Claus Feldmann

ORCID: 0000-0003-2426-9461
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Research Areas
  • X-ray Diffraction in Crystallography
  • Crystallization and Solubility Studies
  • Luminescence Properties of Advanced Materials
  • Inorganic Chemistry and Materials
  • Quantum Dots Synthesis And Properties
  • Ionic liquids properties and applications
  • Crystallography and molecular interactions
  • Metal-Organic Frameworks: Synthesis and Applications
  • Crystal Structures and Properties
  • Catalytic Processes in Materials Science
  • Nanocluster Synthesis and Applications
  • Gas Sensing Nanomaterials and Sensors
  • Synthesis and characterization of novel inorganic/organometallic compounds
  • Advanced Photocatalysis Techniques
  • Polyoxometalates: Synthesis and Applications
  • Organometallic Complex Synthesis and Catalysis
  • Catalysis and Oxidation Reactions
  • Inorganic Fluorides and Related Compounds
  • ZnO doping and properties
  • Copper-based nanomaterials and applications
  • Lanthanide and Transition Metal Complexes
  • Magnetism in coordination complexes
  • Gold and Silver Nanoparticles Synthesis and Applications
  • Organometallic Compounds Synthesis and Characterization
  • Nanomaterials for catalytic reactions

Karlsruhe Institute of Technology
2016-2025

Royal Society of Chemistry
2023

Zhejiang University
2023

The University of Texas at Austin
2023

Indian Institute of Science Bangalore
2023

University of Twente
2023

The University of Queensland
2023

Harbin Institute of Technology
2023

Uppsala University
2023

University of Birmingham
2023

Abstract Up until approximately 80 years ago, only black‐body radiation (including natural sources) was available to illuminate our environment. To realise state‐of‐the‐art lamps, TV sets, monitors, and medical scanners, took an enormous scientific technical effort. Inorganic luminescent materials are key components, which were, are, will be prerequisite the functionality success of many lighting display systems. In this Highlight, a hundred inorganic material research reviewed.

10.1002/adfm.200301005 article EN Advanced Functional Materials 2003-07-01

Abstract Nanoparticulate functional materials offer manifold perspectives for the increasing miniaturization and complexity of technical developments. Nanoparticles also make a major contribution to utilization that is sparing natural resources. Besides these obvious aspects, however, importance nanoparticles due their fundamentally novel properties functions. These include photonic crystals efficient luminophors, single particles thin films electronic storage media switching elements,...

10.1002/anie.200903053 article EN Angewandte Chemie International Edition 2010-01-27

Largely monodisperse, crystalline nanoscale oxide particles (for example, Cu2 O, TiO2 , Nb2 O5 ) are preparatively accessible with the polyol method. The colloidal suspensions of thus obtained can be employed readily for homogeneous coating various substrates glass plates, Al2 O3 powder).

10.1002/1521-3773(20010119)40:2<359::aid-anie359>3.0.co;2-b article EN Angewandte Chemie International Edition 2001-01-19

Abstract Nanoscale functional materials such as luminescent (ZnS:Ag + , Cl – ; LaPO 4 :Ce 3+ ,Tb Y 2 O 3 :Eu ), color pigments (CoAl Cr ZnCo (Ti 0.85 Ni 0.05 Nb 0.10 )O α‐Fe Cu(Fe,Cr)O TiO transparent conducting oxides (ZnO:In and catalytically active (CeO Mn V 5 ) are prepared with the polyol method. All these yielded crystalline, spherical, almost monodisperse particles, 30–200 nm in size. Characterization is carried out based on scanning electron microscopy (SEM), X‐ray powder diffraction...

10.1002/adfm.200390014 article EN Advanced Functional Materials 2003-02-05

The polyol synthesis of nanoparticles is reviewed, including metals, oxides, main-group elements and recent strategies to expand the method's limits.

10.1039/c5gc00943j article EN Green Chemistry 2015-01-01

10.1016/j.micromeso.2015.03.036 article EN Microporous and Mesoporous Materials 2015-04-18

Ionic liquids are credited with a number of unusual properties. These include low vapor pressure, wide liquid-phase range, weakly coordinating properties, and high thermal/chemical stability. properties certainly great interest for inorganic synthesis the creation novel compounds. On other hand, repertoire preparing compounds has always been broad, ranging from syntheses in solutions melts to solid-state reactions, crystal growth gas phase high-pressure syntheses. What new aspects can ionic...

