Dissertations / Theses on the topic 'Electrode interface'
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Gonzalez, Sara. "Operando Chemistry and Electronic Structure of Electrode/Ferroelectric Interfaces." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS501/document.
In the past decade, oxide-based heterostructures have been studied extensively as potentially attractive systems for applications in nanoelectronics. Among them, ferroelectric materials raised interest as potential support for those technological applications. Indeed, their spontaneous electric polarization easily switched by applying an electric field makes them a good basis for non-volatile data storage. Switching the polarization requires a metallic contact with an electrode, thus heterostructures of ferroelectric thin films with metallic electrodes have been widely studied. At the interface between those two materials, free charges of the electrode help screening the polarization induced surface charges detrimental to maintaining proper polarization in the ferroelectric thin film. With metallic oxide electrodes, an ionic displacement at the electrode/ferroelectric interface will help the screening. However, despite important theoretical discoveries, direct experimental data is scarce and further understanding of the interface behavior is crucial for a proper integration of ferroelectric films in functioning nanometer sized devices. In this thesis, photoemission spectroscopy based techniques are used to probe the buried interface of an electrode/BaTiO₃/electrode heterostructure, for two different electrodes: the metallic oxide SrRuO₃ and the Co metal. We acquired information on the behavior of the interface and its response to polarization switching. This work is a new step towards a complete understanding on the behavior of the interface between electrodes and the BaTiO₃ ferroelectric, in device-like heterostructures, in terms of electronic properties, kinetic, and fatigue. The experiments presented combined state of the art characterization techniques, where the use of hard X-rays and in situ bias application made it possible to resolve the difficult task of probing buried interfaces in working conditions
Viana, Casals Damià. "EGNITE: Engineered Graphene for Neural Interface." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/673330.
La tecnología de implantes neuronales en medicina tiene como objetivo restaurar la funcionalidad del sistema nervioso en casos de degeneración o daño grave registrando o estimulando la actividad eléctrica del tejido nervioso. Los implantes neurales disponibles actualmente ofrecen una eficacia clínica modesta, en parte debido a las limitaciones que plantean los metales utilizados en la interfaz eléctrica con el tejido. Dichos materiales comprometen la resolución de la interfaz y, por lo tanto, la restauración funcional con el rendimiento y la estabilidad. En este trabajo presento unos implantes neuronales flexibles basados en una película delgada de grafeno poroso nanoestructurado y biocompatible que proporciona una interfaz neural bidireccional estable y de alto rendimiento. En comparación con los dispositivos de microelectrodos de platino estándar, electrodos de 25 μm de diámetro basados en grafeno ofrecen una impedancia significativamente menor y pueden inyectar de forma segura 200 veces más carga durante más de 100 millones de pulsos. Aquí evaluo sus capacidades in vivo registrando actividad epicortical con alta fidelidad y alta resolución, estimulando subconjuntos de axones dentro del nervio ciático con umbrales de corriente bajos y alta selectividad y modulando la actividad de la retina con alta precisión. La tecnología de película fina de grafeno aquí descrita tiene el potencial de convertirse en el nuevo punto de referencia para la próxima generación de tecnología de implantes neuronales.
Neural implants technology in medicine aims to restore nervous system functionality in cases of severe degeneration or damage by recording or stimulating the electrical activity of the nervous tissue. Currently available neural implants offer a modest clinical efficacy partly due to the limitations posed by the metals used at the electrical interface with the tissue. Such materials compromise interfacing resolution, and therefore functional restoration, with performance and stability. In this work, I present flexible neural implants based on a biocompatible nanostructured porous graphene thin film that provides a stable and high performance bidirectional neural interface. Compared to standard platinum microelectrode devices, the graphene-based electrodes of 25 μm diameter offer significantly lower impedance and can safely inject 200 times more charge for more than 100 million pulses. I assessed their performance in vivo by recording high fidelity and high resolution epicortical activity, by stimulating subsets of axons within the sciatic nerve with low thresholds and high selectivity and by modulating the retinal activity with high precision. The graphene thin film technology I describe here has the potential to become the new performance benchmark for the next generation of neural implant technology.
