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6 results on '"Speets, E.A."'

2. Advances in Single-Molecule Magnet Surface Patterning through Microcontact Printing

Author

Mannini, Matteo, Bonacchi, D., Bonacchi, Daniele, Zobbi, Laura, Piras, Federica M., Speets, E.A., Caneschi, Andrea, Cornia, Andrea, Magnani, Agnese, Ravoo, B.J., Reinhoudt, David, Sessoli, Roberta, Gatteschi, Dante, and Inorganic Materials Science

Subjects
Nanostructure, Surface Properties, Bioengineering, Nanotechnology, IR-53105, Magnetics, Cluster (physics), micro-contact printing, General Materials Science, Single-molecule magnet, single-molecule magnets, Particle Size, Lithography, METIS-225409, Manganese, Chemistry, Mechanical Engineering, Self-assembled monolayer, General Chemistry, Condensed Matter Physics, Nanostructures, self-assembled monolayers, mass spectrometry, lithography, manganese, cluster complexes, Secondary ion mass spectrometry, Magnet, Microcontact printing, Printing, AFM, ToF-SIMS, Crystallization
Abstract

We present an implementation of strategies to deposit single-molecule magnets (SMMs) using microcontact printing microCP). We describe different approaches of microCP to print stripes of a sulfur-functionalized dodecamanganese (III, IV) cluster on gold surfaces. Comparison by atomic force microscopy profile analysis of the patterned structures confirms the formation of a chemically stable single layer of SMMs. Images based on chemical contrast, obtained by time-of-flight secondary ion mass spectrometry, confirm the patterned structure.

Published
2005
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3. Surface-Confined Single Molecules: Assembly and Disassembly of Nanosize Coordination Cages on Gold (111)

Author

Menozzi, E., Menozzi, Edoardo, Pinalli, Roberto, Speets, E.A., Ravoo, B.J., Dalcanale, Enrico, and Reinhoudt, David

Subjects
Chemistry, fungi, Organic Chemistry, food and beverages, Cavitand, General Chemistry, Catalysis, chemistry.chemical_compound, Scanning probe microscopy, Crystallography, Thioether, Coordination cage, IR-49530, Pyridine, Monolayer, Molecule, Self-assembly, METIS-222109
Abstract

A cavitand functionalized with four alkylthioether groups at the lower rim, and four tolylpyridine groups on the upper rim is able to bind to a gold surface by its thioether groups, and forms a coordination cage with [Pd(dppp)(CF(3)SO(3))(2)] by its pyridine groups. The cavitand or the cage complex can be inserted from solution into a self-assembled monolayer (SAM) of 11-mercaptoundecanol on gold. The inserted molecules can be individually detected as they protrude from the SAM by atomic force microscopy (AFM). The cages can be reversibly assembled and disassembled on the gold surface. AFM can distinguish between single cavitand and cage molecules of 2.5 nm and 5.8 nm height, respectively.

Published
2004
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4. Formation of metal nano- and micro-patterns on self-assembled monolayers using pulsed laser deposition through nanostencils and electroless deposition

Author

Speets, E.A., te Riele, P.M., van den Boogaart, M.A.F., Doeswijk, L.M., Ravoo, B.J., Rijnders, Augustinus J.H.M., Brugger, J.P., Brugger, Jürgen, Reinhoudt, David, Blank, David H.A., Inorganic Materials Science, and Faculty of Science and Technology

Subjects
Materials science, IR-59187, METIS-235016, Nanotechnology, Self-assembled monolayer, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Pulsed laser deposition, Biomaterials, X-ray photoelectron spectroscopy, Monolayer, Nano, Electrochemistry, Thin film, EC Grant Agreement nr.: FP6/500120, Deposition (law), Micropatterning
Abstract

Patterns of noble-metal structures on top of self-assembled monolayers (SAMs) on Au and SiO2 substrates have been prepared following two approaches. The first approach consists of pulsed laser deposition (PLD) of Pt, Pd, Au, or Cu through nano- and microstencils. In the second approach, noble-metal cluster patterns deposited through nano- and microstencils are used as catalysts for selective electroless deposition (ELD) of Cu. Cu structures are grown on SAMs on both Au and SiO2 substrates and are subsequently analyzed using X-ray photoelectron spectroscopy element mapping, atomic force microscopy, and optical microscopy. The combination of PLD through stencils on SAMs followed by ELD is a new method for the creation of (sub)-micrometer-sized metal structures on top of SAMs. This method minimizes the gas-phase deposition step, which is often responsible for damage to, or electrical shorts through, the SAM.

Published
2006

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