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Shigehito Deki - One of the best experts on this subject based on the ideXlab platform.
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Room-temperature Synthesis of Monodispersed SnO2 Nanoparticles by Liquid Phase Deposition
Chemistry Letters, 2009Co-Authors: Minoru Mizuhata, Yuki Umekage, Akiyoshi Nakata, R. Kumaresan, Shigehito DekiAbstract:We have successfully tailored a soft solution process for the synthesis of monodispersed Sn0 2 nanoparticles, applying a Liquid Phase Deposition technique from an aqueous reaction mixture without any post-annealing treatment. The synthesis was carried out by varying poly(ethylene glycol) (PEG) content in the reaction mixture. The XRD patterns of the nanoparticles exhibited the formation of Sn0 2 cassiterite Phase, irrespective of the PEG content in the composition of the reaction solution, the reaction time, and the reaction temperature. The mean size and the standard deviation of Sn0 2 nanoparticles exhibited a decreasing trend with increasing PEG concentration.
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Preparation of α-nickel hydroxide/carbon composite by the Liquid Phase Deposition method
Journal of the Ceramic Society of Japan, 2009Co-Authors: Alexis Bienvenu Béléké, Minoru Mizuhata, Akinobu Hosokawa, Shigehito DekiAbstract:High purity α-nickel hydroxide/carbon composite has been synthesized by the Liquid Phase Deposition (LPD) method. The purity of the as-prepared samples was confirmed by X-ray photon electron (XPS) survey spectra, which showed no other peak than that of the core levels Ni 2p, O 1s, C1s, Ni 3s and Ni 3p involved in the process. Scanning electron microscope (SEM) images showed carbon particles randomly embedded within the Ni(OH)2 network. The amount of deposited nickel hydroxide can be controlled by the ratio between carbon and the quantity of the treatment solution, and the reaction time.
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protein templated organic inorganic hybrid materials prepared by Liquid Phase Deposition
Journal of the American Chemical Society, 2007Co-Authors: Mayuko Tatemichi, Shigehito Deki, Mune-aki Sakamoto, Minoru Mizuhata, Toshifumi TakeuchiAbstract:Organic/inorganic hybrid thin films for protein recognition have been prepared by the Liquid-Phase Deposition (LPD) coupled with template synthesis, i.e., molecular imprinting, where pepsin (Pep) was used as a model protein and titanium oxide was deposited on gold substrates in the presence of Pep-poly-l-lysine (PL) complexes. The complexes remained in the templated film after the Deposition, and the binding sites for Pep were constructured after Pep was removed from the film. Surface plasmon resonance signals on the deposited films were measured to examine the binding behaviors toward proteins. The binding of Pep on the templated film was reversible, and the binding isotherm of Pep depicted a saturation curve with a binding constant of 7.3 × 105 M-1, which was 10 times higher than that of albumin. In contrast, titanium oxide films prepared without PL did not show any selectivity; therefore, the hybridization of PL as the organic binder with the inorganic material is necessary to obtain selective binding ...
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Fabrication of Copper Ferrite Thin Films from Aqueous Solution by the Liquid-Phase Deposition Method
Chemistry Letters, 2007Co-Authors: Shigehito Deki, Hidenori Miki, Mune-aki Sakamoto, Minoru MizuhataAbstract:Liquid-Phase Deposition, LPD, method was used for the fabrication of copper ferrite (CuFe2O4) thin film from aqueous solution system of FeOOH–NH4·HF (aq.) and Cu source (Cu(NO3)2 or CuCl2) with H3B...
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Synthesis of nanostructured metal oxide by Liquid-Phase Deposition
Electrochimica Acta, 2007Co-Authors: Yoshifumi Aoi, Hisae Kambayashi, Tomoe Deguchi, Kohsuke Yato, Shigehito DekiAbstract:Abstract We synthesized hollow magnetite particles by Liquid-Phase Deposition (LPD) using polystyrene (PS) particles as templates. We prepared β-FeOOH/PS composite particles by adding boric acid to an aqueous FeOOH/NH 4 F·HF solution. PS particles were used as templates. Calcination of the composite particles under vacuum produced hollow magnetite (Fe 3 O 4 ) particles that were readily attracted to a magnetic field.
