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作者： Marie, Mohammed Mandal, Sanghamitra Manasreh, Omar Microelectronics and Photonics Graduate Program University of Arkansas FayettevilleAR72701 United States Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States

Glucose sensor based on ITO/ZnO NRs/GOx/nafion is fabricated and tested under different glucose concentrations. Hydrothermal growth method along with sol-gel technique is used to grow high quality ZnO nanorods that have well-alignment and high density with an acceptable aspect ratio. The as-grown of ZnO nanorods are used to fabricate a working electrode that can be used for glucose detection in blood after a modification process with GOx and nafion membrane. Annealing at 110°C helped in improves the crystallinity of the seed layer and as a result, a high density and well alignment as-grown ZnO nanorods were obtained. High sensitivity and short response time were obtained from the fabricated device with an acceptable lower limit of detection. © Copyright Materials Research Society 2016.

关键词： Sol-gels

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Novel type of ferroelectricity in brownmillerite structures: A first-principles study

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Physical Review Materials 2018年第8期2卷 084402-084402页

作者： Hao Tian Xiao-Yu Kuang Ai-Jie Mao Yurong Yang Hongjun Xiang Changsong Xu S. Omid Sayedaghaee Jorge Íñiguez L. Bellaiche Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Physics Key Laboratory of Computational Physical Sciences (Ministry of Education) State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Microelectronics-Photonics Program and Physics Department University of Arkansas Fayetteville Arkansas 72701 USA Materials Research and Technology Department Luxembourg Institute of Science and Technology (LIST) 5 Avenue des Hauts-Fourneaux L-4362 Esch/Alzette Luxembourg

First-principles calculations are conducted on two magnetic brownmillerites, namely, Ca2Co2O5 and Sr2Co2O5. Both systems possess a previously overlooked polar Pmc21 phase that is low in energy. This ferroelectric state is even predicted to be the ground state of Sr2Co2O5, which therefore renders such material multiferroic. Strikingly, the ferroelectricity associated with this Pmc21 phase involves an original energetic coupling that is linear in the polar mode, quadratic in another distortion, and linear in a third mode. Such ferroelectricity is therefore of a novel type, since it differs from previously reported proper, improper, hybrid improper, and triggered kinds of ferroelectricity.

关键词： Defects Ferroelectricity First-principles calculations Crystal structures Multiferroics Oxides Density functional theory

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Simulation, fabrication, and measurement of a plasmonic-enhanced terahertz photoconductive antenna 9

Simulation, fabrication, and measurement of a plasmonic-enha...

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Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX

作者： Burford, Nathan El-Shenawee, Magda Microelectronics-Photonics Program University of Arkansas 731 W. Dickson St. FayettevilleAR72701 United States Department of Electrical Engineering 3217 Bell Engineering Center FayettevilleAR72701 United States

ISBN: (纸本)9781628419825

In this work a new plasmonic thin-film based terahertz photoconductive antenna is proposed. The computational method utilized to design the antenna is outlined, as well as the steps and preliminary results for the fabrication and characterization of the device. The model predicted over two orders of magnitude increase in the peak photocurrent as compared to a conventional device design, while slightly reducing the width of the induced current pulse. This indicates that the proposed design will be effective as a high efficiency terahertz emitter. In addition to the computational modeling, preliminary results demonstrating the proposed fabrication processes and experimental characterization are presented. It is demonstrated that when using a pyroelectric detector to quantify the output terahertz power it is important to first quantify the power of the IR photons generated by thermal relaxation in the device. © 2016 SPIE.

关键词： Finite element method

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Fabrication of nanoelectrode ensembles using silicon nanowires in an electrochemical glucose sensor

Fabrication of nanoelectrode ensembles using silicon nanowir...

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IEEE SENSORS

作者： Sanghamitra Mandal Mohammed Marie Omar Manasreh Department of Electrical Engineering University of Arkansas Fayetteville Arkansas USA Microelectronics Photonics Program University of Arkansas Fayetteville Arkansas USA

Gold (Au) nanoelectrode ensembles (NEEs) were investigated after the synthesis of silicon nanowires using the metal assisted chemical etching technique. Structural and non-destructive optical characterization of silicon nanowires are carried out to determine its morphology and crystallinity. The cyclic voltammetry technique is used to determine the oxidation-reduction potentials of the sensor at different voltage scan rates of 100, 200, and 300 mV/s. Amperometric measurement at a fixed oxidation potential of 0.6 V is performed to measure the sensitivity, response time, and detection limit of the sensor. The presence of Au NEEs improve the signal to noise ratio of the sensor. Therefore, the sensor exhibits a high sensitivity of 0.4 mA/mM cm 2 with a response time of 1 s, and a limit of detection 0.077 mM.

