A5055120115- Molecular Junctions and Nanostructures
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Polymer Surface Interaction Studies
- Advanced biosensing and bioanalysis techniques
- Click Chemistry and Applications
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Analytical Chemistry and Chromatography
- Silicon Nanostructures and Photoluminescence
- Quantum Dots Synthesis And Properties
- Luminescence and Fluorescent Materials
- Semiconductor materials and interfaces
- Glycosylation and Glycoproteins Research
- Nanofabrication and Lithography Techniques
- Analytical Chemistry and Sensors
- Monoclonal and Polyclonal Antibodies Research
- Advanced Chemical Physics Studies
- Photochemistry and Electron Transfer Studies
- Supramolecular Chemistry and Complexes
- Marine Biology and Environmental Chemistry
- Fluorine in Organic Chemistry
- Carbohydrate Chemistry and Synthesis
- Chemical Synthesis and Analysis
- Surface Modification and Superhydrophobicity
Wageningen University & Research
2016-2025
Tianjin University
2016-2025
Jiaxing University
2023-2025
Hunan Normal University
2020-2025
King Abdulaziz University
2014-2023
Karlsruhe Institute of Technology
2019
Tianjin University of Science and Technology
2016
Institut des Sciences Chimiques de Rennes
2013
Centre National de la Recherche Scientifique
2013
Université de Rennes
2013
The modification of surfaces by the deposition a robust overlayer provides an excellent handle with which to tune properties bulk substrate those interest. Such control over surface becomes increasingly important continuing efforts at down-sizing active components in optoelectronic devices, and corresponding increase area/volume ratio. Relevant include degree is wetted water or oil. Analogously, for biosensing applications there increasing interest so-called "romantic surfaces": that repel...
The phase behavior of three N-alkyl-substituted perylene diimide derivatives is examined by differential scanning calorimetry and polarized optical microscopy. occurrence multiple transitions indicates several crystalline liquid phases. X-ray diffraction measurements show that the phases display high structural ordering in all dimensions: smectic layers are formed, within these an additional columns observed. Molecular modeling confirms this result substantiates with interdigitating alkyl...
Monolayers that are bonded via a covalent Si−C bond prepared on silicon(100) surface by reaction of 1-alkene with the hydrogen-terminated silicon surface. The monolayers have been analyzed infrared spectroscopy, X-ray reflectivity, and water contact angle measurements display remarkably high thermal stability. also works well for ω-functionalized 1-alkenes, provided functional group is properly protected. After formation monolayer, protecting can be easily removed without noticeable...
Colloidal semiconductor quantum dots (QDs) constitute a perfect material for ink-jet printable large area displays, photovoltaics, light-emitting diode, bio-imaging luminescent markers and many other applications. For this purpose, efficient light emission/absorption spectral tunability are necessary conditions. These currently fulfilled by the direct bandgap materials. Si-QDs could offer solution to major hurdles posed these materials, namely, toxicity (e.g., Cd-, Pb- or As-based QDs),...
Abstract Background Surface charge and oxidative stress are often hypothesized to be important factors in cytotoxicity of nanoparticles. However, the role these is not well understood. Hence, aim this study was systematically investigate surface charge, possible involvement mitochondria production intracellular reactive oxygen species (ROS) upon exposure rat macrophage NR8383 cells silicon For highly monodisperse (size 1.6 ± 0.2 nm) well-characterized Si core nanoparticles (Si NP) were used...
Tiara[5]arenes (T[5]s), a new class of five-fold symmetric oligophenolic macrocycles that are not accessible from the addition formaldehyde to phenol, were synthesized for first time. These pillar[5]arene-derived structures display both unique conformational freedom, differing pillararenes, with rich blend solid-state conformations and excellent host-guest interactions in solution. Finally we show how this novel macrocyclic scaffold can be functionalized variety ways used as functional...
Abstract Self‐healing antifouling materials have gained rapidly increasing interest over the past decade and been studied used in a range of applications. Recent developments challenges self‐healing are summarized four sections: first, different mechanisms for both briefly discussed. Second, three main categories based on surface replenishing dynamic covalent noncovalent interactions discussed, with focus preparation, characterization, central characteristics materials. Third, types...
Covalent attachment of functionalized monolayers onto silicon surfaces (see Figure for examples) is presented here as a strategy surface modification. The preparation and structure both unfunctionalized alkyl-based are described, potential applications, example, in the passivation Si solar cells photopatterning surfaces.
