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A robust bendable IrO_x thin film via mild alkaline solution process for neuron stimulating electrodes

Surfaces and Interfaces 2024年 44卷

作者： Tso, Kuang-Chih Chan, Tzu-Ying Yu, Tsung-Chun Tao, Yu-Jen Chu, Chao-Yi Chen, San-Yuan Lee, Jyh-Fu Ohta, Jun Chen, Po-Chun Wu, Pu-Wei Graduate Program of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Division of Materials Science Graduate School of Science and Technology Nara Institute of Science Technology Nara Ikoma Takayama 8916-5 Japan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei 106 Taiwan National Synchrotron Radiation Research Center Hsinchu 300 Taiwan

We demonstrate a unique chemical formula to deposit hydrous iridium oxide thin film on a platinum-coated polyimide substrate. In a mild alkaline solution, the iridium (III) precursor undergoes the ligand exchange and hydrolysis reaction to become the iridium (III) dimers that are physically adsorbed on the substrate for subsequent heterogeneous condensation and growth of amorphous hydrous iridium oxide thin film. Both UV–Vis and X-ray absorption spectroscopy (XAS) are employed to determine the reaction steps involved. The chemical nature and crystallinity of the hydrous iridium oxide thin film are investigated by XAS, X-ray photon spectroscopy, and X-ray diffraction. The hydrous iridium oxide thin film reveals an impressive normalized charge storage capacity (CSC) of 0.3 mC/cm²-nm and a low impedance (80.5 Ω) at 1k Hz. In addition, in bending test of 3,000 cycles, the hydrous iridium oxide thin film retains 91.2 % of its initial normalized CSC without any physical crack and delamination. The cell viability test suggests negligible bio-toxicity. Our results provide a solid evidence of fabricating a robust flexible electrode for neural interfaces for potential use in implantable electronic devices. © 2023 Elsevier B.V.

关键词： Bio-electrode Flexible substrate Implantable electronic devices Iridium dimers Iridium oxide Polyimide

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Author Correction: Elastic electronics based on micromesh-structured rubbery semiconductor films (vol 5, pg 881, 2022)

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NATURE ELECTRONICS 2023年第1期6卷 86-86页

作者： Guan, Ying-Shi Ershad, Faheem Rao, Zhoulyu Ke, Zhifan da Costa, Ernesto Curty Xiang, Qian Lu, Yuntao Wang, Xu Mei, Jianguo Vanderslice, Peter Hochman-Mendez, Camila Yu, Cunjiang Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing China Department of Mechanical Engineering University of Houston Houston TX USA Department of Biomedical Engineering Pennsylvania State University University Park PA USA Department of Biomedical Engineering University of Houston Houston TX USA Department of Engineering Science and Mechanics Pennsylvania State University University Park PA USA Materials Science and Engineering Program University of Houston Houston TX USA Department of Materials Science and Engineering Materials Research Institute Pennsylvania State University University Park PA USA Department of Chemistry Purdue University West Lafayette IN USA Regenerative Medicine Research Texas Heart Institute Houston TX USA Molecular Cardiology Research Laboratory Texas Heart Institute Houston TX USA

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Real-time temperature correction for magnetoresistive biosensors integrated with temperature modulator

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Biosensors and Bioelectronics: X 2023年 14卷 100356页

作者： Kim, Songeun Wang, Shan X. Lee, Jung-Rok Division of Mechanical and Biomedical Engineering Ewha Womans University Seoul03760 Korea Republic of Graduate Program in Smart Factory Ewha Womans University Seoul03760 Korea Republic of Department of Materials Science and Engineering Stanford University StanfordCA93405 United States Department of Electrical Engineering Stanford University StanfordCA93405 United States

Magnetoresistance-based biosensors utilize changes in electrical resistance upon varying magnetic fields to measure biological molecules or events involved with magnetic tags. However, electrical resistance fluctuates with temperature. To decouple unwanted temperature-dependent signals from the signal of interest, various methods have been proposed to correct signals from magnetoresistance-based biosensors. Yet, there is still a need for a temperature correction method capable of instantaneously correcting signals from all sensors in an array, as multiple biomarkers need to be detected simultaneously with a group of sensors in a central laboratory or point-of-care setting. Here we report a giant magnetoresistive biosensor system that enables real-time temperature correction for individual sensors using temperature correction coefficients obtained through a temperature sweep generated by an integrated temperature modulator. The algorithm with individual temperature correction coefficients obviously outperformed that using the average temperature correction coefficient. Further, temperature regulation did not eliminate temperature-dependent signals completely. To demonstrate that the method can be used in biomedical applications where large temperature variations are involved, binding kinetics experiments and melting curve analysis were conducted with the temperature correction method. The method successfully removed all temperature-dependent artifacts and thus produced more precise kinetic parameters and melting temperatures of DNA hybrids. © 2023 The Authors

