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Recently, the two-dimensional molybdenum disulfide (MoS2) materials have attracted much interest owing to its potential application in optoelectronics and catalyze. In this paper, nano-MoS2 was prepared via a hydrothermal method through changing the pH value of the precursor solution. The structure and optical properties are systematically studied. The results indicate that laminated MoS2 structure is obtained. The pH value of precursor solution affects the laminated structure. The strong absorption in ultraviolet range and blue emission are observed in the prepared MoS2 structures. The photocatalytic properties of MoS2 by degrading Rhodamine B under ultraviolet light were observed.

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