10.1002/anie.201100904 article EN Angewandte Chemie International Edition 2011-10-11

Illuminating results: A novel microwave-assisted synthesis in ionic liquids produces highly luminescent and dispersible LaPO4:Ce,Tb nanocrystals (see picture: ethanol dispersion of the daylight (A) with UV excitation (B)). This preparation method offers possibility synthesisindependent surface conditioning nanocrystals.

10.1002/anie.200600244 article EN Angewandte Chemie International Edition 2006-07-10

The use of nanoscale SnO2 hollow spheres as a redox-active sensor is investigated. underlying are prepared via microemulsion approach and exhibit an outer diameter about 15−25 nm, highly crystalline shell with thickness 3−5 nm inner cavity 10−20 in diameter. Subsequent to materials characterization based on SEM, STEM, TEM, IR, TG, BET, XRD the applicability as-prepared porous layers operation tested. Accordingly, deposited common substrates show good response CO concentration range 50 300...

10.1021/cm1011235 article EN Chemistry of Materials 2010-07-22

A step towards low-cost thin-film electronics is achieved, based on the microwave-assisted synthesis of In2O3:Sn (ITO) nanoparticles in ionic liquids (see figure). Ink-jet printed layers ITO plastics exhibit a high transmittance and conductivity, without need for performing any conventional thermal post-treatment. Significantly improved with higher conductivities are to be expected from high-quality printing.

10.1002/adma.200602102 article EN Advanced Materials 2007-07-20

A novel pentadecanuclear lanthanide hydroxy cluster [{Ln15(μ3-OH)20(PepCO2)10(DBM)10Cl}Cl4] (Ln = Eu (1), Tb (2)) featuring the first example with peptoids as supporting ligands was prepared and fully characterized. The solid-state structures of 1 2 were established via single-crystal X-ray crystallography. ESI-MS experiments revealed retention core in solution. Although OH groups are present, showed intense red fluorescence 11(1)% absolute quantum yield, whereas emission intensity yield...

10.1021/ja403539t article EN Journal of the American Chemical Society 2013-05-07

The crown-ether coordination compounds ZnX2(18-crown-6), EuX2(18-crown-6) (X: Cl, Br, I), MnI2(18-crown-6), Mn3Cl6(18-crown-6)2, Mn3I6(18-crown-6)2, and Mn2I4(18-crown-6) are obtained by ionic-liquid-based synthesis. Whereas MX2(18-crown-6) (M: Zn, Eu) show conventional structural motives, exhibit unusual single MnX4 tetrahedra coordinated to the complex. Surprisingly, some outstanding photoluminescence. Thus, rare Zn2+-based luminescence is observed unexpectedly efficient for...

10.1021/jacs.0c09454 article EN cc-by-nc-nd Journal of the American Chemical Society 2021-01-06

Pigment particles on the nanoscale, required for applications such as transparent thin films, inks, and coatings, can be prepared by polyol process. The fabrication of nanoscale major commercial pigments, e.g., CoAl2O4 (blue), Cr2O3 (dark green), α-Fe2O3 (red) (see Figure), is complicated fact that their body color strongly related to degree crystallinity. method yields crystalline colloidally stable pigments.

10.1002/1521-4095(200109)13:17<1301::aid-adma1301>3.0.co;2-6 article EN Advanced Materials 2001-09-01

AlO(OH) hollow spheres are realized via a water-in-oil (w/o) microemulsion, applying the liquid-to-liquid-phase boundary of micellar system as template. Scanning electron microscopy, transmission microscopy (TEM), and dynamic light scattering analyses show presence nonagglomerated exhibiting an outer diameter about 30 nm wall thickness 5-6 nm. High-resolution TEM images highly ordered lattice fringes, indicating crystallinity sphere identifying to consist gamma-AlO(OH) (boehmite). The...

10.1021/nl072074f article EN Nano Letters 2007-10-24

The series of anhydrous lanthanide chlorides LnCl3, Ln = Pr–Tb, and 4,4′-bipyridine (bipy) constitute isotypic MOFs the formula 2∞[Ln2Cl6(bipy)3]·2bipy. europium terbium containing compounds both exhibit luminescence referring trivalent ions, giving a red for Eu3+ green Tb3+ triggered by an efficient antenna effect linkers. Mixing different lanthanides in one MOF structure was undertaken to investigate potential this system colour tuning luminescence. Based on gadolinium compound, co-doping...

