Дисертації з теми "X-ray Photoemission Spectroscopy (XPS)"
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Droschke, Sonja. "X-Ray Photoemission Spectroscopy Characterization of Fe(II)- and Fe(III)-Phthalocyanine Molecular Films." Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-257183.
Повний текст джерелаDoran, Brian. "Preparation and characterization of Ribonucleic acid (RNA)/inorganic materials interfaces using photoemission spectroscopy." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000385.
Повний текст джерелаZborowski, Charlotte. "Characterization of deeply buried interfaces by Hard X-ray Photoelectron Spectroscopy." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC025/document.
Повний текст джерелаThis thesis aims at improving the inelastic background analysis method in order to apply it to technologically relevant samples. Actually, these improvements are utterly needed as they concern criteria of accuracy and time saving particularly for analysis of devices presenting deeply buried layers with different materials. For this purpose, the interest of the inelastic background analysis method is at its best when combined with hard X-ray photoelectron spectroscopy (HAXPES) because HAXPES allows to probe deeper in the sample than with conventional X-ray photoelectron spectroscopy (XPS). The present work deals with technologically relevant samples, mainly the high-electron mobility transistor (HEMT), at some crucial steps of their fabrication process as annealing. Actually, it is very important that these analyses shall be performed non-destructively in order to preserve the buried interfaces. These are often the location of complex phenomena that are critical for device performances and a better understanding is often a prerequisite for any improvement. In this thesis, the in-depth diffusion phenomena are studied with the inelastic background analysis technique (using the QUASES software) combined with HAXPES for depth up to 60 nm. The depth distribution results are determined with deviations from TEM measurements smaller than a typical value of 5%. The choice of the input parameters of the method is discussed over a large range of samples and simple rules are derived which make the actual analysis easier and faster to perform. Finally, it was shown that spectromicroscopy obtained with the HAXPEEM technique can provide spectra at each pixel usable for inelastic background analysis. This is a proof of principle that it can provide a 3D mapping of the elemental depth distribution with a nondestructive method
Denne afhandling har til formål at forbedre den uelastiske baggrundsanalysemetode til anvendelser i den til teknologiske industri. Faktisk er disse forbedringer absolut nødvendige, for at opnå nøjagtighed og tidsbesparelse, især for analyse af prøver med dybt begravede lag af forskellige materialer. Til det formål er interessen for den uelastiske baggrundsanalysemetode bedst i kombination med hård røntgenfotoelektron-spektroskopi (HAXPES), fordi HAXPES gør det muligt at probe dybere i prøven end med konventionel røntgenfotoelektron-spektroskopi (XPS). Dette arbejde beskæftiger sig med teknologisk relevante prøver, hovedsagelig høj-elektron mobilitetstransistor (HEMT), på nogle afgørende trin i deres fremstillingsproces som fx annealing. Faktisk er det meget vigtigt, at disse analyser udføres på en ikke-destruktiv måde for at bevare de begravede grænseflader. Det er ofte her de komplekse fysiske fænomener opstår, som er kritiske for fuktionaliteten, og en bedre forståelse af grænsefladerne er ofte en forudsætning for at kunne forbedre denne. I denne afhandling studeres de dybdegående diffusionsfænomener med den uelastiske baggrundsanalyse teknik (ved hjælp af QUASES software) kombineret med HAXPES for dybder op til 60 nm. Dybdestributionsresultaterne har afvigelser fra TEM-målinger mindre end en typisk værdi på 5%. Valget af input parametre for metoden er diskuteret på bagground af et stort udvalg af prøver samt omfattende simuleringer og enkle regler er udledt, hvilket gør den praktiske analyse nemmere og hurtigere at udføre. Endelig blev det vist, at spektromikroskopi opnået med HAXPEEM-teknikken kan tilvejebringe spektre ved hver enkelt pixel som kan anvendes til uelastisk baggrundsanalyse. Dette viser at i princippet kan en 3D-billeddannelse af den elementære dybdefordeling bestemmes ikke destruktivt
DRERA, GIOVANNI. "ELECTRONIC STRUCTURE OF TIO2 THIN FILMS AND LAALO3-SRTIO3 HETEROSTRUCTURES: THE ROLE OF TITANIUM 3D1 STATES IN MAGNETIC AND TRANSPORT PROPERTIES." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/168728.
Повний текст джерелаCaro, Anne-Sophie. "Fonctionnalisation de surfaces d'acier inoxydable afin d'inhiber les premières étapes de formation d'un biofilm." Paris 6, 2008. http://www.theses.fr/2008PA066560.
Повний текст джерелаFoster, Geoffrey M. "DEFECT AND METAL OXIDE CONTROL OF SCHOTTKY BARRIERS AND CHARGE TRANSPORT AT ZINC OXIDE INTERFACES." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524050368601169.
Повний текст джерелаVenturini, Federica. "Soft X-ray photoemission spectroscopy." Université Joseph Fourier (Grenoble), 2005. http://www.theses.fr/2005GRE10175.
