Nanometer space resolved photochemistry

Feyter, Steven De; Hofkens, Johan; Auweraer, Mark Van der; Nolte, Roeland J. M.; Müllen, Kläus; Schryver, F. C. De

doi:10.1039/b009416l

Cited by 24 publications

(18 citation statements)

References 58 publications

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“…On this hydrophilic carbon-coated glass substrate, no additional annealing was needed as was reported to be necessary on glass surfaces. [40] The fluorescence microscopy images were also recorded with orthogonally polarized excitation and detection (Figure 5c and d), which resulted in a > 80 % reduction of the overall fluorescence intensity of the rings.…”

Section: Resultsmentioning

confidence: 99%

“…Initial studies have suggested that the porphyrin molecules are randomly oriented within the rings. [14,40,41] Annealing of the rings allowed the molecules to order to some extent, however, the precise ordering within the rings has not yet been determined. In order to achieve complete understanding of the ring-formation process and of the ordering within the rings more extensive combined microscopy and spectroscopy studies have been carried out.…”

Section: Introductionmentioning

confidence: 98%

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Aided Self‐Assembly of Porphyrin Nanoaggregates into Ring‐Shaped Architectures

Lensen

Takazawa

Elemans

et al. 2004

Chemistry A European J

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The formation of micrometer-sized, highly ordered porphyrin rings on surfaces has been investigated. The porphyrin-based nanoarchitectures are formed by deposition from evaporating solutions through a surface dewetting process which can be tuned by variations in the substitution pattern of the molecules used, the coating of the surface and the conditions under which the evaporation takes place. Control over the combined self-assembly and surface dewetting results in nanorings possessing a defined internal architecture. The ordering of the molecules within the rings has been studied by a variety of microscopy techniques (TEM, AFM, fluorescence microscopy) and the exact ordering of the porphyrins within the rings has been quantified.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Aided Self‐Assembly of Porphyrin Nanoaggregates into Ring‐Shaped Architectures

Lensen

Takazawa

Elemans

et al. 2004

Chemistry A European J

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“…[39] STM is also an important tool for investigating supramolecular self-assembly of molecules within monolayers and epitaxial growth of double and multilayers [40] and has even been used to study photoinduced chemical reactions within monolayers. [39,41,42] Another scanning technique that is used to investigate nanostructures is atomic force microscopy (AFM) [43] -sometimes also called scanning force microscopy (SFM). In an AFM experiment the contact force between a tip and the surface is measured at each point as the surface is scanned.…”

Section: Probing Visualizing and Manipulating Single Molecules By Smentioning

confidence: 99%

The Chemistry of Organic Nanomaterials

2005

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The development of nanotechnology using organic materials is one of the most intellectually and commercially exciting stories of our times. Advances in synthetic chemistry and in methods for the investigation and manipulation of individual molecules and small ensembles of molecules have produced major advances in the field of organic nanomaterials. The new insights into the optical and electronic properties of molecules obtained by means of single-molecule spectroscopy and scanning probe microscopy have spurred chemists to conceive and make novel molecular and supramolecular designs. Methods have also been sought to exploit the properties of these materials in optoelectronic devices, and prototypes and models for new nanoscale devices have been demonstrated. This Review aims to show how the interaction between synthetic chemistry and spectroscopy has driven the field of organic nanomaterials forward towards the ultimate goal of new technology.

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“…Various large molecules have been investigated by SNOM [18], AFM [13] [19], and STM [20] (for a review, see [21]) according to different approaches: SPM in a dry environment (under ambient conditions or in vacuum) (for a review, see [22]) and in a wet environment (at the solid-liquid interface (for a review, see [23]) or with electrochemical methods [24]). All methods can be performed at various temperatures.…”

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confidence: 99%

Hourglass‐Shaped Dendrimers on Surfaces: A Comparison of Different Scanning‐Tunneling‐Microscopy Approaches

Widmer

Hubler

Stöhr

et al. 2002

Helvetica Chimica Acta

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Dedicated to Professor Dieter Seebach on the occasion of his 65th birthday Large molecules adsorbed on surfaces can be analyzed by scanning tunneling microscopy (STM) under various environmental conditions: on a dry surface in air or vacuum, and at the solid-liquid interface. However, can measurements under dissimilar conditions be compared, e. g., when sample A was studied at the solid-liquid interface and sample B in a dry environment? Only rarely can the same substance be examined with more than one approach, since completely different set-up and preparations are necessary. Furthermore, few substances are suitable for several methods of sample preparation and characterization. We have chosen a large, flexible, nonplanar molecule, namely an alkoxy-substituted second-generation dendritic compound with a chiral core unit, which is peculiar for its −hourglass× conformation. The assembly properties have been explored by STM both in solution-cast self-organized monolayers (SOMs) and multilayer films, as well as at the solid-liquid interface. The complexity and limits of the three approaches applied to our hourglass-shaped dendritic compound are discussed. Depending on the approach and environmental conditions, several quality levels of image resolution could be achieved; measurements carried out at low temperatures led to highest resolution on the aromatic parts of the molecule. A comparison of equally sized images obtained under these varying conditions reveals not only different packing arrangements, but also spots of unlike shape. Therefore, when the approach, preparation, and/or environmental conditions are not the same, STM measurements of different compounds have to be compared with greatest care.

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Nanometer space resolved photochemistry

Cited by 24 publications

References 58 publications

Aided Self‐Assembly of Porphyrin Nanoaggregates into Ring‐Shaped Architectures

Aided Self‐Assembly of Porphyrin Nanoaggregates into Ring‐Shaped Architectures

The Chemistry of Organic Nanomaterials

Hourglass‐Shaped Dendrimers on Surfaces: A Comparison of Different Scanning‐Tunneling‐Microscopy Approaches

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