关键词： Kinetics

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Graphene-based analog of single-slit electron diffraction

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Physical Review B 2023年第12期108卷 125420-125420页

作者： Dipanjan Saha Dacen Waters Ching-Chen Yeh Swapnil M. Mhatre Ngoc Thanh Mai Tran Heather M. Hill Kenji Watanabe Takashi Taniguchi David B. Newell Matthew Yankowitz Albert F. Rigosi Physical Measurement Laboratory National Institute of Standards and Technology (NIST) Gaithersburg Maryland 20899 USA Intelligence Community Postdoctoral Research Fellowship Program University of Washington Seattle Washington 98195 USA Department of Physics University of Washington Seattle Washington 98195 USA Department of Physics National Taiwan University Taipei 10617 Taiwan Joint Quantum Institute University of Maryland College Park Maryland 20742 USA Research Center for Functional Materials National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan Department of Materials Science and Engineering University of Washington Seattle Washington 98195 USA

In this paper, we report on the experimental demonstration of single-slit diffraction exhibited by electrons propagating in encapsulated graphene with an effective de Broglie wavelength corresponding to their attributes as massless Dirac fermions. Nanometer-scale device designs were implemented to fabricate a single-slit followed by five detector paths. Predictive calculations were also utilized to readily understand the observations reported. These calculations required the modeling of wave propagation in ideal case scenarios of the reported device designs to more accurately describe the observed single-slit phenomenon. This experiment was performed at room temperature and 190 K, where data from the latter highlighted the exaggerated asymmetry between electrons and holes, recently ascribed to slightly different Fermi velocities near the K point. This observation and device concept may be used for building diffraction switches with versatile applicability.

关键词： Interference & diffraction of light Electrons Graphene

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Reduced graphene oxide-manganese ferrite/zinc oxide nanorods coated carbonized cotton fabric for absorption-dominant electromagnetic interference shielding

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Surfaces and Interfaces 2024年 46卷

作者： Gupta, Shivam Tripathy, Anupam Ruturaj Tai, Nyan-Hwa Department of Materials Science and Engineering National Tsing Hua University No. 101 Sec. 2 Guang-Fu Road Hsinchu 300 Taiwan Institute of NanoEngineering and MicroSystems National Tsing Hua University No. 101 Sec. 2 Guang-Fu Road Hsinchu 300 Taiwan

In this interconnected world, safeguarding electronic devices from electromagnetic interference (EMI) is crucial. This study introduces an innovative approach to enhance EMI shielding by synergistically coating cotton fabric with vertically aligned zinc oxide nanorods (ZnO NRs) and reduced graphene oxide-magnetic ferrite nanoparticles (RGO-MF). Vertical ZnO NRs coating is achieved by seeding cotton fabric with ZnO nanoparticles, followed by hydrothermal NR growth. Subsequently, uniform RGO-MF coating is carried out by spraying a solution of graphene oxide-MF nanoparticles onto ZnO NRs coated cotton, followed by thermal annealing to reduce graphene oxide. Our observations reveal that EMI shielding effectiveness increases with RGO loading, while reflection loss decreases due to enhanced cotton fabric conductivity. Careful optimization of RGO-MF on ZnO NRs coated cotton is demonstrated. The incorporation of MF nanoparticles not only improves EMI shielding but also enhances reflection loss, highlighting the shield's absorption-dominant nature. The resulting RGO-MF/ZnO NRs coated cotton exhibits a high total EMI shielding effectiveness of ∼55 dB, reflection loss of 6.8 dB, and an absorption coefficient of 74.5 %, which attribute to the remarkable dielectric properties of ZnO NRs, the exceptional conductivity of RGO sheets, the strong magnetism of MF nanoparticles, and the enhanced core-shell structure of the cotton fabric with these materials. © 2024 Elsevier B.V.

关键词： Electrical properties Electron microscopy EMI shielding Fabric composites Microwave absorption

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Detection of COVID-19 infection based on electronic nose technique: preliminary study

Detection of COVID-19 infection based on electronic nose tec...

