Gotowe bibliografie tematyczne / Graphene Oxide Thin Film

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Gotowa bibliografia na temat „Graphene Oxide Thin Film”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Graphene Oxide Thin Film"

Do Thi Thuy. "SYNTHESIS THIN FILM ELECTRODES GRAPHENE VIA NOVEL 3D PRINTALBE TECHNIQUE AND DETERMINE PROPERTY ELECTROCHEMICAL". Journal of Military Science and Technology, nr 75A (11.11.2021): 29–37. http://dx.doi.org/10.54939/1859-1043.j.mst.75a.2021.29-37.

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Graphene film electrodes have many important applications, but the fabriacion of these electrodes is difficult dues to the poor processing of graphene. This article describes the preliminary results of using 3D printing technology to fabricate thin-film electrodes from graphene oxide inks. Graphene oxide ink is synthesized by chemical method. The graphene oxide (GO) and reduction graphene oxide (r GO) thin film were chacracterized by filed scanning electron microscopy (FESEM) and Energy-dispersive X-ray spectrocopy (EDX spectrocopy) to make sure the morphological and optical characteristics of the thin film. In addition, the electrochemical aera active studies were also determined by cyclic voltametry (CV) curves. The r GO thin film displays higher electrochemical area active in comparison with GO, which is 2.56 cm2 compare to 0.31 cm2, indicating the best result for the superior conductivity of thin film electrode.

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Ahn, Ho Sang, Hye Jin Park, Ju Hyun Oh, Jin Chul Joo i Dong Joo Kim. "VOCs Sensing Property of Graphene Oxide Thin Film by Reduction Rate". Applied Mechanics and Materials 440 (październik 2013): 64–68. http://dx.doi.org/10.4028/www.scientific.net/amm.440.64.

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We demonstrate a combinatorial graphene oxide (GO) and reduced graphene oxide (rGO) thin film sensor fabricated by spin coating and dip casting method. Thermal treatment was followed to convert graphene oxide into reduced graphene oxide at different temperatures. 100ppm of evaporated methanol was utilized to examine the resistance profile of graphene oxide thin film and reduced graphene oxide thin film. Crystalline phase of GO and rGO were characterized by XRD. Surface roughness was observed by FE-SEM. Obvious opposite sensing property of GO and rGO were observed according to drying conditions.It was attributed to the change in number of radicals and type attached to the edge and surface of graphene oxide during reduction. Authors suggest that control of reduction rate by thermal treatment would be the one of the readiest approaches to enhance the selectivity of gas sensing in terms of direction of reaction.

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Kim, Daeok, i Ali Coskun. "Graphene oxide-templated preferential growth of continuous MOF thin films". CrystEngComm 18, nr 22 (2016): 4013–17. http://dx.doi.org/10.1039/c5ce02188j.

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Alazzam, Alamoodi, Abutayeh, Stiharu i Nerguizian. "Fabrication of Porous Gold Film Using Graphene Oxide as a Sacrificial Layer". Materials 12, nr 14 (18.07.2019): 2305. http://dx.doi.org/10.3390/ma12142305.

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An original and simple fabrication process to produce thin porous metal films on selected substrates is reported. The fabrication process includes the deposition of a thin layer of gold on a substrate, spin coating of a graphene oxide dispersion, etching the gold film through the graphene oxide layer, and removing the graphene oxide layer. The porosity of the thin gold film is controlled by varying the etching time, the thickness of the gold film, and the concentration of the graphene oxide dispersion. Images by scanning electron and metallurgical microscopes show a continuous gold film with random porosity formed on the substrate with a porosity size ranging between hundreds of nanometers to tens of micrometers. This general approach enables the fabrication of porous metal films using conventional microfabrication techniques. The proposed process is implemented to fabricate electrodes with patterned porosity that are used in a microfluidic system to manipulate living cells under dielectrophoresis. Porous electrodes are found to enhance the magnitude and spatial distribution of the dielectrophoretic force.

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Abdul Hussein, Adi Mahmood, Sallal Abdulhadi Abdullah, Mohammed RASHEED i Rafid Sabbar Zamel. "Optical and Electrical Properties of Glass/Graphene Oxide Thin Films". Iraqi Journal of Physics (IJP) 18, nr 47 (30.11.2020): 73–83. http://dx.doi.org/10.30723/ijp.v18i47.617.

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The study effect Graphene on optical and electrical properties of glass prepared on glass substrates using sol–gel dip-coating technique. The deposited film of about (60-100±5%) nm thick. Optical and electrical properties of the films were studied under different preparation conditions, such as graphene concentration of 2, 4, 6 and 8 wt%. The results show that the optical band gap for glass-graphene films decreasing after adding the graphene. Calculated optical constants, such as transmittance, extinction coefficient are changing after adding graphene. The structural morphology and composition of elements for the samples have been demonstrated using SEM and EDX. The electrical properties of films include DC electrical conductivity; we found an increasing in current as graphene concentration increases.