Повний текст джерелаThe main motivation behind this thesis has been to determine both the advantages and the disadvantages ofthe soft X-ray application of angle-resolved photoemission spectroscopy. The investigation of a weil known system, Ag(001), enables us to discuss several questions such as the role of the photon momentum, the applicability ofthe fiee-electron-like final state approximation and the role ofphonons. The polarisation of the incoming light has also been exploited. The choice of such a system also cornes from our des ire to compare the results with calculations of angle-resolved photoemission spectra in this energy range. The anomalous low temperature properties of Ce-based compounds are generally related to the Kondo effect. Original results have been obtained by investigating the valence band of three iso-structural single crystalline Ce compounds, CeCu2Ge2, CeNi2Ge2 and CeC02Ge2. The location of the Ce M5 absorption edge within the soft X-ray energy range is exploited in order to isolate the 4f contribution to the spectra. Added to this, the use of relatively high incoming photon energies allows minimising the surface contribution. Temperature dependent, resonant, angle-resolved and angle-integrated photoemission measurements have been performed. The former are in qualitative agreement with the single impurity Anderson model, whereas the latter suggest the importance of taking the lattice into account
Kazzi, Mario Hollinger Guy. "Etude par photoemission (XPS & XPD) d'hétérostructures d'oxydes fonctionnels epitaxies sur silicium." Ecully : Ecole Centrale de Lyon, 2007. http://bibli.ec-lyon.fr/exl-doc/melkazzi.pdf.
Повний текст джерелаKazzi, Mario El. "Etude par photoemission (XPS & XPD) d'hétérostructures d'oxydes fonctionnels epitaxies sur silicium." Ecully, Ecole centrale de Lyon, 2007. http://www.theses.fr/2007ECDL0028.
Повний текст джерелаThis thesis is on one of the main INL axes, the goal of which is to develop the growth procedures of thin oxide single crystal on silicon. These oxides are meant to replace the presently used amorphous gate oxide (SiOxNy and HfSixOyNz) by a high-κ oxide in future “sub 22nm” CMOS. Besides, the interest in controlling the growth of these oxides goes far beyond this oxide gate application. This know-how would be a technological breakthrough to develop monolithic integration on silicon. In this context, the main objective of my thesis has been to study the physico-chemical and structural properties of thin oxide layers grown by Molecular Beam Epitaxy (MBE) on silicon or oxide substrate. We have used X-ray photoelectron spectroscopy (XPS) and X-ray photoelectron diffraction (XPD). First, the stress relaxation of LaAlO3 and BaTiO3 grown on SrTiO3 (001) substrate has been investigated. We have proved that below a critical thickness this two oxides can be grown pseudomorphically and that beyond a plastic relaxation occurs. In addition, we have evidenced that the ferroelectric deformation is strongly enhanced in strained BaTiO3 thin films. Second, we have studied the LaAlO3 growth on Si(001). LaAlO3 is amorphous for growth temperature below 500°C. For higher temperature, the formation of silicates at the interface prevents the crystallization. Thus, an interface engineering strategy has been set up to avoid these interfacial reactions and to succeed an epitaxial growth,. Using SrO, SrTiO3 and Al2O3 as buffer Finally, a comparison of the growth mode and interface stability has been done between Al2O3 and Gd2O3 grown either on Si(111) or Si(001) substrates. Results show that this two oxides grow along the [111] direction on Si(111). However, on Si(001), the growth mechanism is more complex leading to unusual orientations and epitaxial relationships
Doutt, Daniel R. "THE ROLE OF NATIVE POINT DEFECTS AND SURFACE CHEMICAL REACTIONS IN THE FORMATION OF SCHOTTKY BARRIERS AND HIGH N-TYPE DOPING IN ZINC OXIDE." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366199639.
Повний текст джерелаJabeen, Fauzia. "III-V semiconducting nanowires by molecular beam epitaxy." Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3097.
Повний текст джерелаThis thesis is devoted to the study of the growth of III-V nanowires (NWs) by catalyst assisted and catalyst free molecular beam epitaxy (MBE). The nanostructures have been routinely characterized by scanning electron microscopy (SEM) and, to a minor extent by transmission electron microscopy (TEM). X-ray photoemission spectroscopy (XPS), scanning photoemission microscopy (SPEM), extended X-ray absrorption fi ne structure analysis (EXAFS), photoluminescence (PL) and trans- port measurements have given an important contribution on specifi c topics. The first section of this thesis reports on GaAs, InAs, and InGaAs NWs growth by Au assisted MBE. A substrate treatment is proposed that improves uniformity in the NWS morphology. Thanks to a careful statistical analysis of the NWs shape and dimensions as a function of growth temperature and duration, evidence is found of radial growth of the NWs taking place together with the axial growth at the tip. This eff ect is interpreted in term of temperature dependent diff usion length of the cations on the NWs lateral surface. The control of the NWs radial growth allowed to grow core shell InGaAs/GaAs NWs, displaying superior optical quality. A new procedure is proposed to protect NWs surface from air exposure. This procedure allowed to perform ex-situ SPEM studies of electronic properties of the NWs. The second part of this thesis is devoted to Au-free NWs growth. GaAs and InAs NWs were successfully grown for the first time using Mn as catalyst. Incorporation of Mn in the NW is studied using EXAFS technique. It is shown that Mn atoms are incorporated in the body of GaAs NWs. Use of low growth temperature is suggested in order to improve the Mn incorporation inside GaAs NWs and obtain NWs with magnetic properties. Finally, growth of GaAs and InAs NWs on cleaved Si subtrate is demonstrated without the use of any outside metal catalyst. Two kinds of nanowires have been obtained. The experimental findings suggest that the two types of nanowires grow after di fferent growth processes.
