Bibliographies thématiques / Electrodic surfaces

Littérature scientifique sur le sujet « Electrodic surfaces »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Electrodic surfaces"

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Slater, Lee, Dimitrios Ntarlagiannis, Nathan Yee, Michael O’Brien, Chi Zhang et Kenneth H. Williams. « Electrodic voltages in the presence of dissolved sulfide : Implications for monitoring natural microbial activity ». GEOPHYSICS 73, no 2 (mars 2008) : F65—F70. http://dx.doi.org/10.1190/1.2828977.

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There is growing interest in the development of new monitoring strategies for obtaining spatially extensive data diagnostic of microbial processes occurring in the earth. Open-circuit potentials arising from variable redox conditions in the fluid local-to-electrode surfaces (electrodic potentials) were recorded for a pair of silver-silver chloride electrodes in a column experiment, whereby a natural wetland soil containing a known community of sulfate reducers was continuously fed with a sulfate-rich nutrient medium. Measurements were made between five electrodes equally spaced along the column and a reference electrode placed on the column inflow. The presence of a sulfate reducing microbial population, coupled with observations of decreasing sulfate levels, formation of black precipitate (likely iron sulfide),elevated solid phase sulfide, and a characteristic sulfurous smell, suggest microbial-driven sulfate reduction (sulfide generation) in our column. Based on the known sensitivity of a silver electrode to dissolved sulfide concentration, we interpret the electrodic potentials approaching [Formula: see text] recorded in this experiment as an indicator of the bisulfide [Formula: see text] concentration gradients in the column. The measurement of the spatial and temporal variation in these electrodic potentials provides a simple and rapid method for monitoring patterns of relative [Formula: see text] concentration that are indicative of the activity of sulfate-reducing bacteria. Our measurements have implications both for the autonomous monitoring of anaerobic microbial processes in the subsurface and the performance of self-potential electrodes, where it is critical to isolate, and perhaps quantify, electrochemical interfaces contributing to observed potentials.
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Barrientos, C., R. Moscoso, S. Moris et J. A. Squella. « Electrochemical Study of Butyl-Pyrene Nitrobenzoate Derivatives Trapped on MWCNT Nanostructured Electrodes ». Journal of The Electrochemical Society 168, no 12 (1 décembre 2021) : 126515. http://dx.doi.org/10.1149/1945-7111/ac3ff5.

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In the scope of our studies tending to find new nanostructured electrodic platforms containing nitroaromatic compounds (NACs) capable of generating in situ electrocatalytic redox couples, we synthesized and electrochemically studied three related 4-(pyren-1-yl)-butyl-substituted nitrobenzoates (2-NBPy, 3-NBPy and 4-NBPy). The design of the compounds is based on a combination of a) an adsorptive tail (-butyl-pyrene) capable of interacting via π–π stacking with the MWCNT nanostructured electrodes and b) nitroaromatic compounds (NACs) capable of electrochemically activating to form a RNHOH/NO redox couple trapped on the nanostructured electrodic platform. Morphological and structural analyses of the nanostructured interfaces were performed by SEM and WAXS/SAXS analysis. All of the NBPy compounds trapped on the nanostructured electrodic platform were susceptible to reduction, generating the corresponding hydroxylamine derivative. The order of ease of reduction for the nitrocompounds is 4-NBPy > 2-NBPy > 3-NBPy. After electrochemical activation, all compounds generated an RNHOH/NO redox mediator couple with the following order of stability of the mediator couple: 2-NBPy > 3-NBPy > 4-NBPy. For the 2-NBPy and 3-NBPy derivatives, excellent stability of the couple was observed, and a decrease in the peak current of 6% was observed after 60 min.
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Torsi, L. « An infra-red study of the interaction between thin polybithiophene films and Pt electrodic surfaces ». Synthetic Metals 41, no 1-2 (avril 1991) : 575–78. http://dx.doi.org/10.1016/0379-6779(91)91136-x.

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Spanu, Davide, Gilberto Binda, Marcello Marelli, Laura Rampazzi, Sandro Recchia et Damiano Monticelli. « Quantitative Determination of the Surface Distribution of Supported Metal Nanoparticles : A Laser Ablation–ICP–MS Based Approach ». Chemosensors 9, no 4 (10 avril 2021) : 77. http://dx.doi.org/10.3390/chemosensors9040077.

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A laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) based method is proposed for the quantitative determination of the spatial distribution of metal nanoparticles (NPs) supported on planar substrates. The surface is sampled using tailored ablation patterns and the data are used to define three-dimensional functions describing the spatial distribution of NPs. The volume integrals of such interpolated surfaces are calibrated to obtain the mass distribution of Ag NPs by correlation with the total mass of metal as determined by metal extraction and ICP–MS analysis. Once this mass calibration is carried out on a sacrificial sample, quantifications can be performed over multiple samples by a simple micro-destructive LA–ICP–MS analysis without requiring the extraction/dissolution of metal NPs. The proposed approach is here tested using a model sample consisting of a low-density polyethylene (LDPE) disk decorated with silver NPs, achieving high spatial resolution over cm2-sized samples and very high sensitivity. The developed method is accordingly a useful analytical tool for applications requiring both the total mass and the spatial distribution of metal NPs to be determined without damaging the sample surface (e.g., composite functional materials and NPs, decorated catalysts or electrodic materials).
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Hou, Wei, Qingwei Liao, Shuang Xie, Yujun Song et Lei Qin. « Prospects and Challenges of Flexible Stretchable Electrodes for Electronics ». Coatings 12, no 5 (20 avril 2022) : 558. http://dx.doi.org/10.3390/coatings12050558.