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Jaafar, E., Muhammad Kashif, S. K. Sahari i Z. Ngaini. "Study on Morphological, Optical and Electrical Properties of Graphene Oxide (GO) and Reduced Graphene Oxide (rGO)". Materials Science Forum 917 (marzec 2018): 112–16. http://dx.doi.org/10.4028/www.scientific.net/msf.917.112.

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In this work, graphene oxide (GO) is synthesized via chemical method (improved method) and reduced grapheneoxide(rGO) using thermal treatment. The GO and rGO thin films were coated on a glass substrate by using drop casting method. The GO and rGO thin film were characterized by scanningelectronmicroscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) to make sure the morphological and optical characteristics of the thin film. In addition, the electrical studies were performed by current-voltage (I-V) characteristic. The rGO thin film displays higher conductivity in comparison with GO which is 4.12 x 10-5S/cm, and also affected the morphological (SEM) and optical properties (FTIR). Morphological and optical data confirms that rGO losses the oxygen groups compare to GO.

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ZHU, JIAYI, i JUNHUI HE. "SELF-ASSEMBLY FABRICATION OF GRAPHENE-BASED MATERIALS WITH OPTICAL–ELECTRONIC, TRANSIENT OPTICAL AND ELECTROCHEMICAL PROPERTIES". International Journal of Nanoscience 11, nr 06 (grudzień 2012): 1240032. http://dx.doi.org/10.1142/s0219581x12400327.

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Directed self-assembly of nano or microsized materials as building blocks is a very exciting research topic to construct large-scale but still uniform 2D or 3D architectures. Graphene shows great potential as an advanced building block for fabricating varied graphene-based functional films or architectures together with other metal, metal oxide and semiconductor nanomaterials. In our work, we demonstrated an approach to fabrication of flexible, transparent conductive thin films via layer-by-layer (LbL) assembly of oppositely charged reduced graphene oxides (RGOs). The graphene thin films showed remarkable optical–electronic properties. Inspired by this, we further fabricated transparent conductive hybrid thin film via LbL assembly of oppositely charged RGO nanosheets and Pt nanoparticles. The graphene– Pt hybrid thin film showed transient optical property as well as appropriate conductive and wetting properties. Moreover, we demonstrated graphene wrapped- MnO2 (GW- MnO2 ) nanocomposites by self-assembly of honeycomb MnO2 nanospheres and graphene sheets via an electrostatic co-precipitation method. The hybrid materials had a good electrochemical performance.

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Bolhan, Aisyah, Norasikin Ahmad Ludin, Najah Syahirah Mohd Nor, Mohd Adib Ibrahim, Suhaila Sepeai, Mohd Asri Mat Teridi, Kamaruzzaman Sopian i Azami Zaharim. "Catalytic Performance of Pt/rGO using Stacked Layer Technique for DSSC Counter Electrode". Jurnal Kejuruteraan 31, nr 1 (30.04.2019): 115–22. http://dx.doi.org/10.17576/jkukm-2019-31(1)-14.

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The stacked layer technique of platinum (Pt) and reduce graphene oxide (rGO) counters electrode thin film fabricated by using doctor blade method was prepared. The first layer with direct intact on fluorine doped tin oxide (FTO) glass substrate was graphene thin film and second layer on top of graphene layer was Pt thin film. X-ray diffraction (XRD) and atomic force microscopy (AFM) were performed on the thin films to determine the formation of crystallite structure and the surface roughness of the thin films, respectively. The crystallite size was determined from XRD data and it shows that Pt/rGO-10 thin film has the suitable crystal size for a better catalytic activity. As for surface roughness analysis from AFM images, Pt and Pt/rGO thin films exhibit the rougher surface compared to rGO thin film. The thin films were further analysed using field emission scanning electron microscopy (FESEM) to observe the adhesion of Pt and rGO on FTO glass substrate in nanoscale image. The catalytic activity of each thin film was measured by cyclic voltammetry (CV). The Pt/rGO counter electrode of 10μl aqueous graphene oxide denoted as Pt/rGO-10 has high catalytic activity compare to Pt. The Pt/rGO-10 recorded the highest current density at -3.075 mA/cm-2 indicate a high catalytic activity at the counter electrode. Thus, Pt/rGO-10 counter electrode thin film deemed as comparable to conventional counter electrode material which is Pt. Therefore, Pt/rGO-10 counter electrode is expected to improve the performance of Dye-sensitized solar cell.

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Karlsson, Anton, Helena Grennberg i Stefan Johansson. "Graphene oxide microstructure control of electrosprayed thin films". RSC Advances 13, nr 2 (2023): 781–89. http://dx.doi.org/10.1039/d2ra06278j.