Ming Kwei Lee - One of the best experts on this subject based on the ideXlab platform.
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High dielectric constant nickel-doped titanium oxide films prepared by Liquid-Phase Deposition
Applied Physics A, 2014Co-Authors: Ming Kwei Lee, Chih-feng Yen, Cho-han FanAbstract:The electrical characteristics of nickel-doped titanium oxide films prepared by Liquid-Phase Deposition on p-type (100) silicon substrate were investigated. The aqueous solutions of ammonium hexafluorotitanate and boric acid were used as precursors for the growth of titanium oxide films and the dielectric constant is 29. The dielectric constant can be improved to 94 by nickel doping at the thermal annealing at 700 °C in nitrous oxide.
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Characterization of transparent conducting p-type nickel oxide films grown by Liquid Phase Deposition on glass
Journal of Physics D: Applied Physics, 2013Co-Authors: Ming Kwei Lee, Yen-ting LaiAbstract:Transparent conducting nickel oxide (NiO) films were prepared by Liquid Phase Deposition on glass. Saturated NiF2 and boric acid solutions were used as precursors. There was a growth delay time of 5 h and the growth rate was 34.3 nm per hour in the growth region. After annealing at 400 °C in air, the resistivity was improved from 4.85 × 103 Ω cm to 7.5 × 10−1 Ω cm, and the transmittance decreased from 91.85% to 66.49% at a wavelength of 550 nm, respectively.
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Electrical Characteristics of Strontium Titanate Films Prepared by Liquid Phase Deposition
Japanese Journal of Applied Physics, 2007Co-Authors: Ming Kwei Lee, Hung-chang Lee, Zhen-hui LeeAbstract:In this study, strontium titanate precursor was prepared by Liquid Phase Deposition with aqueous solutions of ammonium hexafluoro-titanate, strontium nitrate and boric acid. Its polycrystalline structure shows high leakage current density and low dielectric constant. After thermal annealing in O2 ambient, the strontium titanate precursor is transformed gradually into strontium titanate film, as determined by X-ray diffraction (XRD). The leakage current and dielectric constant are improved. In order to further improve the leakage current, a thermal ultrathin SiO2 layer is added between strontium titanate and silicon. The leakage current density can be improved to 2.23×10-4 A/cm2 at 0.38 MV/cm and the dielectric constant is 39.
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Characterization of Thermally Annealed Fluorinated Silicon Dioxide Films Prepared by Liquid-Phase Deposition
Japanese Journal of Applied Physics, 2005Co-Authors: Ming Kwei Lee, Chung-min Shih, Shu-ming Chang, Hong-chi Wang, Jungjie HuangAbstract:Fluorinated silicon dioxide films were prepared by Liquid Phase Deposition method using hydrosilicofluoric acid and ammonium hydroxide aqua as sources. The quality of fluorinated silicon dioxide films can be improved by N2 thermal annealing. It is in an attempt to evaluate the feasibility of this material as a candidate for inter-metal dielectrics in ULSIs. The obtained results were the relative dielectric constant of 3.2, and the leakage current density measured at the electric field of 1.5 MV/cm about 1×10-7 A/cm2 at the annealing temperature of 350°C. It has potential for inter-metal dielectric applications.
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Selective and blanket Liquid Phase Deposition of silicon dioxide on silicon nitride and tungsten silicide
Semiconductor Science and Technology, 2003Co-Authors: Ming Kwei Lee, Chung-min Shih, Chi-da YangAbstract:In the conventional process of Liquid Phase Deposition, silicon dioxide cannot be deposited on silicon nitride and tungsten silicide substrates. In the present study, this limitation is removed by adding aqueous ammonia to the hydrofluorosilicic acid source. A selective or blanket Deposition can be controlled. The Deposition rate is also enhanced.
