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Showing 1 to 20 of 37 for “"HOPG"”.
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Modeling real world phenomena using molecular dynamics and continuum simulations
… silica aggregates have been performed on the HOPG and crystalline quartz surface. The ice-like argon aggregate showed tendency to deform and fragment upon contact with the surface while the more rigid amorphous SiO 2 aggregate retained its structure and gained rotational energy upon contact …
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Obtención por vía electroquímica y caracterización de estructuras metálicas
… bimetálico Rh-Pd, sobre sustratos carbonosos de HOPG y CV. Para ello, se emplearon técnicas electroquímicas convencionales y de caracterización superficial, tales como microscopía STM y AFM ex-situ, SEM, EDX y XPS. Las potenciales propiedades electrocatalíticas para la reacción de hidrógeno …
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Towards identifying platinum anchor sites on carbon via a model electrochemical system
… i.e. highly orientated pyrolytic graphite (HOPG) and mirror finish graphite (MFG) quartz crystal, to incorporate oxygen terminated groups into the graphitic matrix. This study focusses on potential cycling to determine the mobility of Pt across these carbon surfaces and the effect of the Pt …
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Engineering Gold Nanoparticles And Their Use To Control Nucleation
… prepared on highly ordered pyrolytic graphite (HOPG) substrate by the electrocrystallization method. An aqueous solution of 0.05 to 1 mM Hydrogen tetrachloroaurate (HAuCl4) with 0.1 mM (Potassium chloride) KCl as the supporting electrolyte was prepared. The electrodeposition of the AuNPs was …
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Optical Properties of Organic Semiconductors: from Submonolayers to Crystalline Films
… substrates used, i.e., mica, glass, Au(111), and HOPG, the direct interpretation of the DRS signal is not feasible. Therefore, we have proposed a method by which the calculation of the optical constants n (index of refraction) and k (absorption index) of thin films on arbitrary substrates from …
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Interfacial Electronic Structure of Dipolar Vanadyl Naphthalocyanine Thin Films
… substrates: highly ordered pyrolytic graphite (HOPG) and Au(111).The substrate of HOPG is a surface which does not possess reactive dangling bonds and the electron density close to the Fermi edge is very low, permitting high resolution spectroscopic band analysis of VONc and revealing subtle …
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Imaging and spectroscopy of nanostructured surfaces
… of large size selected clusters of Pd on HOPG show that the aspect ratio increases with increasing cluster size. The non-spherical nature of these clusters is traced back to the aggregation regime in the gas condensation cluster source. The size and temperature of the clusters create a …
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Photoelectron Spectroscopy of highly oriented pyrolytic graphite using intense ultrashort laser pulses
… surface of Highly Oriented Pyrolytic Graphite (HOPG) using ultrashort laser pulses. It concentrates on the observation and understanding of a new phenomenon whereby infrared laser pulses of just 1.5eV photon energy can be used to generate photoelectrons with kinetic energies of up to 80eV. …
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Light induced reduction of individual graphene oxide films
… films on highly oriented pyrolytic graphite (HOPG). Thin gold films of various thickness (5, 10 and 50 nm) were sputtered on HOPG and annealed at different temperatures (200-500 °C). The films were found to break apart and coalesce into clusters of different morphologies at different …
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Nanostrukturierte Fullerenschichten für organische Bauelemente
… hergestellt. Als Substratmaterial wurden HOPG (Graphit), Glimmer und einkristallines Silizium verwendet. Die größten einkristallinen Bereiche werden auf HOPG-Substraten erhalten. Die laterale Ausdehnung der C60-Kristallite parallel zu den Graphitstufen kann bis zu 50 µm erreichen, …
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Use of molecular dynamics simulations to study the impact of weak to strong non-covalent chemical interactions
… the number of surface layers used to model the HOPG surface and the carbon-nitrogen Lennard-Jones potential are important in improving the agreement between the simulations and the experiments. Trajectory MD simulations were also performed on quartz surface to study the difference between …
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Síntesis de nanopartículas bimetálicas soportadas para su aplicación en la reducción electroquímica de iones nitratos
… soportadas sobre sustratos carbonosos de CV y HOPG. Las mismas fueron obtenidas a partir de soluciones acuosas conteniendo los iones de dichos metales empleando técnicas electroquímicas convencionales y caracterizadas mediante microscopía AFM ex-situ, SEM-EDX y XPS. Inicialmente, se analizó el …
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Morphology-Property Relationship for Binary Organic Thin Films
… binary mixture of DH6T and PCBM thin films on HOPG through Atomic Force Microscopy (AFM) and Kelvin Probe Force Microscope (KPFM). Films of pure DH6T and pure PCBM and their mixture films were systematically analyzed to reveal topography and surface potential of different phases. This study …
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Electrochemical studies of carbon monoxide oxidation on platinum and platinum based fuel cell catalysts
… of a glassy carbon or a highly ordered graphite (HOPG) electrode. In the case of HOPG, additional characterization of the particles was performed by atomic force microscopy (AFM) measurements. The electrochemistry of CO on Pt catalyst particles was similar to responses for CO on polycrystalline …
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Scanning probe investigations of magnetic thin films and nanostructures
… stabilized cobalt nanoparticles deposited on HOPG by means of conducting atomic force microscopy. The current-voltage curves showed gaps corresponding with the band gap of CoO/Co3O4 nanostructures.
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Application of scanning micro-tip and UHV Kelvin probes in surface and material characterisation.
… cleaved highly orientated pyrolytic graphite (HOPG) with freshly sputtered Gold surfaces for ambient environment tip calibration. A new actively shielded upsilon-tip (200 upsilon m diameter) is introduced to increase spatial resolution for CPD and topographic scans in order resolve features in …
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Elektrochemische Prozesse an strukturierten Substraten für Anwendungen in neuartigen Leitungstechnologien
… dienten hochorientierter pyrolytischer Graphit (HOPG), selbstaggregierte Thiolmonolagen auf Gold und Hydroxybiphenylmonolagen auf Silicium. Die Monolagen konnten hier mittels Bestrahlung mit niederenergetischen Elektronen strukturiert werden. Auf derartigen Substraten kann eine selektive …
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Functional materials for thermal regulation
… of highly-oriented pyrolytic graphite (HOPG). The in-plane thermal conductivity varies with deposition temperature between 650 and 1000 W m−1 K−1, and is 30-50% of the in-plane thermal conductivity of HOPG. The reduced thermal conductivity in comparison to HOPG is attributed to a …
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Evaluations of single walled carbon nanotubes using resonance Raman spectroscopy
… modes in highly ordered pyrolytic graphite (HOPG), in SWNT bundles, and in isolated SWNTs. We found both dispersive and non-dispersive Raman bands in the range 1650-2100 cm⁻¹, and we show that the appearance and frequency vs. laser energy E[laser] behavior of these features are in agreement …
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Structural Characterization of Thin Films of Molecules on Solid Surfaces: Development of a Portable UHV Chamber to Bridge RHEED and SFG Spectroscopy Techniques
… of ILs on highly-oriented pyrolytic graphite (HOPG) was observed by RHEED, where an ordered structure for 2–10-nm films was found at low temperatures while no apparent 3D crystallization was found for films thinner than 2 nm nominally and thicker than ~10 nm. An open question about the …
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