A very mild method was developed for the attachment of high-quality organic monolayers on crystalline silicon surfaces. By using visible light sources, from 447 to 658 nm, a variety 1-alkenes and 1-alkynes were attached hydrogen-terminated Si(100) Si(111) surfaces at room temperature. The presence quality evaluated by static water contact angles, X-ray photoelectron spectroscopy, IR spectroscopy. Monolayers prepared thermal, UV light, or initiation compared. Additionally, ability infrared...
The possibility to use dilute alkene solutions for the formation of monolayers with 1-hexadecene on a hydrogen-terminated silicon(100) surface has been investigated variety solvents. resulting were analyzed by water contact angles. Anisole, n-butylbenzene, and n-decane found be unsuitable solvents monolayer preparation at all concentrations used. At high (25% 10% (v/v)) well-ordered formed in toluene, xylene (mixture isomers), cumene, tert-butylbenzene, mesitylene. Only mesitylene are...
Highly monodisperse silicon nanoparticles (1.57 +/- 0.21 nm) are synthesized with a covalently attached alkyl monolayer on gram scale. Infrared spectroscopy shows that these contain only few oxygen atoms per nanoparticle. XPS spectra clearly show the presence of unoxidized Si and chains. Owing to relatively efficient synthesis (yields approximately 100-fold higher than those previously reported) molar extinction coefficient epsilon can be measured: epsilon(max) = 1.7 x 10(-4) M(-1)cm(-1),...
Superhydrophobic and superamphiphobic toward superoleophobic polymeric surfaces of polymethyl methacrylate (PMMA), polyether ether ketone (PEEK), polydimethyl siloxane (PDMS) are fabricated in a two-step process: (1) plasma texturing (i.e., ion-enhanced etching with simultaneous roughening), varying chemistry depending on the polymer, subsequently (2) grafting self-assembled perfluorododecyltrichlorosilane monolayers (SAMs). Depending absence or not an etch mask colloidal microparticle...
Although it is frequently hypothesized that surface (like charge) and physical characteristics particle size) play important roles in cellular interactions of nanoparticles (NPs), a systematic study probing this issue missing. Hence, comparative cytotoxicity study, quantifying nine different endpoints, was performed with broad series monodisperse, well characterized silicon (Si) germanium (Ge) NPs various functionalizations. Human colonic adenocarcinoma Caco-2 rat alveolar macrophage NR8383...
Very stable and bright emitting amine-terminated Si nanoparticles (NPs) with different alkyl chain lengths between the core amine end-group are synthesized. The obtained NPs have a spherical shape homogeneous size distribution (1.57 ± 0.24 nm). Their emission can be tuned from UV to blue spectral region, in controllable fashion, by only changing spacer length. quantum yields ∼12% for all synthesized NPs. Excited state lifetimes ns range point direct band gap excitation. NH2-terminated...
Zwitterionic poly(sulfobetaine acrylamide) (SBMAA) brushes were grafted from silicon-rich silicon nitride (SixN4, x > 3) surfaces by atom transfer radical polymerization (ATRP) and studied in protein adsorption experiments. To this aim ATRP initiators immobilized onto SixN4 through stable Si−C linkages via three consecutive reactions. A UV-induced reaction of 1,2-epoxy-9-decene with hydrogen-terminated was followed conversion the epoxide 1,2-ethylenediamine resulting primary secondary...
Several simple methods are presented and evaluated to simulate the X-ray photoelectron spectra (XPS) of organic monolayers polymeric layers by density functional theory (DFT) second-order Møller–Plesset (MP2) in combination with a series basis sets. The simulated carbon (C1s) XPS as obtained via B3LYP/6-311G(d,p) or M11/6-311G(d,p) calculations good agreement (average mean error <0.3 eV) experimental spectra, estimates C1s can be EC1s(exp) = 0.9698EC1s(theory) + 20.34 (in...
On H−Si(111), monolayer assembly with 1-alkenes results in alkyl monolayers a Si−C−C linkage to the silicon substrate, while 1-alkynes yield alkenyl Si−C═C linkage. To investigate influence of different groups on final structure, organic were prepared from and chain lengths C12 C18, structures studied detail by static water contact angles measurements, ellipsometry, attenuated total reflectance infrared (ATR-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS). The thicknesses, tilt...