2,089 publications from this institution
EELS and XPS studies show the presence of both adsorbed atomic and molecular oxygen at low temperatures. The nature of the oxide layer formed on the surface has been characterized by angular dependent and variable temperature EELS. A loss peak around 550 cm−1 is assigned to an electronic transition.
Surface-enhanced Raman spectra (SERS) of pyridine have been investigated on the surfaces of the metallic ReO3 nanocrystals with diameters in the range of 12−32.5 nm. On ReO3 nanocrystal surfaces, the Raman bands of pyridine generally shift toward lower frequencies, accompanied by enhancement of intensity. The frequency shift does not vary with particle size, but band intensification is highest with the 17 nm nanocrystals. The study establishes how an oxide metal can be employed equally effectively to observe SERS of molecules. On the basis of the success with the study of pyridine, we have extended the study to SERS of pyrimidine and pyrazine on 17 nm ReO3 nanocrystals. The SERS effect observed in the three aza-aromatics demonstrates the presence of bonding interaction between the ReO3 surface and the adsorbed molecules.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
No abstract is provided for this article.
UPS and XPS studies indicate that carbon monoxide preferentially adsorbs dissociatively on the surfaces ofthe metallic glasses, Ni76B12Si12 and Fe40Ni38Mo4B18, suggesting that such metglasses could be potential catalysts for some of the reactions involving CO.
No abstract is provided for this article.
No abstract is provided for this article.
Bulk silver and nickel are less reactive than small clusters of these elements, as reactivity studies with O 2 as well as with H 2 S and CO prove. The dissociation of O 2 on small Ag clusters is favored, and the proportion of O 2 molecules cleaved does not depend upon temperature, as is the case for larger clusters and silver metal. The change in reactivity is greatest at the metal–insulator transition—a finding that has implications for heterogeneous catalysis.
Employing photo-emission and Auger electron spectroscopy, it is shown that La1.8Sr0.2CuO4 contains O22--type species and Cu1+ ions, proportions of these species increase with decreasing temperature. These species may play an important role in the high-temperature superconductivity of this oxide.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Graphene has generated great sensation due to its amazing properties, and extensive research is being pursued on single- as well as bi- and few-layer graphenes. In this Perspective, we highlight some aspects of graphene synthesis, surface, magnetic, and mechanical properties, as well as effects of doping and indicate a few useful directions for future research.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
K2Pb[Cu(NO2)6] and [N(CH3)4]2MX4 (M = Mn, Co, Cu or Zn and X = Cl or Br) undergo phase transitions which involve incommensurate phases. The transitions have been investigated by examining the changes in the NO2 and CH3 vibration bands in the i.r. spectra. Splitting and broadening of some of the bands across the incommensurate transitions are discussed in the context of geometrical restrictions in the incommensurate phases. The phase transitions have also been characterized using differential scanning calorimetry.
