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Articles by Marcus Scheele
Zero Indirect Band Gap and Flat Bands in a Niobium Oxyiodide Cluster Material Click to copy article link Article link copied!
2.1. Synthesis and Crystal Structure The reaction between NbI 4 , Li 2 (CN 2 ) and Li 2 O involves both solid and gaseous phases, and is governed by temperature-dependent equilibria. On heating, the mixture generates a sequence of intermediate solid and vapor phases. The collective experimental observations have led to an assumption of a process that is close to a non-equilibrium system.
The Family of tetranuclear Nb4OI12-x Clusters (x = 0, 1, 2): From the molecular Nb4OI12 cluster to extended chains and layers
The Family of tetranuclear Nb4OI12-x Clusters (x = 0, 1, 2): From the molecular Nb4OI12 cluster to extended chains and layers Unconventional reduction reactions in the Nb-O-I system have produced a number of niobium oxyiodides containing the oxygen-centered [Nb4O] cluster. Crystalline Nb4OI12 and two modifications of Nb4OI11 were structurally characterized by means of single-crystal X-ray diffraction studies.
Reactivatable stimulated emission depletion microscopy using fluorescence-recoverable nanographene - Nature Communications
Abstract Stimulated emission depletion (STED) microscopy, a key optical super-resolution imaging method, has extended our ability to view details to resolution levels of tens of nanometers. Its resolution depends on fluorophore de-excitation efficiency, and increases with depletion laser power. However, high-power irradiation permanently turns off the fluorescence due to photo-bleaching of the fluorophores. As a result, there is a trade-off between spatial resolution and imaging time.
The Rectangular Niobium Oxyiodide Cluster Nb4OI10 – A Narrow Band‐Gap Semiconductor
Introduction Metal-rich niobium halides are known to form cluster compounds with various architectures and oxidation states.1 Well-known examples include the Peierls-distorted chain structure of NbX4,2 triangular niobium clusters in Nb3X8 (X=Cl, Br, I)3 and the octahedral niobium cluster compounds Nb6Cl144 and Nb6I11.5 Beyond these most common clusters, there exist numerous ternary niobium halide cluster compounds.
Dual polarization-enabled ultrafast bulk photovoltaic response in van der Waals heterostructures - Nature Communications
Abstract The bulk photovoltaic effect (BPVE) originating from spontaneous charge polarizations can reach high conversion efficiency exceeding the Shockley-Queisser limit. Emerging van der Waals (vdW) heterostructures provide the ideal platform for BPVE due to interfacial interactions naturally breaking the crystal symmetries of the individual constituents and thus inducing charge polarizations.
Toward Gigahertz Photodetection with Transition Metal Dichalcogenides
Conspectus Transition metal dichalcogenides (TMDCs) exhibit favorable properties for optical communication in the gigahertz (GHz) regime, such as large mobilities, high extinction coefficients, cheap fabrication, and silicon compatibility. While impressive improvements in their sensitivity have been realized over the past decade, the bandwidths of these devices have been mostly limited to a few megahertz.
Colloidal 2D Mo1-xWxS2 Nanosheets: An atomic- to ensemble-level spectroscopic study
Colloidal 2D Mo1-xWxS2 Nanosheets: An atomic- to ensemble-level spectroscopic study Composition dependent tuning of electronic and optical properties in semiconducting two-dimensional (2D) transition metal dichalcogenide (TMDC) alloys is promising for tailoring the materials for optoelectronics. Here, we report a solution-based synthesis suitable to obtain predominatly monolayered 2D semiconducting Mo1-xWxS2 nanosheets (NSs) with controlled composition as substrate-free colloidal inks.
Electronic structure and transport in the potential Luttinger liquids CsNb3Br7S and RbNb3Br7S
Electronic structure and transport in the potential Luttinger liquids CsNb3Br7S and RbNb3Br7S† The crystal structures of ANb3Br7S (A = Rb and Cs) have been refined by single crystal X-ray diffraction, and are found to form highly anisotropic materials based on chains of the triangular Nb3 cluster core. The Nb3 cluster core contains seven valence electrons, six of them being assigned to Nb–Nb bonds within the Nb3 triangle and one unpaired d electron.
Stabilization of Colloidal Germanium Nanoparticles: From the Study to the Prospects of the Application in Thin-Film Technology
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A saddle‐shaped expanded porphyrinoid fitting C60
Abstract We present the synthesis of a new type of an expanded porphyrinoid macrocycle with a saddle-shaped morphology and its complexation of C60 guest molecules. The new macrocycle contains four carbazole and four triazole moieties and can be readily synthesized via a copper-catalyzed click reaction. It shows specific photo-physical properties including fluorescence with a high quantum yield of 60%.
Emergent properties in supercrystals of atomically precise nanoclusters and colloidal nanocrystals
Emergent properties in supercrystals of atomically precise nanoclusters and colloidal nanocrystals Korath Shivan Sugi, †a Andre Maier†a and Marcus Scheele *a Abstract We provide a comprehensive account of the optical, electrical and mechanical properties that emerge from the self-assembly of colloidal nanocrystals or atomically precise nanoclusters into crystalline arrays with long-range order.
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