Shape- and phase-controlled synthesis of monodisperse, single-crystalline ternary chalcogenide colloids through a convenient solution synthesis strategy.
Shape- and phase-controlled synthesis of monodisperse, single-crystalline ternary chalcogenide colloids through a convenient solution synthesis strategy.
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DOI：
10.1002/chem.200700618
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发表时间：
2007-10
期刊：
影响因子：
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通讯作者：
W. Du;Xuefeng Qian;Jie Yin;Q. Gong
中科院分区：
文献类型：
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作者：
W. Du;Xuefeng Qian;Jie Yin;Q. Gong
采用十六胺作为封端剂，通过一种方便的溶剂热合成方法，成功地合成了胶体状、单分散、单晶锥形CuInS 2和矩形AgInS 2纳米晶。采用X射线衍射、透射电子显微镜（TEM）、高分辨透射电子显微镜（TEM）和X射线能谱仪（EDS）对产物的晶相、形貌、晶格和化学组成进行了表征。结果表明，所合成的CuInS 2胶体为四方相（粒径为13-17 nm），AgInS 2为正交相（粒径为17 ± 0.5 nm）。一个可能的形状演变和晶体生长机制已被建议为金字塔状CuInS 2和矩形AgInS 2胶体的形成。对照实验表明，CuInS 2和正交AgInS 2胶体的形态和/或相变是温度和/或时间依赖性的。CuInS 2胶体在室温下对可见光有很好的吸收，表明其作为太阳能吸收剂的潜在应用。两个光致发光（PL）在1.938和2.384 eV的CuInS 2胶体的PL光谱的子带显示，在CuInS 2晶格内的最近和第二最近的施主-受主对的复合，其中施主缺陷（Cui）占据间隙位置和受主缺陷（VIn）驻留在相邻的阳离子位点。此外，在这项研究中开发的合成策略是方便和廉价的，也可以用来作为一个通用的过程，用于合成其他纯或掺杂的三元硫属化合物，需要控制的大小（或形状）。这一过程可以扩展到其他功能纳米材料的合成。
Colloidal, monodisperse, single-crystalline pyramidal CuInS2 and rectangular AgInS2 nanocrystals were successfully synthesized through a convenient and improved solvothermal process that uses hexadecylamine as a capping reagent. The crystal phase, morphology, crystal lattice, and chemical composition of the as-prepared products were characterized by using X-ray diffraction, transmission electron microscopy (TEM), high-resolution TEM, and energy dispersive X-ray spectroscopy. Results revealed that the as-synthesized CuInS2 colloid is in the tetragonal phase (size: 13-17 nm) and the AgInS2 in the orthorhombic structure (size: 17+/-0.5 nm). A possible shape evolution and crystal growth mechanism has been suggested for the formation of pyramidal CuInS2 and rectangular AgInS2 colloids. Control experiments indicated that the morphology- and/or phase-change of CuInS2 and orthorhombic AgInS2 colloids are temperature- and/or time-dependent. CuInS2 colloids absorb well in the range of visible light at room-temperature, indicating its potential application as a solar absorber. Two photoluminescence (PL) subbands at 1.938 and 2.384 eV in the PL spectra of CuInS2 colloids revealed that the recombination of the closest and the second closest donor-acceptor pairs within the CuInS2 lattice, in which the donor defect (Cui) occupies an interstitial position and the acceptor defect (VIn) resides at an adjacent cation site. In addition, the synthesis strategy developed in this study is convenient and inexpensive, and could also be used as a general process for the synthesis of other pure or doped ternary chalcogenides that require a controlled size (or shape). This process could be extended to the synthesis of other functional nanomaterials.