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The dislocation structure of slip bands in deformed high entropy alloy nanopillars

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Journal of materials Science & Technology 2021年第36期95卷 136-144页

作者： Qun Yang Yang Hu Jian-Min Zuo Department of materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801United States School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China frederick seitz materials research laboratory University of Illinois at Urbana-ChampaignUrbanaIllinois 61801United States

Remarkable diversity is observed in dislocation interactions that are responsible for intermittent and sudden crystal *** large crystal slips can be easily observed on the surface of deformed crystals,unraveling the underlying dislocation interaction mechanisms,however,has been a longstanding challenge in the study of single-crystal plasticity.A recent study demonstrated that the sluggish dislocation dynamics in the high entropy alloy(HEA)of Al_(0.1)CoCrFeNi enables the observation of slip bands for a direct link to dislocation avalanches in a ***,we further examined the dislocation structure of slip bands in the HEA nanopillars oriented for single *** evidence was provided on the dislocation organization in a slip band based on groups of primary dislocations,secondary dislocations,and dislocation *** results were compared with the previously proposed slip band *** unique aspects of the HEA that enable such observations were also investigated through an examination of the dislocation microstructure and its response to applied forces in the HEA nanopillars.

关键词： Crystal plasticity Dislocation structure Nanopillars High entropy alloy Slip band Transmission electron microscopy

Optical Properties of Laterally Aligned Si Nanowires for Transparent Electronics Applications

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Nano research 2011年第9期4卷 817-823页

作者： Dong Hyun Lee Jaeseok Yi Won Woo Lee Ungyu Paik John A. Rogers Won II Park Division of materials Science and Engineering Hanyang University Seoul 133-791 Korea Department of Energy Engineering Hanyang University Seoul 133-791 Korea Department of materials Science and Engineering Department of Chemistry Department of Mechanical Science and Engineering Beckman Institute and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA

We have investigated the optical properties of laterally aligned Si nanowire （SiNW） arrays in order to explore their potential applicability in transparent electronics. The SiNW array exhibited good optical transparency in the visible spectral range with a transmittance of -90% for a NW density of -20-25 per 10 μm. In addition, polarization-dependent measurements revealed a variation in transmittance in the range of 80%-95% depending on the angle between the polarization of incident light and the NW axis. Using the SiNWs, we demonstrated that transparent transistors exhibit good optical transparency （greater than 80%） and showed typical p-type SiNW transistor characteristics.

关键词： Si nanowire optical properties transparent thin film transistor finite-difference time-domain (FDTD) modeling

MECHANICS ANALYSIS OF TWO-DIMENSIONALLY PresTRAINED ELASTOMERIC THIN FILM FOR STRETCHABLE ELECTRONICS

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Acta Mechanica Solida Sinica 2010年第6期23卷 592-599页

作者： Ming Li JianUang Xiao Jian Wu Rak-Hwan Kim Zhan Kang Yonggang Huang John A. Rogers State Key laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China Departments of Civil and Environmental Engineering and Mechanical Engineering Northwestern University Evanston IL 60208 USA Department of materials Science and Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana IL 61801 USA

Various methods have been developed to fabricate highly stretchable electronics. Recent studies show that over 100% two dimensional stretchability can be achieved by mesh structure of brittle functioning devices interconnected with serpentine bridges. Kim et al show that pressing down an inflated elastomeric thin film during transfer printing introduces two di- mensional prestrain, and therefore further improves the system stretchability. This paper gives a theoretical study of this process, through both analytical and numerical approaches. Simple analytical solutions are obtained for meridional and circumferential strains in the thin film, as well as the maximum strain in device islands, which all agree reasonably well with finite element analysis.

关键词： stretchable electronics shell soft materials

Microstructural and Surface Morphological Evolution at the Atomic Scale during Sputter Deposition of TiN:a HR-TEM,XRD,STM,and Modeling Study

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Microstructural and Surface Morphological Evolution at the A...