Universitat Autònoma de Barcelona. Programa de Doctorat en Enginyeria Electrònica i de Telecomunicació
Irvine, June Karin. "Modelling of the electrode-electrolyte interface impedance." Thesis, University of Ulster, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438801.
Jeschull, Fabian. "Polymers at the Electrode-Electrolyte Interface : Negative Electrode Binders for Lithium-Ion Batteries." Doctoral thesis, Uppsala universitet, Strukturkemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317739.
Hanekom, Tania. "Modelling of the electrode-auditory nerve fibre interface in cochlear prostheses." Diss., University of Pretoria, 2001. http://hdl.handle.net/2263/27742.
Dissertation (PhD(Electronic Engineering))--University of Pretoria, 2001.
Electrical, Electronic and Computer Engineering
Unrestricted
Young, Samantha. "Designing the Nanoparticle/Electrode Interface for Improved Electrocatalysis." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23723.
2019-01-27
Han, Qi. "Electrocatalysis at the Electrode-Adsorbate-Solution Interface: Fundamental Studies." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1574855036013662.
Rykaczewski, Konrad. "Electron beam induced deposition (EBID) of carbon interface between carbon nanotube interconnect and metal electrode." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31773.
Committee Chair: Dr. Andrei G. Fedorov; Committee Member: Dr. Azad Naeemi; Committee Member: Dr. Suresh Sitaraman; Committee Member: Dr. Vladimir V. Tsukruk; Committee Member: Dr. Yogendra Joshi. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Yamada, Izumi. "Studies on Litihum Ion Transfer at Positive-electrode/Electrolyte Interface." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/77798.
Yang, H. "Infra red spectroscopic investigation of adsorption at the electrode/electrolyte interface." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378270.
Foster, Simon Edward. "Routes to interfacial deposition of platinum microparticles in solid polymer fuel cells." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/28053.
Newbold, Carrie. "Electrode tissue interface : development and findings of an in vitro model /." Connect to thesis, 2006. http://repository.unimelb.edu.au/10187/1692.
Abel, Julia Catherine. "Investigation of the electrode/electrolyte interface using ultra fast electrochemical ellipsometry." Thesis, University of Newcastle Upon Tyne, 2001. http://hdl.handle.net/10443/799.
Lowry, R. B. "A surface enhanced raman spectroscopic study of the electrode/electrolyte interface." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233016.
Hanekom, Tania. "Modelling of the electrode-auditory nerve fibre interface in cochlear prosthesis." Pretoria : [s.n.], 2001. http://upetd.up.ac.za/thesis/available/etd-09052001-132021.
Sahar, Abdallah. "Etude par analyse spectrale de processus aux electrodes fortement aleatoires." Paris 6, 1988. http://www.theses.fr/1988PA066522.
Walker, Rachel Claire. "In-situ spectroscopic studies of electrocatalytic electrodes." Thesis, University of Bath, 1998. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284347.
Mansour, Diaa-Eldin A., Hiroaki Kojima, Naoki Hayakawa, Fumihiro Endo, and Hitoshi Okubo. "Partial discharge detection at delamination of electrode/epoxy interface in GIS spacers." IEEE, 2009. http://hdl.handle.net/2237/13943.
Kaiser, Odett [Verfasser]. "Cell-based drug delivery to optimise the electrode-nerve interface / Odett Kaiser." Hannover : Bibliothek der Tierärztlichen Hochschule Hannover, 2013. http://d-nb.info/1046715577/34.
Zhang, Di, and 张笛. "Transparent electrode design and interface engineering for high performance organic solar cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/202360.
published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
Thakore, Vaibhav. "Nonlinear dynamic modeling, simulation and characterization of the mesoscale neuron-electrode interface." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5529.
