Surface-treatment effects on organic thin-film transistors

Lim, Sang Chul; Kim, Seong Hyun; Lee, Jung Hun; Kim, Mi Kyung; Kim, Dojin; Zyung, Taehyoung

doi:10.1016/j.synthmet.2004.08.034

Cited by 208 publications

(115 citation statements)

References 8 publications

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“…Typically, in polymer systems, the component with the lower surface free energy segregates to the surface [27]. Since PETA is more hydrophobic than PEO [26], PETA should have lower surface free energy and would be expected to segregate to the surface [28,29]. Furthermore, the molecular weight difference between PETA and PEO should also affect the surface composition with the lower molecular weight PETA segregating to the surface [30].…”

Section: Resultsmentioning

confidence: 99%

X-ray Spectromicroscopy Study of Protein Adsorption to a Polystyrene−Polylactide Blend

et al. 2009

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Abstract:Synchrotron-based X-ray photoemission electron microscopy (X-PEEM) was used to characterize the near surface composition of polyethylene oxide (PEO) combined with 1.5, 5, and 10 wt-% pentaerythritol triacrylate (PETA) cross-linker. It was found that as the concentration of PETA increased, it became the dominant component in the top 10 nm of the film surface. The same surfaces were also exposed to human serum albumin (HSA) and the distributions of the protein relative to PEO and PETA were measured with X-PEEM. A positive correlation was found between levels of PETA and HSA at the surface. Above PETA concentrations of 5 wt-%, HSA adsorption was significant, which suggests high levels of PETA (often used to immobilize PEO by cross-linking) can significantly reduce the non-fouling properties of PEO.

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Section: Resultsmentioning

confidence: 99%

X-ray Spectromicroscopy Study of Protein Adsorption to a Polystyrene−Polylactide Blend

et al. 2009

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“…As a result, we obtained a surface which was completely wetted by hexadecane, corresponding to an interfacial energy of γ sl = 34 mJ/m 2 at room temperature. 6,13 For the lower interfacial energy substrate another identically cleaned silicon wafer was subsequently chemically coated with an OTS monolayer by immersing it in a solution of 50 g bicyclohexane, 2.8 g carbon tetrachloride, and 0.8 g OTS for 15 min and flushing afterward with chloroform to remove any cross-linked OTS chains. This procedure was repeated three times to ensure a fully covered substrate, and the resulting advancing contact angle of hexadecane was 40 • ± 2 • at 22 • C, 39 • ± 2 • at 40 • C, and 37.3 • ± 2 • at 60 • C. This corresponds to an interfacial energy of γ sl = 7.2 mJ/m 2 at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Depletion at solid/liquid interfaces: Flowing hexadecane on functionalized surfaces

Gutfreund

Wolff

Maccarini

et al. 2011

The Journal of Chemical Physics

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We present a neutron reflectivity study on interfaces in contact with flowing hexadecane, which is known to exhibit surface slip on functionalized solid surfaces. The single crystalline silicon substrates were either chemically cleaned Si(100) or Si(100) coated by octadecyl-trichlorosilane (OTS), which resulted in different interfacial energies. The liquid was sheared in situ and changes in reflectivity profiles were compared to the static case. For the OTS surface, the temperature dependence was also recorded. For both types of interfaces, density depletion of the liquid at the interface was observed. In the case of the bare Si substrate, shear load altered the structure of the depletion layer, whereas for the OTS covered surface no effect of shear was observed. Possible links between the depletion layer and surface slip are discussed. The results show that, in contrast to water, for hexadecane the enhancement of the depletion layer with temperature and interfacial energy reduces the amount of slip. Thus a density depletion cannot be the origin of surface slip in this system.

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“…One of the surface treatments carried out in experiments is self-assembled monolayers (SAMs) coating with OTS, which is considered to have hydrophobic properties, and the other is UV-ozone treatment known as hydrophilic treatment [44,45]. In SAMs coating, the surface is modified via the formation of an organic molecule film spontaneously aligned on the surface [44,46]. In this experiment, the fabricated nano-micro hybrid patterns were coated by a vapor deposition technique using OTS (Sigma-Aldrich) in which a long hydrocarbon chain is bonded to trichlorosilane.…”

Section: Variation Of Wettability With Surface Treatmentmentioning

confidence: 99%

Fabrication of Nano-Micro Hybrid Structures by Replication and Surface Treatment of Nanowires

et al. 2017

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Nanowire structures have attracted attention in various fields, since new characteristics could be acquired in minute regions. Especially, Anodic Aluminum Oxide (AAO) is widely used in the fabrication of nanostructures, which has many nanosized pores and well-organized nano pattern. Using AAO as a template for replication, nanowires with a very high aspect ratio can be fabricated. Herein, we propose a facile method to fabricate a nano-micro hybrid structure using nanowires replicated from AAO, and surface treatment. A polymer resin was coated between Polyethylene terephthalate (PET) and the AAO filter, roller pressed, and UV-cured. After the removal of aluminum by using NaOH solution, the nanowires aggregated to form a micropattern. The resulting structure was subjected to various surface treatments to investigate the surface behavior and wettability. As opposed to reported data, UV-ozone treatment can enhance surface hydrophobicity because the UV energy affects the nanowire surface, thus altering the shape of the aggregated nanowires. The hydrophobicity of the surface could be further improved by octadecyltrichlorosilane (OTS) coating immediately after UV-ozone treatment. We thus demonstrated that the nano-micro hybrid structure could be formed in the middle of nanowire replication, and then, the shape and surface characteristics could be controlled by surface treatment.

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Surface-treatment effects on organic thin-film transistors

Cited by 208 publications

References 8 publications

X-ray Spectromicroscopy Study of Protein Adsorption to a Polystyrene−Polylactide Blend

X-ray Spectromicroscopy Study of Protein Adsorption to a Polystyrene−Polylactide Blend

Depletion at solid/liquid interfaces: Flowing hexadecane on functionalized surfaces

Fabrication of Nano-Micro Hybrid Structures by Replication and Surface Treatment of Nanowires

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