Questa tesi e' dedicata allo studio della crescita di nanofili di semiconduttori III- V tramite epitassia da fasci molecolari (MBE) assistita da catalizzatore e senza l'uso di catalizzatori. Le nanostrutture sono state caratterizzate sistematicamente tramite microscopia elettronica a scansione (SEM), e in maniera minore microscopia elettronica in trasmissione (TEM). Altre tecniche come la spettroscopia di fotoemissione da raggi x (XPS), la microscopia da fotoemissione in scansione (SPEM), la spettroscopia di assorbimento x (in particolare la extended X-ray absorpition fine structure analysis (EXAFS)) la fotoluminescenza (PL), e il trasporto elettrico hanno dato importanti contributi su problematiche specifiche. La prima parte di questa tesi riguarda la crescita di nanofili di GaAs, InAs e InGaAs tramite MBE assistita da oro. Viene proposto un trattamento del substrato che migliora nettamente l'omogeneita' morfologica dei nanofili. Grazie ad un'attenta analisi statistica della forma e delle dimensioni dei nanofili in funzione della temperatura e del tempo di crescita e' stata dimostrata la crescita radiale dei nanofili, che avviene insieme alla crescita assiale che ha luogo alla punta del nanofilo. Le osservazioni sperimentali sono state interpretate in termini di dipendenza dalla temperatura della lunghezza di diffusione dei cationi sulle super ci laterali dei nanofili. Il controllo della crescita radiale ha permesso di crescere nanofili di InGaAs/GaAs core shell, costituiti cioe' da una anima centrale di InGaAs (core) e uno strato esterno di GaAs (shell) , che hanno dimostrato eccellente qualita' ottica. Viene quindi proposta una nuova procedura per proteggere la super ficie dei nanofili durante l'esposizione all'aria. Grazie a questa e' stato possibile realizzare ex-situ uno studio SPEM delle proprieta' elettroniche dei nanofili. La seconda parte della tesi riguarda la crescita di nanofili senza l'uso di oro. Viene per la prima volta dimostrata la possibilita' di crescere nanofili di GaAs e InAs usando il manganese come catalizzatore. L'incorporazione del Mn come impurezza nei nanofili e' stata studiata tramite EXAFS. Le misure hanno dimostrato che atomi di Mn sono effettivamente incorporate nel corpo dei nano fili. La crescita delle nanostrutture a temperatura piu' bassa potrebbe migliorare qualitativamente l'incorporazione del Mn e permettere la crescita di nanofili con proprieta' magnetiche. Viene in fine dimostrata la crescita di nanofili di GaAs e di InAs senza l'utilizzo di materiali diversi da quelli costituenti il semiconduttore. Tale risultato e' ottenuto su superfici sfaldate di silicio. Sono state osservate nanostrutture di due tipi, che sulla base dei dati sperimentali sembrano essere dovuti a due diversi meccanismi di crescita.
XXI Ciclo
1977
El, Kazzi Mario. "ETUDE PAR PHOTOEMISSION (XPS & XPD) D'HETEROSTRUCTURES D'OXYDES FONCTIONNELS EPITAXIES SUR SILICIUM." Phd thesis, Ecole Centrale de Lyon, 2007. http://tel.archives-ouvertes.fr/tel-00321458.
Повний текст джерелаDans ce contexte, l'objectif principal de ma thèse a été de mener une étude approfondie des propriétés physicochimiques et structurales de couches fines d'oxydes élaborées par Epitaxie par Jets Moléculaires (EJM) sur substrat silicium ou oxyde, en utilisant la spectroscopie de photoélectrons (XPS) et la diffraction de photoélectrons (XPD).
Nous avons étudié dans un premier temps la relaxation de films minces de LaAlO3 et de BaTiO3 épitaxiés sur des substrats de SrTiO3(001). Nous avons montré qu'au-dessous d'une certaine épaisseur critique ces deux oxydes sont contraints de façon pseudomorphiques sur SrTiO3(001). De plus nous avons clairement mis en évidence une forte augmentation de la déformation ferroélectrique pour une couche contrainte de BaTiO3.
Dans un deuxième temps, nous avons aussi étudié la croissance de LaAlO3 sur Si(001). LaAlO3 est amorphe pour des températures de croissance en dessous de 500°C. Pour des températures supérieures il y a formation de silicates à l'interface qui empêche la cristallisation. Pour surmonter cette difficulté, des procédés d'ingénierie d'interface ont été développés pour limiter les réactions interfaciales et réussir la croissance épitaxiale. Ils sont basés sur l'utilisation de couches tampons interfaciales d'oxydes comme SrO, SrTiO3 et Al2O3.
Enfin, nous avons comparé les modes de croissance et la stabilité d'interface d'Al2O3 et de Gd2O3 épitaxiés sur Si(111) et Si(001). Les résultats prouvent que la croissance de ces deux oxydes sur Si(111) a une orientation suivant [111]. Par contre sur Si(001) le mécanisme de croissance est plus complexe avec des relations d'épitaxie et des orientations inhabituelles.