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The application of flexible electronics in the field of communication has made the transition from rigid physical form to flexible physical form. Flexible electrode technology is the key to the wide application of flexible electronics. However, flexible electrodes will break when large deformation occurs, failing flexible electronics. It restricts the further development of flexible electronic technology. Flexible stretchable electrodes are a hot research topic to solve the problem that flexible electrodes cannot withstand large deformation. Flexible stretchable electrode materials have excellent electrical conductivity, while retaining excellent mechanical properties in case of large deformation. This paper summarizes the research results of flexible stretchable electrodes from three aspects: material, process, and structure, as well as the prospects for future development.
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Karpenko, O. S., V. V. Lobanov et M. T. Kartel. « C1s core-level binding energy shift dependence from carbon atoms position in graphenenanoflakes C96 and polycyclic aromatic hydrocarbon C96H24 : a dft study ». SURFACE 14(29) (30 décembre 2022) : 63–77. http://dx.doi.org/10.15407/surface.2022.14.063.

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The hexagon-shape graphene nanoflakes (GNFs) limited by zigzag edges only (with doubly and triply coordinated atoms) have unique increased reactivity. Despite the high systems symmetry (D6h) the Carbon atoms in GNFs occupy non-equivalent positions. Can such physical and chemical characteristics of GNFs, which depend of the atom position in the cluster, definition? This characteristic together with the simplicity of its calculation makes it possible to predict the properties of nanoflakes obtained from GNFs by introducing single and multiatomic vacancies into them or by replacing Carbon atoms with electron withdrawing and electron donating atoms. This characteristic includes the C1s core-level binding energy shifts, the maxima of which characterize the C atoms of a certain type. The proposed work is devoted to quantum chemical calculations of the electronic density of states (DOS) of pristine hexagon-shape GNF C96 (multiplicity, M=5), their saturated counterpart –polycyclic aromatic hydrocarbon(PAH) C96H24 (M=1) and their derivatives with one and two single vacancies in the ground electronic state (GES). All calculations were performed using the density functional theory (DFT) method with the involvement of the valence-split basis set 6-31G (d,p). Systems with open shells were considered using the UB3LYP exchange-correlation functional. The obtained spectra were fitted using Gaussian curve fitting program to determine the binding energy for each peak. The Gaussian function distribution of the theoretically calculated C1s core-level binding energy shifts of GNFs testified the presence of six peaks, each of which refers to a certain type of Carbon atoms. The C1s peak with the highest binding energy (-285.57 eV) is caused by contributions from the doubly coordinated edge cyclic chain (ECC) Carbon atoms. The C1s orbitals of the central hexagon (CHex) atoms and the first cyclic chain (FCC) atoms form delocalized molecular orbitals (MOs) in different parts of the cluster. The analogous spectrum of PAH C96H24 is slightly shifted to the region of lower binding energies and contains only two well-defined peaks. The peak with a higher binding energy (-284.36 eV) is generated by the 1s states of the CHex atoms and the atoms of the FCC, which are bounded to the CHex atoms. The electronic DOS difference in C1s core-level spectra of GNF C96 (M=5) and their saturated counterpart PAH C96H24 is established due to the presence of two weakly bounded π-systems in GNF and common conjugated system in PAH. The electronic DOS of defect-containing cluster C96-1(1) (M=3) (one CHex atom has been removed from the C96nanoflake) is generated by the C1s core-level atoms of the second cyclic chain (SCC), which are located at the different distances from the center of the nanoflake. The peak of the lowest intensity (-284.63 eV) appears in the spectrum as a reflection of the appearance of doubly coordinated Carbon atoms surrounding the single vacancy in the C96-1(1) nanoflake. The analysis of the electronic DOS of the C1s core-level spectrum of the C96-2(1) nanoflakeis shown, that doubly coordinated Carbon atoms, concentrated around two single vacancies, are essentially non-equivalent. If the MO with the lowest binding energy is localized on two of them – the MO with the highest binding energy is localized on the third atoms (one around each single vacancy). The electronic C1s core-level DOS spectrum of defect-containing molecular systems with one C96-1(1)H24 and two C96‑2(1)H24 single vacancies are similar to the analogous spectrum of PAH C96H24. In the first of them – one additional maximum appears due to C1s atoms surrounding the single vacancy. In the second – there are two additional maxima, each of which is generated by C1s core-level atoms adjacent to individual vacancies.
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Terebinska, M. I., O. I. Tkachuk, A. M. Datsyuk, O. V. Filonenko et V. V. Lobanov. « Electronic structure of complexes of oligomers of 3,4-ethylene-dietoxythiophene with polystyrlesulphonic acid ». Surface 13(28) (30 décembre 2021) : 84–93. http://dx.doi.org/10.15407/surface.2021.13.084.