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2022 International Electrical engineering Congress, iEECON 2022

作者： Phukkaphan, Natnaree Eamsa-Ard, Tanthip Aunsa-Ard, Wandee Khunarak, Chayanin Nitivanichsakul, Tuleeya Roongpuvapaht, Boonsam Kerdcharoen, Teerakiat Mahidol University Materials Science and Engineering Program Faculty of Science Bangkok Thailand Chakri Naruebodindra Medical Institute Faculty of Medicine Ramathibodi Hospital Mahidol University Samut Prakan Thailand Department of Otolaryngology Head and Neck Surgery Ramathibodi Hospital Faculty of Medicine Mahidol University Bangkok Thailand Department of Physics Faculty of Science Mahidol University Bangkok Thailand Research Network of NANOTEC Mahidol University National Nanotechnology Center Thailand

ISBN: (纸本)9781665402064

The coronavirus COVID-19 pandemic have reached almost every country in the world and caused a global health crisis. It is necessary to detect COVID-19 with fast and accurate diagnosis method in order to prevent the rapid spread of Covid-19. This paper presents a preliminary study of using electronic nose (e-nose) technology for detection of COVD-19 infection. In this experiment, the human exhaled breaths of healthy volunteers, asymptomatic and symptomatic COVID-19 patients were collected with commercial face masks for 5 minutes followed by the measurement with an e-nose machine in a closed system. The COVID-19 positivity was confirmed by RT-PCR method. According to the experiment, the odor intensity of human exhaled breath can be described with the total sensing response value. The exhaled breath of COVID-19 infected patients show higher odor intensity than the healthy volunteers (control). The Principal Component Analysis (PCA) shows the classification of three data groups;healthy volunteers, COVID-19 infected patients and unclassified people. For the unclassified cases, the medical record has shown that these people have been subjected either to some respiratory diseases or just recovered from COVID-19 infection. From these preliminary results, e-nose technology and its measurement proto-cols can be considered as a viable tool for COVID-19 rapid detection. © 2022 IEEE.

关键词： COVID-19

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Phase Equilibria and Thermodynamics Assessment of the Co-Fe-Nb Ternary System

SSRN

引用

SSRN 2023年

作者： Hutabalian, Yohanes Hermana, Gita Novian Laksono, Andromeda Dwi Chen, Sinn-Wen Department of Chemical Engineering National Tsing Hua University Hsinchu30013 Taiwan Research and Development Center PT. Gotion Indonesia Materials Jakarta12950 Indonesia Department of Advanced Materials Engineering Bandung Polytechnic for Manufacturing West Java Bandung40135 Indonesia Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10672 Taiwan Study Program of Materials and Metallurgical Engineering Institut Teknologi Kalimantan Soekarno-Hatta Street Km. 15 Karang Joang Balikpapan East Kalimantan76127 Indonesia High Entropy Materials Center National Tsing Hua University Hsinchu30013 Taiwan

The Co-Fe-Nb materials system is a crucial material for magnetic applications. Despite its importance, the phase equilibria and thermodynamic characteristics of this ternary system have not been explored in detail. This study employs the Calphad method to model the phase equilibria of the Co-Fe-Nb ternary system. To obtain the ternary interaction parameters, the experimental data on the isothermal sections at temperatures ranging from 700°C to 1300°C was evaluated. These findings indicate that the Co-Fe-Nb system contains no ternary compound, and the (Co,Fe)7Nb6 phase exists as a single solid solution. Significant solubility of the third element in the binary compounds of Co2Nb (laves C14) and Fe2Nb (laves C15) is also observed. The results are in good agreement with the experimental data. Furthermore, a liquidus projection of the system is presented, for the first time, revealing seven primary solidification phases in the Co-Fe-Nb ternary system. © 2023, The Authors. All rights reserved.

关键词： Ternary systems

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Hydrogen Storage Properties of the Ti18V24Nb23Cr33Al2Multicomponent Alloy Using Ti6V4Al Alloy Scraps as Feedstock Material

ACS Sustainable Resource Management

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ACS Sustainable Resource Management 2025年第5期2卷 807-814页

作者： Mariana de Brito Ferraz Claudia Zlotea Walter José Botta Guilherme Zepon Federal University of São Carlos Graduate Program in Materials Science and Engineering (PPGCEM/UFSCar) Rodovia Washington Luiz Km 235 São Carlos 13565-905 São Paulo Brazil Institut de Chimie et des Matériaux de Paris-Est CNRS UMR 7182 2-8 Rue Henri Dunant 94320 Thiais France Federal University of São Carlos Graduate Program in Materials Science and Engineering (PPGCEM/UFSCar) Rodovia Washington Luiz Km 235 São Carlos 13565-905 São Paulo Brazil；Federal University of São Carlos Department of Materials Engineering (DEMa/UFSCar) Rodovia Washington Luiz Km 235 São Carlos 13565-905 São Paulo Brazil