Jungjie Huang - One of the best experts on this subject based on the ideXlab platform.
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Antireflection and passivation property of titanium oxide thin film on silicon nanowire by Liquid Phase Deposition
Surface and Coatings Technology, 2017Co-Authors: Jungjie Huang, Chechun Lin, Dongsing WuuAbstract:Abstract To improve a high-efficiency silicon nanowires solar cell, using the antireflection coatings and surface passivation technique were very important. In this investigation, titanium oxide antireflection coatings were deposited on silicon nanowires by using Liquid Phase Deposition. The Deposition solution of (NH4)2TiF6 and H3BO3 were used for titanium oxide Deposition. The concentration of the H3BO3 in the Deposition solution play important roles in the formation of Ti–Si1 − xOy interface layer between the titanium oxide/silicon nanowires interface and to control the trace amount of hydrofluoric acid in the solution. The titanium oxide films modification decreases and increases the reflectance and effective minority carrier lifetime of the silicon nanowires arrays. Under the optimal condition, the reflectance and effective minority carrier lifetime of Liquid Phase deposited titanium oxide film were 3.6% and 1.29 μs, respectively. The titanium oxide films were used herein to fabricate antireflection coating and passivation film to ensure low cost, good uniformity, favorable adhesion, mass producibility, and the formation of large-area thin film; thus, the Liquid Phase Deposition-antireflection coating film was highly favorable for silicon-based solar cells.
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properties of double layer al2o3 tio2 antireflection coatings by Liquid Phase Deposition
Thin Solid Films, 2015Co-Authors: Dongsing Wuu, Chechun Lin, Chaonan Chen, Honghsiu Lee, Jungjie HuangAbstract:Abstract In this investigation, Al 2 O 3 /TiO 2 double-layer antireflection coatings were deposited on polished silicon substrate by using Liquid Phase Deposition. The Deposition solution of ammonium hexafluoro-titanate and boric acid was used for TiO 2 Deposition. Aluminum sulfate and sodium bicarbonate were used for Al 2 O 3 Deposition. The concentration of the sodium bicarbonate and boric acid in the Deposition solution controls the rate of Deposition of Al 2 O 3 and TiO 2 films. Under optimal conditions, the average refractive index of Liquid Phase deposited Al 2 O 3 and Liquid Phase deposited TiO 2 films was 1.58 and 1.76, respectively. The average reflectance was 3.3% at wavelengths from 400 to 800 nm for Liquid Phase deposited Al 2 O 3 and Liquid Phase deposited TiO 2 film thicknesses of 99 and 89 nm, respectively. This antireflective property was comparable to other vacuum Deposition methods, such as plasma-enhanced chemical vapor Deposition and sputtering; thus, the Liquid Phase Deposition of antireflection coatings was highly favorable for silicon-based solar cells.
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Properties of double-layer Al2O3/TiO2 antireflection coatings by Liquid Phase Deposition
Thin Solid Films, 2015Co-Authors: Dongsing Wuu, Chechun Lin, Chaonan Chen, Honghsiu Lee, Jungjie HuangAbstract:Abstract In this investigation, Al 2 O 3 /TiO 2 double-layer antireflection coatings were deposited on polished silicon substrate by using Liquid Phase Deposition. The Deposition solution of ammonium hexafluoro-titanate and boric acid was used for TiO 2 Deposition. Aluminum sulfate and sodium bicarbonate were used for Al 2 O 3 Deposition. The concentration of the sodium bicarbonate and boric acid in the Deposition solution controls the rate of Deposition of Al 2 O 3 and TiO 2 films. Under optimal conditions, the average refractive index of Liquid Phase deposited Al 2 O 3 and Liquid Phase deposited TiO 2 films was 1.58 and 1.76, respectively. The average reflectance was 3.3% at wavelengths from 400 to 800 nm for Liquid Phase deposited Al 2 O 3 and Liquid Phase deposited TiO 2 film thicknesses of 99 and 89 nm, respectively. This antireflective property was comparable to other vacuum Deposition methods, such as plasma-enhanced chemical vapor Deposition and sputtering; thus, the Liquid Phase Deposition of antireflection coatings was highly favorable for silicon-based solar cells.