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By the method of density functional theory (B3LYP, 6-31G **) the electronic structures of poly 3,4-ethylenedioxythiophene containing 12 links in charge states 0, +1, +2, +3 and +4 were calculated. It is shown that the oligomer of 12 units is sufficient to reflect the properties of the conductive polymer. To estimate the probability of electron density movement along the polymer chain, the width of the energy gap between NOMO and LUMO was calculated. It is shown that the molecules of oligomers EDOT and SS do not remain parallel to each other after polymerization, but rather, with increasing chain length, the latter gradually bends around the anionic unit SS; the charge distribution in the EDOT and SS oligomer complexes indicates the presence of two separated polarons at the two ends of the chain, and the asymmetry in the charge distribution also implies the presence of a curved spiral structure of the formed complex.
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Han, Qing, Ge Ming Liu, Niu Sheng Peng, Tao Feng, Jin Feng Xia et Jin Xia. « Preparation and Characterization of Pt/YSZ Electrode of Zirconia Oxygen Sensor ». Key Engineering Materials 544 (mars 2013) : 72–75. http://dx.doi.org/10.4028/www.scientific.net/kem.544.72.

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Electrode slurry made of Pt powder was brushed on both surfaces of the sintered ZrO2 substrate. And then the Pt electrodes were sintered under various temperatures. The microstructure of the surface of the electrodes was characterized by scanning electronic microscope. The electrochemical properties of the electrodes were investigated by electrochemical impedance spectroscopy (EIS). The results show that the sintered temperature of the electrode has a remarkable effect on the microstructure of the electrode and the Pt electrode show favorable electrochemical catalysis performance.
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Zolotarenko, Ol D., E. P. Rudakova, N. Y. Akhanova, M. Ualkhanova, An D. Zolotarenko, D. V. Shchur, M. T. Gabdullin et al. « Synthesis of carbon nanostructures using cheap grades of graphite ». SURFACE 14(29) (30 décembre 2022) : 113–31. http://dx.doi.org/10.15407/surface.2022.14.113.

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In the work, carbon nanostructures (CNS) were synthesized on a plasma chemical plant using graphite electrodes SIGE (Special Impregnated Graphite Electrodes) and FGDG-7 (Fine-grained dense graphite) in a helium environment. In the experiments, it was established that graphite electrodes of the SIGE brand are suitable for the synthesis of CNS by the electric arc plasma chemical method. In addition, the experiments indicate that SIGE graphite in electric arc synthesis in a gas environment allows the creation of centimeter composite rods (deposits), where the core consists of graphene sheets rolled into nanotubes that can withstand extremely high temperatures (>4000 K). Studies using scanning microscopy have shown that the synthetic deposit of SIGE graphite can be divided into blocks, which is important for its use in high voltage stations because it is possible to prepare deposits of the required length without mechanical impact and without violating the integrity of its structure. The structure of the synthesized carbon materials was studied by scanning and transmission electron microscopy and it was shown that carbon nanotubes are formed during the evaporation of SIGE brand graphite even without the use of a catalyst. Experiments have confirmed that the mass yield of wall fullerene-containing carbon black during the evaporation of SIGE grade graphite significantly exceeds the results obtained during the evaporation of FGDG-7 grade graphite electrodes. Such results make SIGE graphite more productive for the synthesis of expensive carbon nanoproducts (fullerenes and fullerene-like structures) by the electric arc method. It was also recorded that during the synthesis of carbon nanostructures, single-walled carbon nanotubes are formed, which have a positive charge and are deposited in the form of a core on the surface of the cathode electrode under the action of an electromagnetic field.
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Zhang, Tian, Zhongyun Ma, Linjun Wang, Jinyang Xi et Zhigang Shuai. « Interface electronic structures of reversible double-docking self-assembled monolayers on an Au(111) surface ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 372, no 2013 (13 avril 2014) : 20130018. http://dx.doi.org/10.1098/rsta.2013.0018.

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Double-docking self-assembled monolayers (DDSAMs), namely self-assembled monolayers (SAMs) formed by molecules possessing two docking groups, provide great flexibility to tune the work function of metal electrodes and the tunnelling barrier between metal electrodes and the SAMs, and thus offer promising applications in both organic and molecular electronics. Based on the dispersion-corrected density functional theory (DFT) in comparison with conventional DFT, we carry out a systematic investigation on the dual configurations of a series of DDSAMs on an Au(111) surface. Through analysing the interface electronic structures, we obtain the relationship between single molecular properties and the SAM-induced work-function modification as well as the level alignment between the metal Fermi level and molecular frontier states. The two possible conformations of one type of DDSAM on a metal surface reveal a strong difference in the work-function modification and the electron/hole tunnelling barriers. Fermi-level pinning is found to be a key factor to understand the interface electronic properties.
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Thèses sur le sujet "Electrodic surfaces"

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Lau, Chi Hian. « Chemical, electronic and electrochemical properties of diamond thin films ». Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:53a0886c-14ad-431a-975d-0ecca8fc8968.