关键词： Silicon Nanowires Sugar Gold Etching Fabrication Sensitivity

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Electromechanical properties of one dimensinal carbon chains 9

Electromechanical properties of one dimensinal carbon chains

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9th IEEE International Conference on Nano/Molecular Medicine and Engineering, NANOMED 2015

作者： Salman, Zeina Nair, Arun Tung, Steve Microelectronics and Photonics Graduate Program University of Arkansas FayettevilleAR72701 United States Department of Mechanical Engineering University of Arkansas FayettevilleAR72701 United States

ISBN: (纸本)9781467396714

Carbon based nanostructures such as graphene and carbon nanotubes have received widespread attention due to their unique mechanical and electronic properties. This paper describes a quantum mechanics based study of the electronic band structures and transport properties of one-dimensional (1D) carbon chains, the thinnest nanowires available in nature. The study is based on the application of density functional theory and non-equilibrium Green's function where maximally localized Wannier functions and Landauer formalism are combined to compute the electronic band structures and quantum conductance of the 1D carbon chains. The simulation result indicates that the peak quantum conductance of 1D carbon chains is about five times smaller than that of carbon nanotubes. However, the quantum conductance is also a function of the length and chemical bonds of the carbon chains. When the carbon chains are mechanically strained at 3%, the quantum conductance is reduced by about 50%. This result suggests 1D carbon chains can provide ultra high-resolution electromechanical measurements of important biomolecules such as DNA. © 2015 IEEE.

关键词： Carbon nanotubes

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Plasmon optics and thermal dissipation in nanocomposite thin films

Plasmon optics and thermal dissipation in nanocomposite thin...

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2015 MRS Spring Meeting

作者： Dunklin, Jeremy R. Forcherio, Gregory T. Berry, Keith R. Roper, D.K. Department of Chemical Engineering University of Arkansas FayettevilleAR72701 United States MicroElectronics-Photonics Graduate Program University of Arkansas FayettevilleAR72701 United States

ISBN: (纸本)9781510826427

Optical properties and thermal relaxation dynamics of resonantly excited plasmons are important in applications for optoelectronics, biomedicine, energy, and catalysis. Geometric optics of polydimethylsiloxane (PDMS) thin films containing uniformly or asymmetrically distributed polydisperse reduced AuNPs or uniformly distributed monodisperse solution-synthesized AuNPs were recently evaluated using a compact linear algebraic sum. Algebraic calculation of geometric transmission, reflection, and attenuation for AuNP-PDMS films provides a simple, workable alternative to effective medium approximations, computationally expensive methods, and fitting of experimental data. This approach allows for the summative optical responses of a sequence of 2D elements comprising a 3D assembly to be analyzed Thin PDMS films containing 3-7 micron layers of reduced AuNPs were fabricated with a novel diffusive-reduction synthesis technique. Rapid diffusive reduction of AuNPs into asymmetric PDMS thin films provided superior photothermal response relative to thicker films with AuNPs reduced throughout, with a photon-to-heat conversion of up to 3000°C/watt which represents 3-230-fold increase over previous AuNP-functionalized systems. Later work showed that introduction of AuNPs into PDMS enhanced thermoplasmonic dissipation coincident with internal reflection of incident resonant irradiation. Measured thermal emission and dynamics of AuNP-PDMS thin films exceeded emission and dynamics attributable by finite element analysis to Mie absorption, Fourier heat conduction, Rayleigh convection, and Stefan-Boltzmann radiation. Refractive-index matching experiments and measured temperature profiles indicated AuNP-containing thin films internally reflected light and dissipated power transverse to the film surface. Enhanced thermoplasmonic dissipation from metal-polymer nanocomposite thin films could affect opto- and bio-electronic implementation of these systems. © 2015 Materials Research Society.

关键词： Thin films

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Plasmon optics and thermal dissipation in nanocomposite thin films

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MRS Online Proceedings Library (OPL) 2015年第1期1788卷 23-28页

作者： Jeremy R. Dunklin Gregory T. Forcherio Keith R. Berry Jr. D.K. Roper Department of Chemical Engineering University of Arkansas Fayetteville AR 72701 MicroElectronics-Photonics Graduate Program University of Arkansas Fayetteville AR 72701

