A5051308850- Molecular Junctions and Nanostructures
- Quantum Dots Synthesis And Properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Chemistry and Chemical Engineering
- Advanced biosensing and bioanalysis techniques
- Surface Chemistry and Catalysis
- Nanofabrication and Lithography Techniques
- Force Microscopy Techniques and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Polymer Surface Interaction Studies
- Graphene research and applications
- Organic Electronics and Photovoltaics
- Electrochemical Analysis and Applications
- Chemical Reactions and Mechanisms
- Nanocluster Synthesis and Applications
- Chemical Synthesis and Analysis
- Photoreceptor and optogenetics research
- Machine Learning in Materials Science
- 2D Materials and Applications
- Sulfur-Based Synthesis Techniques
- Mass Spectrometry Techniques and Applications
- Photochromic and Fluorescence Chemistry
- Luminescence and Fluorescent Materials
- Advanced Chemical Physics Studies
Goethe University Frankfurt
2016-2025
Nankai University
2019-2021
Goethe Institute
2019
Kiel University
2014
Universität Hamburg
1999-2013
Philipps University of Marburg
2007-2010
Heidelberg University
2004-2010
Technical University of Munich
2007-2010
Ruhr University Bochum
1998-2008
Jagiellonian University
2008
Regular arrays of topologically complex, millimeter-scale objects were prepared by self-assembly, with the shapes assembling and wettability their surfaces determining structure arrays. The system was composed solid floating at interface between perfluorodecalin water interacting lateral capillary forces; patterning directs these forces. Self-assembly results from minimization interfacial free energy liquid-liquid interface. Calculations suggest that this strategy for self-assembly can be...
This paper describes an experimentally simple system for measuring rates of electron transport across organic thin films having a range molecular structures. The uses metal−insulator−metal junction based on self-assembled monolayers (SAMs); it is particularly easy to assemble. consists SAM supported silver film (Ag-SAM(1)) in contact with second the surface drop mercury (Hg-SAM(2))that is, Ag-SAM(1)SAM(2)-Hg junction. SAM(1) and SAM(2) can be derived from same or different thiols. current...
Abstract Whereas the preparation of defined metal–organic framework (MOF) materials via hydrothermal or diffusion methods typically requires hours to days, our simple precipitation route opens access well‐known HKUST‐1 frameworks within minutes. Crucial for formation a well‐defined, crystalline material is choice suitable precipitating solvents, with methanol and ethanol being most favorable ones. This approach could be extended dense, surface‐mounted MOF films (so‐called SURMOFs), in...
We use electrostatic interactions to direct the patterning of gold disks having ∼10-μm diameters on functionalized surfaces. Planar and curved substrates with patterned surface charge were generated either by microcontact printing or photolithography. Small charged electroplating into photoresist molds derivatizing these self-assembled monolayers. When agitated as a suspension in contact surfaces, deposited specifically but disordered aggregates regions presenting opposite charge....
Self-assembled monolayers (SAMs) formed from thiophenol, 1,1'-biphenyl-4-thiol, 1,1';4',1' '-terphenyl-4-thiol, and anthracene-2-thiol on polycrystalline Au Ag were characterized by X-ray photoelectron spectroscopy angle-resolved near-edge absorption fine structure spectroscopy. With the exception of poorly defined thiophenol film Au, all thioaromatic molecules found to form highly oriented densely packed SAMs both substrates. The molecular orientation orientational order adsorbed depends...
COOH-terminated organic surfaces were prepared by self-assembly of different organothiols, mercaptohexadecanoic acid (MHDA) and mercaptomethylterphenylcarboxylic (MMTA), on Au substrates. The SAMs explored infrared reflection−absorption spectroscopy X-ray photoelectron spectroscopy. A rather strong dependence preparation conditions is observed which explains inconsistencies between previous studies reported for these systems. Using optimized conditions, films with a high degree molecular...
Indications for exponential autocatalysis in a small self-replicating chemical system are found the first time synthesis of 3 from 1 and 2. In other words, higher concentration initial reaction mixture, faster its formation. The anils self-complementary accelerate their own by factor 16 M−1/2 to 370 M−1. R1 = Me, tBu; R2 H, NO2.
Flexible in many aspects: inkjet printing of metal-organic frameworks permits their larger area, high-resolution deposition any desired pattern, even the form gradients or shades. When flexible substrates are used, applications can be envisioned, such as sensing and capture hazardous gases for personal safety measures. As a service to our authors readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may re-organized online delivery, but not...
The progressive liquid-phase layer-by-layer (LbL) growth of anisotropic multicomponent layer-based porous coordination polymers (PCPs) the general formula [M(L)(P)(0.5)] (M: Cu(2+), Zn(2+); L: dicarboxylate linker; P: dinitrogen pillar ligand) was investigated by using either pyridyl- or carboxyl-terminated self-assembled monolayers (SAMs) on gold substrates as templates. It found that deposition smooth, highly crystalline, and oriented multilayer films these PCPs depends conditions at early...