Hydrogen storage in metal hydrides has been extensively studied due to their capacity to reversibly absorb hydrogen under relatively low pressures. Multicomponent alloys, especially those of the Ti-V-Nb-Cr system, have garnered significant attention because of the possibility of fine-tuning the hydrogen storage properties by compositional control. However, most of the investigations on multicomponent alloys rely on high-purity elements as feedstock materials, which can have a substantial environmental impact due to the energy-intensive processes required to achieve such purity levels. In this work, we propose an alternative approach by utilizing Ti6Al4V alloy (ASTM F136) scraps from the biomedical industry as feedstock material to produce Ti18Nb23V24Cr33Al2. The alloy was synthesized by using an arc-melting process, combining Ti6Al4V scraps with other pure elements. Structural analysis using X-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed the formation of a microstructure composed predominantly by a body-centered cubic (BCC) solid solution with a small micro segregation providing additional microstructural insights. The Ti18Nb23V24Cr33Al2alloy exhibited a hydrogen storage capacity of 2.75 wt % H2with room temperature reversibility, presenting hydrogen storage properties comparable to those of a (TiVNb)65Cr35alloy produced only from high-purity *** study presents a sustainable approach to producing Ti18Nb23V24Cr33Al2alloy from Ti6Al4V machine chips, achieving efficient hydrogen storage with reduced environmental impact.

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Illustrating an Effective Workflow for Accelerated materials Discovery

arXiv

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arXiv 2024年

作者： Mulukutla, Mrinalini Nicole Person, A. Voigt, Sven Kuettner, Lindsey Kappes, Branden Khatamsaz, Danial Robinson, Robert Salas, Daniel Xu, Wenle Lewis, Daniel Eoh, Hongkyu Xiao, Kailu Wang, Haoren Saini, Jaskaran Singh Mahat, Raj Hastings, Trevor Skokan, Matthew Attari, Vahid Elverud, Michael Paramore, James D. Butler, Brady Vecchio, Kenneth Kalidindi, Surya R. Allaire, Douglas Karaman, Ibrahim Thomas, Edwin L. Pharr, George Srivastava, Ankit Arróyave, Raymundo Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States School of Materials Science and Engineering Georgia Institute of Technology AtlantaGA30332-0245 United States George W. Woodruff School of Mechanical Engineering Georgia Tech AtlantaGA30332 United States Contextualize LLC LittletonCO United States Department of NanoEngineering University of California La Jolla San DiegoCA92093 United States J. Mike Walker’66 Department of Mechanical Engineering Texas A&M University College StationTX77843 United States College StationTX77843-3003 United States

Algorithmic materials discovery is a multi-disciplinary domain that integrates insights from specialists in alloy design, synthesis, characterization, experimental methodologies, computational modeling, and optimization. Central to this effort is a robust data management system paired with an interactive work platform. This platform should empower users to not only access others’ data but also integrate their analyses, paving the way for sophisticated data pipelines. To realize this vision, there is a need for an integrative collaboration platform, streamlined data sharing and analysis tools, and efficient communication channels. Such a collaborative mechanism should transcend geographical barriers, facilitating remote interaction and fostering a challenge-response dynamic. To further enhance precision and interoperability in this multifaceted research landscape, we must explore innovative ways to refine these processes and improve the integration of expertise and data across diverse domains. In this paper, we present our ongoing efforts in addressing the critical challenges related to an accelerated materials Discovery Framework as a part of the High-Throughput materials Discovery for Extreme Conditions (HTMDEC) Initiative. Our BIRDSHOT (Batchwise Improvement in Reduced materials Design Space using a Holistic Optimization Technique) Center has successfully harnessed various tools and strategies, including the utilization of cloud-based storage, a standardized sample naming convention, a structured file system, the implementation of sample travelers, a robust sample tracking method, and the incorporation of knowledge graphs for efficient data management. Additionally, we present the development of a data collection platform, reinforcing seamless collaboration among our team members. In summary, this paper provides an illustration and insight into the various elements of an efficient and effective workflow within an accelerated materials discovery framework while hig

关键词： Digital storage

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High-Throughput Rapid Experimental Alloy Development (HT-READ)

arXiv

引用

arXiv 2021年

作者： Dippo, Olivia F. Kaufmann, Kevin R. Vecchio, Kenneth S. Materials Science and Engineering Program UC San Diego San DiegoCA92093 United States Department of NanoEngineering UC San Diego San DiegoCA92093 United States

The current bulk materials discovery cycle has several inefficiencies from initial computational predictions through fabrication and analyses. materials are generally evaluated in a singular fashion, relying largely on human-driven compositional choices and analysis of the volumes of generated data, thus also slowing validation of computational models. To overcome these limitations, we developed a high-throughput rapid experimental alloy development (HT-READ) methodology that comprises an integrated, closed-loop material screening process inspired by broad chemical assays and modern innovations in automation. Our method is a general framework unifying computational identification of ideal candidate materials, fabrication of sample libraries in a configuration amenable to multiple tests and processing routes, and analysis of the candidate materials in a high-throughput fashion. An artificial intelligence agent is used to find connections between compositions and material properties. New experimental data can be leveraged in subsequent iterations or new design objectives. The sample libraries are assigned unique identifiers and stored to make data and samples persistent, thus preventing institutional knowledge loss. Copyright © 2021, The Authors. All rights reserved.

关键词： 3D printers

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