Magnuson, Martin. "Electronic structure studies using resonant X-ray and photoemission spectroscopy." Doctoral thesis, Uppsala universitet, Fysiska institutionen, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-973.
Повний текст джерелаHaidu, Francisc. "Tailoring the Electronic and Optical Properties of Molecular Thin Films by Reducing and Oxidising Agents." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159012.
Повний текст джерелаUnuigbe, David Moweme. "Characterisation of silicon nanoparticles produced by mechanical attrition using scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoemission spectroscopy." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/12105.
Повний текст джерелаIncludes bibliographical references.
The establishment of printing technologies, using nanoparticle based inks, promises inexpensive manufacture of electronic devices. However, to produce working devices, nanoparticles have to meet requirements on size, shape, and composition. In the application of silicon nanoparticles in electronics, it is important that a network of interconnecting particles is formed through which charge transport can take place. Of further importance is that there is an absence of surface oxide in order to maintain a direct silicon-silicon connection within the network. In this work, cheap and scalable production of silicon nanoparticles is achieved efficiently with a top-down process of mechanical attrition by high energy milling.
Magnuson, Martin. "Electronic Structure Studies Using Resonant X-ray and Photemission Spectroscopy." Doctoral thesis, Uppsala University, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56480.
Повний текст джерелаLemon, Christine Elizabeth. "Atmospheric Corrosion of Silver Investigated by X-ray Photoelectron Spectroscopy." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1350660429.
Повний текст джерелаEhrman, James D. "X-Ray Photoelectron Spectroscopy Studies of Orthopedic Materials." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1248115447.
Повний текст джерелаLebrun, Delphine. "Thiolsulfinates/Thiolsulfonates formation: X-ray photoelectron spectroscopy (XPS) of oxidized thiols on flat surfaces." Thesis, Uppsala universitet, Materialfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160332.
Повний текст джерелаNishino, Yoichi, Takahiro Sugiura, Suguru Tanaka, Yuko Tamada, Yusuke Sandaiji, Hidetoshi Miyazaki, Manabu Inukai, et al. "Soft X-ray photoemission study of thermoelectric alloys Fe2−x−yIryV1+xAl and Fe2−xV1+x−yTiyAl." Elsevier, 2011. http://hdl.handle.net/2237/20776.
Повний текст джерелаMIYAZAKI, Hidetoshi, Kazuo SODA, Masahiko KATO, and Shinya YAGI. "Soft x-ray photoemission study of the Heusler-type Fe_2VAl_1-zGe_z alloys." Elsevier, 2007. http://hdl.handle.net/2237/9386.
Повний текст джерелаJagst, Eda [Verfasser]. "Surface functional group characterization using Chemical Derivatization X-ray Photoelectron Spectroscopy (CD-XPS) / Eda Jagst." Berlin : Freie Universität Berlin, 2010. http://d-nb.info/1024743934/34.
Повний текст джерелаLunt, Patrick Joseph Brian. "XPS studies of surface ageing and discharge processes in polymeric insulators." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/xps-studies-of-surface-ageing-and-discharge-processes-in-polymeric-insulators(2329d184-6677-4981-988e-e17b95bae229).html.
Повний текст джерелаJain, Varun. "Preparation, Functionalization, and/or Characterization by X-ray Photoelectron Spectroscopy of Carbon Surfaces for Biosensors and Other Materials." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8113.
Повний текст джерелаWu, Hao-Hsuan. "Angle-Resolved X-Ray Photoemission Spectroscopy of Self-Assembled Polymer Films on AlGaN/GaN Field Effect Transistors." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1305639462.
Повний текст джерелаKoch, Kevin David. "Temperature, photon energy and thickness dependent studies of Cs 5p core-levels on Cu(100), development of photoemission equipment and the 6m-TGM at CAMD /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3037512.
Повний текст джерелаPašiškevičius, Audrius. "Synthesis of the Vanadium Oxide Compounds and Investigation by X-Ray Photoelectron Spectroscopy Method." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2011. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20110219_122819-95620.
Повний текст джерелаŠiame darbe panaudojant zolis-gelis technologiją, susintetinti vanadžio junginių oksidinių kserogelių ir bronzos bei molekulinių oksidinių kserogelių ir bronzų plonieji sluoksniai. Visų minėtų medžiagų cheminė sudėtis ištirta Rentgeno fotoelektronų spektroskopijos metodu, siekiant nustatyti metalų jonų valentines būsenas. Panaudojant zolis-gelis technologiją, galima gana paprastais metodais, nenaudojant sudėtingos technologinės įrangos, gaminti vanadžio oksidinių bronzų plonuosius sluoksnius. Vanadžio amonio hidratuoti oksidiniai junginiai gali būti naudojami kaip medžiagos amoniako dujų jutikliams gaminti.
McGovern, William Robert. "Characterization of carbon-molecule-metal junctions by cyclic voltammetry, raman spectroscopy and X-Ray photoelectron spectroscopy." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1114560996.
Повний текст джерелаParker, Andrew Donald. "Oxidative dissolution of chalcopyrite in ferric media: an x-ray photoelectron spectroscopy study." Thesis, Curtin University, 2008. http://hdl.handle.net/20.500.11937/140.