Free-standing nanomembranes with molecular or atomic thickness are currently explored for separation technologies, electronics, and sensing. Their engineering well-defined structural functional properties is a challenge materials research. Here we present broadly applicable scheme to create mechanically stable carbon (CNMs) of ∼0.5 ∼3 nm. Monolayers polyaromatic molecules (oligophenyls, hexaphenylbenzene, polycyclic aromatic hydrocarbons) were assembled exposed electrons that cross-link them...
The layer-by-layer growth of a surface-attached metal-organic framework (SURMOF), [Cu2(F4bdc)2(dabco)] (F4bdc = tetrafluorobenzene-1,4-dicarboxylate and dabco 1,4-diazabicyclo-[2.2.2]octane), on carboxylate- pyridine-terminated surfaces has been investigated by various surface characterization techniques. Particular attention was paid to the dependency crystal orientation morphology functionality, deposition temperature, first layer order. For fully oriented SURMOFs, not only suitable...
Using a representative model system, here electronic and structural properties of aromatic self‐assembled monolayers (SAMs) are described that contain an embedded, dipolar group. As polar unit, pyrimidine is used, with its orientation in the molecular backbone and, consequently, direction embedded dipole moment being varied. The these embedded‐dipole SAMs thoroughly analyzed using number complementary characterization techniques combined quantum‐mechanical modeling. It shown such...
Abstract Based on the powerful concept of embedded dipole self‐assembled monolayers (SAMs), highly conductive interfacial layers are designed, which allow tuning contact resistance organic thin‐film transistors over three orders magnitude with minimum values well below 1 kΩ cm. This not only permits realization competitive p‐type (pentacene‐based) devices rigid as flexible substrates, but also enables n‐type (C 60 ‐based) comparable characteristics utilizing same electrode material (Au). As...
Understanding the impact of surface copper valence states on distribution electrochemical carbon dioxide products is critical. Herein, CuO@Cu2O with a Cu2+/Cu+ interface was fabricated using wet chemical etching approach. The hollow shape offered large region for gas adsorption, while interfacial mixed state tunable control ratio raised local density CHO* and accelerated carbon-carbon coupling reaction. H-cell test results demonstrate that, as result this precise structural design, Faraday...
The formation and molecular structure of self-assembled monolayers (SAMs) anthracene-2-thiol (AnT) on Au(111) have been characterized by reflection adsorption infrared spectroscopy, thermal desorption X-ray photoelectron near-edge absorption scanning tunneling microscopy, low energy electron diffraction. It is demonstrated that highly ordered monolayer films are formed upon immersion, but their quality depends critically the choice solvents rinsing conditions. saturated a closed packed...
Self-assembled monolayers (SAMs) were prepared from different oligophenylthiol molecules (terphenylthiol, (C6H5C6H4C6H4SH, TPT), terphenylmethanethiol (C6H5C6H4C6H4CH2SH, TPMT), and carboxy (HOOCC6H4C6H4C6H4CH2SH, CTPMT)) on Au substrates. Compared to the more commonly used alkanethiols this class of organothiols has a much rigid backbone. It is demonstrated that for with strongly interacting function at ω-position larger mechanical rigidity significantly affects molecular structure...
This paper demonstrates a new method for the synthesis of mixed self-assembled monolayers (mixed SAMs) by reaction reactive intermediatean interchain carboxylic anhydridewith alkylamines. The anhydride was prepared in high yield from SAM 16-mercaptohexadecanoic acid (HS(CH2)15COOH) on gold treatment with trifluoroacetic anhydride. Alkylamines reacted cleanly to generate SAM, which comprised mixture acids and amides approximately 1:1 ratio surface. SAMs were characterized using polarized...
The structure and orientation within prototype self-assembled monolayers (SAMs) containing aromatic subunits absorbed on Au substrates has been investigated using infrared (IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM). Several oligophenyl(di)thiols, namely biphenylthiol (HS−C6H4−C6H5, BPT), biphenyldithiol (HS−C6H4−C6H4−SH, BPDT), biphenyldimethyldithiol (HS−CH2−C6H4−C6H4−CH2−SH, BPDMT), terphenyldimethyldithiol (HS−CH2−C6H4−C6H4−C6H4−CH2−SH,...
In this paper we present a modular approach for the fabrication of surfaces to characterize protein-protein interactions. The is based on azido peptides with an optimized sequence which are then thiol-functionalized using alkynyl thiol and "click" chemistry. From these peptide thiols fabricated SAMs gold evaluate protein resistance, surface plasmon resonance spectroscopy, toward streptavidin, bovin serum albumin (BSA), fibronectin.
A flexible approach for the fabrication of chemical gradients on different substrates is presented. The key idea tuning exchange reaction between a self-assembled monolayer covering substrate and potential molecular substituent by electron irradiation. figure shows water drops hydrophilicity gradient created using this method.
Using a nitrile tailgroup as spectroscopic marker, both twist and tilt of the aromatic backbones in several typical SAMs on Au(111) have been directly determined single experiment. Whereas exact value angle depends molecular architecture, it was found to be quite noticeable all (40−50°) close respective for bulk systems (32°).