamental natures of the Ln-loaded catalysts were all dependent on the ionic radii of guest lanthanide metal ions. Higher CO oxidation activities were obtained for lanthanide metal ions with ionic radii closer to that of the host Ce<SUP>4+</SUP> ion. The present results highlight that defects, particles sizes and surface active sites were affected from the matching of the host and guest-guest ionic radii.
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손영구 한국진공학회 2019 Applied Science and Convergence Technology Vol.28 No.3
The introduction of guest metal ions significantly change the nature of bare support materials. In this study lanthanide, Ln, (La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) ions were loaded into a cubic phase CeO2 support by a hydrothermal method. Their fundamental characteristics were examined by scanning electron microscopy, transmission electron microscopy, optical microscopy, X-ray diffraction crystallography, and Raman spectroscopy. Their CO oxidation performances temperature were measured by temperature-programmed reaction mass spectrometry. It was found that the fundamental natures of the Ln-loaded catalysts were all dependent on the ionic radii of guest lanthanide metal ions. Higher CO oxidation activities were obtained for lanthanide metal ions with ionic radii closer to that of the host Ce4+ ion. The present results highlight that defects, particles sizes and surface active sites were affected from the matching of the host and guest-guest ionic radii.
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Structural stability and electrical characteristic of DNA lattices doped with lanthanide ions
Dugasani, S.R.,Gnapareddy, B.,Kim, J.A.,Yoo, S.,Hwang, T.,Kim, T.,Park, S.H. ELSEVIER 2017 Current Applied Physics Vol.17 No.11
<P>The main aim of doping DNA lattices with lanthanide ions (Ln-DNA complex) is to change the physical functionalities for specific target applications such as electronics and biophotonics. Ln-DNA complexes based on a double-crossover DNA building block were fabricated on glass using a substrate-assisted growth method. We demonstrated the structural stability of Ln-DNA complexes as a function of Ln ion concentration by the atomic force microscopy. The Ln ion doping in DNA lattices was examined using a chemical reduction process, and the electrical characteristics of Ln-DNA complexes were tested using a semiconductor parameter analyzer. The structural phase transition of DNA lattices from the crystalline to amorphous phases occurred at a certain critical concentration of each Ln ion. Ln ions in DNA lattices are known to be intercalated between the base pairs and bound with phosphate backbones. When DNA lattices are properly doped with Ln ions, Ln-DNA complexes revealed the complete deformation with chemical reduction process by ascorbic acid. The current increased up to a critical Ln ion concentration and then decreased with further increasing Ln ions. Ln-DNA complexes will be useful in electronics and photonics because of their unique physical characteristics. (C) 2017 Elsevier B.V. All rights reserved.</P>
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Structural stability and electrical characteristic of DNA lattices doped with lanthanide ions
레디,GNAPAREDDYBRAMARAMBA,김장아,유상현,황태현,김태성,박성하 한국물리학회 2017 Current Applied Physics Vol.17 No.11
The main aim of doping DNA lattices with lanthanide ions (Ln-DNA complex) is to change the physical functionalities for specific target applications such as electronics and biophotonics. LneDNA complexes based on a double-crossover DNA building block were fabricated on glass using a substrate-assisted growth method. We demonstrated the structural stability of LneDNA complexes as a function of Ln ion concentration by the atomic force microscopy. The Ln ion doping in DNA lattices was examined using a chemical reduction process, and the electrical characteristics of LneDNA complexes were tested using a semiconductor parameter analyzer. The structural phase transition of DNA lattices from the crystalline to amorphous phases occurred at a certain critical concentration of each Ln ion. Ln ions in DNA lattices are known to be intercalated between the base pairs and bound with phosphate backbones. When DNA lattices are properly doped with Ln ions, LneDNA complexes revealed the complete deformation with chemical reduction process by ascorbic acid. The current increased up to a critical Ln ion concentration and then decreased with further increasing Ln ions. LneDNA complexes will be useful in electronics and photonics because of their unique physical characteristics.