Повний текст джерелаJohnson, Brian Ivins. "Preparation and Detailed X-Ray Photoelectron Spectroscopy and Spectroscopic EllipsometryAnalysis of Ultrathin Protective Coatings." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8119.
Повний текст джерелаParker, Andrew Donald. "Oxidative dissolution of chalcopyrite in ferric media: an x-ray photoelectron spectroscopy study." Curtin University of Technology, School of Science and Computing, 2008. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=118673.
Повний текст джерелаXPS analysis was performed on chalcopyrite massive fractured under anaerobic atmosphere and chalcopyrite massive and concentrate oxidised in 0.1 M ferric sulphate (pH 1.9) and 0.2 M ferric chloride (pH 1.6) at 50, 65 and 80ºC. Quantitative XPS analysis of the chalcopyrite surfaces required the development of programs that accounted for the observed XPS spectra. The output of these programs was used to construct profiles of the chalcopyrite surfaces and the deposited phases. These surface profiles were correlated with copper recoveries determined for chalcopyrite concentrate dissolution under the same conditions.
The surface of chalcopyrite before oxidative dissolution reconstructs to form a `pyritic' disulphide phase. This phase is oxidised in ferric media to form thiosulphate via the incorporation of oxygen atoms from the hydration sphere. The thiosulphate reacts in the oxidising conditions of low pH to form elemental sulphur, sulphite and sulphate. The sulphate complexes with ferric to produce hydronium jarosite. This reaction occurs at the surface during the initial stages of dissolution and in the bulk solution during the latter stages. This precipitation of hydronium jarosite during the latter stages of dissolution corresponds to inhibition of the dissolution reaction. It is therefore concluded hydronium jarosite is responsible for inhibiting the oxidative dissolution of chalcopyrite in ferric media.
The identification of hydronium jarosite as the inhibiting phase is consistent with the industrial practice of removing `excess' iron from the ferric solution before oxidative dissolution. However, additional iron and sulphate are generated at the chalcopyrite surface during oxidative dissolution. These high iron and sulphate concentrations combine with the low pH and high temperatures favoured for the oxidative dissolution of chalcopyrite to produce ideal conditions for jarosite precipitation. Therefore, pH must be lowered further to prevent jarosite precipitation and enhance copper recoveries from chalcopyrite in ferric media.
Saffarini, Ghassan. "X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and density study of ternary chalcogenide glasses based on Ge-Se and Ge-S." Thesis, Brunel University, 1991. http://bura.brunel.ac.uk/handle/2438/7396.
Повний текст джерелаHansson, Evelina. "Surface Analysis of Aluminium Alloy AA3003 Exposed to Immersion Corrosion Test : An X-Ray Photoelectron Spectroscopy Study." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-150170.
Повний текст джерелаI metallindustrin är korrosion ett ständigt förekommande problem som måste tas i beaktande vid design av metallprodukter. Många faktorer är avgörande när nya legeringar utvecklas och en djupare kunskap om korrosionsprocessen och dess mekanismer är av stort värde för företag världen över. Syftet med detta examensarbete var att undersöka huruvida röntgen-fotoelektron-spektroskopi, XPS, kan användas för att kvalitativt och kvantitativt karakterisera de korrosionsprodukter som bildas vid korrosion. Med målet att presentera en metod som kan användas för att vidare undersöka och öka vår förståelse för korrosionsprocessen. Aluminiumlegering AA3003 utsattes för accelererad korrosion i en surgjord saltlösning under varierande tid och korrosionsprodukter karakteriserades med XPS. Resultatet påvisade direkt korrelation mellan korrosionstid och mängd produkt. Korrosionsprodukten visade sig vara aluminiumhydroxid, Al(OH)3, och med det i åtanke kunde slutsatsen dras att XPS kan användas vid studier av korrosion. Den utvärderade metoden visar stor potential och detta examensarbete öppnar upp för vidare forskning som kan komma att öka förståelsen för korrosionsprocessen och hur den kan kontrolleras.
Lei, Yu-Guo. "Surface morphology and chemical composition of polymers studied by AFM, XPS and ToF-SIMS /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?CENG%202002%20LEI.
Повний текст джерелаGraham, Amy L. "Characterization of Heterojunctions via X-Ray and UV Photoemission Spectroscopy: Energy Level Implications for Single and Mixed Monolayer SAMs, CdSe Nanoparticle Films, and Organic Semiconductor Depositions." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195913.
Повний текст джерелаJagst, Eda [Verfasser], Manfred [Gutachter] Hennecke, and Rainer [Gutachter] Haag. "Surface Functional Group Characterization Using Chemical Derivatization X-ray Photoelectron Spectroscopy (CD-XPS) / Eda Jagst ; Gutachter: Manfred Hennecke, Rainer Haag." Berlin : Bundesanstalt für Materialforschung und -prüfung (BAM), 2011. http://d-nb.info/1122741030/34.
Повний текст джерелаRufe, Eric. "Assessing the Reactive Surface Area of Phlogopite during Acid Dissolution: An Atomic Force Microscopy, X-ray Photoelectron Spectroscopy, and Low Energy Electron Diffraction Study." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31837.
