Self‐assembled monolayers on silicon oxide

Belgardt, Christian; Graaf, Harald; Baumgärtel, Thomas; Borczyskowski, C. von

doi:10.1002/pssc.200982471

Cited by 11 publications

(11 citation statements)

References 31 publications

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“…The saturated γ values ( γ P ) are higher than the surface energy, 23.7 mJ/cm 2 , of a densely packed SAM surface. [ 11 ] This behavior is attributed to the different coverage of the alkyl chains of OTS on the three different surfaces. The ratio ( γ -γ 0 )/ ( γ P -γ 0 ) shown in Figure 1 c approximates the alkyl chain coverage on the surfaces.…”

Section: Doi: 101002/adma201201697mentioning

confidence: 98%

Alignment of Liquid Crystals Using a Molecular Layer with Patterned Molecular Density

et al. 2012

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The surface of self-constructed molecular density modulation (SDM) exhibits a wide range of liquid crystal alignment capabilities including planar, tilted, and homeotropic alignments, disclination-free uniform and heterogeneous alignments, and even spatially varying alignments through the single non-contact process. Alignment defects are eliminated by temporary lowering the frictional energy barrier via the open-boundary elastic stabilization (OES) treatment.

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Section: Doi: 101002/adma201201697mentioning

confidence: 98%

Alignment of Liquid Crystals Using a Molecular Layer with Patterned Molecular Density

et al. 2012

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“…The few surface hydroxy groups also lead to a much slower binding rate of OTS to the LAO oxide. Even after several hours in the OTS solution, the surface was not fully covered with OTS, whereas for “piranha”-cleaned silica a fractional surface coverage near unity was reported within a few minutes [29,35]. …”

Section: Resultsmentioning

confidence: 99%

Selective surface modification of lithographic silicon oxide nanostructures by organofunctional silanes

Baumgärtel¹,

Borczyskowski²,

Graaf³

2013

Beilstein J. Nanotechnol.

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SummaryThis study investigates the controlled chemical functionalization of silicon oxide nanostructures prepared by AFM-anodization lithography of alkyl-terminated silicon. Different conditions for the growth of covalently bound mono-, multi- or submonolayers of distinctively functional silane molecules on nanostructures have been identified by AFM-height investigations. Routes for the preparation of methyl- or amino-terminated structures or silicon surfaces are presented and discussed. The formation of silane monolayers on nanoscopic silicon oxide nanostructures was found to be much more sensitive towards ambient humidity than, e.g., the silanization of larger OH-terminated silica surfaces. Amino-functionalized nanostructures have been successfully modified by the covalent binding of functional fluorescein dye molecules. Upon excitation, the dye-functionalized structures show only weak fluorescence, which may be an indication of a relatively low surface coverage of the dye molecules on length scale that is not accessible by standard AFM measurements.

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“…The OTS treatment forms an organic monolayer of OTS molecules covalently bound to the silicon oxide of all three kinds of substrates. The OTS treatment procedure is described in detail by Belgardt et al 26 resulting in hydrophobic surfaces proved by determining the water contact angle (of about 105° for OTS covered samples and 55° without OTS with respect to the surface).…”

Section: Methodsmentioning

confidence: 99%

Interface properties of OFETs based on an air‐stable n‐channel perylene tetracarboxylic diimide semiconductor

Lüttich¹,

Lehmann²,

Friedrich³

et al. 2011

Physica Status Solidi (a)

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In this study, several experimental techniques were employed to gain insights into the molecular interactions at the interfaces in organic field-effect transistors (OFETs). A self-assembled monolayer (SAM) was applied to the gate insulator to influence the interactions at the interface. Macroscopic electrical measurements, microscopic potentiometry, absorption/luminescence spectroscopy, and ellipsometry are combined to study top-contact OFETs based on an air-stable n-channel perylene derivative. They show clearly the advantage and capability of local electrical investigations compared to DC electrical characterization. The DC electrical measurements provide an improvement of the electron mobilities within the channel and unchanged contact resistances (within the error bars). Only the potentiometry allowed a deeper insight: It reveals a small decrease of the source contact resistance and a drain bias dependence of the mobility, which decreases due to prior hydrophobization of the SiO 2 gate insulator. This is attributed to different charge carrier trap concentrations and injection barriers in the organic semiconductor near the dielectric interface caused by diffused water which is discussed in detail. The optical absorption/luminescence spectroscopy and ellipsometry indicate an unchanged ordered molecular arrangement with a molecular tilt angle of (33 AE 4)8 with respect to the dielectric surface and rather weak intermolecular interaction for the devices with treated and untreated SiO 2 .

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Self‐assembled monolayers on silicon oxide

Cited by 11 publications

References 31 publications

Alignment of Liquid Crystals Using a Molecular Layer with Patterned Molecular Density

Alignment of Liquid Crystals Using a Molecular Layer with Patterned Molecular Density

Selective surface modification of lithographic silicon oxide nanostructures by organofunctional silanes

Interface properties of OFETs based on an air‐stable n‐channel perylene tetracarboxylic diimide semiconductor

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