ABSTRACTLayered nanocomposites of molybdenum disul.de (MoS2) andp oly (ethylene oxide) (PEO) were studied using x-ray di.raction of powder and oriented thin.lm samples. Thermal gravimetric analysis provided information on the composition of the material. The e.ects of the molecular weight of PEO andthe atmospheric relative humidity on the structure were also investigated. A basal plane spacing of 14.3 °, corresponding to an expansion of 8.1 ° between MoS2 layers, was foundfor dry samples, in agreement with the literature. At about 30% humidity, the expansion increases to 10.6°. This increase corresponds approximately to the thickness of one monolayer of water. The spacing is constant until around80% humidity, when the expansion begins to increase again, reaching up to 25 ° near 100% humidity. X-ray coherence lengths in the direction perpendicular to the planes averaged13, 7 and 2 MoS2 layers for the dry, 58% humid and nearly 100% humid samples, respectively.
The Identification of Genes Involved in the Stomatal Response to Reduced Atmospheric Relative Humidity