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Diamond is of interest as an advanced functional material, since the extreme physical properties of diamond, suggests it is ideally suited to a range of new demanding applications. In this context, the thesis explores basic surface chemical properties of diamond thin films, along with electrochemical, electronic and electron emission processes involving this material. New experiments are reported concerning the nature of surface conductivity on diamond. Measurements clearly show that the conductivity only arises if a hydrogenated diamond surface is exposed to water vapour, in the presence of chemical species capable of acting as electron acceptors. The conduction properties of surface conductive diamond in aqueous solution are also studied, and the first detailed electrochemical investigations of this material are described. Comparative electrochemical studies of nanocrystalline and boron-doped diamond have been performed. Investigations of electrode stability, and the accessible "potential window" are described, as well as the behaviour of a range of 'redox' systems, including transition metal complexes, metal deposition/stripping, and bio-related organic species. Significant differences between the behaviour of nanodiamond and microcrystalline boron-doped material are observed. A range of surface chemical and threshold photoemission studies of diamond thin films are reported. The results indicate that quantum photoyields (QPYs) are insensitive to the diamond "quality", although the wavelength selectivity is dependent on it. The adsorption of oxygen strongly reduces the QPY, although this only occurs slowly in the presence of O2 because of a low reactive sticking probability. Much more rapid uptake of oxygen and consequent reduction of photoyield is observed in the presence of atomic O or electronically excited dioxygen O2*. The presence of alkali metals on the diamond surface increases the QPY, and reduces the sensitivity of the QPY to surface oxygen. Significant differences between the surface chemical properties of Li, and other adsorbed akali metals (K and Cs) are observed.
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Akinbulu, Isaac Adebayo. « Surface properties and electrocatalytic applications of metallophthalocyanines confined on electrode surfaces ». Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1005030.

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New cobalt (13, 16 19 and 22), manganese (14, 17, 20 and 23) and iron (15, 18, 21 and 24)phthalocyanine complexes were synthesized and characterized. The UV-Vis spectral properties of the complexes were typical of the nature of central metal and position of substituent on the Pc ligand. Their electrochemical behaviors were signatures of the central metals, with varying influences of the nature and position of substituents. Nanocomposite of complex 18 and single walled carbon nanotubes (SWCNTs) (SWCNT-18)was fabricated. Formation of this nano-composite was confirmed by infrared (IR)spectroscopy, X-ray diffraction (XRD) spectroscopy and transmission electron microscopy (TEM). Self-assembled monolayers (SAMs) of SWCNT-18, complexes 13-15, and 20 were electropolymerized on glassy carbon electrodes (GCE). Complex 14 was also electrodeposited on GCE. Surface properties of the SAMs were consistent with the molecular feature of the substituent and the nature of central metal in the adsorbed species, while those of the MnPc modified GCEs were dependent on point of substitution and number of substituent. The SAM-modified gold electrodes were used for the electrocatalytic oxidation of the carbamate insecticide, carbofuran. Amplification of the current signal of the insecticide, at more energetically feasible oxidation potentials, on the SAM-modified gold electrodes, relative to bare gold electrode,justified electrocatalysis. There was enhanced sensitivity (attributed to the presence of SWCNT) of the SWCNT-18-SAM-modified gold electrode towards carbofuran, relative to the signals observed on the other SAMs. Current response of the insecticide,bendiocarb, was also intensified, at more favorable oxidation potentials, on the MnPc (14 and 17) modified GCEs, relative to the response on bare GCE, substantiating electrocatalysis. Also, catalysis of the oxidation of the herbicide, bentazon, was observed on polymeric film of complex 20. The current response of the herbicide on this film was better than that observed on bare GCE. Electrocatalysis of the analytes, on the respective modified electrodes, occurred via closely related mechanisms.
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Wilks, Justin. « Free Radical Chemistries at the Surface of Electronic Materials ». Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc31552/.

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The focus of the following research was to (1) understand the chemistry involved in nitriding an organosilicate glass substrate prior to tantalum deposition, as well as the effect nitrogen incorporation plays on subsequent tantalum deposition and (2) the reduction of a native oxide, the removal of surface contaminants, and the etching of a HgCdTe surface utilizing atomic hydrogen. These studies were investigated utilizing XPS, TEM and AFM. XPS data show that bombardment of an OSG substrate with NH3 and Ar ions results in the removal of carbon species and the incorporation of nitrogen into the surface. Tantalum deposition onto a nitrided OSG surface results in the initial formation of tantalum nitride with continued deposition resulting in the formation of tantalum. This process is a direct method for forming a thin TaN/Ta bilayer for use in micro- and nanoelectronic devices. Exposure to atomic hydrogen is shown to increase the surface roughness of both air exposed and etched samples. XPS results indicate that atomic hydrogen reduces tellurium oxide observed on air exposed samples via first-order kinetics. The removal of surface contaminants is an important step prior to continued device fabrication for optimum device performance. It is shown here that atomic hydrogen effectively removes adsorbed chlorine from the HgCdTe surface.
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Lotfollahi, Ramin. « Electronic structure of surfaces ». Thesis, Örebro University, Institutionen för naturvetenskap Department of Natural Sciences, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-640.

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For an idealized one-dimensional crystal it is possible to have energy levels whose wave functions are localized at the surface. These states are called surface states. There is one surface state for each energy gap between the ordinary allowed bands of energies. These electron states are called Tamm states. This Tamm state has an energy that lies almost at the middle of the energy gap and is mainly localized at the surface atomic layer. The image potential states are generated by a potential well formed by the Coulomb-like image potential barrier. These image states that are also called Shockley states are localized in a slowly decaying tail in the vacuum.