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Self-cleaning and antireflection properties of titanium oxide film by Liquid Phase Deposition
Surface and Coatings Technology, 2013Co-Authors: Jungjie Huang, Yu-tsu LeeAbstract:Abstract In this investigation, titanium oxide films were deposited on silicon substrate by Liquid Phase Deposition using a Deposition solution of ammonium hexafluoro-titanate and boric acid. The concentration of the boric acid in the Deposition solution controls the rate of Deposition of titanium oxide film. The titanium oxide film becomes superhydrophilic with a contact angle around 4° after irradiation by UV light. The average reflectance is 5.3% at wavelengths from 400 to 800 nm. Superior wetting and antireflection properties make the film suitable for use in silicon-based solar cells.
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Characterization of Thermally Annealed Fluorinated Silicon Dioxide Films Prepared by Liquid-Phase Deposition
Japanese Journal of Applied Physics, 2005Co-Authors: Ming Kwei Lee, Chung-min Shih, Shu-ming Chang, Hong-chi Wang, Jungjie HuangAbstract:Fluorinated silicon dioxide films were prepared by Liquid Phase Deposition method using hydrosilicofluoric acid and ammonium hydroxide aqua as sources. The quality of fluorinated silicon dioxide films can be improved by N2 thermal annealing. It is in an attempt to evaluate the feasibility of this material as a candidate for inter-metal dielectrics in ULSIs. The obtained results were the relative dielectric constant of 3.2, and the leakage current density measured at the electric field of 1.5 MV/cm about 1×10-7 A/cm2 at the annealing temperature of 350°C. It has potential for inter-metal dielectric applications.
Mandu Inyang - One of the best experts on this subject based on the ideXlab platform.
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phosphate removal ability of biochar mgal ldh ultra fine composites prepared by Liquid Phase Deposition
Chemosphere, 2013Co-Authors: Ming Zhang, Bin Gao, Ying Yao, Mandu InyangAbstract:Morphological structures and adsorption properties of biochar/MgAl-LDH ultra-fine composites prepared by Liquid-Phase Deposition have been determined in laboratory. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), and Fourier transform infrared (FTIR) were used to characterize the biochar based ultra-composites. The XRD and FTIR data indicated that the biochar/MgAl-LDHs ultra-fine composites can successfully be obtained by Liquid-Phase Deposition. The SEM images showed the dispersion of colloidal and nanosized LDH flakes on the carbon surfaces within the biochar matrix. The thickness and size of single LDH platelet are 20-40 nm and 100-300 nm. Batch sorption experiments were also conducted and the results indicated that the biochar/MgAl-LDHs ultra-fine composites is an effective sorbent for the removal of phosphate from aqueous solutions.
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Phosphate removal ability of biochar/MgAl-LDH ultra-fine composites prepared by Liquid-Phase Deposition
Chemosphere, 2013Co-Authors: Ming Zhang, Bin Gao, Ying Yao, Mandu InyangAbstract:Morphological structures and adsorption properties of biochar/MgAl-LDH ultra-fine composites prepared by Liquid-Phase Deposition have been determined in laboratory. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), and Fourier transform infrared (FTIR) were used to characterize the biochar based ultra-composites. The XRD and FTIR data indicated that the biochar/MgAl-LDHs ultra-fine composites can successfully be obtained by Liquid-Phase Deposition. The SEM images showed the dispersion of colloidal and nanosized LDH flakes on the carbon surfaces within the biochar matrix. The thickness and size of single LDH platelet are 20-40 nm and 100-300 nm. Batch sorption experiments were also conducted and the results indicated that the biochar/MgAl-LDHs ultra-fine composites is an effective sorbent for the removal of phosphate from aqueous solutions.
