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Preparation of Bi<sub>2</sub>Gd<sub>1</sub>Fe<sub>5</sub>O<sub>12</sub> magnetic garnet films showing Faraday rotation of 36.3 deg./μm on glass substrates by metal organic decomposition method
摘要： We fabricated the Bi2Gd1Fe5O12 thin films on glass substrates with the Gd3Fe5O12 buffer layer by the metal organic decomposition (MOD) method. We found an optimum thickness of the Gd3Fe5O12 buffer layer and annealing temperature for crystallization giving the maximum Faraday rotation. The optimum sample showed Faraday rotation of as high as 36.3 deg./μm at the wavelength λ = 500 nm, which is 23 times larger than the sample without the Gd3Fe5O12 buffer layer, and as high as 90.1% of the single crystalline Bi2Gd1Fe5O12 thin films on an (111) SGGG single crystal substrate. These results are promising for applications in optical waveguide isolators and magneto-optic spatial light modulators.
关键词： metal organic decomposition,crystallization process,Faraday rotation,photonic integrated circuits,magnetic garnet
更新于2025-09-23 15:23:52
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Aging of a Vanadium Precursor Solution: Influencing Material Properties and Photoelectrochemical Water Oxidation Performance of Solution-Processed BiVO <sub/>4</sub> Photoanodes
摘要： Metal–organic decomposition is an easy way to fabricate BiVO4 (BVO) photoanodes; however, it often experiences a reproducibility issue. Here, the aging duration of a vanadium precursor solution, vanadyl acetylacetonate in methanol, is identified as a factor that profoundly affects reproducibility. Substantial changes in structural, optical, and electrical properties of BVO films are observed upon varying aging time of vanadium precursor solutions, which subsequently impacts photoelectrochemical (PEC) water oxidation and sulfite oxidation reactions. With the optimum number of aging days (3 d), some deficiency of oxygen is observed, which is accompanied by an increase in carrier concentration and a reduced charge transfer resistance in the PEC device, which produces the highest PEC performance that is comparable to the state-of-the-art undoped BVO photoanodes. The findings point to the importance of understanding solution chemistry and demonstrate that utilization of the understanding of fine adjustment of the composition of BVO films can produce highly reproducible and efficient BiVO4 photoanodes.
关键词： solution aging,metal–organic decomposition,bismuth vanadate,chemical composition,photoelectrochemical water splitting
更新于2025-09-23 15:23:52
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20.1: <i>Invited Paper:</i> Monolithic Full‐color Quantum Dot Nanoring Micro LEDs with Improved Efficiency
摘要： BiMeO3 (where Me denotes a transition metal) is often used as a chemical modifier to form the Bi0.5Na0.5TiO3‐based solid solutions and to improve the electromechanical properties of the materials. In this study, BiMnO3 was selected as a chemical modifier, and (1 ? x)(0.94Bi0.5Na0.5TiO3‐0.06BaTiO3)–xBiMnO3 thin films with x = 0, 0.005, 0.01, and 0.015 were fabricated using the metal organic decomposition method to study the contributions of the third end‐member BiMnO3 to the reduction in the leakage current and the enhancement of the piezoelectric properties of Bi0.5Na0.5TiO3‐BaTiO3 thin films. Thin films with 1 mol% BiMnO3 exhibit a lower leakage current, and a better piezoelectricity and ferroelectricity, whose Smax/Emax, Pmax, 2Ec, and εr are 100.4 pm/V, 48.0 μC/cm2, 54.9 kV/cm, and 942, respectively.
关键词： metal organic decomposition,piezoelectricity,BNT–BKT–BMO thin films,leakage current
更新于2025-09-19 17:13:59
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Understanding the Importance of Cu(I) Intermediates in Self-Reducing Molecular Inks for Flexible Electronics
摘要： Fast and scalable low-temperature deposition of microscale metallic features is of utmost importance for the development of future flexible smart applications including sensors, wireless communication, and wearables. Recently, a new class of metal?organic decomposition (MOD) copper inks was developed, consisting of formate containing amine complexes. From these novel inks, features with outstanding electrical conductivity (±105 S cm?1) are deposited at a temperature of 150 °C or less, which is well below the reduction temperature of orthorhombic α-copper formate (around 225 °C). However, the underlying principle of this reaction mechanism and the relationship between the corresponding temperature shift and the amine coordination are still under debate. The current study provides a full explanation for the shift in reduction temperatures via in situ characterization. The results clearly indicate that the structural resemblance and stability of the Cu(II) starting compound and the occurring Cu(I) intermediate during the in situ reduction are the two main variables that rationalize the temperature shift. As such, the thermal compatibility of copper MOD inks with conventional plastic substrates such as polyethylene terephthalate can be explained, based on metal?organic complex properties.
关键词： metal?organic decomposition,copper inks,in situ characterization,self-reducing,flexible electronics
更新于2025-09-09 09:28:46