Understanding the growth of Eu2O3 nanocrystal films made via electrophoretic deposition
Understanding the growth of Eu2O3 nanocrystal films made via electrophoretic deposition
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了解通过电泳沉积制备的 Eu2O3 纳米晶体薄膜的生长
DOI：
10.1088/0957-4484/21/14/145704
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发表时间：
2010
期刊：
影响因子：
3.5
通讯作者：
J. Dickerson
中科院分区：
文献类型：
--
作者：
S. Mahajan;J. Dickerson
采用电泳沉积法（EPD）将油酸表面功能化的Eu2O3纳米晶组装成透明薄膜。将纳米晶体悬浮在非极性溶剂（己烷）中，在阴极和阳极上浇铸成稳定的膜。我们使用光学显微镜，能量色散谱和光致发光光谱表征的双折射膜。扫描电子显微镜和原子力显微镜提供的信息，有关的形态，拓扑结构和表面覆盖的电影。这些均匀的，密集包装的薄膜主要由团聚体（约15 nm）的Eu2O3纳米晶体，而不是单独的纳米晶体。尽管如此，膜具有低均方根（RMS）粗糙度（≤ 1.4nm）。在可见光区的高透明度的膜促进了致密的包装和小直径的团聚体，这减少了由于散射的传输损失。通过表面接触轮廓术研究了EPD工艺参数（施加电压和浓度）对薄膜生长均匀性和厚度的影响。我们发现了所述EPD工艺参数、这些透明膜的总体质量和厚度之间的相关性，这提供了对EPD沉积工艺的机理的深入了解。
Eu2O3 nanocrystals, surface-functionalized with oleic acid, were assembled into transparent thin films via electrophoretic deposition (EPD). Suspended in a non-polar solvent (hexane), the nanocrystals were cast into stable films on both the cathode and the anode. We characterized the nanocrystal films using optical microscopy, energy dispersive spectroscopy and photoluminescence spectroscopy. Scanning electron microscopy and atomic force microscopy provided information regarding the morphology, topology and surface coverage of the films. These homogeneous, densely packed films were composed predominantly of agglomerates (∼15 nm) of the Eu2O3 nanocrystals rather than of individual nanocrystals. Nonetheless, the films possessed low root mean square (RMS) roughness (∼1.4 nm). High transparency of the film in the visible region was facilitated by the dense packing and the small diameter of the agglomerates, which reduced transmission losses due to scattering. The effect of EPD process parameters (applied voltage and nanocrystal concentration) on the growth uniformity and the thickness of the films was examined via surface contact profilometry. We discovered a correlation among the said EPD process parameters, the overall quality and thickness of these transparent films, which provided insight into the mechanisms of the nanocrystal deposition process.