Formation of nearly monodisperse In2O3 nanodots and oriented-attached nanoflowers:: Hydrolysis and alcoholysis vs pyrolysis
Formation of nearly monodisperse In2O3 nanodots and oriented-attached nanoflowers:: Hydrolysis and alcoholysis vs pyrolysis
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DOI：
10.1021/ja0627601
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发表时间：
2006-08-09
影响因子：
15
通讯作者：
Peng, Xiaogang
中科院分区：
文献类型：
--
作者：
Narayanaswamy, Arun;Xu, Huifang;Peng, Xiaogang
在简单的反应体系中合成了具有点状和花状形状的单晶和近单分散的In2O3纳米晶。该系统使用羧酸铟作为前体，在高温下在烃溶剂中使用或不使用醇作为活化试剂。有限的配体保护 (LLP) 导致纳米点的三维 (3D) 定向附着，从而产生 3D 纳米花。当系统对纳米晶体有足够的配体保护时，发现纳米点是稳定的产物。近单分散的纳米点和纳米花的直径分别在约5至约15 nm和约15至约60 nm的范围内变化。简单的反应系统使得系统研究反应机制以及纳米晶体的生长动力学成为可能。与热解相反，水解和醇解被认为是该系统的主要途径。几乎单分散的纳米点和纳米花都可以通过任一反应途径制备。发现水解是可逆途径，而醇解被证实是不可逆的。因此，足够量的酒精能够迫使纳米晶体（点和花）的产量达到统一。
Single crystalline and nearly monodisperse In2O3 nanocrystals with both dot and flower shapes were synthesized in a simple reaction system. This system used indium carboxylates as the precursors with or without alcohol as the activating reagents in a hydrocarbon solvent under elevated temperatures. Limited ligand protection (LLP) led to three-dimensional (3D) oriented attachment of nanodots, resulting in 3D nanoflowers. When the system had sufficient ligand protection for the nanocrystals, nanodots were found to be the stable products. The diameters of nearly monodisperse nanodots and nanoflowers were varied in a range from similar to 5 to similar to 15 nm and similar to 15 to similar to 60 nm, respectively. The simple reaction system made it possible to have a systematic study of the reaction mechanisms along with the growth kinetics of nanocrystals. Hydrolysis and alcoholysis were identified as the major paths for this system, as opposed to pyrolysis. Both nearly monodispersed nanodots and nanoflowers can be made through either of the reaction pathways. Hydrolysis was found as a reversible pathway, and alcoholysis was confirmed to be irreversible. Consequently, a sufficient amount of alcohol was able to force the yield of nanocrystals, both dots and flowers, to unity.