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Safa, Saeed, Rasoul Sarraf-Mamoori i Rouhollah Azimirad. "The Effects of Reduced Graphene Oxide (rGO) on ZnO Film UV-Detector". Advanced Materials Research 829 (listopad 2013): 577–82. http://dx.doi.org/10.4028/www.scientific.net/amr.829.577.

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In this work, pure and graphene incorporated ZnO thin films were prepared by solgel method on glass substrates and influence of graphene doping on the structural, electrical and optical properties of the films were studied. The results of Raman spectrum indicated the coexistence of ZnO and rGO in composite thin film. The FT-IR analysis of the composite sample showed that ZnO, ZnO-C heterojunction and C-C graphene skeletal peak are formed. The UV-Vis spectrum showed that both the transparency and band gap was partially decreased by graphene incorporation. The linear trend of I-V curve suggests an ohmic contact between ZnO and graphene nanosheets. In addition, the resistivity was decreased from 4.32×102 Ω.cm for pure ZnO film to 2.4×101 Ω.cm for composite film. The composite photodetector possessed a desirable signal to noise ratio and UV-sensitivity while the response time decreased to half of pure ZnO. The above results suggest that 0.225 wt.% rGO incorporation can improve the ultraviolet detection of ZnO thin film.

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Rozprawy doktorskie na temat "Graphene Oxide Thin Film"

Tekenya, Ronald. "Graphene-modified pencil graphite mercury-film electrodes for the determination of trace metals by cathodic adsorptive stripping voltammetry". University of the Western Cape, 2018. http://hdl.handle.net/11394/6552.

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>Magister Scientiae - MSc
This project focuses on the simple, fast and highly sensitive adsorptive stripping voltammetry detection of Nickel and Cobalt complexed with DMG and Nioxime respectively at a Reduced Graphene Oxide modified pencil graphite electrode in water samples. This research as well demonstrates a novel electrochemically reduced graphene oxide (ERGO)/mercury film (MF) nanocomposite modified PGE, prepared through successive electrochemical reduction of graphene oxide (GO) sheets and in-situ plated mercury film. The GO and graphene were characterized using FT-IR, HR-SEM, HR-TEM, XRD and Raman spectroscopy. The FT-IR results supported by Xray diffraction analysis confirmed the inclusion of oxygen moieties within the graphitic structure during the chemical oxidation step. Microscopic and spectroscopic analysis was used to confirm the stackings of graphene on the pencil electrode. The ERGO-PG-MFE, in combination with a complexing agents of [dimethylglyoxime (DMG) and Nioxime] and square-wave cathodic stripping voltammetry (SW-CSV), was evaluated towards the individual determination of Ni2+ and Co2+ respectively and simultaneous determination of both metals from the combination of DMG and Nioxime mixture. A single-step electrode pre-concentration approach was employed for the in-situ Hg-film electroplating, metal-chelate complex formation and its non-electrolytic adsorption at – 0.7 V for the individual analysis of Ni2+ and Co2+. The current response due to metal-ligand(s) complex reduction were studied as a function of experimental variables; deposition/accumulation potential, deposition/accumulation time, rotation speed, frequency and amplitude and carefully optimized for the individual determination of Ni2+and Co2+ and simultaneous determination of Ni2+ and Co2+ at low concentration levels (μg L-1) in 0.1 M NH3- NH4Cl buffer solution (pH 9.4) solution. The recorded limit of detection for the individual analysis of Ni2+and Co2+ was found to be 0.120 μg L-1 and 0.220 μg L-1 respectively, at an accumulation time of 120 s for both metals. The recorded limit of detection of the simultaneous analysis of Ni2+ and Co2+ was found to be 6.1 μg L-1 and 1.8 μg L-1 respectively. The ERGO-PG-MFE further demonstrated a highly selective stripping response toward all trace metal analysis. The testing of the applicability of graphene-based sensor and method in laboratory tap water samples was evaluated. This electrode was found to be sensitive enough to detect metal ions in the tap water samples at the 0.2 μg L-1 level for individual analysis and 0.001 μg L-1 for simultaneous, well below WHO standards.

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Sanga, Nelia Abraham. "Determination of heavy metals at the electrochemically reduced graphene oxide mercury film electrode (ERGO-HgF-PGE) using adsorptive stripping voltammetry". University of Western Cape, 2020. http://hdl.handle.net/11394/7718.

