Wetting Behavior of Porous Silicon Surfaces Functionalized with a Fulleropyrrolidine

Dattilo, Davide; Armelao, Lidia; Maggini, Michele; Fois, Giovanni; Mistura, Giampaolo

doi:10.1021/la060833o

Cited by 30 publications

(26 citation statements)

References 61 publications

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“…[36] www.chemeurj.org ic chains. In addition, C 60 is less hydrophobic than the hydrocarbon group; the C 60 film has lower water contact angles than the alkane monolayer (75-1008 for C 60 and 1108 for alkane film), [50][51][52][53][54][55][56] and in situ X-ray reflectivity of the Langmuir monolayer of 2 indicated that the C 60 moieties are located adjacent to the water (Figure 2a). [48] Accordingly, in a relatively polar environment, unlike that of ionic C 60 amphiphile (Scheme 1), the C 60 group form the surface of the assembly.…”

Section: Conceptmentioning

confidence: 99%

Fullerene Derivatives That Bear Aliphatic Chains as Unusual Surfactants: Hierarchical Self‐Organization, Diverse Morphologies, and Functions

Asanuma

Nakanishi

et al. 2010

Chemistry A European J

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Conventionally, amphiphiles are composed of hydrophobic and hydrophilic units. They are able to exhibit a wide variety of structures depending on the environment. Such features have been applied in supramolecular chemistry, by which apolar and polar groups are implemented in the molecular design. Here we present an attractive approach to introduce unique amphiphilicity. Relatively simple fullerene (C(60)) derivatives that bear long aliphatic chains behave as uncommon surfactants in organic media. Although two hydrophobic units are used to assemble the derivatives, slight differences in their polarity and chemical nature may make them incompatible and thus arrange them in microphase-separated mesostructures as lamellar ones. These assemblies are maintained by relatively weak forces, pi-pi interactions among C(60) moieties and van der Waals forces between alkyl chains. Therefore, the derivatives can undergo "supramolecular polymorphism" by which different supramolecular assemblies arise by changing the conditions of assembly. A simple modification in their substituent motif of derivatives influences the intermolecular interactions and provides a wide variety of supramolecular materials.

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Section: Conceptmentioning

confidence: 99%

Fullerene Derivatives That Bear Aliphatic Chains as Unusual Surfactants: Hierarchical Self‐Organization, Diverse Morphologies, and Functions

Asanuma

Nakanishi

et al. 2010

Chemistry A European J

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“…While morphology is usually controlled at fabrication stage [11], surface chemical bond composition can be modified during postprocessing steps which have been the focus of many research activities. As a result, approaches using molecular grafting [12,13], UV photosensitive molecular coating [14,15], electrochemical methods [16], and so forth have been reported. However, despite some success, these reported approaches are neither efficient nor practical for the precise control of p-Si surface wetting properties.…”

Section: Introductionmentioning

confidence: 99%

Surface Wettability of Oxygen Plasma Treated Porous Silicon

Jiang

Wang

et al. 2014

Journal of Nanomaterials

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Oxygen plasma treatment on porous silicon (p-Si) surfaces was studied as a practical and effective means to modify wetting properties of as-fabricated p-Si surfaces, that is, contact angles of the p-Si materials. P-Si samples spanning a wide range of surface nanostructures have been fabricated which were subjected to a series of oxygen plasma treatments. Reduction of the p-Si surface contact angles has been systematically observed, and the surface activation rate constant as a function of different pore geometries has been analyzed to achieve an empirical equation. The underlying diffusion mechanisms have been discussed by taking into account of different pore diameters of p-Si samples. It is envisaged that such an approach as well as the corresponding empirical equation may be used to provide relevant process guidance in order to achieve precise control of p-Si contact angles, which is essential for many p-Si applications especially in biosensor areas.

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“…XPS on Si-H samples showed only adventitious carbon and oxygen contaminants on the Si surface, as reported in literature for similar Si(100) etching procedures. 19 AFM images of Si-H are reported in Figure 1, together with the surface profile recorded along the path highlighted in blue. The Si-H sample appears flat, with a roughness of 0.1 nm and no particular morphological feature.…”

Section: Resultsmentioning

confidence: 99%

“…[13][14][15][16] [60]fullerene and its derivatives have been widely used to develop hybrid materials where the peculiar properties of this fascinating spherical molecule are transferred onto various surfaces. 17,18 Some noticeable examples are the wettability modulation of porous silicon 19 and the modification of electronic properties of semiconductors thanks to the electronaccepting characteristics of the fullerene sphere. [20][21][22][23] In the mentioned cases, the fullerene cage was functionalized with appropriate grafting groups for the bonding to the surface.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of [60]fullerene on silicon surfaces through a calix[8]arene layer

Busolo

Silvestrini

Armelao

et al. 2013

The Journal of Chemical Physics

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In this work, we report the functionalization of flat Si(100) surfaces with a calix[8]arene derivative through a thermal hydrosilylation process, followed by docking with [60]fullerene. Chemical grafting of calix[8]arene on silicon substrates was evaluated by X-ray photoelectron spectroscopy, whereas host-guest immobilization of fullerene was demonstrated by atomic force microscopy and sessile drop water contact angle measurements. Surface topographical variations, modelled on the basis of calix[8]arene and [60]fullerene geometrical parameters, are consistent with the observed morphological features relative to surface functionalization and to non-covalent immobilization of [60]fullerene.

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Wetting Behavior of Porous Silicon Surfaces Functionalized with a Fulleropyrrolidine

Cited by 30 publications

References 61 publications

Fullerene Derivatives That Bear Aliphatic Chains as Unusual Surfactants: Hierarchical Self‐Organization, Diverse Morphologies, and Functions

Fullerene Derivatives That Bear Aliphatic Chains as Unusual Surfactants: Hierarchical Self‐Organization, Diverse Morphologies, and Functions

Surface Wettability of Oxygen Plasma Treated Porous Silicon

Immobilization of [60]fullerene on silicon surfaces through a calix[8]arene layer

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