There have been continuous efforts to seek for novel functional two-dimensional semiconductors with high performance for future applications in nanoelectronics and optoelectronics. In this work, we introduce a successful experimental approach to fabricate monolayer phosphorene by mechanical cleavage and the following Ar + plasma thinning process. The thickness of phosphorene is unambiguously determined by optical contrast combined with atomic force microscope (AFM). Raman spectroscopy is used to characterize the pristine and plasma-treated samples. The Raman frequency of A 2 g mode stiffens, and the intensity ratio of A 2 g to A 1 g modes shows monotonic discrete increase with the decrease of phosphorene thickness down to monolayer. All those phenomena can be used to identify the thickness of this novel two-dimensional semiconductor efficiently. This work for monolayer phosphorene fabrication and thickness determination will facilitates the research of phosphorene.
Over the past decades, a worldwide effort has been made to search for alternative anode materials of lithium batteries for improving their energy density and safety.[1] It has been found that 3d transition metal oxides such as nickel oxide, cobalt oxide, and iron oxide exhibit reversible capacities about three times larger than those of graphite (372 mAh g -1
Long Bi2S3
nanowires have been prepared via the thioglyolic acid (HSCH2COOH,
TGA) assisted hydrothermal method. The x-ray diffraction pattern shows that the Bi2S3
nanowires obtained are of orthorhombic phase. High resolution
transmission electron microscopy identifies that the Bi2S3
nanowires are single crystalline in nature. Furthermore, we give a preliminary
presentation of the mechanism for the TGA-assisted hydrothermal synthesis of Bi2S3
nanowires.
The uniform, large-scale, and bilayered ZnO nanorod array on silicon substrate has been synthesized by a catalyst and template-free chemical reaction in a dilute solution. The effect of different precursor ZnO films on the morphology and size of the ZnO nanorod array has been investigated. Moreover, the morphology evolution of the ZnO nanorod array with the increase of reaction time indicates that the second growth is the reason for the decrease of the ZnO nanorod diameter and the formation of the bilayered ZnO nanorod array. Finally, the field emission from the ZnO nanorod array with different diameters is presented.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.