Water-stable photoluminescent semiconductor nanocrystal complexes and method of making same
    3.
    发明授权
    Water-stable photoluminescent semiconductor nanocrystal complexes and method of making same 失效
    水稳定光致发光半导体纳米晶复合物及其制备方法

    公开(公告)号:US06872450B2

    公开(公告)日:2005-03-29

    申请号:US10616975

    申请日:2003-07-11

    IPC分类号: C09K11/02 B32B5/16

    摘要: A method for preparing water-stable semiconductor nanocrystal complexes that can be stably coupled to tertiary molecules using a self-assembled coating of diblock polymers. The diblock polymers have hydrophilic ends containing hydrophilic functional groups and hydrophobic ends containing hydrophobic functional groups. The diblock polymers are assembled around a semiconductor nanocrystal having a lyophilic surface outer layer. The diblock polymers are further crosslinked via bridging molecules that link adjacent diblock polymers through the hydrophilic functional groups of the hydrophilic ends of the diblock polymers to form a semiconductor nanocrystal complex. The functional groups present on the outer surface of the amphiphilic diblock polymer may serve as attachment sites for coupling tertiary molecules to the semiconductor nanocrystal complex.

    摘要翻译: 一种制备水稳定半导体纳米晶体络合物的方法,其可以使用二嵌段聚合物的自组装涂层稳定地与三级分子偶联。 二嵌段聚合物具有含有亲水官能团的亲水末端和含有疏水官能团的疏水末端。 二嵌段聚合物组装在具有亲液表面外层的半导体纳米晶体周围。 二嵌段聚合物通过桥连分子进一步交联,该桥连分子通过二嵌段聚合物的亲水端的亲水官能团连接相邻的二嵌段聚合物以形成半导体纳米晶体复合物。 存在于两亲性二嵌段聚合物的外表面上的官能团可以用作将三级分子偶联到半导体纳米晶体络合物的附着位点。

    Synthesis of colloidal nanocrystals
    4.
    发明授权
    Synthesis of colloidal nanocrystals 有权
    胶体纳米晶体的合成

    公开(公告)号:US06872249B2

    公开(公告)日:2005-03-29

    申请号:US09971780

    申请日:2001-10-04

    摘要: A method of synthesizing colloidal nanocrystals is disclosed using metal oxides or metal salts as a precursor. The metal oxides or metal salts are combined with a ligand and then heated in combination with a coordinating solvent. Upon heating, the metal oxides or salts are converted to stable soluble metal complexes. The metal complexes are formed by cationic species combining with the ligands and/or with the coordinating solvent. Finally, an elemental chalcogenic precursor, for example, Se, Te, or S, is introduced into the soluble metal complex to complete the formation of the nanocrystals at a controllable rate. High-quality CdSe, CdTe, and CdS nanocrystals are produced when CdO is used as the cadmium precursor. With the present method, the size, size distribution, and shape (dots or rods) of the resulting nanocrystals can be controlled during growth. For example, the resulting nanocrystals are nearly monodisperse without any size separation. Further, the method represents a major step towards a green chemistry approach for synthesizing high-quality semiconductor nanocrystals.

    摘要翻译: 公开了使用金属氧化物或金属盐作为前体的合成胶态纳米晶体的方法。 将金属氧化物或金属盐与配体结合,然后与配位溶剂组合加热。 加热时,金属氧化物或盐转化为稳定的可溶性金属配合物。 金属络合物由与配体和/或配位溶剂结合的阳离子物质形成。 最后,将元素硫属前体,例如Se,Te或S引入到可溶性金属络合物中,以可控速率完成纳米晶体的形成。 当CdO用作镉前体时,产生了高质量的CdSe,CdTe和CdS纳米晶体。 使用本方法,可以在生长期间控制所得纳米晶体的尺寸,尺寸分布和形状(点或棒)。 例如,所得到的纳米晶体几乎是单分散的,没有任何尺寸的分离。 此外,该方法代表了用于合成高质量半导体纳米晶体的绿色化学方法的主要步骤。