I also studied the lateral (in-plane) motion of electrons confined to terraces between steps on a vicinal Cu (111) surface. The local density of states showed a number of peaks at energies where electrons can occupy new quantum-well states on a step. I also tested the influence of the electron lifetime on the local density of states.

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Xiu, Yonghao. « Fabrication of surface micro- and nanostructures for superhydrophobic surfaces in electric and electronic applications ». Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26641.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Hess, Dennis W.; Committee Chair: Wong, C. P.; Committee Member: Breedveld, Victor; Committee Member: Koros, William J.; Committee Member: Meredith, Carson; Committee Member: Nair, Sankar. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Feng, Yongjia. « First principles studies of transition metal surfaces : the effect of an external field on surface electronic properties and surface energetics / ». View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202003%20FENG.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 106-110). Also available in electronic version. Access restricted to campus users.
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Plachinda, Pavel. « Electronic Properties and Structure of Functionalized Graphene ». PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/585.

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The trend over the last 50 years of down-scaling the silicon transistor to achieve faster computations has led to doubling of the number of transistors and computation speed over about every two years. However, this trend cannot be maintained due to the fundamental limitations of silicon as the main material for the semiconducting industry. Therefore, there is an active search for exploration of alternate materials. Among the possible candidates that can may [sic] be able to replace silicon is graphene which has recently gained the most attention. Unique properties of graphene include exceedingly high carrier mobility, tunable band gap, huge optical density of a monolayer, anomalous quantum Hall effect, and many others. To be suitable for microelectronic applications the material should be semiconductive, i.e. have a non-zero band gap. Pristine graphene is a semimetal, but by the virtue of doping the graphene surface with different molecules and radicals a band gap can be opened. Because the electronic properties of all materials are intimately related to their atomic structure, characterization of molecular and electronic structure of functionalizing groups is of high interest. The ab-inito (from the first principles) calculations provide a unique opportunity to study the influence of the dopants and thus allow exploration of the physical phenomena in functionalized graphene structures. This ability paves the road to probe the properties based on the intuitive structural information only. A great advantage of this approach lies in the opportunity for quick screening of various atomic structures. We conducted a series of ab-inito investigations of graphene functionalized with covalently and hapticly bound groups, and demonstrated possible practical usage of functionalized graphene for microelectronic and optical applications. This investigation showed that it is possible [to] produce band gaps in graphene (i.e., produce semiconducting graphene) of about 1 eV, without degrading the carrier mobility. This was archived by considering the influence of those adducts on electronic band structure and conductivity properties.
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Genua, Maria. « Combinatorial surface-based electronic tongue development : Analytical applications and conception of 2D and 3D biomimetic surfaces ». Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI044/document.

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L'objectif de cette thèse est le développement d'une langue électronique avec une méthode simplifiée d'obtention de récepteurs à réactivité croisée. Ces récepteurs sont préparés par une approche combinatoire novatrice qui consiste au mélange et à l'auto-assemblage de deux disaccharides. Le couplage de ces récepteurs avec un système de détection d'imagerie par résonance des plasmons de surface nous a permis de réaliser une langue électronique capable de différencier des échantillons de différentes complexités, y compris des protéines pures et des mélanges complexes. Cela se fait grâce aux profils et images d'évolution continue, assimilés à des « empreintes digitales » des échantillons. D'un autre côté, ce système peut être utilisé en tant qu'outil pour la conception de surfaces biomimétiques 2D et 3D. Ce système est prometteur pour l'étude des interactions sucre-protéine et pour la préparation de nanovecteurs biomimétiques qui ciblent de façon spécifique des protéines d'intérêt
L'objectif de cette thèse est le développement d'une langue électronique avec une méthode simplifiée d'obtention de récepteurs à réactivité croisée. Ces récepteurs sont préparés par une approche combinatoire novatrice qui consiste au mélange et à l'auto-assemblage de deux disaccharides. Le couplage de ces récepteurs avec un système de détection d'imagerie par résonance des plasmons de surface nous a permis de réaliser une langue électronique capable de différencier des échantillons de différentes complexités, y compris des protéines pures et des mélanges complexes. Cela se fait grâce aux profils et images d'évolution continue, assimilés à des « empreintes digitales » des échantillons. D'un autre côté, ce système peut être utilisé en tant qu'outil pour la conception de surfaces biomimétiques 2D et 3D. Ce système est prometteur pour l'étude des interactions sucre-protéine et pour la préparation de nanovecteurs biomimétiques qui ciblent de façon spécifique des protéines d'intérêt
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Merrick, Ian. « Embedding at electrode surfaces ». Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/55969/.

