Self‐assembled silane monolayers: an efficient step‐by‐step recipe for high‐quality, low energy surfaces

Lessel, Matthias; Bäumchen, Oliver; Klos, Mischa; Hähl, Hendrik; Fetzer, Renate; Paulus, Michael; Seemann, Ralf; Jacobs, Karin

doi:10.1002/sia.5729

Cited by 109 publications

(136 citation statements)

References 66 publications

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“…The glass slides were then placed in a DCDMS solution for 15 minutes and thereafter flushed with chloroform to wash off the unreacted silanol groups from the surface, followed by another 45-minute treatment in DCDMS. 37,38 The modified films were dried using nitrogen gas.…”

Section: Surface Modificationmentioning

confidence: 99%

Antimicrobial performance of mesoporous titania thin films: role of pore size, hydrophobicity, and antibiotic release

Atefyekta¹,

Ercan²,

Karlsson³

et al. 2016

IJN

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Implant-associated infections are undesirable complications that might arise after implant surgery. If the infection is not prevented, it can lead to tremendous cost, trauma, and even life threatening conditions for the patient. Development of an implant coating loaded with antimicrobial substances would be an effective way to improve the success rate of implants. In this study, the in vitro efficacy of mesoporous titania thin films used as a novel antimicrobial release coating was evaluated. Mesoporous titania thin films with pore diameters of 4, 6, and 7 nm were synthesized using the evaporation-induced self-assembly method. The films were characterized and loaded with antimicrobial agents, including vancomycin, gentamicin, and daptomycin. Staphylococcus aureus and Pseudomonas aeruginosa were used to evaluate their effectiveness toward inhibiting bacterial colonization. Drug loading and delivery were studied using a quartz crystal microbalance with dissipation monitoring, which showed successful loading and release of the antibiotics from the surfaces. Results from counting bacterial colony-forming units showed reduced bacterial adhesion on the drug-loaded films. Interestingly, the presence of the pores alone had a desired effect on bacterial colonization, which can be attributed to the documented nanotopographical effect. In summary, this study provides significant promise for the use of mesoporous titania thin films for reducing implant infections.

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Section: Surface Modificationmentioning

confidence: 99%

Antimicrobial performance of mesoporous titania thin films: role of pore size, hydrophobicity, and antibiotic release

Atefyekta¹,

Ercan²,

Karlsson³

et al. 2016

IJN

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“…To change the solid/liquid boundary condition as well as the surface energy, the second type additionally incorporated a SAM composed of alkylsilane molecules (dodecyltrichlorosilane, DTS, Sigma-Aldrich, Darmstadt, Germany) with b ≈ 500 nm h 0 [23,24][28]. As described in detail elsewhere [29], the RMS surface roughness of a DTS coated SiO 2 -substrate is identical to a bare one (approx. 0.2 nm), while providing a surface energy γ DTS = 26(1) mJ/m 2 and leading to an equilibrium contact angle θ Y = 66 (2) • for PS.…”

mentioning

confidence: 99%

“…For details see Ref. [29]. PS was spincast from toluene (chromatography grade, Merck, Darmstadt, Germany) onto a mica sheet (V2 Grade, PLANO GmbH, Wetzlar, Germany) and then annealed at 80…”

mentioning

confidence: 99%

“…The Hamaker coefficient, A = 2.05 × 10 −20 J, is taken as that for the air/PS/SiO 2 [35] system for both cases since the optical index of refraction of DTS is nearly identical to that of SiO 2 [5,17,29,36]. C is chosen to obtain the appropriate contact angle through φ(h min ) = σ(1 − cos θ Y ) [4,5,13], where h min is the • C, except for the thickest film for which it was necessary to increase the temperature to 65…”

mentioning

confidence: 99%

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Nucleated dewetting in supported ultra-thin liquid films with hydrodynamic slip

et al. 2017

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This study reveals the influence of the surface energy and solid/liquid boundary condition on the breakup mechanism of dewetting ultra-thin polymer films. Using silane self-assembled monolayers, SiO2 substrates are rendered hydrophobic and provide a strong slip rather than a no-slip solid/liquid boundary condition. On undergoing these changes, the thin-film breakup morphology changes dramatically -from a spinodal mechanism to a breakup which is governed by nucleation and growth. The experiments reveal a dependence of the hole density on film thickness and temperature. The combination of lowered surface energy and hydrodynamic slip brings the studied system closer to the conditions encountered in bursting unsupported films. As for unsupported polymer films, a critical nucleus size is inferred from a free energy model. This critical nucleus size is supported by the film breakup observed in the experiments using high speed in situ atomic force microscopy.

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“…High selectivity toward a single gas species can be achieved via the binding of the analyte gas with free organic functional groups anchored on the sensor surface. In this respect, modifying the inorganic semiconductors surface with self-assembled monolayers (SAMs) has attracted an increased interest in different fields of applications such as biosensors, biomolecular electronics, and gas sensors [9][10][11][12] . This can be attributed to their rich and tunable functionalities which can provide a selective binding interaction between these organic receptors and target molecular species 13,14 .…”

mentioning

confidence: 99%

Integrated Strategy toward Self-Powering and Selectivity Tuning of Semiconductor Gas Sensors

et al. 2016

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Inorganic conductometric gas sensors struggle to overcome limitations in high power consumption and poor selectivity. Herein, recent advances in developing self-powered gas sensors with tunable selectivity are introduced. Alternative general approaches for powering gas sensors were realized via proper integration of complementary functionalities (namely; powering and sensing) in a singular heterostructure. These solar light driven gas sensors operating at room temperature without applying any additional external powering sources are comparatively discussed. The TYPE-1 gas sensor based on integration of pure inorganic interfaces (e.g. CdS/n-ZnO/p-Si) is capable of delivering a self-sustained sensing response, while it shows a non-selective interaction towards oxidizing and reducing gases. The structural and the optical merits of TYPE-1 sensor are investigated giving more insights into the role of light activation on the modulation of the selfpowered sensing response. In the TYPE-2 sensor, the selectivity of inorganic materials is tailored through surface functionalization with self-assembled organic monolayers (SAMs). Such hybrid interfaces (e.g. SAMs/ZnO/p-Si) have specific surface interactions with target gases compared to the non-specific oxidation-reduction interactions governing the sensing mechanism of simple inorganic sensors. The theoretical modeling using density functional theory (DFT) has been used to simulate the sensing behavior of inorganic/organic/gas interfaces, revealing that the alignment of organic/gas frontier molecular orbitals with respect to the inorganic Fermi level is the key factor for tuning selectivity. These platforms open new avenues for developing advanced energy-neutral gas sensing devices and concepts.

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Self‐assembled silane monolayers: an efficient step‐by‐step recipe for high‐quality, low energy surfaces

Cited by 109 publications

References 66 publications

Antimicrobial performance of mesoporous titania thin films: role of pore size, hydrophobicity, and antibiotic release

Antimicrobial performance of mesoporous titania thin films: role of pore size, hydrophobicity, and antibiotic release

Nucleated dewetting in supported ultra-thin liquid films with hydrodynamic slip

Integrated Strategy toward Self-Powering and Selectivity Tuning of Semiconductor Gas Sensors

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