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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Appropriate Salt Concentration of Nanodiamond Colloids for Electrostatic Self-Assembly Seeding of Monosized Individual Diamond Nanoparticles on Silicon Dioxide Surfaces
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Appropriate Salt Concentration of Nanodiamond Colloids for Electrostatic Self-Assembly Seeding of Monosized Individual Diamond Nanoparticles on Silicon Dioxide Surfaces

机译：纳米金刚石胶体的适当盐浓度，可用于二氧化硅表面上单个单个金刚石纳米粒子的静电自组装接种。

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摘要

Monosized (similar to 4 nm) diamond nanoparticles arranged on substrate surfaces are exciting candidates for single-photon sources and nucleation sites for ultrathin nanocrystalline diamond film growth. The most commonly used technique to obtain substrate-supported diamond nanoparticles is electrostatic self-assembly seeding using nanodiamond colloidal suspensions. Currently, monodisperse nanodiamond colloids, which have a narrow distribution of particle sizes centering on the core particle size (similar to 4 nm), are available for the seeding technique on different substrate materials such as Si, SiO2, Cu, and AlN. However, the self-assembled nanoparticles tend to form small (typically a few tens of nanometers or even larger) aggregates on all of those substrate materials. In this study, this major weakness of self-assembled diamond nanoparticles was solved by modifying the salt concentration of nanodiamond colloidal suspensions. Several salt concentrations of colloidal suspensions were prepared using potassium chloride as an inserted electrolyte and were examined with respect to seeding on SiO2 surfaces. The colloidal suspensions and the seeded surfaces were characterized by dynamic light scattering and atomic force microscopy, respectively. Also, the interaction energies between diamond nanoparticles in each of the examined colloidal suspensions were compared on the basis of the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. From these investigations, it became clear that the appropriate salt concentration suppresses the formation of small aggregates during the seeding process owing to the modified electrostatic repulsive interaction between nanoparticles. Finally, monosized (<10 nm) individual diamond nanoparticles arranged on SiO2 surfaces have been successfully obtained.
机译：排列在基材表面的单尺寸（类似于4 nm）金刚石纳米颗粒是单光子源和超薄纳米晶金刚石膜生长成核位点的令人兴奋的候选者。获得基材支撑的金刚石纳米粒子的最常用技术是使用纳米金刚石胶体悬浮液的静电自组装晶种。当前，具有分散在中心粒径（近似于4nm）上的粒径的窄分布的单分散纳米金刚石胶体可用于在诸如Si，SiO 2，Cu和AlN的不同衬底材料上的播种技术。然而，自组装的纳米颗粒倾向于在所有那些基底材料上形成小的聚集体（通常是几十纳米甚至更大）。在这项研究中，通过修改纳米金刚石胶体悬浮液的盐浓度解决了自组装金刚石纳米颗粒的主要缺点。使用氯化钾作为插入的电解质制备了几种盐浓度的胶态悬浮液，并检查了在SiO2表面上的晶种。胶体悬浮液和种子表面分别通过动态光散射和原子力显微镜表征。此外，根据Derjaguin-Landau-Verwey-Overbeek（DLVO）理论，比较了每个检查的胶体悬浮液中金刚石纳米粒子之间的相互作用能。从这些研究中，可以清楚地看到，由于纳米颗粒之间的静电排斥相互作用得到了改善，因此适当的盐浓度可以抑制接种过程中小聚集体的形成。最后，已经成功地获得了排列在SiO2表面上的单一尺寸（<10 nm）的单个金刚石纳米颗粒。

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