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Electronic structure calculations are performed on metal surfaces using an embedding method. Firstly, Cu and Ni surfaces with adsorbates are studied. The O/Cu(00T) reconstruction is investigated, and it is found that atomic displacements increase bonding symmetry and is most likely the cause of reconstruction. The interaction between a single graphitic layer and the Ni(III) substrate is also studied, and it is found that interacting states are formed at Ni band gaps. The remainder of the thesis deals with steps on metal surfaces. First, the jellium model is used to calculate the work function dependence on step density. In the low step density limit, the work function varies linearly with step density. Further calculations are performed on realistic Pd and Pt surfaces. When electric fields are applied, the screening charge of stepped surfaces is mostly located at the step edge. This is explained by the increased fields associated with the edge. Field emission from Pd and Pt surfaces is also studied. It is found that Pd is a better emitter than Pt, owing to work function effects. Transmission is dependent on the surface parallel wavevector and decreases with increasing wavevector. The reduced work function also plays a role at stepped surfaces, although the major influence stems from the reduced local work function at the step site. The low effective potential at the step provides a locally reduced barrier to electron removal. In addition, an increase in transmission is seen from non-zero wavevectors for stepped surfaces. The result is that stepped Pd and Pt surfaces, with a step density of one step in every three (001) unit cells, show field emission increased by a factor of four compared with the flat (001) surfaces.
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Cafe, Peter F. « Towards reliable contacts of molecular electronic devices to gold electrodes ». Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3870.

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SYNOPSIS OF THIS THESIS The aim of this thesis is to more fully understand and explain the binding mechanism of organic molecules to the Au(111) surface and to explore the conduction of such molecules. It consists of five discreet chapters connected to each other by the central theme of “The Single Molecule Device: Conductance and Binding”. There is a deliberate concentration on azine linkers, in particular those with a 1,10-phenanthroline-type bidentate configuration at each end. This linker unit is called a “molecular alligator clip” and is investigated as an alternative to the thiol linker unit more commonly used. Chapter 1 places the work in the broad context of Molecular Electronics and establishes the need for this research. In Chapter 2 the multiple break-junction technique (using a Scanning Tunnelling Microscope or similar device) was used to investigate the conductance of various molecules with azine linkers. A major finding of those experiments is that solvent interactions are a key factor in the conductance signal of particular molecules. Some solvents interfere with the molecule’s interaction with and attachment to the gold electrodes. One indicator of the degree of this interference is the extent of the enhancement or otherwise of the gold quantized conduction peak at 1.0 G0. Below 1.0 G0 a broad range for which the molecule enhances conduction indicates that solvent interactions contribute to a variety of structures which could bridge the electrodes, each with their own specific conductance value. The use of histograms with a Log10 scale for conductance proved useful for observing broad range features. vi Another factor which affects the conductance signal is the geometric alignment of the molecule (or the molecule-solvent structure) to the gold electrode, and the molecular alignment is explored in Chapters 3 for 1,10-phenanthroline (PHEN) and Chapter 4 for thiols. In Chapter 3 STM images, electrochemistry, and Density Functional Theory (DFT) are used to determine 1,10-phenanthroline (PHEN) structures on the Au(111) surface. It is established that PHEN binds in two modes, a physisorbed state and a chemisorbed state. The chemisorbed state is more stable and involves the extraction of gold from the bulk to form adatom-PHEN entities which are highly mobile on the gold surface. Surface pitting is viewed as evidential of the formation of the adatom-molecule entities. DFT calculations in this chapter were performed by Ante Bilic and Jeffery Reimers. The conclusions to Chapter 3 implicate the adatom as a binding mode of thiols to gold and this is explored in Chapter 4 by a timely review of nascent research in the field. The adatom motif is identified as the major binding structure for thiol terminated molecules to gold, using the explanation of surface pitting in Chapter 3 as major evidence and substantiated by emergent literature, both experimental and theoretical. Furthermore, the effect of this binding mode on conductance is explored and structures relevant to the break-junction experiment of Chapter 2 are identified and their conductance values compared. Finally, as a result of researching extensive reports of molecular conductance values, and having attempted the same, a simple method for predicting the conductance of single molecules is presented based upon the tunneling conductance formula.
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Livres sur le sujet "Electrodic surfaces"

1

Liebsch, Ansgar. Electronic excitations at metal surfaces. New York : Plenum Press, 1997.

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2

1949-, Soriaga Manuel P., American Chemical Society. Division of Colloid and Surface Chemistry. et American Chemical Society Meeting, dir. Electrochemical surface science : Molecular phenomena at electrode surfaces. Washington, DC : American Chemical Society, 1988.

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3

Jacek, Lipkowski, et Ross P. N, dir. Structure of electrified interfaces. New York, N.Y : VCH Publishers, 1993.

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Toyota Conference (10th 1996 Shizuoka-shi, Japan). TOYOTA-10 : Proceedings of the tenth TOYOTA Conference on atomic, molecular and electronic dynamic processes on solid surfaces, Shizuoka, Japan, November 5-8, 1996. Sous la direction de Aono Masamichi 1950- et Kawai Maki. Amsterdam : Elsevier Science, 1997.

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Toyota Conference (10th 1996 Shizuoka-shi, Japan). TOYOTA-10 : Proceedings of the tenth TOYOTA Conference on atomic, molecular and electronic dynamic processes on solid surfaces, Shizuoka, Japan, November 5-8, 1996. Sous la direction de Aono Masamichi 1950- et Kawai Maki. Amsterdam : Elsevier Science, 1997.

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Y, Andrei Eva, dir. Two-dimensional electron systems on helium and other cryogenic substrates. Dordrecht : Kluwer Academic Publishers, 1997.

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Electronic Properties of Surfaces. London : Taylor and Francis, 2017.

