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Reuse of sodium–doped iridium oxide nanoparticles as a bio–stimulating electrode by a chemical and electrochemical recovery process

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Ceramics International 2024年第4期50卷 6220-6228页

作者： Tso, Kuang-Chih Chen, Chieh-Hsuan Chen, Po-Chun Li, Shao-Sian Chen, Jeng-Lung Ohta, Jun Wu, Pu-Wei Division of Materials Science Graduate School of Science and Technology Nara Institute of Science and Technology Nara630-0192 Japan Graduate Degree Program of Science and Technology of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu300 Taiwan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei106 Taiwan National Synchrotron Radiation Research Center Hsinchu300 Taiwan

A sequential chlorination and electrochemical reduction process is demonstrated to convert Na–doped iridium oxide nanoparticles into useful IrIIICl63−(aq) serving as the precursor for the fabrication of bio–stimulating electrode. The Na–doped iridium oxide nanoparticles are treated in 35 wt% hydrochloric acid at 70 °C for 18 h to form IrIVCl62−(aq) with pH of 0.3, so the latter could be readily reduced to IrIIICl63−(aq) at a potentiostatic mode of 0.6 V (vs. SCE). The oxidation state and the nature of complexing ligands for the regenerated IrIIICl63− and IrIVCl62−, as well as commercially available IrIIICl63− are validated by X–ray Absorption Spectroscopy. UV–Vis profiles of regenerated IrIVCl62−(aq) are recorded and the absorbance at 487 nm signal is benchmarked against that of standard IrIVCl62−(aq) to obtain the effective regeneration ratio of 68.6%. X–ray diffraction patterns of Na–doped iridium oxide nanoparticles before and after the annealing treatment indicate the amorphous structure facilitates the chlorination step. The regenerated IrIIICl63− is reused to synthesize Na–doped iridium oxide thin film serving as a bio–stimulating electrode for implantable bio–electronics. The regenerated Na–doped iridium oxide thin film reveals a charge-storage capacity of 0.32 mC/cm2-nm and impressive stability that are comparable to those of fresh Na–doped iridium oxide thin film derived from commercially available IrIIICl63−. © 2023 Elsevier Ltd and Techna Group S.r.l.

关键词： Transition metal oxides

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Fabrication of graphene by electrochemical exfoliation in alkaline electrolytes

Fabrication of graphene by electrochemical exfoliation in al...

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作者： Chang, Li-Chung Hsieh, Yu-Chi Chen, Yong-Min Wu, Pu-Wei Lee, Jyh-Fu Graduate Program for Science and Technology of Accelerator Light Source China Department of Materials Science and Engineering National Chiao Tung University Hsin-Chu 30010 Taiwan Taiwan National Synchrotron Radiation Research Center Hsin-Chu 30076 Taiwan Taiwan

ISBN: (纸本)9781607685395

Fabrication of graphene was demonstrated by electrochemical exfoliation of graphite in an ammonium hydroxide solution. The processing parameter of applied voltage was optimized to accomplish graphene productivity and desired chemical composition. Images from the atomic force microscopy showed graphene sheets with lateral sizes of several hundred nanometers. Images from the transmission electron microscopy indicated the existence of stacked graphene sheets with thickness of a few graphene layers. Raman spectroscopy confirmed variation of assynthesized graphene and bulk graphite. X-ray photoemission spectroscopy suggested the formation of graphene oxide at large voltage. © 2014 The Electrochemical Society.

关键词： Graphene

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Analysis of the synchrotron radiation from segmented undulator in double-mini beta function 8

Analysis of the synchrotron radiation from segmented undulat...

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8th International Particle Accelerator Conference, IPAC 2017

作者： Luo, H.W. Chung, T.Y. Hwang, C.S. Lee, C.H. Graduate Program in Science and Technology of Synchrotron Light Source National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Electrophysics National Chiao Tung University Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)9783954501823

Three long straight sections with double-mini beta-y lattice were created in the Taiwan Photon source (TPS) for which the effects of focusing elements and phase shifters between the collinear undulators result in incorrect calculations of the brilliance while assuming a Gaussian-approximation. Therefore, an on-axis Wigner distribution function (WDF), which includes effects of wave phenomena, is a natural way to measure the intensity of synchrotron radiation and is used in this article as the definition of brilliance. © 2017 CC-BY-3.0 and by the respective authors

关键词： synchrotron radiation

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Properties of synchrotron radiation from segmented undulators based on a Wigner distribution function 7

Properties of synchrotron radiation from segmented undulator...