Ph.D.
Doctorate
Physics
Sciences
Physics
Gallagher, Mark Edward. "In-situ synchrotron X-ray scattering studies of the electrode / electrolyte interface." Thesis, University of Liverpool, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415746.
Kusachi, Yuki. "Improvement of lithium-ion battery performance by control of electrode electrolyte interface." Kyoto University, 2020. http://hdl.handle.net/2433/253383.
0048
新制・課程博士
博士(人間・環境学)
甲第22547号
人博第950号
新制||人||226(附属図書館)
2019||人博||950(吉田南総合図書館)
京都大学大学院人間・環境学研究科相関環境学専攻
(主査)教授 内本 喜晴, 教授 吉田 寿雄, 准教授 戸﨑 充男
学位規則第4条第1項該当
Maffre, Marion. "Électrolytes aqueux concentrés pour applications électrochimiques." Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTS088.
Concentrated aqueous electrolytes, called water-in-salt (WIS), have recently emerged as a new class of electrolytes. They permit to widen the electrochemical stability window of water, thermodynamically limited to 1.23 V. This is occurring because hydrogen reduction (HER) and oxygen oxidation (OER) reactions are shifted. They are currently attracting major interest for the trending development of aqueous rechargeable batteries.This thesis work focused on the factors causing the shift in the onset potential of the oxygen evolution reaction to more positive values with the increase of salt concentration. In order to reach this goal, theoretical and experimental studies were carried out. In a first part, the contribution of the decrease in the amount of free water on the shift of the water oxidation potential was investigated. For this, on one hand the effect of salt concentration on water activity was quantified. On the other hand, the impact of water activity on the Nernst potential of OER was determined. In a second part, the effect of water activity as well as the steric effect of anions on the OER potential was evaluated, using the Butler-Volmer equation. These two studies were realized by adapting the formalisms commonly used for conventional dilute electrolytes. In a third component, the chemical and electrochemical processes occurring in positive potentials were studied. All the work carried out has shown that water oxidation is not the only oxidation reaction occurring at a high positive potential. Moreover, it has been shown that the redox processes involved are complex and lead to the formation of a film on the surface of the positive electrode
Bihag, A. M. "Supported nanostructured materials with enhanced electrode-electrolyte interface for high performance supercapacitors and dye sensitized solar cell counter electrodes." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2015. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/1997.
Carvallo, Pecci Andrés Nicolás. "Modèle biophysique pour la mesure de la conductivité cérébrale et apport diagnostique." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S039/document.
We aimed at providing an accurate estimation of human brain tissue electrical conductivity in clinico, using local, low-intensity pulsed stimulation. Methods: Using the quasi-static approximation of Maxwell equations, we derived an analytical model of the electric field generated by intracerebral stereotactic-EEG (SEEG) electrodes. We coupled this electric field model with a model of the electrode-electrolyte interface to provide an explicit, analytical expression of brain tissue conductivity based on the recorded brain tissue response to pulse stimulation. Results: We validated our biophysical model using: i) saline solutions calibrated in electrical conductivity, ii) rat brain tissue, and iii) electrophysiological data recorded in clinico from two epileptic patients during SEEG. Conclusion: This new model-based method offers a fast and reliable estimation of brain tissue electrical conductivity by accounting for contributions from the electrode-electrolyte interface. Significance: This method outperforms standard bioimpedance measurements since it provides absolute (as opposed to relative) changes in brain tissue conductivity. Application for diagnosis is envisioned since conductivity values strongly differ when estimated in the healthy vs. hyperexcitable brain tissue
Lempka, Scott Francis. "The electrode-tissue interface during record and stimulation in the central nervous system." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1270107550.
Mansour, D. A., H. Kojima, N. Hayakawa, F. Endo, and H. Okubo. "Partial Discharge Characteristics for Small Gap of Electrode/Epoxy Interface in SF6 Gas." IEEE, 2008. http://hdl.handle.net/2237/12127.
