Krishnaswamy K. Rangan

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If the full scientific and technological potential of mesostructured materials is to be achieved, systems with continuous domains in the form of single crystals or films must be prepared. Here we report a reliable and facile system for making large single-crystal particles of chalcogenido mesostructured materials with a highly organized cubic structure,(More)
Open framework metal chalcogenide solids, with pore sizes in the nano- and mesoscale, are of potentially broad technological and fundamental interest in research areas ranging from optoelectronics to the physics of quantum confinement. Although there have been significant advances in the design and synthesis of mesostructured silicas, the construction of(More)
V. Petkov, S. J. L. Billinge, P. Larson, S. D. Mahanti, T. Vogt, K. K. Rangan, and M. G. Kanatzidis Department of Physics and Astronomy and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824 Physics Department, Brookhaven National Laboratory, Upton, New York 11973 Department of Chemistry and Center for(More)
We present the first report of hexagonally ordered mesostructured ternary metal tin sulfide materials along with their structure and optical properties. The new mesophases designated as (CP)xMySn2S6 (M ) Zn2+, Cd2+, Ga3+) where synthesized by linking [Sn2S6] clusters with metal ions in the presence of cetylpyridinium (CP) surfactant molecules in formamide(More)
Highly periodic hexagonal honeycombs of platinum-germanium chalcogenide and platinum-tin selenide frameworks were prepared by linking corresponding [Ge(4)Q(10)](4)(-) (Q = S, Se) and [Sn(4)Se(10)](4)(-) clusters with Pt(2+) ions. The non-oxidic honeycombs designated as C(n)PyPtGeQ and C(n)PyPtSnSe were templated by the lyotropic liquid-crystalline phase of(More)
The full three-dimensional structure of Ag-intercalated molybdenum disulfide has been experimentally determined. The atomic pair distribution function (PDF) analysis technique has been employed because of the very limited structural coherence in this nanocrystalline material. We found that at the atomic scale, this compound can be well-described as an(More)
The discovery of MCM-41 and its relatives has spawned a revolution in the design and synthesis of tailored mesostructured oxide-based materials. By comparison, non-oxidic solids such as sulfides or selenides are only very little exploredÐpartly because of difficulties in handling or obtaining relevant precursors (e.g., [SiS4] 4± units). Direct sulfur and(More)
Research on the self-assembly of inorganic clusters around organized sets of organic molecules is of great interest, primarily because of the valuable lessons which could be learned for materials design and due to the potential high impact materials so designed could have in technology.1 Incorporation of electrical properties into nanoand mesostructured(More)
The discovery of MCM-41 and its relatives has spawned a revolution in the design and synthesis of tailored mesostructured oxide-based materials. By comparison, non-oxidic solids such as sulfides or selenides are only very little exploredÐpartly because of difficulties in handling or obtaining relevant precursors (e.g., [SiS4] 4± units). Direct sulfur and(More)
The approach of the atomic pair distribution function (PDF) technique to study the structure of materials with significant disorder is considered and successfully applied to LiMoS2 and mesostructured MnGe4S10. We find that LiMoS2 is built of layers of distorted MoS6 octahedra stacked along the c axis of a triclinic unit cell with well-defined Mo-Mo bonding.(More)