Повний текст джерелаMaster of Science
Knut, Ronny. "New Materials for Spintronics : Electronic structure and magnetism." Doctoral thesis, Uppsala universitet, Yt- och gränsskiktsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-167415.
Повний текст джерелаNordlund, Dennis. "Core Level Spectroscopy of Water and Ice." Doctoral thesis, Stockholm : Fysikum, Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-181.
Повний текст джерелаLindblad, Rebecka. "Electronic Structures and Energy Level Alignment in Mesoscopic Solar Cells : A Hard and Soft X-ray Photoelectron Spectroscopy Study." Doctoral thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-221450.
Повний текст джерелаFarha, Rana. "Nanostructures organométalliques : croissance par photochimie de couches inorganiques sous films de Langmuir." Paris 6, 2007. http://www.theses.fr/2007PA066429.
Повний текст джерелаGIAMPIETRI, ALESSIO. "GROWTH, LOCAL STRUCTURAL AND ELECTRONIC PROPERTIES, AND BAND ALIGNMENT AT SRTIO3-BASED ALL-OXIDE HETEROJUNCTIONS." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/476679.
Повний текст джерелаDhakal, Dileep, Thomas Waechtler, Schulz Stefan E, Robert Mothes, Stefan Moeckel, Heinrich Lang, and Thomas Gessner. "In-situ XPS Investigation of ALD Cu2O and Cu Thin Films after Successive Reduction." Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-147043.
Повний текст джерелаSuzuki, Noriaki. "Applications of time-of-flight secondary ion mass spectrometry (TOF-SIMS) and x-ray photoelectron spectroscopy (XPS) to study interactions of genetically engineered proteins with noble metal films /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/10618.
Повний текст джерелаWu, Meiyi. "Development of the x-ray standing waves methodology to probe the interfaces of periodic multilayers." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS175/document.
Повний текст джерелаThe interfacial information of periodic multilayers can be crucial for the development of reflecting mirrors which operate in the X-ray and extreme ultraviolet (X-EUV) ranges. Such information may contain the interdiffusion and chemical process at the interfaces of the layers. The idea of this thesis is to apply the X-ray standing wave technique to the characterization of materials, mainly but not limited to the periodic multilayers. X-ray standing wave technique enables to enhance the excitation (photoemission, fluorescence etc.) of specific locations within a periodic stack. The nature of such advantage is the interference of two coherent X-ray beams. One may compare the X-ray standing waves with the mechanical standing waves. The constructive interference at the anti-nodal plane amplifies the electric field; while the destructive interference at the nodal plane minimizes the electric field. In this way, the experimental spectra obtained under standing wave field will be mostly the material located on the anti-nodal plane. Combined with other techniques such as X-ray emission spectroscopy and X-ray photoelectron spectroscopy, a depth-selective information with a sub-nanoscale sensitivity can be obtained
Watcharinyanon, Somsakul. "Characterization of Self-Assembled Monolayers of Oligo(phenyleneethynylene) Derivatives on Gold." Licentiate thesis, Karlstad : Faculty of Technology and Science, Physics, Karlstad University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-800.
Повний текст джерелаBellanger, Marc. "Etude comparative des traitements laser excimère et plasma à décharge barrière diélectrique pour l'amélioration de l'adhésion PBT / Cuivre." Paris 6, 2006. http://www.theses.fr/2006PA066145.
Повний текст джерелаVardareli, Tugba. "Polymerization And Characterization Of Allyl Methacrylate." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607469/index.pdf.
Повний текст джерела#947
-radiation under different conditions. The polymer obtained is mostly gel type with some soluble fractions at lower conversions. Arrhenius activation energy is 82.3 kJ/mol for chemical initiated polymerization. The polymer was characterized by FT-IR, NMR, DSC, TGA, XPS, XRD, DLS, and MS methods. It was found that about 98-99% of allyl side groups retained as pendant even after completion of the polymerization, while 1-2% may give crosslinking and/or cyclization that yields lactones and anhydrides. The spectroscopic and thermal results of the work showed that the reaction is not cyclopolymerization, but may have end group cyclization. Molecular weight of 1.1x106 was measured by DLS. Therefore, insolubility is due to the high molecular weight of polymer, even in the early stage of polymerization rather than crosslinking. The Tg of PAMA was observed as 94º
C before curing, upon curing at 150-200º
C, Tg increased to 211º
C as measured by DSC. The thermal treatment of polymer at about 350º
C gave anhydride by linkage type degradation, following side group cyclization. The XPS analysis showed the presence of radical fragments of AIBN and CCl4 associated with oligomers. The MS and TGA thermograms showed two or three stage degradations depending on solubility. The first stage was mostly linkage type degradation for the fragmentation of pendant allyl groups at 225-350º
C. In the second stage, at 395-515º
C, the degradation is random scission and depolymerization.
Dell'angela, Martina. "Organic molecules at metal surfaces: the role of functional groups in self-assembly and charge transfer." Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3071.