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>Magister Scientiae - MSc
This work reports the use of a pencil graphite electrode (PGE) as inexpensive and sensitive electrochemical sensing platform fabricated by using electrochemically reduced graphene oxide (ERGO) in conjunction with an in-situ plated thin mercury film. For the first time the ERGOHgF-PGE sensor is proposed for simultaneous detection of cadmium (Cd2+), copper (Cu2+), lead (Pb2+) and zinc (Zn2+) using N-Nitroso-N-phenylhydroxylamine (cupferron) as complexing agent by square-wave adsorptive cathodic stripping voltammetry (SW-AdCSV). The technique is based on the adsorption of cupferron- metal ion complexes onto the surface of the ERGO-HgFPGE at 0.1 V for 60 s carried out in 0.1 M acetate buffer solution (pH 4.6). The synthesized graphene oxide (GO) and graphene nanosheets (GNs) were characterized using different analytical techniques such as FT-IR which confirms the presence of oxygen moieties embedded in the graphitic structure and further demonstrated by UV-Vis, validating the synthesis of GO
2023

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Le, Louie. "Nanocomposites and graphene oxide thin film coatings on the surface of fiber reinforced composites for enhanced flame retardancy". Thesis, Wichita State University, 2013. http://hdl.handle.net/10057/6425.

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Pant, Bharat Raj. "A Comparative Study on P-type Nickel Oxide and N-type Zinc Oxide for Gas Sensor Applications". University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1525473245395728.

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Dorenkamp, Yvonne Jeannette. "Inelastic H-Atom scattering from ultra-thin films". Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E49B-7.

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Ferrah, Djawhar. "Etude des propriétés physico-chimiques d'interfaces par photoémission". Thesis, Ecully, Ecole centrale de Lyon, 2013. http://www.theses.fr/2013ECDL0048/document.

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L'objectif de cette thèse est d'étudier les propriétés physico-chimiques des surfaces et des interfaces des couches minces par spectroscopie de photoémission (XPS), diffraction des photoélectrons (XPD), et la photoémission résolue en temps (PTR). Les expériences sont réalisées en utilisant une source standard des rayons X AlKa à l'INL ou les rayons X mous auprès du synchrotron Soleil. La première étude sur le système Pt/ Gd203/ Si(111) a montré que le transfert de charge entre le Pt et 0 à l'interface Pt/Gd203 implique un déplacement chimique de niveau Pt4f sans modification des caractéristiques de la composante métallique des spectres XPS. L'étude XPD montre que Pt se cristallise partiellement en deux domaines : [110] Pt(111) // [110] Gd203 (111) et [101] Pt(111) / / [110] Gd203 (111). De plus, une autre phase ordonnée d'oxyde de platine Pt02 à l'interface a été observée. A travers la caractérisation de la morphologie déterminée par la technique AFM et XPD, nous avons discuté l'adhésion aux interfaces métal/oxyde. La deuxième étude traite l'évolution d'interface d'un système modèle : métal non réactive/ semi-conducteur, dépendent fortement des conditions thermodynamiques. Nous avons étudié la couche mince d'Au déposée sur le substrat Si(001) par photoémission résolue en temps (TEMPO- synchrotron Soleil). L'étude XPS, montre avant le recuit la formation de l'oxyde native Si02 sur l'heterostructure à température ambiante. La désorption de cet oxyde se produit à faible température et induit une décroissance de l'intensité des photoélectrons durant le temps de recuit. La désorption de l'oxyde Si02 et la formation de l'alliage AuSi sont responsables de la gravure et la formation des puits de forme cubique à la surface de Si due à l'activité catalytique de l'Au. La troisième étude concerne la croissance du graphène à partir de cristal de SiC(0001)- face Si par décomposition thermique. Le niveau de coeur C1s résolu en trois composantes principales sont associées au carbone de 6H-SiC, de graphène, et l'interface graphène/ 6H-SiC (0001). L'intensité de chaque composante est rapportée en fonction de l'angle polaire (azimutale) pour différents angles azimutales (polaire). Les mesures XPD fournissent des informations cristallographiques qui indiquent clairement que les feuillets de graphène sont organisés en structure graphite sur le substrat 6H-SiC (0001). Cette organisation résulte de l’effondrement de la maille de substrat. Enfin, le découplage à l'interface graphène/ 6H-SiC (0001) par l'oxygène a été étudié par XPS. La dernière étude concerne la croissance du film mince d'InP par MBE sur le substrat SrTi03 (001). L'intégration des semi-conducteurs III-V sur le Si, en utilisant la couche tampon d'oxyde SrTi03 est l'objet des intenses recherches, en raison des applications prometteuses dans le domaine de nano-optoélectronique. Les niveaux de coeur O1s, Sr3d, Ti2p, In3d, P2p ont été analysés et rapportés en fonction de l'angle azimutale à différents angles polaires. La comparaison des courbes XPD azimutales de Sr3d et In3d montre que les ilots InP sont orientées (001) avec la relation d'épitaxie; [110]InP(001 )/ / [100]! SrTi03 (001). La caractérisation morphologique par AFM montre des ilots InP facettés régulièrement dispersée à la surface
The main objective of this thesis is to study the chemical and physical properties at the surface or at the interface between thin layers by photoemission spectroscopy (XPS), photoelectron diffraction (XPD), and time resolved photoemission (PTR) . The experiments were conducted using an Alka source at INL or soft -X ray synchrotron radiation at Soleil, the French national Synchrotron facility. The first photoemission study has been performed on platinum deposited on thin Gd2(h layers grown by Molecular Bearn Epitaxy (MBE) on Si (111) substrate. The charge transfer between Pt and 0 at the interface causes a chemical shift to higher binding energies without changing the characteristic shape of the metal XPS peak. The XPD study shows that Pt is partially crystallized into two (111)-oriented do mains on Gd20 3 (111) with the in-plane epitaxial relationships [11 0] Pt (111) / / [11 0] Gd203 (111) and [101] Pt(111)/ / [11 0] Gd20 3 (111). In addition to bi-domains formation of platinum Pt (111) on Gd20 3 (111), a new ordered phase of platinum oxide Pt02 at the Pt/ Gd203 interface have been observed. The study of the background of the polar curves depending of the morphology has shown, that the film of Pt does not wet on the oxide, due to the low energy of interaction at the interface compared to the Pt thin layer. The second study has been interested to the photoemission time-resolved study of non-reactive metal / semiconductor model system. We have studied the thin layer gold (Au) growth on silicon (Si) substrate before and during annealing in TEMPO beam line (synchrotron Soleil).The XPS study, shows before annealing the formation of silicon native oxide on heterostructure at ambient temperature. The desorption of silicon oxide during annealing at low temperature induce photoemission intensity decreases with time. The desorption of oxide and alloy formation (AuSi) induce distribution of pits with cubic form at silicon surface due to gold etching activity. The third photoemission study has concerned thin films of a few layers of graphene obtained by solid-state graphitization from 6H-SiC (0001) substrates have been studied by X-ray photoelectron spectroscopy (XPS) and X-ray photoelectron diffraction (XPD). The Cls core-level has been resolved into components, which have been associated with carbon from bulk SiC, carbon from graphene and carbon at the interface graphene/ 6H-SiC (0001). Then, the intensity of each of these components has been recorded as a function of polar (azimuth) angle for several azimuth (polar) angles. These XPD measurements provide crystallographic information which clearly indicates that the graphene sheets are organized in graphite-like structure on 6H-SiC(0001), an organization that results of the shrinking of the 6H-SiC (0001) lattice after Si depletion. Finally the decoupling of graphene from 6H-SiC (0001) substrate by oxygen intercalation has been studied from the XPS point of view. Finally, photoemission study has concerned thin film of InP (phosphor indium ) islands grown by Molecular Bearn Epitaxy (MBE) on SrTi03 (001) bulk substrate have been investigated by X-ray photoelectron spectroscopy and diffraction (XPS/ XPD).Integration of III-V semi-conductor on silicon wafer, via SrTi03 buffer is currently the subject of intense research because of its potentially interesting applications in future nano-optoelectronics. The Ols, Sr3d, Ti2p, In3d, and P 2p core level area have been studied as function of azimuth angle for different polar angles. Comparison of the XPD azimuth curves of Sr3d and In3d shows that islands InP are oriented (001) with an in-plane epitaxial relationship [110] InP(001 ) // [100] SrTi03 (001). AFM images shows that InP islands are regularly dispersed on the surface. Their shape is a regularly facetted half-sphere