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Kesama, Mallikarjuna Reddy,Dugasani, Sreekantha Reddy,Yoo, Sanghyun,Chopade, Prathamesh,Gnapareddy, Bramaramba,Park, Sung Ha American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.22
<P>Double and triple lanthanide ion (Ln(3+))-doped synthetic double crossover (DX) DNA lattices and natural salmon DNA (SDNA) thin films are fabricated by the substrate assisted growth and drop-casting methods on given substrates. We employed three combinations of double Ln(3+)-dopant pairs (Tb3+-Tm3+, Tb3+-Eu3+, and Tm3+-Eu3+) and a triple Ln3+-dopant pair (Tb3+-Tm3+-Eu3+) with different types of Ln3+, (i.e., Tb3+ chosen for green emission, Tm3+ for blue, and Eu3+ for red), as well as various concentrations of Ln(3+) for enhancement of specific functionalities. We estimate the optimum concentration of Ln(3+) ([Ln3+]O) wherein the phase transition of Ln(3+)-doped DX DNA lattices occurs from crystalline to amorphous. The phase change of DX DNA lattices at [Ln(3+)]O and a phase diagram controlled by combinations of [Ln(3+)] were verified by atomic force microscope measurement. We also developed a theoretical method to obtain a phase diagram by identifying a simple relationship between [Ln(3+)] and [Ln(3+)]O that in practice was found to be in agreement with experimental results. Finally, we address significance of physical characteristics-current for evaluating [Ln(3+)]O, absorption for understanding the modes of Ln(3+) binding, and photoluminescence for studying energy transfer mechanisms-of double and triple Ln(3+)-doped SDNA thin films. Current and photoluminescence in the visible region increased as the varying [Ln(3+)] increased up to a certain [Ln(3+)]O, then decreased with further increases in [Ln(3+)]. In contrast, the absorbance peak intensity at 260 nm showed the opposite trend, as compared with current and photoluminescence behaviors as a function of varying [Ln(3+)]. A DNA thin film with varying combinations of [Ln(3+)] might provide immense potential for the development of efficient devices or sensors with increasingly complex functionality.</P>
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Chiral Supramolecular Gels with Lanthanide Ions: Correlation between Luminescence and Helical Pitch
Kim, Chaelin,Kim, Ka Young,Lee, Ji Ha,Ahn, Junho,Sakurai, Kazuo,Lee, Shim Sung,Jung, Jong Hwa American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.4
<P>We report the correlation between the fluorescence intensity and the helical pitch of supramolecular hydrogels with Tb(III) and Eu(III) as well as their inkjet printing patterning as an application. The luminescent gels, which exhibited three different emissions of red, green, and blue, could be prepared without and with Eu(III) and Tb(III). The luminescence intensity of supramolecular gels (gel-Tb and gel-Eu) composed of Tb(III) and Eu(III) was ca. 3-fold larger than that of the sol (1+Tb(III) or 1+Eu(III)), which was attributed to large tilting angles between molecules. By AFM observations, these gels showed well-defined right-handed helical nanofibers formed by coordination bonds in which the helical pitch lengths were strongly dependent on the concentrations of lanthanide ions. In particular, the large luminescence intensity of gel-Tb exhibited a smaller helical pitch length than that of gel-1 due to relatively weak pi-pi stacking with large tilting angles between molecules. The luminescence intensities were enhanced linearly with increasing concentrations of lanthanide ions. This is the first example of the correlation between the helical pitch length and the luminescence intensity of supramolecular materials. The coordination bonding in supramolecular hydrogels had a strong influence on rheological properties. We also developed a water-compatible inkjet printing system to generate luminescent supramolecular gels on A4-sized paper. The images of a logo and the text were composed of three different emissions and were well-printed on A4-sized paper coated with gel-1.</P>
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Xingfang Xiao,Lipei Ren,Shujun Wang,Qian Zhang,Yawei Zhang,Ruina Liu,Weilin Xu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.9
Luminescent lanthanide metal-organic frameworks (ln-MOFs) is a promising materials for sensing. However,seeking ideal method to scale up in mass production and can be uniform on flexible substrate is still a great challenge. In thisstudy, a novel and efficient process was employed for the fabrication of flexible and environmental copper ion-sensingmaterials using cotton fabric as a substrate. The micro-nanoscale Europium metal-organic frameworks (Eu-MOFs) wasprepared through adding blocking reagent, and then cotton fabric was coated with the Eu-MOFs by hot pressing. The resultsshow that controllable dense micro-nanoscale Eu-MOFs film was coated on the cotton fabric with different dipping and hotpressing times. The method is fast, simple, low-cost and suitable for production. The Eu-MOFs coated cotton fabric exhibitsgood photoluminescent properties. The selective sensing ability of Eu-MOFs coated fabric for Cu2+ over many other metalions (K+, Cd2+, Ca2+, Pb2+, Na+, Zn2+, Ni2+, Mg2+, Al3+ and Co2+) is verified by emission spectra, and by the fact that thefluorescence intensity of the fabric significantly decreased with an increase in the concentration of Cu2+ (10-6-10-1 mol/L). This method provides a new path for the controllable production of MOFs-coated functional textiles for differentapplications, such as anti-counterfeiting, UV-protection, superhydrophobic, and sensing materials in the textile industry.
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Shuo Kang,Zhikui Yu,Qirong Tian,Minghui Tai,Jiaoying Wang,Dalai Jin,Longcheng Wang 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.6
In this work, YBO3phosphors doped with Ln3+(Ce3+, Tb3+,Eu3+)ions were synthesized by a facile hydrothermal methodusing high temperature and high pressure environment. Structural property characterizations show all the samples have asimilar spherical morphology and a hexagonal crystal structure with good crystallinity. PL spectra and CIE calculation showthat the color of phosphors can be easily controlled by the species and atomic content of Ln3+ions. White color is achievedas the atomic contents of Ln3+ions are: 1% Ce3+,3% Tb3+,and 0.5% Eu3+,respectively. Furthermore, LED devices basedon ultraviolet chip were fabricated and characterized, and the results clearly demonstrated the tunable color of as-preparedphosphors. At the same time, co-doping Ce3+,Tb3+,and Eu3+ions can well adjust the fluorescence lifetime of the threerare earth ions through energy transfer. These results show that the phosphor has broad application prospects in the field ofdisplay lighting such as LED.
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