Повний текст джерелаThe understanding of the interaction of organic molecules with metal surfaces is crucial for tailoring the desired properties of future devices that can be employed for molecular electronics or biomedical applications. Self-assembly of complex supramolecular structures and charge transfer through molecular films or even through single molecules are some of the properties that have recently attracted much interest both for possible applications and for more fundamental studies. The molecule-surface interaction takes place thanks to the functional groups that constitute the molecule. The choice of appropriate functional groups of the molecules allows their use as building blocks in the fabrication of complicate architectures [1]. In fact, the functional entities can influence molecule-molecule and molecule-surface interactions, governing the self-assembly of the molecules on the surface. In particular, in the thesis I will report on the characterization by means of Helium Atom Scattering (HAS), X-ray Photoemission Spectroscopy (XPS), Near Edge X-ray Absorption Fine Structure (NEXAFS) and Scanning Tunneling Microscopy (STM) of the self-assembly in ultra high vacuum (UHV) conditions of L-methionine molecules on different metal substrates (Ag(111), Cu(111), Au(111), Au(110)). L-methionine is an amino acid with three functional groups which can interact with the substrate or with other molecules: the amino (-NH2), the carboxyl (-COOH) and the thioether (-S-). Moreover, the first two can change their charge state in a protonated amino group (-NH+ 3 ) and a deprotonated carboxyl group (-COO−): the molecules are called zwitterionic and it is allowed the formation of hydrogen bonds between them. Hydrogen bonding between zwitterionic molecules is responsible for the crystallization in the solid state. In the thesis I have studied how, depending on the choice of the substrate and the growth conditions, L-methionine molecules form assemblies with different morphologies and different chemical states of the building blocks. L-methionine molecules deposited on Ag(111) and Au(111) are in the zwitterionic state and interact strongly via hydrogen bonding forming dimers of molecules. The weak interaction with the substrate allows the organization of these dimers in extended bidimensional nanogratings composed of chains of length extending in the micrometer range and with tunable periodicity across the chains. At temperatures below 270K, L-methionine on Cu(111) forms short aggregates of zwitterionic dimers. By increasing the substrate temperature above 300K the charge state of the amino group changes and also the interaction with the surface. Molecules are anionic (-NH2 and -COO−) and form again charged nanogratings. The anionic state of the molecules can also be obtained on the Au(110) surface, where the interaction of the amino and thioether groups with the gold inhibits the formation of zwitterionic dimers via hydrogen bonding. The functional groups in the molecules can also influence their transport properties. The final goal of miniaturization in molecular electronics research is the formation and characterization of a nanoelectronic device in which a molecule between two electrodes plays the role of an active conducting element. In such a device the interaction between the functional groups anchoring the molecule to the electrodes and the electrodes is a crucial element in order to understand and control the conduction. Recent STM-break junction experiments [2] have shown that Au-molecule-Au contacts with amino (- NH2) terminated molecules are better defined than Au-molecule-Au contacts formed with thiol (-SH) terminated molecules [3]. The strong interaction of thiols with gold surfaces is well known in literature and the self-assembly of thiolated molecules is widely employed in many applications. In contrast, the weak interaction of amino terminated molecules with gold is poorly studied. Theoretical calculations suggest that the amine lone pair is responsible for bonding and that it prefers to bind to undercoordinated gold atoms. Within this framework, in the thesis I report on the study of growth of thin films of 1,4-benzenediamine and p-toluidine on two different Au surfaces, where the atoms present different coordination: Au(111) and Au(110). Both molecules interact more strongly with the low coordination (110) surface. By means of Resonant Photoemission Spectroscopy (RPES) it has been possible to disentangle molecular orbitals and determine the ones involved in the charge transfer at the surface. In both cases the charge transfer involves states localized also on the nitrogen atoms indicating a possible interaction of the molecule with the surface through nitrogen atoms. I also studied the assembly of three benzene substituted diamines on Au(111). These results complement very well the results obtained from conduction experiments of different amine-terminated molecules and combined with theoretical investigations can help understanding the basics of the molecular charge transport mechanism. [1] Barth J.V., Costantini G., Kern K., Nature, 437 (2005) 671 [2] Venkataraman L., Klare J. E., Nuckolls C., Hybertsen M. S., Steigerwald M. L., Nature, 442 (7105), 904 (2006) [3] Schreiber F., Progress in Surface Science, 65 (5-8) (2000) 151
