A5057016485- Quantum Dots Synthesis And Properties
- Nanomaterials and Printing Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- X-ray Diffraction in Crystallography
- Molecular Junctions and Nanostructures
- Carbon Nanotubes in Composites
- Crystallization and Solubility Studies
- Photonic Crystals and Applications
- Nanofabrication and Lithography Techniques
- Conducting polymers and applications
- Innovative Microfluidic and Catalytic Techniques Innovation
- Porphyrin and Phthalocyanine Chemistry
- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Additive Manufacturing and 3D Printing Technologies
- Advanced biosensing and bioanalysis techniques
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Pickering emulsions and particle stabilization
- Nanotechnology research and applications
- Supramolecular Self-Assembly in Materials
- Electrowetting and Microfluidic Technologies
- Synthesis and Properties of Aromatic Compounds
- Luminescence and Fluorescent Materials
Chemnitz University of Technology
2015-2025
Fraunhofer Institute for Electronic Nano Systems
2019-2025
Linköping University
2011-2015
B.I. Stepanov Institute of Physics
2012
University of Zurich
2012
Belarusian National Technical University
2012
Leipzig University
2012
The review discusses the latest advances in directed synthesis and application of macroheterocyclic compounds science, engineering technology, viz.as catalysts for various processes photo-and electrocatalysis, optical chemosensors metal cations, selective receptors organic compounds, inductors selectors, nonlinear optics, electronics, as magnets, photosensitizers PDT a number oncological diseases antimicrobial PDT, etc.
The chemical and physical properties of [AgO2C(CH2OCH2)3H] (3) its use as an aqueous, ligand-free MOD ink (MOD = metal−organic decomposition) for piezo inkjet printing is discussed. printed, thermal, or photochemical sintered silver features are electrically conductive on glass (2.7 × 107 S m−1) PET (PET polyethylene terephthalate) substrates (1.1 corresponding to 43% 18% the bulk conductivity. Conducted tape tests show suitability particularly polymer substrates. TG-MS studies demonstrate a...
We report on the modification of thermoelectric properties poly(3,4-ethylenedioxylthiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films by means a simple post treatment solid realized drop-coating. show that organic polar solvents, dimethyl sulfoxide and ethylene glycol as secondary dopants for PEDOT:PSS, only affect film morphology which high electrical conductivity is observed. In contrast, ethanolamine (MEA) ammonia solutions are reduction agents improve density PEDOT chains in reduced...
The formation of nanoassemblies CdSe/ZnS quantum dots (QD) and pyridyl-substituted free-base porphyrin (H(2)P) molecules has been spectroscopically identified by static time-resolved techniques. engineered controlling the type geometry H(2)P molecules. Pyridyl functionalization gives rise to a strong complex accompanied QD photoluminescence (PL) quenching. For some systems, this quenching is partly related fluorescence resonance energy transfer (FRET) from can be explained according Förster...
Steady-state photoluminescence (PL) quenching of colloidal CdSe/ZnS and CdSe quantum dots (QDs) induced by functionalized porphyrin molecules was investigated for various QD sizes. The majority the observed strong can be assigned to neither Förster resonant energy transfer (FRET) nor photoinduced charge between QDs chromophore. Using remaining small FRET efficiency monitor formation QD/chromophore nanoassemblies, major contribution PL found proportional calculated quantum-confined exciton...
We report on the results of a detailed quantitative experimental evaluation exciton relaxation pathways as well direct measurement singlet oxygen (1O2) generation efficiencies for CdSe/ZnS quantum dot (QD)– porphyrin nanocomposites in toluene at 295 K. QD photoluminescence quenching is caused by two main factors: electron tunneling confined (efficiency 0.85–0.90) and Förster resonance energy transfer (FRET) QD→porphyrin (quenching efficiency 0.10–0.15). Efficiencies 1O2 γΔ are essentially...
The manufacturing of three-dimensional colloidal structures on solid substrates is an important topic applied research, aiming for photonic components especially in photovoltaic and sensor applications. Whereas conventional techniques such as wet self-assembly are based engineering the substrate surface energy, alternative strategies envisage independence interfacial conditions. We report inkjet printing suspensions monodisperse silica or polystyrene nanoparticles both their to spherical...
We report on inkjet printing of aqueous colloidal suspensions containing monodisperse silica and/or polystyrene nanosphere particles and a systematic study the morphology deposits as function different parameters during solvent evaporation. The act model ink for an understanding layer formation processes resulting morphologies in general. investigated influence surface energy temperature substrate, formulation suspensions, multi-pass aiming stacks deposits. explain our findings with models...