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Ly, Kally Chein Sheng 1992. "Fabricação e caracterização de filme fino regenerável hidrofóbico". [s.n.], 2017. http://repositorio.unicamp.br/jspui/handle/REPOSIP/330349.

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Orientador: Antonio Riul Júnior
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
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Resumo: Materiais biomiméticos são inspirados em estruturas biológicas para a obtenção de propriedades e funcionalidades específicas. Dentre os materiais biomiméticos, os que são capazes de se regenerar (self-healing) despertaram grande interesse pelo potencial de aplicação em diversas áreas. Para ilustrar, alguns materiais autorregeneráveis poliméricos apresentam regeneração múltipla, necessitando apenas de água para que a regeneração ocorra em alguns minutos, aumentando consideravelmente a proteção mecânica da superfície contra desgastes, danos mecânicos entre outros. Entretanto, múltiplas imersões em água ou em meios aquosos pode degradar o material e neste contexto este projeto visa incorporar a hidrofobicidade a um sistema regenerável. Desta forma, o material regenerável hidrofóbico, durante sua regeneração imersa em água, poderá diminuir a interação da superfície não danificada com a água, reduzindo corrosões e degradações devido a meios aquosos. Estudamos a nanoestruturação de materiais através da técnica de automontagem por adsorção física (LbL, do inglês Layer-by-Layer) utilizando os polieletrólitos poli(etileno imina) (PEI) e poli(ácido acrílico) (PAA), a fim de produzir revestimentos capazes de se regenerar a danos mecânicos micrométricos. Adicionalmente, foram incorporados a estes dois materiais nanofolhas de óxido de grafeno reduzido (rGO) funcionalizados com poli(cloridrato de alilamina) (GPAH) e poli(estireno-sulfonato de sódio) (GPSS), com o intuito de verificarmos um aumento de resistência a abrasão do material e alterações nas propriedades elétricas na nanoestrutura formada para aumentar o potencial de aplicação em eletrônica flexível. A arquitetura molecular (GPAH-PEI/GPSS-PAA)60 foi caracterizada com espectroscopia Raman, medidas de ângulo de contato, microscopia de força atômica, medidas elétricas e nanoindentação. Foi observada boa regeneração do material após 15 minutos de imersão em água a temperatura ambiente em um dano mecânico da ordem de 10 micrômetros. Também observamos boa hidrofobicidade do filme LbL (GPAH-PEI/GPSS-PAA)60 ( teta = 136º), e medidas de microscopia de força atômica e perfilometria indicaram, respectivamente, rugosidade superficial de 55 nm em uma área de (2 ?m x 2 ?m) e espessura de filme de 30 ?m. A análise Raman apontou para uma forte interação das nanofolhas de rGO com os polímeros, corroborando o tem caráter elétrico isolante do filme (GPAH-PEI/GPSS-PAA)60, que apresentou função trabalho ~ 5,2 eV e condutividade elétrica da ordem de 10-7 S/cm, que acreditamos resultar das fortes interações das nanofolhas com os polímeros. Por fim, medidas de nanoindentação indicaram que a incorporação de nanofolhas de GPSS e GPAH aumentou em 10 vezes a dureza do nanocompósito formado, sem comprometer a regeneração
Abstract: Biomimetic materials are inspired in biological structures to obtain specific properties and functionalities and among them, those capable of self-healing brought great interest due to high potential of application in different areas. To illustrate, some polymeric self-healing materials present multiple regeneration in the presence of water, with the regeneration occurring within a few minutes, increasing considerably the mechanical protection of a surface against wear and mechanical damage among others. Nevertheless, multiple immersions in water or in aqueous media can degrade the material and in this context this project aims the incorporation of hydrophobicity to a self-healing system. In this way, the self-healing, hydrophobic material during its immersion in water may decrease the interaction of the damaged surface with water, reducing corrosion and degradation due to aqueous media. We study the nanostructuration f materials through the layer-by-layer (LbL) technique using poly(ethylene imine) (PEI) and poly(acrylic acid) (PAA) in order to produce self-healing coatings from micrometric mechanical damages. In addition, we also incorporate to these materials reduced graphene oxide (rGO) functionalized with poly(allylamine hydrochloride) (GPAH) and poly(styrene-sodium sulfonate) (GPSS), with the purpose of verifying an increase in the mechanical abrasion resistance of the material and changes in the electrical properties of the nanostructures formed to increase the potential application in flexible electronics. The molecular architecture (GPAH-PEI/GPSS-PAA)60 was characterized by Raman spectroscopy, contact angle measurements, atomic force microscopy, electrical measurements and nanoindentation. It was observed good self-healing capacity after 15 min f immersion in water at room temperature in a mechanical scratch of the order of 10 micrometers. It was also observed good hydrophobicity in the (GPAH-PEI/GPSS-PAA)60 LbL film ( teta = 136º) and atomic force microscopy and perfilometer indicate, respectively, surface roughness of 55 nm in a (2 ?m x 2 ?m) area and film thickness of 30 ?m. Raman analysis pointed out to a strong physical interaction between the rGO nanoplatelets with the polymeric materials, corroborating the strong insulating nature of (GPAH-PEI/GPSS-PAA)60 film that displayed a work function of 5.2 eV and electrical conductivity of 10-7 S/cm, which we believe results from the strong interactions of the nanosheets with the polymers. Finally, nanoindentation measurements indicated that the incorporation of GPAH and GPSS nanoplatelets increased hardness by 10 times, without compromising the regeneration
Mestrado
Física
Mestra em Física
1543078/2015
CAPES

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Lacovig, Paolo. "Electronic structure, morphology and chemical reactivity of nanoclusters and low-dimensional systems: fast photoemission spectroscopy studies". Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3685.

