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Solvothermal Synthesis and Characteristic of Tin Sulfide and Tin Selenide Nanocrystals

Author: HuangJin
Tutor: PengHongRui
School: Qingdao University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Nanoribbons Nanosheets Tin sulfide Tin selenide Tin diselenide Solvothermal
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 344
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Abstract


In recent years , nano- semiconductor materials due to their unique optical and electrical properties, has been a very active area of ??research. Ⅳ - Ⅵ group metal sulfide selenide is an important narrow band gap semiconductor material , the traditional coarse grain materials have been extensively studied and applied. In this thesis, the solvent thermal technology to expand into new microtubes morphology , nano and nano -chip with the growth of the crystal formation mechanism . We transmission electron microscopy, field emission scanning electron microscopy, X -ray diffraction , X-ray energy dispersive spectroscopy , UV - Vis spectroscopy for the synthesis of nano / micro crystals were characterized by analysis and optical performance testing . This thesis work is as follows : the use of ion exchange reaction to Na 2 S as sulfur source , hot conditions in ethylene glycol solvent out of the massive growth of SnS nanobelts . Nanoribbons with a width of 50-300nm, length of 6μm. Structural analysis showed that the synthesized SnS nanobelts are single crystals , preferred growth direction of [ 001 ] . Glycol solvent on the growth of nanoribbons decisive role . Using an alkaline solvent , complexing ability of the reaction pathway , the use of in situ growth of the polymer template-assisted solvothermal prepared at low temperature tubular micro crystal SnS . Thiourea as the sulfur source , ethylenediamine as the solvent, and polyacrylamide dispersant pore size of the resulting product is mainly 0.4 ~ 0.8μm, the length of a few micrometers to tens of micrometers tubular hexahedral crystal . Polyacrylamide gel tubular micro crystal growth on a guiding role . Ethylene glycol assisted ethylenediamine solvothermal to stannous chloride and sodium selenite as reactants synthesized at 180 ℃ for 3h a thickness of about 30nm petaloid SnSe 2 nanosheets , narrow leaves synthesized reaction 10h uniform thickness of 100nm daisy petal SnSe nanosheets . Stannous chloride and selenium powder as reactants , the amount of control the different ethylenediamine reaction at 180 ℃ 3h synthesized uniform thickness of about 100nm tufted SnSe 2 nanosheets at 160 ℃ and reaction 10h synthesized glossy large thickness of about 50nm layered SnSe nanosheets . XRD analysis showed that the crystal structure of the product was hexagonal SnSe 2 and quadrature-phase SnSe.

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