Electronic and vibrational properties of Rb-intercalated MoS2 nanoparticles
| Autor: | X. X. Bi, J.M. Holden, W. T. Lee, S. Bandow, R. Ochoa, Y. Maruyama, P. C. Eklund |
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| Rok vydání: | 1995 |
| Předmět: |
Materials science
Mechanical Engineering Doping Intercalation (chemistry) Analytical chemistry Nanoparticle Condensed Matter Physics law.invention symbols.namesake Nanocrystal Mechanics of Materials Transmission electron microscopy law symbols General Materials Science Raman spectroscopy Electron paramagnetic resonance Raman scattering |
| Zdroj: | Materials Science and Engineering: A. 204:222-226 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/0921-5093(95)09965-4 |
| Popis: | Nanoplatelets (diameter about 8 nm) synthesized by laser pyrolysis and bulk powder of MoS2 have been intercalated with Rb to establish the metallic state. The properties of these powders are investigated by Raman scattering, X-ray diffraction, transmission electron microscopy and electron spin resonance (ESR). With increasing time of Rb intercalation the Raman-active interlayer A1g mode is observed to red shift in the nanoplatelet sample and blue shift in the micron-size bulk powder sample. In both samples the Rb doping eventually induces a metallic state and the Raman signal is lost. A broad ESR line was detected for the Rb-saturated MoS2 bulk powder sample, also indicating the metallic character. Owing to the small particle size of the nanoplatelets, no broad line ESR signal was observed for the intercalated nanoplatelets. A low field (ESR) signal was used to search for superconductivity and a Tc = 6.4 K was observed in the bulk, in good agreement with the literature. However, no superconductivity down to 3.5 K was observed in the nanoplatelet sample. |
| Databáze: | OpenAIRE |
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