Amin Yourdkhani - One of the best experts on this subject based on the ideXlab platform.
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Liquid Phase Deposition of iron phosphate thin films
CrystEngComm, 2018Co-Authors: Ehsan Mahboubi, Amin Yourdkhani, Reza PoursalehiAbstract:Liquid Phase Deposition (LPD) has been applied for the synthesis of iron phosphate thin films as an example of an effective methodology for the thin film growth of other polyanionic compounds. The prepared films were highly uniform, free of cracks, pure and successfully applied to cover various substrates such as soda-lime glass and stainless steel. The thickness of these films can be easily tailored in the range of 80 nm to 2.7 μm by the Deposition time. The chemical equilibria for the hydrolysis of [PF6]− species and the formation of iron phosphate were studied by 19F-NMR and 31P-NMR spectroscopy to get insight into the formation mechanism of iron phosphate thin films. Hydrolysis of [PF6]− occurs very slowly and a longer induction period favors the hydrolysis. The as-prepared FePO4·2H2O films on conductive stainless steel substrates are shown to be electrochemically active for the intercalation of Li+ ions. Two polymorphs of FePO4 with crystal structures identical to hexagonal tridymite AlPO4 and monoclinic FeAsO4 were identified upon heat treatment of the as-prepared powders.
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Liquid Phase Deposition of Barium Hexaferrite Thin Films
The Journal of Physical Chemistry C, 2014Co-Authors: Amin Yourdkhani, Daniela Caruntu, Armando K. Perez, Gabriel CaruntuAbstract:In this study we demonstrate for the first time that magnetic films with a complex crystal structure, such as hexagonal barium ferrite BaFe12O19, can be successfully fabricated in aqueous solutions at 60 °C by the Liquid Phase Deposition method (LPD). Highly uniform films with a variable thickness were deposited on (001) Si substrates at 60 °C and analyzed by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and magnetic force microscopy. As expected, the as-deposited films are amorphous and consist of a mixture of metal oxide/oxyhydroxide intermediates which can be converted into the desired hexagonal barium ferrite Phase upon heat treatment at 950 °C in air. The molar ratio of the metal cations in the treatment solution was found to play a crucial role on the composition of the films, with chemically pure BaFe12O19 films forming in solution when the Fe3+/Ba2+ molar ratio is n = 11. The films are constructed by close-packed spheroidal particles and have out-of-plane coercive fields whi...
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Magnetoelectric Perovskite-Spinel Bilayered Nanocomposites Synthesized by Liquid-Phase Deposition
Chemistry of Materials, 2010Co-Authors: Amin Yourdkhani, Armando K. Perez, Cuikun Lin, Gabriel CaruntuAbstract:Highly uniform bilayered perovskite-spinel hybrid nanostructures were deposited on glass and LaNiO3-buffered (100) silicon substrates at almost-ambient temperatures via the Liquid-Phase Deposition (LPD) method. Field-emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM) evidenced that the perovskite and spinel layers are constructed by arrays of densely packed nanoparticles with uniform sizes. The bilayered nanocomposites exhibit both piezoelectricity and ferrimagnetism at room temperature. The value of the static piezoelectric coefficient of the PbTiO3 (PTO) film was 14.1 pm/V, whereas the values of the saturation magnetization were 234.4 and 223.2 emu/cm3 for the PbTiO3−Co0.32Fe2.68O4 (CFO) and PbTiO3−Ni0.66Fe2.34O4 (NFO), respectively. The coercivity of the nanocomposite decreased by 12.11% for the PTO−CFO, whereas, for the PTO−NFO, it increased by 20%, with respect to the coercivity values of the pristine ferrite films, which is the result of a magnetoelectric coupling betwe...