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J, Tersoff, Vanderbilt David et Vitek V, dir. Atomic scale calculations in materials science : Symposium held November 28-December 1, 1988, Boston, Massachusetts, U.S.A. Pittsburgh, Pa : Materials Research Society, 1989.

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E, Ilisca, et Makoshi K, dir. Electronic processes at solid surfaces. Singapore : World Scientific, 1994.

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E, Ilisca, et Makoshi K. 1948-, dir. Electronic processes at solid surfaces. Singapore : World Scientific, 1996.

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Chapitres de livres sur le sujet "Electrodic surfaces"

1

Shikler, R. « Electronic Surface Properties of Semiconductor Surfaces and Interfaces ». Dans Kelvin Probe Force Microscopy, 101–15. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22566-6_6.

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Lüth, Hans. « Electronic Surface States ». Dans Surfaces and Interfaces of Solids, 254–315. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-10159-9_6.

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Lüth, Hans. « Electronic Surface States ». Dans Graduate Texts in Physics, 253–335. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-10756-1_6.

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Ragan, Regina. « Surface Electronic Structure ». Dans Encyclopedia of Nanotechnology, 3896–907. Dordrecht : Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-9780-1_376.

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Lüth, Hans. « Electronic Surface States ». Dans Graduate Texts in Physics, 253–322. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13592-7_6.

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Lüth, Hans. « Electronic Surface States ». Dans Advanced Texts in Physics, 265–328. Berlin, Heidelberg : Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04352-3_6.

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Himpsel, F. J. « Surface Electronic States ». Dans Chemistry and Physics of Solid Surfaces VI, 435–53. Berlin, Heidelberg : Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82727-3_16.

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Zhu, Yimei, Hiromi Inada, Achim Hartschuh, Li Shi, Ada Della Pia, Giovanni Costantini, Amadeo L. Vázquez de Parga et al. « Surface Electronic Structure ». Dans Encyclopedia of Nanotechnology, 2555–65. Dordrecht : Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_376.

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Lüth, Hans. « Electronic Surface States ». Dans Surfaces and Interfaces of Solid Materials, 254–315. Berlin, Heidelberg : Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-662-03132-2_6.

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Bockris, John O’M, et Shahed U. M. Khan. « Phenomenological Electrode Kinetics ». Dans Surface Electrochemistry, 211–405. Boston, MA : Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-3040-4_3.

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Actes de conférences sur le sujet "Electrodic surfaces"

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Yeo, Woon-Hong, Yun-Soung Kim, Jongwoo Lee et John A. Rogers. « Multifunctional Skin-Like Electronics for Long-Term Health Monitoring ». Dans ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85698.

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Conductive gel-based wet electrodes along with the skin preparation have been widely used for the measurement of electrophysiological signals on the skin in a health monitoring system. The use of conductive gels is necessary to reduce the contact impedance between the skin surface and electrode. However, it can cause skin irritation or allergic reactions. This issue originates from the mismatch between the soft, curvy skin epidermis and the rigid, flat metal electrode. To address the issues of conventional electronics, we introduce a new class of ‘skin-like’ electronic system. The electronics can be conformally laminated on the epidermis, such that it ensures high-quality data recording without conductive gels. The skin-like electronics incorporates electrophysiological-, temperature-, and strain sensors in the system for multimodal functionality. To provide robust wearability for a week, a medical spray bandage is utilized to shield the sensor on the skin. The multifunctional sensor measures physiological signals and they are recorded with a commercial wireless data acquisition system along with a releasable, skin-like connector. This novel, multifunctional electronics on the skin can potentially replace the irritable and cumbersome wet electrodes for portable, long-term health monitoring at home.
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Delgadillo, I., H. Gollisch et R. Feder. « Electronic structure of 3d metals at finite temperatures ». Dans The 8th Latin American congress on surface science : Surfaces , vacuum, and their applications. AIP, 1996. http://dx.doi.org/10.1063/1.51147.

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Mata, G. J., et A. Noguera. « Electronic structure in the neighborhood of a disordered interface ». Dans The 8th Latin American congress on surface science : Surfaces , vacuum, and their applications. AIP, 1996. http://dx.doi.org/10.1063/1.51181.

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Gurevich, Yu G., G. Gonzalez de la Cruz et V. V. Prosentsov. « Electronic transport in thin semiconductor films of finite length in magnetic field ». Dans The 8th Latin American congress on surface science : Surfaces , vacuum, and their applications. AIP, 1996. http://dx.doi.org/10.1063/1.51141.

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Yablonovitch, Eli, et T. Gmitter. « Chemical Synthesis of Ideal Electronic Surfaces on Silicon and Other Semiconductors ». Dans Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C. : Optica Publishing Group, 1987. http://dx.doi.org/10.1364/msba.1987.ma2.

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In the past decade semiconductor surface science has successfully studied the electronic structure and reconstructions of totally bare semiconductor surfaces. Recently experimentalists have begun to assume a more active role1,2 in modifying surface chemical structures to passivate the surface, i.e., to render the surface states electronically inactive. We can expect that this work will evolve more and more toward the artificial synthesis of surface chemical-bonding structres with desired physical properties. From the point of view of electronics, it is desirable to covalently satisfy all surface bonds, thereby shifting the surface states out of the band gap and into the valence and conduction bands.
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Sani, Amiril Sahab Abdul, Azlee Zabidi et Mohd Yazid Abu. « Electrode wear performance during electrical discharge machining (EDM) using machine vision ». Dans THE PHYSICS OF SURFACES : Aspects of the Kinetics and Dynamics of Surface Reaction. AIP, 2023. http://dx.doi.org/10.1063/5.0114665.