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2008/2009
L'obiettivo di questa tesi è l'applicazione della spettroscopia di fotoemissione allo studio di nanoparticelle supportate e di sistemi a bassa dimensionalità. Ad una primo periodo dedicato allo sviluppo del rivelatore e del software per un nuovo analizzatore d'energia per elettroni installato presso la linea di luce SuperESCA ad Elettra, è seguita una fase durante la quale ho eseguito una serie di esperimenti mirati ad esplorare le potenzialità del nuovo apparato sperimentale. Il primo risultato ottenuto riguarda la comprensione della relazione che intercorre tra le variazioni della reattività chimica del sistema Pd/Ru(0001) e il numero degli strati di Pd cresciuti in modo pseudomorfico sul substrato di rutenio. La risoluzione temporale raggiunta con la nuova strumentazione ci ha permesso di studiare processi dinamici su una scala temporale fino ad ora inaccessibile per la spettroscopia di fotoemissione dai livelli di core: in particolare abbiamo studiato la crescita del grafene ad alta temperatura sulla superficie (111) dell'iridio e la reattività chimica di nanocluster di Pt supportati su MgO. Nel primo caso abbiamo messo in evidenza come la formazione del grafene proceda attraverso la nucleazione di nano-isole di carbonio che assumono una peculiare forma di cupola. Nel secondo caso siamo riusciti a seguire sia la dinamica del processo di adsorbimento di CO, sia la reazione CO + 1/2 O2 -> CO2 sulle nanoparticelle di Pt depositate su un film ultra-sottile di ossido di magnesio. Infine, abbiamo caratterizzato la morfologia di nanoparticelle di Pd, Pt, Rh e Au cresciute su diversi substrati a base di carbonio, in particolare grafite, nanotubi a parete singola e grafene. Tra i vari risultati abbiamo compreso come l'interazione metallo-substrato dipenda dalla dimensione delle nano-particelle e abbiamo evidenziato il ruolo centrale dei difetti del substrato nei processi di nucleazione e intercalazione.
The objective of this thesis is the application of photoelectron spectroscopy for the investigation of supported nanoclusters and low-dimensional systems. After a first stage devoted to the development of the detector and the software for the electron energy analyser installed on the SuperESCA beamline at Elettra, during the PhD project I've performed a series of experiments aimed to explore the capabilities of the new experimental apparatus. One of the first results concerns the understanding of the relation between the modifications in the chemical reactivity of the Pd/Ru(0001) system and the thickness of the pseudomorphically grown Pd overlayer. The temporal resolution achieved with the new experimental set-up allowed us to study dynamical processes on a new time scale, in particular the graphene growth process at high temperature on the Ir(111) surface and the chemical reactivity of Pt nanoclusters supported on MgO. In the former case, we discovered that graphene formation proceeds via preliminary nucleation of dome-shaped C nano-islands. In the second case, we succeded in following both the dynamics of CO adsorption process and the CO + 1/2 O2 -> CO2 reaction on Pt nanoclusters grown on a ultra-thin film of magnesium oxide. Finally, the morphology of Pd, Pt, Rh and Au nanoclusers grown on different carbon-based substrates (namely graphite, single-walled carbon nanotubes and graphene) has been characterized. Among the results we report the understanding of the dependence of the metal-substrate interaction on the cluster size and the role of defects in the nucleation and intercalation processes.
XXII Ciclo
1972

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Guan, Jingcheng. "Modelling zinc oxide thin-film growth". Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/36311.

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Photovoltaics have a significant role in the solution of energy supply and energy security. Research on photovoltaic devices and their production processes has been carried out for decades. The transparent conducting oxide layer, in the photovoltaic solar cell, composed of aluminium doped zinc oxide, is produced through deposition techniques. By modelling these depositions using classical molecular dynamics, a better understanding on the short term kinetics occurring on the growing surface has been achieved. Compared to the molecular dynamics, the employment of the adaptive kinetic Monte Carlo method enabled such surface growth dynamics simulation to reach much longer time scale. Parallelised transition searching was carried out in an on-the-fly manner without lattice approximation or predefined events table. The simulation techniques allowed deposition conditions to be easily changed, such as deposition energy, deposition rate, substrate temperature, plasma pressure, etc. Therefore, in this project three main deposition techniques were modelled including evaporation (thermal and assisted electron beam), reactive magnetron sputtering and pulsed laser depositions. ZnO as a covalent compound with many uses in semiconductors was investigated in its most energy favourable wurtzite configuration. The O-terminated surface was used as the substrate for the growth simulation. Evaporation deposition at room temperature (300 K) with a stoichiometric distribution of deposition species produced incomplete new layers. Holes were observed existing for long times in each layer. Also, stacking faults were formed during the low-energy (1 eV) growth through evaporation. The reactive sputtering depositions were more capable of getting rid of these holes structures and diminished these stacking faults through high energy bombardments but could also break these desirable crystalline structure during the growth. However, single deposition results with high energies showed that the ZnO lattice presented good capacity of self-healing after energetic impacts. Additionally, such self-healing effects were seen for substrate surface during thin film growth by the sputtering depositions. These facts shed some light on that the sputtering technique is the method of choice for ZnO thin film depositions during industrial production. Simulation results of pulsed laser deposition with separated Zn and O species showed the thin films were grown in porous structures as the O-terminated surface could be severely damaged by Zn atoms during the very short pulse window (10 microseconds). An important growth mechanism with ZnO dimer deposited on the O-terminated polar surface was the coupling of these single ZnO dimers, forming highly mobile strings along the surface and thus quenching its dipole moments, whilst the isolated single ZnO dimers were hardly of this mobility. Such strings were the building blocks for the fabrication occurring on the surface resulting in new layers. Last but not least, a reactive force field for modelling Al doped ZnO was fitted. DFT calculations showed that the Al atoms on the surface were likely to replace Zn atoms in their lattice sites for more energy favourable structures. Al on the ZnO surfaces, structures with Al in the bulk as well as configurations with Al interstitials were used to train the force field to reproduce favourable surface binding sites, cohesive energies and lattice dimensions. The combination scheme of MD and the AKMC allowed simulation work to reach over experimentally realistic time scale. Therefore, crucial mechanisms occurring during the growth could be precisely understood and investigated on an atomistic level. It has been shown from the simulation results that certain types of deposition play significant roles in the quality of resultant thin films and surface morphology, thus providing insight to the optimal deposition conditions for growing complete crystalline ZnO layers.