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7th International Particle Accelerator Conference, IPAC 2016

作者： Luo, H.W. Chung, T.Y. Lee, C.H. Hwang, C.S. Graduate Program in Science and Technology of Synchrotron Light Source National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Department of Electrophysics National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9783954501472

Three long straight sections with a double mini-βylattice were designed in Taiwan Photon source. For the purpose to understand whether the brilliance can be enhanced or not when two collinear undulators were installed in the double mini-βysection. The method of Wigner distribution function (WDF) is a natural way to describe a synchrotron radiation source. The brilliance is thereby calculable without a Gaussian approximation used in a conventional manner. Hence the WDF is developed to calculate the brilliance for the two collinear undulators in the double mini-βysection. Some important optical properties such as the degree of coherence can be directly calculated with this method. We use it as an example to investigate the properties of radiation from a segmented undulator. Copyright © 2016 CC-BY-3.0 and by the respective authors.

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X-ray microscopy and spectroscopy insights of organic spin-valve

X-ray microscopy and spectroscopy insights of organic spin-v...

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International Conference on Magnetics (INTERMAG)

作者： D. Wei P. Cheng Graduate Program for Science and Technology of Synchrotron Light Source National Tsing Hua University Hsinchu Taiwan Research Division National Synchrotron Radiation Research Center Hsinchu Taiwan

One recent focus in spintronics is the observation of giant magnetoresistance (GMR) in organic spin-valve (OSV). Sandwiched by two ferromagnetic (FM) layers, organic semiconductor (OSC) was incorporated into the spin-valve structure to take advantage of its low spin-orbit interaction so that the coherence of spin-polarized carriers can be preserved over an extended time. The observation of GMR in OSV is thus a promising result suggesting spins have indeed travelled through OSC. However, until now, the magnetoresistance (MR) ratio given by OSV remains to be relatively low and highly sensitive to temperature. Obviously, our understanding on OSV is far from complete, and there are unidentified effects hindering the transport of spins in OSV. In this report, we present the experimental evidences suggesting that the absence of room temperature GMR in OSV may be related to the diffusion of metal clusters from metallic top electrode into OSC layer. Our findings also offer a plausible explanation on why inserting an oxide layer between OSC and FM electrode can improve the MR ratio of OSV.

关键词： Frequency modulation Electrodes Temperature sensors Metals Magnetic films Magnetic resonance imaging

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Fabrication and ferroelectric properties of BiFeO3/LaNiO 3 artificial superlattice structures grown by radio-frequency magnetron-sputtering

Fabrication and ferroelectric properties of BiFeO3/LaNiO 3 a...

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作者： Liu, Yen-Ting Chiu, Shang-Jui Lee, Hsin-Yi Chen, San-Yuan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Materials Science and Engineering National Chiao Tung University Hsinchu Taiwan

Symmetric superlattice structures of multiferroic BiFeO3 and conductive LaNiO3 sublayers were grown on a Nb-doped SrTiO 3 substrate with radio-frequency magnetron-sputtering. The formation of a superlattice structure was confirmed from the appearance of satellite lines on both sides of the main line in the X-ray diffraction pattern. X-ray measurements show that these superlattice films become subject to greater tensile stress along the c-axis and to increased compressive stress parallel to the surface plane with a decreasing thickness of the sublayer. The smaller is the thickness of the sublayer, the greater is the crystalline quality and the strain state. The hysteresis loops show a large leakage current at frequencies of 0.5 and 1 kHz;the polarization decreases with an increasing frequency. © 2012 Elsevier B.V.

关键词： X ray scattering

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Characteristics of highly orientated BiFeO3 thin films on a LaNiO3-coated Si substrate by RF sputtering

Characteristics of highly orientated BiFeO3 thin films on a ...

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作者： Liu, Yen-Ting Chen, San-Yuan Lee, Hsin-Yi Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 300 Taiwan Department of Materials Science and Engineering National Chiao Tung University Hsinchu 300 Taiwan National Synchrotron Radiation Research Center Hsinchu Science Park 101 Hsin-Ann Road Hsinchu 30076 Taiwan

BiFeO3 (BFO) films were grown on LaNiO3-coated Si substrate by a RF magnetron sputtering system at temperatures in the range of 300-700 °C. X-ray reflectivity and high-resolution diffraction measurements were employed to characterize the microstructure of these films. For a substrate temperature below 300 °C and at 700 °C only partially crystalline films and completely randomly polycrystalline films were grown, whereas highly (001)-orientated BFO film was obtained for a substrate temperature in the range of 400-600 °C. The crystalline quality of BFO thin films increase as the deposition temperature increase except for the film deposited at 700 °C. The fitted result from X-ray reflectivity curves show that the densities of the BFO films are slightly less than their bulk values. For the BFO films deposited at 300-600 °C, the higher the deposition temperature, the larger the remnant polarization and surface roughness of the films present. © 2010 Elsevier B.V. All rights reserved.