Lempka, Scott Francis. "The Electrode-Tissue Interface during Recording and Stimulation in the Central Nervous System." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1270107550.
Dai, Yifan. "ENGINEERING THE BIO-ELECTRODE INTERFACE FOR ELECTROCHEMICAL BIOSENSORS WITH SENSITIVITY, ACCURACY AND SIMPLICITY." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1587470062118459.
Yada, Chihiro. "Studies on electrode/solid electrolyte interface of all-solid-state rechargeable lithium batteries." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/144024.
0048
新制・課程博士
博士(工学)
甲第12338号
工博第2667号
新制||工||1377(附属図書館)
24174
UT51-2006-J330
京都大学大学院工学研究科物質エネルギー化学専攻
(主査)教授 小久見 善八, 教授 江口 浩一, 教授 田中 功
学位規則第4条第1項該当
MacDonald, Gordon Alex. "Nanoscale Characterization of the Electrical Properties of Oxide Electrodes at the Organic Semiconductor-Oxide Electrode Interface in Organic Solar Cells." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/347338.
Greenbank, William. "Interfacial stability and degradation in organic photovoltaic solar cells." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0338/document.
Organic photovoltaic (OPV) solar cells show great promise but suffer from short operating lifetimes. This study examines the role that the selection of materials for the hole extraction interface in inverted OPV devices plays in determining the lifetime of a device. In the first part of the study, the effects of thermal degradation were examined. It was found that devices containing MoO3 HTLs and silver top electrodes exhibit an open-circuit voltage (VOC)/fill factor (FF)-driven mechanism. Physical characterisation experiments showed that, with heating, the silver electrode undergoes de-wetting. With thin electrodes this can result in the catastrophic failure of the device. A fracture analysis study found that silver-containing devices experience an increase in adhesion of their top layers to the active layer due to interdiffusion between the layers. This interdiffusion may be related to the loss of VOC and FF in Ag/MoO3 devices through diffused species forming charge traps in the active layer. In the second part of the study, the effects of photodegradation in different atmospheres were studied. Some material-dependent effects were observed when the devices were aged in an inert atmosphere, including variations in projected lifetime. The effect of oxygen was to greatly accelerate degradation, and remove any of the material-dependence observed in the inert experiment, while humidity led to a substantial increase in the degradation rate of devices containing PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate). This study underlines the importance of considering device lifetime in device design, and choosing materials to minimise degradation
Santoro, Francesca [Verfasser]. "3D Nanoelectrodes for Bioelectronics: Design and Characterization of the Cell-Electrode Interface / Francesca Santoro." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1058850830/34.
Okubo, Hitoshi, Masafumi Takei, Yoshikazu Hoshina, Masahiro Hanai, Katsumi Kato, and Muneaki Kurimoto. "Application of Functionally Graded Material for Reducing Electric Field on Electrode and Spacer Interface." IEEE, 2010. http://hdl.handle.net/2237/14528.
Jintana, Eamaeim. "The application of Fourier transform infrared to the study of the electrode/electrolyte interface." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364846.
Taji, Bahareh. "Reconstruction of ECG Signals Acquired with Conductive Textile Eletrodes." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/26303.
Basly, Jean-Philippe. "Caracterisation de inp par des methodes electrochimiques : spectroscopie d'impedance et methodes potentiostatiques." Caen, 1988. http://www.theses.fr/1988CAEN2002.
Yamate, Shigeki. "Studies on Effects of Solid Electrolyte Interface on Negative Electrode Properties for Lithium-ion Batteries." Kyoto University, 2017. http://hdl.handle.net/2433/225963.
Tsubouchi, Shigetaka. "Study on Interfacial Reaction between Graphite Negative Electrode and Electrolyte Solution in Lithium-Ion Battery." Kyoto University, 2018. http://hdl.handle.net/2433/232047.
Srinivasan, Akhil. "The Georgia Tech regenerative electrode - A peripheral nerve interface for enabling robotic limb control using thought." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53911.