Theoretical and Experimental Studies of Schottky Diodes that Use Aligned Arrays of Single-Walled Carbon Nanotubes

2003年纳米和表面科学与技术全国会议

作者： Joe Greene frederick seitz materials research laboratory Dept. materials Science Univ. Illinois Urbana IL 61801 USA

Polycrystalline TiN and related transition-metal (TM) nitride thin films are typically deposited by reactive magnetron sputter deposition and used as diffusion barriers in microelectronics as well as hard, wear, and corrosion resistant coatings in mechanical and optical applications. Since all cubic TM nitrides are highly anisotropic, control of preferred

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Nano research 2010年第6期3卷 444-451页

作者： Xinning Ho Lina Ye Slava V.Rotkin Xu Xie Frank Du Simon Dunham Jana Zaumseil John A.Rogers Department of materials Science and Engineering Beckman Instituteand Frederick Seitz Materials Research LaboratoryUniversity of Illinois at Urbana-Champaign1304 West Green StreetUrbanaIllinois 61801USA Department of Chemistry University of Science and Technology of ChinaHefei 230026China Department of Physics Lehigh UniversityBethlehemPennsylvania 18015 and Centre for Advanced Materials and NanotechnologyLehigh UniversityBethlehemPennsylvania 18015USA Center for Nanoscale materials Argonne National LaboratoryArgonneIllinois 60439USA Department of Chemistry University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Electrical and Computer Engineering Mechanical Science and EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA

We present theoretical and experimental studies of Schottky diodes that use aligned arrays of single-walled carbon nanotubes. A simple physical model, taking into account the basic physics of current rectification, can adequately describe the single-tube and array devices. We show that for as-grown array diodes, the rectification ratio, defined by the maximum-to-minimum-current-ratio, is low due to the presence of metallic-single-walled nanotube (SWNT) shunts. These tubes can be eliminated in a single voltage sweep resulting in a high rectification array device. Further analysis also shows that the channel resistance, and not the intrinsic nanotube diode properties, limits the rectification in devices with channel length up to 10 μm.

关键词： Schottky diodes aligned arrays single-walled carbon nanotubes

Influencing mechanism of pre-existing nanoscale Al5Fe2 phase on Mg-Fe interface in friction stir spot welded Al-free ZK60-Q235 joint

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Journal of materials Science & Technology 2020年第7期42卷 220-228页

作者： R.Z.Xu Q.Yang D.R.Ni B.L.Xiao C.Z.Liu Z.Y.Ma Institute of Metal research Chinese Academy of SciencesShenyang110016China College of Material Science and Engineering Shenyang Aerospace UniversityShenyang110136China Department of materials Science and Engineering University of Illinois at Urbana-Champaign1304 W Green StUrbanaIL61801United States Fredrick seitz materials research laboratory University of Illinois at Urbana-Champaign104 S Goodwin AveUrbanaIL61801United States

Al-free ZK60 magnesium (Mg) alloy sheet was selected as substrate material of Mg-steel pinless friction stir spot welding (FSSW), avoiding the effect of the Al element in the substrate on the alloying reaction of Mg-iron (Fe) interface. The sound FSSW joint of ZK60 Mg alloy and Q235 steel with a hot-dipped aluminum (Al)-containing zinc (Zn) coating was successfully realized. The detailed microstructural examinations proved that Al5Fe2 phase at the Mg-Fe interface came from the pre-existing Al5Fe2 phase in the coating and acted as the transition layer for promoting the metallurgical bonding of Mg and Fe. The interfaces with well-matched lattice sites among Fe, Al5Fe2 and Mg were formed during FSSW. A low energy interface with good match of lattice sites ((002)Al5Fe2//(110)Fe, [110]Al5Fe2//[113]Fe) between Al5Fe2 and Fe was identified. For the interface between Al5Fe2 and Mg, an orientation relationship of (622)Al5Fe2//(3112)Mgand[158]Al5Fe2//[2423]Mg was observed. The tensile-shear load of the ZK60-steel joint could reach 4.6 kN. Moreover, the joint fracture occurred at the interface between the Al5Fe2 layer and the Mg alloy substrate, suggesting the brittle fracture characteristic.