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Ramanauskas, R., B. M. Davies et I. Jurgaitiene. « Electrocatalytic oxidation of formaldehyde on copper single crystal electrodes in alkaline solutions ». Dans The 8th Latin American congress on surface science : Surfaces , vacuum, and their applications. AIP, 1996. http://dx.doi.org/10.1063/1.51156.

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Burr, T. A., et K. D. Kolenbrander. « A Silicon Solid-State LED : Long-Lived Visible Electroluminescence from Silicon Nanocrystallites ». Dans Microphysics of Surfaces : Nanoscale Processing. Washington, D.C. : Optica Publishing Group, 1995. http://dx.doi.org/10.1364/msnp.1995.msaa2.

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We have constructed and characterized visible electroluminescent devices based on Si nanocrystallite thin films. The key to stable electroluminescent emission is the nature of the Si surface capping layer, which determines the efficiency and stability of the devices. The layers must be transparent to the emitted light, provide sufficient electrical contact to insure carrier transport to the active layer, stabilize the Si surfaces to prevent chemical and electrical degradation, and passivate the dangling surface bonds which would act as non-radiative recombination centers and quench emission. Our devices use Al and ITO (indium tin oxide) electrodes, as well as transparent polymer capping layers to provide the necessary carrier injection and chemical and electronic passivation for the silicon nanocrystallite active layer. Their electrical and optical behavior was evaluated in terms of the I-V characteristics, electroluminescence spectra, and photoluminescence spectra. These devices represent a first step towards developing efficient silicon based light-emitting technology.
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Przyklenk, A., et A. Hördt. « Influence of Electrode Heights on 4-point and 2-point Measurements Based on Capacitively Coupled Electrodes ». Dans Near Surface Geoscience 2013. Netherlands : EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20131342.

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Husinsky, W., P. Wurz, B. Strehl et G. Betz. « Electronic Excitation of Sputtered Atoms ». Dans Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C. : Optica Publishing Group, 1987. http://dx.doi.org/10.1364/msba.1987.wc2.

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The existence of sputtered electronically excited atoms and molecules is a well known fact and has been studied for quite some time. Nonetheless, up to this point a deeper understanding of excitation processes is lacking. In addition, even more puzzels have been created when first measurements by Doppler-Shift-Laser-Fluorescence-Spectroscopy (DSLFS) of the energy distribution of sputtered excited metastable atoms[1-3] showed results contradicting those theories[4,5] which had been proposed based on Light-versus-Distance (LvD)[6,7] and Line-Profile Studies[8,9] of the emitted light of sputtered short-lived excited atoms.
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Rapports d'organisations sur le sujet "Electrodic surfaces"

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Friedrich, K. A., et G. L. Richmond. Surface Second Harmonic Generation Studies of Stepped Ag(111) Electrode Surfaces. Fort Belvoir, VA : Defense Technical Information Center, mai 1993. http://dx.doi.org/10.21236/ada265205.

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Kevan, S. D. Surface and interface electronic structure. Office of Scientific and Technical Information (OSTI), janvier 1990. http://dx.doi.org/10.2172/6171208.

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Guo, J. First-principles calculations of surface energy and electronic structure of LiF, NaCl and MgO (100) surfaces. Office of Scientific and Technical Information (OSTI), juin 1993. http://dx.doi.org/10.2172/46692.

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M.K. Mazumder, D.A. Lindquist, K.B. Tennal, Steve Trigwell, Steve Farmer, Albert Nutsukpul et Alex Biris. Electronic Surface Structures of Coal and Mineral Particles. Office of Scientific and Technical Information (OSTI), avril 2001. http://dx.doi.org/10.2172/884842.

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M.K.Mazumder, D.A. Linduist et K.B. Tennal. ELECTRONIC SURFACE STRUCTURES OF COAL AND MINERAL PARTICLES. Office of Scientific and Technical Information (OSTI), avril 2001. http://dx.doi.org/10.2172/834520.

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Weinelt, M., A. Nilsson et N. Wassdahl. Electronic structure of benzene adsorbed on Ni and Cu surfaces. Office of Scientific and Technical Information (OSTI), avril 1997. http://dx.doi.org/10.2172/603568.

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Kevan, S. D. Surface and interface electronic structure : Sixth year activity report. Office of Scientific and Technical Information (OSTI), janvier 1992. http://dx.doi.org/10.2172/6731142.

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Kevan, S. Surface and interface electronic structure : Fifth year progress report. Office of Scientific and Technical Information (OSTI), janvier 1991. http://dx.doi.org/10.2172/5924714.

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Kevan, S. D. Surface and interface electronic structure : Three year activity report. Office of Scientific and Technical Information (OSTI), janvier 1992. http://dx.doi.org/10.2172/7075157.

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Terry, Jr, J. H. Atomic and electronic structures of novel silicon surface structures. Office of Scientific and Technical Information (OSTI), mars 1997. http://dx.doi.org/10.2172/666057.

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