Segura, Carlos Alejandro. "Development of an optrode for characterization of tissue optical properties at the neural tissue-electrode interface." Thesis, Boston University, 2014. https://hdl.handle.net/2144/21118.
The use of implantable neural probes has become common, both for stimulation and recording, and their applications range from chronic pain treatment to implementation of brain machine interfaces (BMI). Studies have shown that signal quality of implanted electrodes decays over time mainly due to the immune response. Characterization of the tissue-electrode interface is critical for better understanding of the physiological dynamics and potential performance improvement of the electrode itself and its task. This work describes the fabrication of an implantable electrode with optical measurement capabilities for providing means to characterize the tissue-electrode interface using optical spectroscopy. The electrode has a set of waveguides embedded in its shanks, which are used to inject white light into tissue and then collect the light reflected from the tissue surrounding the shanks. The collected light was analyzed with a spectrometer and the spectra processed to detect changes in optical properties, information that allows to track physiological changes. It is believed that the immune response can be correlated to changes in scattering as more cells are recruited to the injury site. The increased cell density in local injury/implantation sites increases the amount of scattering due to the increased number of cell nuclei and membranes that light encounters in its path. Investigation of scattering and absorption coefficients in such interface and their change over time can provide useful data for modeling and determining physiological parameters like blood oxygenation while the actual shape of the acquired spectra might highlight particular phenomena that can be indicative of scaring process or hemorrhaging. Validation of this system was done using optical phantoms based on polystyrene spheres and solutions with various concentrations of fat emulsion, which yielded scattering coefficients similar to those of brain tissue. Results suggest that the developed optrodes are able to detect differences between samples with different scattering coefficients. Improvements of fabrication process are discussed based on experimental results and future work includes attempting to perform fluorescence measurements of voltage reporters for optogenetic applications. The ultimate goal of this project was to create a novel device that is capable of satisfying the unmet need of tissue characterization at the implanted electrode interface as well as a tool for the optogenetics field suitable for greater depths than those a microscope can achieve.
Okubo, Hitoshi, Diaa-Eldin A. Mansour, Hiroki Kojima, Naoki Hayakawa, and Fumihiro Endo. "Surface charge accumulation and partial discharge activity for small gaps of electrode/epoxy interface in sf6 gas." IEEE, 2009. http://hdl.handle.net/2237/13944.
Konno, Akio. "Novel Performance Enhancement Method by Mesoscale-Structure Control of Electrode-Electrolyte Interface in Solid Oxide Fuel Cells." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142566.
Eriksson, Tom. "LiMn2O4 as a Li-ion Battery Cathode. From Bulk to Electrolyte Interface." Doctoral thesis, Uppsala universitet, Institutionen för materialkemi, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1397.
Yu, Yongyue. "Advanced carbon electrode and green solvents for fabrication of metal halide perovskite solar cells." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/236550/2/Yongyue%2BYu%2BThesis%283%29.pdf.
Schiefer, Matthew Anthony. "Optimized Design of Neural Interfaces for Femoral Nerve Clinical Neuroprostheses: Anatomically-Based Modeling and Intraoperative Evaluation." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1237683232.
Cochet, Jean-Marc. "Etude voltamperometrique des graphites noirs de carbone et charbons actives : application a l'etude des superconducteurs." Paris 6, 1988. http://www.theses.fr/1988PA066154.
Okubo, Hitoshi, Diaa-Eldin A. Mansour, Hiroki Kojima, Naoki Hayakawa, and Fumihiro Endo. "Influence of accumulated surface charges on partial discharge activity at micro gap delamination in epoxy GIS spacer." IEEE, 2009. http://hdl.handle.net/2237/13942.
Agel, Eric. "Electrode à air électrolyte solide polymère alcalin pour piles à combustible et générateur métal-air." Paris 7, 2002. http://www.theses.fr/2002PA077002.