关键词： Dissimilar welding Friction stir spot welding Magnesium alloys Steels Zinc coating

Multimodal epidermal devices for hydration monitoring

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Microsystems & Nanoengineering 2017年第1期3卷 267-277页

作者： Siddharth Krishnan Yunzhou Shi R.Chad Webb Yinji Ma Philippe Bastien Kaitlyn E.Crawford Ao Wang Xue Feng Megan Manco Jonas Kurniawan Edward Tir Yonggang Huang Guive Balooch Rafal M.Pielak John A.Rogers Department of materials Science and Engineering Frederick Seitz Materials Research LaboratoryUniversity of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA L’Oreal Tech Incubator California Research Center953 Indiana StreetSan FranciscoCA 94107USA Department of Civil and Environmental Engineering Mechanical EngineeringMaterials Science and EngineeringNorthwestern UniversityEvanstonIL 60208USA L’Oréal research and Innovation 1 Avenue Eugène SchullerAulnay sous Bois 93601France Department of Engineering Mechanics Center for Mechanics and MaterialsTsinghua UniversityBeijing 100084China L’Oréal Early Clinical 133 Terminal AvenueClarkNJ 07066USA Departments of materials Science and Engineering Biomedical EngineeringChemistryMechanical EngineeringElectrical Engineering and Computer Scienceand Neurological SurgeryCenter for Bio-Integrated ElectronicsSimpson Querrey Institute for Nano/biotechnologyNorthwestern UniversityEvanstonIL 60208USA

Precise,quantitative in vivo monitoring of hydration levels in the near surface regions of the skin can be useful in preventing skinbased pathologies,and regulating external *** we introduce multimodal sensors with important capabilities in this context,rendered in soft,ultrathin,‘skin-like’formats with numerous advantages over alternative technologies,including the ability to establish intimate,conformal contact without applied pressure,and to provide spatiotemporally resolved data on both electrical and thermal transport properties from sensitive regions of the *** in vitro studies and computational models establish the underlying measurement principles and associated approaches for determination of temperature,thermal conductivity,thermal diffusivity,volumetric heat capacity,and electrical impedance using simple analysis *** studies on 20 patients subjected to a variety of external stimuli validate the device operation and allow quantitative comparisons of measurement capabilities to those of existing state-of-the-art tools.

关键词： epidermal electronics hydration monitoring thermal characterization

Random Networks and Aligned Arrays of Single-Walled Carbon Nanotubes for Electronic Device Applications

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Nano research 2008年第4期1卷 259-272页

作者： Qing Cao John A.Rogers Department of Chemistry University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA frederick-seitz materials research laboratory University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA

Singled-walled carbon nanotubes(SWNTs),in the form of ultrathin fi lms of random networks,aligned arrays,or anything in between,provide an unusual type of electronic material that can be integrated into circuits in a conventional,scalable *** electrical,mechanical,and optical properties of such fi lms can,in certain cases,approach the remarkable characteristics of the individual SWNTs,thereby making them attractive for applications in electronics,sensors,and other *** review discusses the synthesis and assembly of SWNTs into thin film architectures of various types and provides examples of their use in digital electronic circuits with levels of integration approaching 100 transistors and in analog radio frequency(RF)systems with operating frequencies up to several gigahertz,including transistor radios in which SWNT transistors provide all of the active *** results represent important steps in the development of an SWNT-based electronics technology that could fi nd utility in areas such as fl exible electronics,RF analog devices and others that might complement the capabilities of established systems.

关键词： Carbon nanotubes electronic devices thin-film transistors

Effect of Curvature of Tip and Convexity of Electrode on Localization of Particles

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Open Journal of Fluid Dynamics 2015年第4期5卷 295-301页

作者： Sudarshan Ghonge D. Nagendra Prasad Swarnim Narayan Hains Francis Astha Sethi Subimal Deb Souri Banerjee Department of Physics Birla Institute Technology and Science-Pilani Hyderabad Campus Hyderabad India Department of Physics and frederick seitz materials research laboratory University of Illinois Urbana-Champaign IL USA Department of Physics GIT GITAM University Visakhapatnam India

We investigate the effect of curvature of the tip and the convexity of an electrode on the localization of suspended particles under the combined effect of dielectrophoresis and AC electroosmosis through simulations using COMSOL Multiphysics. A systematic analysis of the parameters defining the convexity of the electrode—the radius of the tip and the apex angle shows that suspended particles can be trapped closely to the electrode edges for comparatively larger tip radii and apex angles. This in turn should favour the trapping of polarizable molecules between the electrodes only if the fluid velocities at the vortices are not very strong.

关键词： Finite Element Method Transport Dynamics AC Electroosmosis Dielectrophoresis Vortex