A5024177270- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Electron Spin Resonance Studies
- Metal-Catalyzed Oxygenation Mechanisms
- Metal complexes synthesis and properties
- Quantum Dots Synthesis And Properties
- Molecular Junctions and Nanostructures
- 2D Materials and Applications
- Magnetic properties of thin films
- Chalcogenide Semiconductor Thin Films
- Diamond and Carbon-based Materials Research
- Neural Networks and Reservoir Computing
- Conducting polymers and applications
- Advanced Fiber Optic Sensors
- Nanoparticle-Based Drug Delivery
- Perovskite Materials and Applications
- Electromagnetic wave absorption materials
- Energy and Environmental Systems
- Thin-Film Transistor Technologies
- Building Energy and Comfort Optimization
- Porphyrin and Phthalocyanine Chemistry
- Graphene research and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum and electron transport phenomena
- Analytical Chemistry and Sensors
Leibniz University Hannover
2022-2024
Institute of Inorganic Chemistry of the Slovak Academy of Sciences
2024
Czech Academy of Sciences, Institute of Inorganic Chemistry
2024
United States Department of Agriculture
2019
Agricultural Research Service
2019
Abstract With the advent of first laser sources and suitable detectors, optical sensor applications immediately also came into focus. During last decades, a huge variety concepts were developed, yet forecast for future application potential appears even larger. In this context, development new probes at different scales down to atomic or molecular level open avenues research development. We investigated an iron based triazole spin-crossover complex changing its absorption characteristics...
2D semiconducting transition metal dichalcogenides (TMDCs) are highly promising materials for future spin- and valleytronic applications exhibit an ultrafast response to external (optical) stimuli which is essential optoelectronics. Colloidal nanochemistry on the other hand emerging alternative synthesis of TMDC nanosheet (NS) ensembles, allowing control reaction via tunable precursor ligand chemistry. Up now, wet-chemical colloidal syntheses yielded intertwined/agglomerated NSs with a large...
We synthesized iron(II)-triazole spin crossover compounds of the type [Fe(atrz)3]X2 and incorporated deposited them on electrospun polymer nanofibers. For this, we used two separate electrospinning methods with goal obtaining complex composites intact switching properties. In view possible applications, chose iron(II)-triazole-complexes that are known to exhibit close ambient temperature. Therefore, complexes [Fe(atrz)3]Cl2 [Fe(atrz)3](2ns)2 (2ns = 2Naphthalenesulfonate) those fibers...
The bistability of multiple physical properties driven by external stimuli in a solid is desired prerequisite for its application memory devices with convenient data readout. We present pathway thermal detectable four properties: magnetic, light absorption, second-harmonic generation (SHG), and dielectric. report novel heterometallic (TBA){[FeII(phIN)4][ReV(CN)8]}·(phIN) (1) (TBA = tetrabutylammonium cation, phIN phenyl isonicotinate) cyanido-bridged chain material. Owing to an appropriate...
Abstract The development of molecular switches with tunable properties has garnered considerable interest over several decades. A novel spin‐crossover ( SCO ) material based on iron(II) complexes incorporating 4‐acetylpyridine (4‐acpy) and [Hg(SCN) 4 ] 2− anions was synthesized formulated as [Fe(4‐acpy) 2 ][Hg( μ ‐SCN) 1 ). Compound is crystallized in a three‐dimensional network the non‐centrosymmetric orthorhombic space group Pna two octahedral (NCS) entities featuring distinct Fe centers...
Abstract With the advent of first laser sources and suitable detectors, optical sensor applications immediately also came into focus. During last decades, a huge variety optial concepts were developed, yet forecast for future application potential appears even larger. In this context, development new probes at different scales down to atomic or molecular level open avenues research development. We investigated an iron based triazole spin-crossover complex changing its absorption...
Coordination compounds, like iron(II) triazole complexes, exhibit spin crossover (SCO) behavior at around room temperature. Therefore, they are interesting for a variety of possible applications, and it is convenient to integrate them into polymers. Due reduction the iron content thus also 57Fe in sample through integration polymers, Mössbauer measurements only with greater difficulty or very long measurement times without expensive enrichment samples 57Fe. So, other ways improving signal...
AC susceptibility measurements of [Fe
Abstract In this work polymer nanofibers were functionalized by incorporation of the spin transition (ST) compound [Fe(H 2 btm) (H O) ]Cl (FeH2btm) (H2btm=di(1H‐tetrazol‐5‐yl)methane). FeH2btm is an interesting due to its ability reversibly and sensitively switch between high (HS) low (LS) state when exposed common volatile compounds (VOC) like ammonia methanol. By using polyvinylidene fluoride (PVDF) as main compound, inhibiting interactions complex minimized. UV‐Vis spectroscopy, visible...