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Li, Sonny X. "Nitrogen doped zinc oxide thin film". Berkeley, Calif. : Oak Ridge, Tenn. : Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2003. http://www.osti.gov/servlets/purl/821916-VLVAK9/native/.

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Thesis (M.S.); Submitted to the University of California, Berkeley, 210 Hearst Mining Memorial Bldg., Berkeley, CA 94720 (US); 15 Dec 2003.
Published through the Information Bridge: DOE Scientific and Technical Information. "LBNL--54116" Li, Sonny X. USDOE Director. Office of Science. Basic Energy Sciences (US) 12/15/2003. Report is also available in paper and microfiche from NTIS.

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Chubb, Donald L. Emittance theory for thin film selective emitter. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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K, Sahoo N., i Bhabha Atomic Research Centre, red. ION assisted deposition of refractory oxide thin film coatings for improved optical and structural properties. Mumbai: Bhabha Atomic Research Centre, 1999.

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Archer, Caroline Jane. An investigation of the low energy RF plasma bombardment of thin film tin oxide surfaces. [s.l: The Author], 1999.

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France) International Conference on Thin Film Deposition of Oxide Multilayers Hybrid Structures (2nd 2001 Autrans. International Conference on Thin Film Deposition of Oxide Multilayers Hybrid Structures: TFDOM-2 : Autrans, France, October 18-19, 2001. Les Ulis, France: EDP Sciences, 2001.

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Hikita, Yasuyuki, i Harold Y. Hwang. "Complex Oxide Schottky Junctions". W Thin Film Metal-Oxides, 169–204. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0664-9_5.

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Lu, Jiwei, Kevin G. West i Stuart A. Wolf. "Novel Magnetic Oxide Thin Films". W Thin Film Metal-Oxides, 95–129. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0664-9_3.

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Demkov, Alexander A., i Agham B. Posadas. "Thin Oxide Film Characterization Methods". W Integration of Functional Oxides with Semiconductors, 89–114. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-9320-4_5.

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Li, Sonny Xiao-zhe. Nitrogen doped zinc oxide thin film. Office of Scientific and Technical Information (OSTI), styczeń 2003. http://dx.doi.org/10.2172/821916.

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Haridoss, P., E. Hellstrom, F. H. Garzon, D. R. Brown i M. Hawley. Thin film ionic conductors based on cerium oxide. Office of Scientific and Technical Information (OSTI), grudzień 1994. http://dx.doi.org/10.2172/10103830.

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Dr. Harlan U. Anderson. Microporous and Thin Film Membranes for Solid Oxide Fuel. Office of Scientific and Technical Information (OSTI), luty 2007. http://dx.doi.org/10.2172/908515.

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Shaban, Mohamed, G. F. Attia, Mohamed A. Basyooni i Hany Hamdy. Synthesis and characterization of Tin oxide thin film, effect of annealing on multilayer film. Redaktorzy Lotfia Elnai i Ramy Mawad. Journal of Modern trends in physics research, grudzień 2014. http://dx.doi.org/10.19138/mtpr/(14)90-99.

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Lad, Robert J. Structural, electronic and chemical properties of metal/oxide and oxide/oxide interfaces and thin film structures. Office of Scientific and Technical Information (OSTI), grudzień 1999. http://dx.doi.org/10.2172/758832.

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Lee, You-Kee, Jung-Yeul Kim, Young-Ki Lee, Insoo Kim, Hee-Soo Moon, Jong-Wan Park, Craig P. Jacobson i Steven J. Visco. Conditioning effects on La1-xSrxMnO3-Yttria stabilized Zirconia electrodes for thin-film solid oxide fuel cells. Office of Scientific and Technical Information (OSTI), grudzień 2002. http://dx.doi.org/10.2172/810538.

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