One-pot synthesis of CdTe nanocrystals and shape control of luminescent CdTe-cystine nanocomposites
One-pot synthesis of CdTe nanocrystals and shape control of luminescent CdTe-cystine nanocomposites
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DOI：
10.1002/smll.200500346
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发表时间：
2006-04-01
期刊：
影响因子：
13.3
通讯作者：
Dong, SJ
中科院分区：
文献类型：
--
作者：
Bao, HF;Wang, EK;Dong, SJ
半导体纳米材料因其各种尺寸和形状相关的光学和电学性质而引起了人们的广泛兴趣。在过去的二十年里，人们发展了许多合成高质量半导体纳米晶体的方法。[2，5，11-17]最近，研究人员致力于弥合纳米世界和微观世界，甚至宏观世界之间的差距。有许多关于将纳米晶体包裹在水可混溶的壳层中，将纳米晶体嵌入胶体晶体的空隙中，[19]以及将纳米晶体加入到无机和有机基质中以获得稳定的纳米复合材料的报道。此外，通过将纳米晶体集成到图案化模板、[24，25]一维(1D)纳米结构、[26]和纳米线中，已经实现了几种制备组织良好的纳米结构的策略。[7]由于量子限制，不同尺寸的CdTe纳米晶体具有从绿色到红色的可调发射，在发光器件(LED)、[27]光子晶体、[19]非线性光学器件、[28]和生物标记等工业和生物医学应用中已经得到了大量的研究。[29]到目前为止，已经报道了两种成功的合成方法：在有机相中合成[11-14]和水相合成硫醇封头的CdTe纳米晶。[15-17]在大多数水相方法中，NaHTe和H_2Te作为Te源，需要进行预处理才能合成不稳定的Te前驱体，并且需要配备Schlenk线。在这里，我们报道了一种新颖的一锅法水相合成高荧光硫代修饰的CdTe纳米晶，以亚碲酸钠(Na2TeO_3)为来源。此外，我们还获得了一系列具有有趣的一维和三维超结构的CdTe纳米晶复合材料-一维纳米线和三维微六方柱.
Semiconductor nanomaterials have attracted extensive interest because of their variety of size-and shape-dependent optical and electrical properties.[1–10] Over the past two decades, many methods for synthesizing high-quality semiconductor nanocrystals have been developed.[2, 5, 11–17] More recently, researchers have focused on bridging the gap between the nano world and micro world, or even the macro world. There are numerous reports on encapsulating nanocrystals in water-miscible shells,[18] embedding nanocrystals in the voids of colloidal crystals,[19] and incorporating nanocrystals into inorganic and organic matrices to obtain stable nanocrystal composites.[6, 20–23] In addition, several strategies for fabricating well-organized nanostructures have been achieved by integrating nanocrystals into patterned templates,[24, 25] one-dimensional (1D) nanostructures,[26] and nanowires.[7]CdTe nanocrystals of different sizes have tunable emission from green to red due to quantum confinement, and have been substantially studied in industrial and biomedical applications such as light-emitting devices (LEDs),[27] photonic crystals,[19] nonlinear optical devices,[28] and biological labels.[29] To date, two successful routes have been reported for the synthesis of CdTe nanocrystals: synthesis in the organic phase [11–14] and aqueous synthesis of thiol-capped CdTe nanocrystals.[15–17] In most of the aqueous approaches, NaHTe and H2Te are used as the Te source, which need a pretreatment to synthesize the unstable Te precursors and require equipping with the Schlenk line. Herein, we report a novel one-pot aqueous synthesis of highly fluorescent thiolcapped CdTe nanocrystals using sodium tellurite (Na2TeO3) as the Te source. Furthermore, we obtained a series of CdTe nanocrystal composites with interesting 1D and 3D superstructures—1D nanowires and 3D microhexagonal col-