The bistability of multiple physical properties driven by external stimuli in a solid is desired prerequisite for its application memory devices with convenient data readout. We present pathway thermal detectable four properties: magnetic, light absorption, second‐harmonic generation (SHG), and dielectric. report novel heterometallic (TBA){[FeII(phIN)4][ReV(CN)8]}·(phIN) (1) (TBA = tetrabutylammonium cation, phIN phenyl isonicotinate) cyanido‐bridged chain material. Owing to an appropriate...
Abstract The development of molecular switches with tunable properties has garnered considerable interest over several decades. A novel spin‐crossover ( SCO ) material based on iron(II) complexes incorporating 4‐acetylpyridine (4‐acpy) and [Hg(SCN) 4 ] 2− anions was synthesized formulated as [Fe(4‐acpy) 2 ][Hg( μ ‐SCN) 1 ). Compound is crystallized in a three‐dimensional network the non‐centrosymmetric orthorhombic space group Pna two octahedral (NCS) entities featuring distinct Fe centers...
In this paper we study a series of solid iron(II)‐triazole spin crossover complexes the formula [Fe(NH2trz)3]Br2(x‐1)Cl2x, where counterions bromide and chloride are present in same structure different ratios. Thus, transition temperature also changes range between pure [Fe(NH2trz)3]Br2 [Fe(NH2trz)3]Cl2. Since these switching temperatures rather far apart, allows us to examine how SCO behavior iron(II) triazole with mixed To achieve this, were synthesized both simultaneously using salts...
Abstract Since their discovery, cadmium chalcogenide nanoplatelets (NPLs) gained a lot of interest, not only due to beneficial characteristic, but also because high affinity self‐assemble into ordered stacks. Interestingly, the stacks showed both properties single NPLs and new collective features, such as charge carrier transport within Until now, stacking was, best knowledge, performed in non‐polar media mostly through addition antisolvents with higher polarity. Due fact, that many...
For many applications of magnetic nanoparticles, the material must be dispersed in water. Therefore, this study used a two-phase system to transfer iron oxide (γ-Fe2O3 and Fe3O4) platinum (FePt) nanoparticles aqueous solution, using low molecular weight catechol derivate (nitroDOPA). The monodisperse were synthesized spherical cubic shapes through high boiling point heat-up synthesis approaches followed by phase step. colloidal nanoparticle solutions investigated infrared spectroscopy, X-ray...
We synthesized iron(II)-triazole spin crossover compounds of the type [Fe(atrz)3]X2 and incorporated deposited them on electrospun polymer nanofibers. In view possible applications, we chose iron(II)-triazole-complexes that are known to exhibit close ambient temperature. Therefore used complexes [Fe(atrz)3]Cl2 [Fe(atrz)3](2ns)2 (2ns = 2Naphthalenesulfonate) analyzed with IR-, UV/Vis Mossbauer spectroscopy a SQUID magnetometer. The were then in one attempt fibers polymethylmethacrylate (PMMA)...
Thermal management in printed circuit boards is becoming increasingly more important as the use of LEDs now widespread across all industries. Due to availability preferred electronic LED current drivers and system constraints for a machine-vision application, design dictated need double-sided metal core board (MCPCB). However, information this relatively new MCPCB offering sparse non-existent. To fill-in missing literature, experiments were conducted where arranged on (MCPCB), their impact...
The miniaturization and integration of various optical sensors was increasingly investigated during the last decades [1]. An important part creating integrated elements is development or combination new materials manufacturing techniques.
2D semiconducting transition metal dichalcogenides (TMDCs) are highly promising materials for future spin- and valleytronic applications exhibit an ultrafast response to external (optical) stimuli which is essential optoelectronics. Colloidal nanochemistry on the other hand emerging alternative synthesis of TMDC nanosheet (NS) ensembles, allowing control reaction via tunable precursor ligand chemistry. Up now, wet-chemical colloidal syntheses yielded intertwined/agglomerated NSs with a large...
Self-written waveguides (SWWs) are established as interconnection between different optical elements. They enable a rigid and easy-to-manufacture low-loss connection, which can be employed in many configurations. For the writing process, UV-curable monomer is applied two elements need to connected. If UV- or near-UV light through on of (i.e. fiber), starts polymerize increases refractive index locally leading self-trapping beam. Subsequently, surrounding resin cured with UV-flood exposure...