关键词： X ray diffraction

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180 °-twisted bilayer ReSe2 as an artificial noncentrosymmetric semiconductor

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Physical Review Research 2024年第2期6卷 L022048-L022048页

作者： S. Akatsuka M. Sakano T. Yamamoto T. Nomoto R. Arita R. Murata T. Sasagawa K. Watanabe T. Taniguchi N. Mitsuishi M. Kitamura K. Horiba K. Sugawara S. Souma T. Sato H. Kumigashira K. Shinokita H. Wang K. Matsuda S. Masubuchi T. Machida K. Ishizaka Quantum-Phase Electronics Center and Department of Applied Physics Research Center for Advanced Science and Technology (CEMS) Wako Saitama 351-0198 Japan Materials and Structures Laboratory Research Center for Electronic and Optical Materials Research Center for Materials Nanoarchitectonics Photon Factory Institute of Materials Structure Science Institute for Advanced Synchrotron Light Source Department of Physics Graduate School of Science and Advanced Institute for Materials Research (WPI-AIMR) Precursory Research for Embryonic Science and Technology (PRESTO) Institute of Multidisciplinary Research for Advanced Materials (IMRAM) Institute of Advanced Energy Institute of Industrial Science

We have fabricated a 180 °-twisted bilayer ReSe2 by stacking two centrosymmetric monolayer ReSe2 flakes in opposite directions, which is expected to cause the loss of spatial inversion symmetry. We successfully observed spatial inversion-symmetry breaking, in contrast to the monolayer and natural bilayer ReSe2 by the second harmonic generation. ARPES measurements further revealed emergent band dispersions in the 180 °-twisted bilayer ReSe2, distinct from those of the monolayer ReSe2 used in its fabrication. The band calculation shows the finite lifting of spin degeneracy (∼50 meV) distinct from natural monolayer and bilayer ReSe2, which demonstrates that the spin-momentum locked state leading to Berry curvature related phenomena can be realized even with the stacking of centrosymmetric monolayers.

关键词： Electronic structure First-principles calculations Spin-orbit coupling 2-dimensional systems Nanotechnology Transition metal dichalcogenides High-harmonic generation Photoemission spectroscopy

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Depth Dependence of the Photoelectron Emission Profile for Cathode Lens Microscopy

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Microscopy and Microanalysis 2018年第S2期24卷 154-155页

作者： Huang, Yen Chuang, Tzu-Hung Lu, Chun-I Huang, Chih-Heng Lin, Deng-Sung Kuo, Chien-Chen Wei, Der-Hsin Graduate Program of Science and Technology of Synchrotron Light Source National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Program of Synchrotron Radiation and Neutron Beam Applications National Sun Yat-sen University Kaohsiung Taiwan Department of Physics National Tsing Hua University Hsinchu Taiwan

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Preparation of carbon nanotube ink via organic hydrazine treatment

Preparation of carbon nanotube ink via organic hydrazine tre...

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International Microsystems, Packaging, Assembly and Circuits technology (IMPACT)

作者： Li-Hung Liu Jhih-Syuan Teng Yao-Jane Hsu Pen-Cheng Wang Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Graduate Program for Science and Technology of Synchrotron Light Source National Tsing Hua University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan

ISBN: (纸本)9781479977284

In this study, we used four different hydrazines to react with CNTs to prepare CNT-based inks. We found that the ink with CNTs subjected to the 2,4-dinitrophenylhydrazine treatment exhibited much better dispersion property than the inks with CNTs treated with other organic hydrazines. In other words, within 3 days, all ink dispersions began to bundle and precipitate after the sample vials were left on the bench top in our lab, except the sample with CNTs treated with 2,4-dinitrophenylhydrazine. Most importantly, the ink sample with CNTs treated with 2,4-dinitrophenylhydrazine were still well dispersed even after the sample vial was left on the bench top for 6 months.

关键词： Carbon nanotubes Ink Dispersion Chemicals Surface treatment Films

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