Characterization of nanocrystalline CdSe by size exclusion chromatography
Characterization of nanocrystalline CdSe by size exclusion chromatography
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DOI：
10.1021/ac0481912
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发表时间：
2005-06-01
影响因子：
7.4
通讯作者：
Colvin, VL
中科院分区：
文献类型：
--
作者：
Krueger, KM;Al-Somali, AM;Colvin, VL
高效阻粒径色谱法（HPSEC）是探测复杂材料粒径和粒径分布的有力工具。本文报道了它在有机溶剂中制备的硒化镉纳米晶体分析中的应用。如果纳米晶体与柱的相互作用最小化，该方法可以直接在溶液中精确测量纳米晶体的水动力直径；该信息与TEM相补充，可以测量各种封堵剂的厚度。虽然单道HPSEC的分辨率限制在1 nm，但我们在这里表明，回收尺寸排除色谱可以应用于评估样品分布的精细细节。最后，半导体纳米晶体可以制成各种形状，其光学特性难以区分。HPSEC可以应用于形状分离的一般问题，我们演示与四足材料。
High-performance size exclusion chromatography (HPSEC) is a powerful tool for probing the size and size distribution of complex materials. Here we report its application to the analysis of cadmium selenide nanocrystals produced in organic solvents. If nanocrystal-column interactions are minimized, this method provides an accurate measure of nanocrystal hydrodynamic diameter directly in solution; such information is complementary to TEM in that it can measure the thickness of various capping agents. While the resolution of single-pass HPSEC is limited to 1 nm, we show here that recycling size exclusion chromatography can be applied to assess the fine details of a sample's distribution. Finally, semiconductor nanocrystals can be made a variety of shapes whose optical characteristics are difficult to distinguish. HPSEC can be applied to the general problem of shape separations which we demonstrate with a tetrapod material.