10.1039/c2jm15571k article EN Journal of Materials Chemistry 2012-01-01

The divalent lanthanide borohydrides [Ln(BH4)2(THF)2] (Ln = Eu, Yb) have been prepared in a straightforward approach. europium compound shows blue luminescence the solid state, having quantum yield of 75%. Nonradiative deactivation C–H and B–H oscillator groups could be excluded perdeuterated complex [Eu(BD4)2(d8-THF)2], which showed 93%. monocationic species [Ln(BH4)(THF)5][BPh4] bis(phosphinimino)methanides [{(Me3SiNPPh2)2CH}Ln(BH4)(THF)2] from [Ln(BH4)2(THF)2]. They show significantly...

10.1021/ja308077t article EN Journal of the American Chemical Society 2012-10-04

Abstract Nanopartikuläre Funktionsmaterialien bieten vielfältige Perspektiven für die fortschreitende Miniaturisierung und zunehmende Komplexität der technischen Entwicklung. Ebenso tragen Nanopartikel maßgeblich zum ressourcenschonenden Einsatz von Stoffen bei. Neben diesen naheliegenden Aspekten beruht Bedeutung jedoch auf ihren grundsätzlich neuartigen Eigenschaften Funktionen. Diese reichen photonischen Kristallen effizienten Leuchtstoffen, Einzelpartikeln Dünnschichten elektronische...

10.1002/ange.200903053 article DE Angewandte Chemie 2010-01-27

A Br stunt: The first three-dimensional polybromide network is found in [C4MPyr]2[Br20] (see structure of the [Br20]2− network). compound was obtained an ionic-liquid-based synthesis—and with 18:2 contains highest Br0:Br− ratio ever observed.

10.1002/anie.201004804 article EN Angewandte Chemie International Edition 2011-02-24

Abstract A series of 12 dinuclear complexes [Ln 2 Cl 6 (μ‐4,4′‐bipy)(py) ], Ln=Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, ( 1 – , respectively) was synthesized by an anhydrous solvothermal reaction in pyridine. The contain a 4,4′‐bipyridine bridge and exhibit coordination sphere closely related to luminescent lanthanide MOFs based on LnCl 3 4,4‐bipyridine. therefore function as molecular model system provide better understanding the luminescence mechanisms Ln‐N‐MOFs (4,4′‐bipy) ] ⋅...

10.1002/chem.201302504 article EN Chemistry - A European Journal 2013-11-15

The rare case of a metal-triggered broad-band yellow emitter among inorganic-organic hybrid materials was achieved by in situ codoping the novel imidazolate metal-organic framework ∞(3)[Ba(Im)2] with divalent europium. emission maximum this dense is center gap primary light-emitting diode phosphors. Up to 20% Eu2+ can be added replace Ba2+ as connectivity centers without causing observable phase segregation. High-resolution energy-dispersive X-ray spectroscopy showed that incorporation even...

10.1021/ja3121718 article EN Journal of the American Chemical Society 2013-04-12

The nanoparticulate inorganic photosensitizer β-SnWO4 is suggested for photodynamic therapy (PDT) of near-surface tumors via reiterated 5 min blue-light LED illumination. nanoparticles are obtained water-based synthesis and comprise excellent colloidal stability under physiological conditions high biocompatibility at low material complexity. Antitumor antimetastatic effects were investigated with a spontaneously metastasizing (4T1 cells) orthotopic breast cancer BALB/c mouse model. Besides...

10.1021/acsnano.5b03060 article EN ACS Nano 2016-02-19

Phosphate-based inorganic–organic hybrid nanoparticles (IOH-NPs) with the general composition [M]2+[Rfunction(O)PO3]2– (M = ZrO, Mg2O; R functional organic group) show multipurpose and multifunctional properties. If [Rfunction(O)PO3]2– is a fluorescent dye anion ([RdyeOPO3]2–), IOH-NPs blue, green, red, near-infrared fluorescence. This shown for [ZrO]2+[PUP]2–, [ZrO]2+[MFP]2–, [ZrO]2+[RRP]2–, [ZrO]2+[DUT]2– (PUP phenylumbelliferon phosphate, MFP methylfluorescein RRP resorufin DUT...

10.1021/jacs.5b01172 article EN Journal of the American Chemical Society 2015-05-27
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