Pyrolysis Synthesis Ofβ-In₂S₃ And Its Optical Properties

In recent years, semiconductor luminescence materials have important influence on medicine, lighting, national defense, and many other areas. Thus it is an urgency to research and develop semiconductor luminescence materials with good performance to meet the development of human society. Binary or ternary sulfide semiconductor such as CuS、In2S3、NiSe、CuInS2 and AgInS2 etc as a very important function material, has wide range of applications in solar cells, catalysis, glow, luminescence, piezoelectric, magnetic materials, linear nonlinear optical instruments, etc, and it has become the focus of chemical material research. Thermal decomposition method has the advantage of high reaction efficiency, penetrate faster between atoms comparing to the traditional method. Based on this, we preparedβ-In2S3 by pyrolysising precursor in three different ways. The mainly research content and research results can be summarized as follows:1. Firstly, The In(S2CNEt2)3phen precursor was synthesized. And thenβ-In2S3 was got by solid pyrolysising the precursor in 300℃,400℃,600℃under the protection of Ar. Characterization by scanning electron microscopy, the product was micro-films with thickness of approximately 3um which is self-assembled by the nanoparticles. Comparing the XRD pattern of the sample adding sulfur atmosphere during pyrolysis to that of without sulfur atmosphere, we found out that the adding of sulfur atmosphere contribute to the improvement of the crystal crysallinity in the pyrolysis process. We think that there exist VIn and Vs simultaneously in the sample by analysis.2. Firstly, we synthesized precursor In(S2CNEt2)3, and then the product In2S3 was obtained by pyrolysising the precursor in oleylamine, oleic acid and octadecene. The oleylamine is necessary in the synthesis of In2S3 through changing the types of solvent and the ratio of the solvent. Characterized by XRD, FTIR, TEM, HRTEM, PL spectrum, the sample is pure hexagonal In2S3 showing layered crystal growth along the (400) and (222), and the sample has the emission band in purple, blue, and green region.3. The distilled water, ethanol, and acetonitrile were used as solvents, whreas oleic acid and citric acid were employed as surfactant in the solvothermal synthesis ofβ-In2S3. By comparing SEM images of the samples synthesized under different conditions, we found out that the particle size increases, the uniformity of the particle size decrease and the sheet assembles into microspheres with regular pores while the oleic acid was used as surfactant. At the same time, acetonitrile is the most appropriate solvent among them.