Lo studio dell’interazione di molecole organiche con superfici metalliche è di fondamentale importanza per la progettazione di futuri dispositivi che possiedano proprietà ben controllabili in modo tale che possano essere usati per l’elettronica molecolare o per applicazioni biomediche. L’autoassemblaggio di complesse strutture ”supramolecolari” e il trasferimento di carica attraverso film molecolari o anche attraverso singole molecole sono alcune delle proprietà che hanno attratto di recente grande interesse sia per le possibili applicazioni future che per studi di tipo più fondamentale. L’interazione molecola-superficie avviene attraverso i gruppi funzionali che costituiscono le molecole. Molecole con appropriate funzionalizzazioni possono essere usate come mattoni elementari nella fabbricazione di architetture complesse [1]. Infatti, tali gruppi funzionali possono influenzare le interazioni del tipo molecola-molecola e molecola-superficie che governano l’autoassemblaggio delle molecole sulla superficie. In particolare, in questa tesi riporter`o circa la caratterizzazione mediante diffrazione di atomi di elio (HAS), spettroscopia di fotoemissione di raggi X (XPS), misure di assorbimento di raggi X (NEXAFS) e microscopia ad effetto tunnel (STM) dell’autoassemblaggio in condizioni di ultra alto vuoto (UHV) di molecole di L-metionina su diversi substrati metallici (Ag(111), Cu(111), Au(111), Au(110)). La molecola di L-metionina `e un amminoacido che presenta tre gruppi funzionali i quali possono interagire con il substrato o con altre molecole: il gruppo amminico (-NH2), il gruppo carbossilico (- COOH) e il gruppo tioetere (-S-). I primi due possono inoltre cambiare il loro stato di carica originando un gruppo amminico protonato (-NH+ 3 ) e un gruppo carbossilico deprotonato (COO−): in tal caso le molecole sono dette zwitterioniche ed è permessa la formazione di legami a idrogeno tra esse. I legami a idrogeno tra molecole zwitterioniche sono responsabili della loro cristallizzazione nello stato solido. In questa tesi ho studiato come, a seconda della scelta del substrato e delle condizioni di cescita, le molecole di L-metionina formino strutture assemblate che presentano diverse morfologie e diversi stati chimici delle molecole costituenti. Le molecole di L-metionina depositate su Ag(111) e Au(111) sono zwitterioniche e interagiscono fortemente tra di loro tramite legami a idrogeno a formare dimeri di molecole sulla superficie. La debole interazione con il substrato permette l’organizzazione di questi dimeri in estesi reticoli bidimensionali di dimensione nanometrica composti da catene di lunghezza nel range micrometrico e con spaziatura tra le catene controllabile. A temperature sotto 270K, le molecole di L-metionina su Cu(111) formano corti aggregati di dimeri zwitterionici. Aumentando la temperatura del substrato oltre 300K lo stato di carica del gruppo amminico cambia e quindi l’interazione con la superficie. Le molecole sono anioniche (-NH2 e COO−) e formano di nuovo reticoli carichi. Lo stato anionico delle molecole si può ottenere anche sulla superficie di Au(110) dove l’interazione dei gruppi amminico e tioetere con l’oro inibisce la formazione di dimeri zwitterionici via legami a idrogeno. I gruppi funzionali nelle molecole possono anche influenzare le loro proprietà di trasporto. Lo scopo finale della miniaturizzazione nella ricerca nel campo dell’elettronica molecolare è la formazione e caratterizzazione di un dispositivo nanoelettronico in cui una molecola immobilizzata tra due elettrodi gioca il ruolo di elemento conduttivo attivo. In tale dispositivo il controllo dell’interazione tra i gruppi funzionali che tengono la molecola attaccata gli elettrodi e gli elettrodi è un elemento cruciale per la comprensione e il controllo della conduzione. Recenti esperimenti del tipo STM break junction [2] hanno motrato che contatti del tipo Au-molecola-Au con molecole con terminazioni amminiche (NH2) sono meglio definiti che contatti del medesimo tipo con molecole con terminazione tiolica (-SH) [3]. La forte interazione dei tioli con superfici d’oro è ben nota in letteratura e l’autoassemblaggio di molecole con terminazione tiolica è largamente utilizzato in molte applicazioni. In contrasto, la debole interazione di molecole con terminazione amminica con superfici d’oro è stata poco studiata. Recenti calcoli teorici hanno previsto che le molecole si legano alla superficie d’oro attraverso il ”lone pair” localizzato sull’azoto e che sono preferiti i legami con atomi di oro di bassa coordinazione. In particolare, nella tesi riporterò i risultati dello studio della crescita di film sottili di 1,4-benzenediamina e p-toluidina su due diverse superfici d’oro, i cui atomi di superficie presentano diversa coordinazione: Au(111) e Au(110). Ambedue le molecole interagiscono più fortemente con la superficie di bassa coordinazione (110). Tramite la tecnica di fotoemissione risonante (RPES) è stato possibile individuare gli orbitali molecolari e determinare quelli coinvolti nel trasferimento di carica all’interfaccia. In ambedue i casi il trasferimento di carica coinvolge stati che sono localizzati anche sull’atomo di azoto, il che indica una possibile interazione della molecola con la superficie attraverso i gruppi amminici. Ho anche studiato l’assemblaggio su Au(111) di tre diverse benzene-diamine con vii diversi sostituenti legati all’anello. Questi risultati sono un complemento ai risultati ottenuti da esperimenti di conduzione di molecole con diverse terminazioni amminiche e combinati con le investigazioni teoriche possono aiutare nella comprensione dei fondamenti dei meccanismi di trasporto di carica nelle molecole. [1] Barth J.V., Costantini G., Kern K., Nature, 437 (2005) 671 [2] Venkataraman L., Klare J. E., Nuckolls C., Hybertsen M. S., Steigerwald M. L., Nature, 442 (7105), 904 (2006) [3] Schreiber F., Progress in Surface Science, 65 (5-8) (2000) 151
XXI Ciclo
1981
Maurau, Rémy. "Etude de l'influence du régime d'une décharge à barrière diélectrique dans un mélange HMDSO/N², sur les propriétés d'un procédé de dépôt." Paris 6, 2009. https://pastel.archives-ouvertes.fr/pastel-00006139.
Повний текст джерела