Functional dye molecules, such as porphyrins, attached to CdSe quantum dots (QDs) through anchoring meso-pyridyl substituents, form quasi-stable nanoassemblies. This fact results in photoluminescence (PL) quenching of the QDs both due Förster resonance energy transfer (FRET) and formation non-radiative surface states under conditions confinement (non-FRET). The process is competition with ligand dynamics. At least two timescales are found for assemblies: 1) one faster than 60 s attributed...
In this study, a method for depositing and patterning the thermosensitive polymer poly(N-isopropylacrylamide) on SiO2 surfaces is presented potential use in nano-sized microfluidic channels. Two approaches based nanolithographic processes are shown purpose. both cases, self-assembling monolayer consisting of (3-aminopropyl)-dimethylethoxysilane was bound to hydroxyl group substrate surface subsequently functionalized with polymerization initiator α-bromoisobutyryl bromide. first approach...
Abstract A hybrid manufacturing approach for organic electrochemical transistors (OECTs) on flexible substrates is reported. The technology based conventional and digital printing (screen inkjet printing), laser processing, post‐press technologies. careful selection of the conductive, dielectric, semiconductor materials with respect to their optical properties enables a self‐aligning pattern formation which results in significant reduction usual registration problems during manufacturing....
We present a case study about inkjet printing as tool for molecular patterning of silicon oxide surfaces with hydrophobic functionality, mediated by n-octadecyltrichlorosilane (OTS) molecules. In contrast to state-of-the-art techniques such micro contact or chemical immersion subsequent lithography processes, piezo drop-on-demand does not depend on physical masters, which allows an effective direct-write rigid flexible substrates and enables short run-lengths the individual pattern. this...
Nanoassemblies formed via self-assembly based on colloidal CdSe quantum dots (QDs) and porphyrin (H2P) dye molecules show Fluorescence Resonant Energy Transfer (FRET) non-FRET quenching of QD photoluminescence (PL). We present a procedure to unravel quantify these two relaxation pathways dynamic static PL experiments. Accordingly, FRET amounts at maximum 10% the total efficiency. Since degree ligand coverage is inhomogeneously distributed across ensemble yields vary broadly. The attachment...
ABSTRACT FluidFM deposition, also known as pressure‐controlled and force‐controlled micropipetting, of nanomaterials suspended in fluidic carrier liquids is a capillary‐driven, high‐precision liquid‐in‐liquid deposition manipulation technique biofluidic environments. In this work, we report on its usage liquid‐on‐solid structuring from an aqueous dispersion colloidal inorganic semiconductor Ag–In–S quantum dots (QDs) stabilized with glutathione ligands solid substrates. We show the recurrent...
We present a two-dimensional phononic crystal structure that exhibits exceptionally large complete band gaps, akin to those typically associated with bubble crystals. Our analysis begins numerical simulations of characterized by material parameters are continuous functions spatial coordinates, arriving at sawtooth parameter function, whose can be replicated surprisingly simple configuration inclusions touching single point, effectively functioning as broadband filter. This allows us perform...
We report large exciton energy tuning (∼62 meV) in WSe 2 monolayers via substrate induced non-degenerate electron doping.
The authors propose an on‐chip microfluidic flow chemistry for non‐covalent functionalization of single‐walled carbon nanotubes (SWCNTs) as channel material in nanoelectronic carbon‐nanotube field‐effect transistors (CNT‐FETs) specifically aiming personalized optoplasmonic sensor solutions. Applying pyrene alkanethiol derivatives, dissolved chloroform, and a dispersion gold nanoparticles triglyme, the conduct proof‐of‐principle to fabricate arrays photosensitive CNT‐FETs using on...
Abstract The synthesis of 1‐Fc‐ ( 3 ), 1‐Br‐6‐Fc‐ 5 a 2‐Br‐7‐Fc‐ 7 1,6‐Fc 2 ‐ b 2,7‐Fc ‐pyrene 3,6‐Fc ‐9,10‐phenanthrenedione 10 and ‐9,10‐dimethoxyphenanthrene 12 ; Fc=Fe(η ‐C H 4 )(η )) is discussed. Of these compounds, form 1D or 2D coordination polymers in the solid state. (Spectro)Electrochemical studies confirmed reversible Fc/Fc + redox events between −130 160 mV. 1,6‐ 2,7‐Substitution E °′=−130 mV) °′=50 influences potentials, whereas ones °′=20 are independent. Compounds , show...
We review recent experimental work to utilize the size dependence of luminescence quenching colloidal semiconductor quantum dots induced by functionalized porphyrin molecules attached surface describe a photoluminescence (PL) process which is different from usual models charge transfer (CT) or Foerster resonant energy (FRET). Steady-state and picosecond time-resolved measurements were carried out for nanocomposites based on CdSe/ZnS CdSe (QDs) various sizes surfacely...