Abstract
In this paper, a single-source precursor, In(S2CNEt2)3 complex, with excellent thermal stability, has been used to synthesize NaInS2 microsphere by a one-step solvothermal method at a very low temperature of 140°C. XRD measurement results show that the achieved NaInS2 microspheres were well-crystallized with a rhombohedral structure. FE-SEM pictures demonstrate the nanoplate layered structure of the sample. The length and thickness of NaInS2 nanoplates were 50–500nm and 16nm, respectively. Because of high surface energy, the nanoplates aggregated into microspheres with a diameter of 0.5–2μm. According to diffuse reflectance spectrum, NaInS2 microspheres were proved to have strong absorption towards the light whose wavelength is less than 400nm (absorption boundary at 400nm). This absorption boundary showed a blue-shift of 50nm compared to the one of micro-sized NaInS2, which can be attributed to the quantum size effect of nanoplates.
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