Optical properties and thermal relaxation dynamics of resonantly excited plasmons are important in applications for optoelectronics, biomedicine, energy, and catalysis. Geometric optics of polydimethylsiloxane (PDMS) thin films containing uniformly or asymmetrically distributed polydisperse reduced AuNPs or uniformly distributed monodisperse solution-synthesized AuNPs were recently evaluated using a compact linear algebraic sum. Algebraic calculation of geometric transmission, reflection, and attenuation for AuNP-PDMS films provides a simple, workable alternative to effective medium approximations, computationally expensive methods, and fitting of experimental data. This approach allows for the summative optical responses of a sequence of 2D elements comprising a 3D assembly to be analyzed. Thin PDMS films containing 3-7 micron layers of reduced AuNPs were fabricated with a novel diffusive-reduction synthesis technique. Rapid diffusive reduction of AuNPs into asymmetric PDMS thin films provided superior photothermal response relative to thicker films with AuNPs reduced throughout, with a photon-to-heat conversion of up to 3000°C/watt which represents 3-230-fold increase over previous AuNP-functionalized systems. Later work showed that introduction of AuNPs into PDMS enhanced thermoplasmonic dissipation coincident with internal reflection of incident resonant irradiation. Measured thermal emission and dynamics of AuNP-PDMS thin films exceeded emission and dynamics attributable by finite element analysis to Mie absorption, Fourier heat conduction, Rayleigh convection, and Stefan-Boltzmann radiation. Refractive-index matching experiments and measured temperature profiles indicated AuNP-containing thin films internally reflected light and dissipated power transverse to the film surface. Enhanced thermoplasmonic dissipation from metal-polymer nanocomposite thin films could affect opto- and bio-electronic implementation of these systems.

关键词： polymer Au film

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Enhancement of Terahertz Imaging of Packaged Power Electronic Devices

Enhancement of Terahertz Imaging of Packaged Power Electroni...

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IEEE International Symposium on Antennas and Propagation

作者： Nathan M. Burford Magda O. El-Shenawee Microelectronics-Photonics Program University of Arkansas Fayetteville AR USA Department of Electrical Engineering University of Arkansas Fayetteville AR USA

ISBN: (纸本)9781479978168

Nondestructive imaging of packaged silicon carbide power transistors was performed using terahertz (THz) time-domain reflection imaging. Techniques were developed to process the data gathered by these measurements and enhance the quality of the THz time-domain images. It was found that applying high-pass error function filters in the frequency domain provided the best balance of improving image clarity and minimizing distortion of the time-domain signal. The results indicate that with proper data processing, THz imaging can be a viable nondestructive method for inspecting packaged power electronic devices.

关键词： terahertz power electronic devices Terahertz Imaging Packaging image definition Refractive surgery enhancement Frequency-domain analysis

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Modeling of plasmonic terahertz antennas using COMSOL® multiphysics

Modeling of plasmonic terahertz antennas using COMSOL® mult...

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Antennas and Propagation Society International Symposium

作者： Nathan Burford Magda El-Shenawee Microelectronics-Photonics Program University of Arkansas Fayetteville AR USA Department of Electrical Engineering University of Arkansas Fayetteville AR USA

A computational model allowing for the study of terahertz photoconductive antennas is presented. This model allows for nanoscale geometry variations in three dimensions. The model is validated using measurements data. The preliminary results illustrate the effectiveness of the model in calculating the time-dependent photocurrent collected by the antenna as well as the total photocurrent enhancement of the terahertz antenna as compared to the non-plasmonic design. This model will be used as a tool to design a more enhanced plasmonic terahertz photoconductive antenna as will be presented in the conference.

关键词： Photoconductivity Plasmons Antennas Principal component analysis Optical pulses Mathematical model Computational modeling

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Energy Demand Analysis of Photovoltaic Device – Material and Nanomanufacturing Process Discovery

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Procedia Manufacturing 2015年 1卷 226-237页

作者： Shilpi Mukherjee Gregory Salamo Ajay P. Malshe Microelectronics and Photonics Program University of Arkansas Fayetteville AR Institute of Nano Materials Science and Engineering University of Arkansas Fayetteville AR Materials and Manufacturing Research Labs Mechanical Engineering University of Arkansas Fayetteville AR

Most solar cell manufacturing plants and research laboratories in the U.S. use non-renewable energy for their operations. This energy paradox must be addressed, especially due to the increased spending toward photovoltaic (PV) technology research and manufacturing fueled by the growing demand for renewable energy supply. At the same time, it is also important that the scientific community be made aware of the energy cost of energy research. While keeping scientific discovery a priority, it must be understood that energy is precious and must be conserved, including at the research and development stage of a product's life cycle. With energy conservation in mind, a case study was conducted to quantify the energy demand for the research phase of an emerging PV technology and identify energy intensive components. The test-bed system chosen for this study was a quantum-wire (QWR) based intermediate band solar cell grown by molecular beam epitaxy (MBE) and fabricated by photolithography. This paper presents the results of the energy demand analysis performed on the QWR-based solar cell research test-bed system. Life cycle assessment (LCA), an internationally accepted tool for energy and sustainability analysis, was chosen as the methodology for conducting this case study.

关键词： energy solar photovoltaic life cycle sustainability renewable energy

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