Hydrophobic to hydrophilic transition of HF-treated Si surface during Langmuir–Blodgett film deposition

Bal, Jayanta Kumar; Kundu, Sarathi; Hazra, S.

doi:10.1016/j.cplett.2010.10.004

Cited by 32 publications

(20 citation statements)

References 43 publications

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“…LB films of mixed monolayer were grown on hydrophilic native oxide-covered Si and hydrophobic H-terminated Si in one (up) and two (down–up) strokes, respectively, at a surface pressure (π) of ≈30 mN/m. As native oxide is polar in nature, 33 deposition was made in upstroke (one stroke) sequence starting from the bottom of water subphase. In contrast, we followed reverse sequence, that is, down–up (two strokes) for apolar H-terminated Si.…”

Section: Results and Discussionmentioning

confidence: 99%

Vitamin C/Stearic Acid Hybrid Monolayer Adsorption at Air–Water and Air–Solid Interfaces

et al. 2018

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Because of the antioxidant activity of vitamin C (Vit C) polar heads, they can be used as a protective agent for fatty acids. Hence, the study on the growth of Vit C/stearic acid (SA) mixed binary films at air–water interface (known as Langmuir monolayer) and air–solid interface (known as Langmuir–Blodgett films) is of paramount interest. Although Vit C is situated at subsurface beneath SA molecules and interacts via hydrogen bonding between the hydroxyl groups of Vit C and SA, several Vit C molecules may infiltrate within SA two-dimensional matrix at the air–water interface. The increased mole fraction of Vit C (0.125–0.5) and the reduction of temperature (from 22 to 10 °C) of the subphase water result in an increase in the amount of adsorbed Vit C at the air–water interface. The surface pressure (π)–area ( A ) isotherms illustrate that such inclusion of Vit C provokes a spreading out of Vit C/SA binary monolayers, which leads to an alteration of different physicochemical parameters such as elasticity, Gibbs free energy of mixing, enthalpy, entropy, interaction energy parameter, and activity coefficient. However, being polar in nature, the transfer of pure Vit C on substrates gets affected. It can be transferred onto substrate by mixing suitably with SA as confirmed by infrared spectra. Their structures, extracted X-ray reflectivity, and atomic force microscopy (topography and phase imaging) are found to be strongly dependent on the nature of the substrate (hydrophilic and hydrophobic).

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Section: Results and Discussionmentioning

confidence: 99%

Vitamin C/Stearic Acid Hybrid Monolayer Adsorption at Air–Water and Air–Solid Interfaces

et al. 2018

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“…Generally, the SiH bond is hydrophobic and the SiN bond is hydrophilic due to its polarity and can react with water . Due to the quick reaction of SiNHSi with water in air, the content of the SiN moiety decreases quickly to be replaced by SiO bonds, whereas the reaction of SiH with oxygen is slow and needs a high temperature.…”

Section: Resultsmentioning

confidence: 99%

Hydrophobic, transparent and hard silicon oxynitride coating from perhydropolysilazane

Zhang

Shao

Luo

et al. 2015

Polymer International

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Silicon oxynitride coatings on glass and polyethylene terephthalate (PET) film have been fabricated by thermal annealing of inorganic polymer perhydropolysilazane (PHPS) between 60 °C and 200 °C. The chemical structure, thermal behavior and structural evolution of PHPS were investigated. The coatings obtained on glass possess pencil hardness as high as 9H, high transparency above 90% in the visible wavelength range, good adhesion to the substrate and a hydrophobic property with water contact angle above 98°. The PHPS coated PET film has pencil hardness above 4H, water contact angle 102° and a high scratch resistance property with no obvious scratches after a 50 cycles scratch test under a load of 2 kg. All these data imply the great potential of PHPS as a hard coating for optical devices. © 2015 Society of Chemical Industry

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“…It is known that hydrophilicity of Si originating from the presence of singular and associated OH groups on its surface could be obtained by boiling it in an H 2 O 2 solution at 100 • C for several minutes (Bal et al 2010b). In contrast, the hydrophobic Si surface state, mainly characterized by Si-H or Si-O-CH 3 groups, could be obtained by wet chemical treatment involving HF acid or photoresists (Grundner and Jacob 1986, Bal et al 2010a, 2010b. UV lasers have also been used to induce chemical or thermal dissociation and adsorption of different gases (methanol, water vapour, etc) on the Si surface (Koehler et al 1989, Tanaka et al 1993.…”

Section: Introductionmentioning

confidence: 99%

Selective areain situconversion of Si (0 0 1) hydrophobic to hydrophilic surface by excimer laser irradiation in hydrogen peroxide

Liu¹,

Huang²,

Dubowski³

2014

J. Phys. D: Appl. Phys.

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We report on a method of rapid conversion of a hydrophobic to hydrophilic state of an Si (0 0 1) surface irradiated with a relatively low number of pulses of an excimer laser. Hydrophilic Si (0 0 1), characterized by the surface contact angle (CA) of near 15 • , is fabricated following irradiation with either KrF or ArF excimer lasers of hydrophobic samples (CA ∼ 75 •) immersed in a 0.01% H 2 O 2 /H 2 O solution. The chemical and structural analysis carried with x-ray photoelectron spectroscopy and atomic force microscopy measurements confirmed the formation of OH-terminated Si (0 0 1) surface with no detectable change in the surface morphology of the laser-irradiated material. To investigate the efficiency of this laser-induced hydrophilization process, we demonstrate a selective area immobilization of biotin-conjugated fluorescein-stained nanospheres outside of the laser-irradiated area. The results demonstrate the potential of the method for the fabrication of biosensing architectures and advancements of the Si-based microfluidic device technology.

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Hydrophobic to hydrophilic transition of HF-treated Si surface during Langmuir–Blodgett film deposition

Cited by 32 publications

References 43 publications

Vitamin C/Stearic Acid Hybrid Monolayer Adsorption at Air–Water and Air–Solid Interfaces

Vitamin C/Stearic Acid Hybrid Monolayer Adsorption at Air–Water and Air–Solid Interfaces

Hydrophobic, transparent and hard silicon oxynitride coating from perhydropolysilazane

Selective areain situconversion of Si (0 0 1) hydrophobic to hydrophilic surface by excimer laser irradiation in hydrogen peroxide

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