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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Comment on 'From Nanoparticles to Nanoplates: Preferential Oriented Connection of Ag Colloids during Electrophoretic Deposition'
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Comment on 'From Nanoparticles to Nanoplates: Preferential Oriented Connection of Ag Colloids during Electrophoretic Deposition'

机译：关于“从纳米颗粒到纳米板：电泳沉积过程中Ag胶体的定向连接”的评论

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The preparation of nanostructured materials possessing unique physicochemical characteristics represents one of the central tasks of incoming era of nanotechnology. After initial research focus in development of reproducible preparation methods of well separated and stable nanoparticles of inorganic and organic materials, the current research is oriented at preparation of nanoparticles' organized assemblies, most often nanostructured layers on the surface of a suitable solid substrate. Electrophoretic deposition d(EPD) of inorganic nanoparticulate materials onto electrode surface represents a simple yet relatively well reproducible method of preparation of nanostructured layers. Originally, the EPD was used for the preparation of nanostructured layers of oxidic or metallic materials to assemble advanced composites. The authors S. Yang, W. Cai, G. Liu, and H. Zeng used the EPD method to deposit silver nanoparticles prepared by laser ablation onto the surfaces of Si wafers. In this article the authors describe the used experimental procedure, which allows influence of the morphology of formed nanostructured layers by varying the intensity of current flowing through the EPD cell. At the same time, the authors attempted to offer the physicochemical description of this process. Despite indisputable and excellent practical results achieved in this work, substantial reservations can be raised concerning the validity of the proposed mechanism of the formation of the prepared nanostructured layers. The authors preclude that nanostructured layers on the surface of Si wafers are formed owing to the process of the oriented connection of primary silver nanoparticles, prepared by laser ablation. The nanoparticles are supposed to orient itself during the electrophoretic movement through the dispersion and then grow during mutual collisions by aggregation mechanism to form structures of denned geometry (e.g., nanoplates), which subsequently settle on the Si surface. This hypothesis can, however, be seriously questioned despite the fact that the article is missing some pieces of information such as a positive value of ζ potential of the primarily prepared silver nanoparticles and that formation of nanoplates on the cathode in the used electrophoretic system seems to give support for the proposal by the authors of the physical mechanism of nanostructured layer formation.
机译：具有独特的理化特性的纳米结构材料的制备代表了纳米技术时代的中心任务之一。在最初的研究专注于开发可分离的，稳定的无机和有机材料纳米颗粒的可再现制备方法之后，当前的研究方向是制备纳米颗粒的有组织的组装体，通常是在合适的固体基质表面上形成纳米结构的层。无机纳米颗粒材料在电极表面的电泳沉积d（EPD）代表了一种制备纳米结构层的简单但相对可重复的方法。最初，EPD用于制备氧化性或金属性材料的纳米结构层，以组装高级复合材料。作者S. Yang，W. Cai，G. Liu和H. Zeng使用EPD方法将通过激光烧蚀制备的银纳米颗粒沉积到Si晶片的表面上。在本文中，作者描述了所使用的实验程序，该程序允许通过改变流经EPD电池的电流强度来影响所形成的纳米结构层的形态。同时，作者试图提供该过程的物理化学描述。尽管在这项工作中获得了无可争议的出色的实际结果，但是对于所提出的制备纳米结构层的机制的有效性，可以提出很多保留意见。作者排除了由于通过激光烧蚀制备的初级银纳米颗粒的定向连接过程而在Si晶圆表面形成纳米结构层的可能性。假定纳米粒子在电泳运动中通过分散体使其自身取向，然后在相互碰撞过程中通过聚集机制生长以形成具有凹陷几何形状的结构（例如，纳米板），其随后沉降在Si表面上。然而，尽管该文章缺少一些信息，例如最初制备的银纳米颗粒的ζ电位正值，以及所使用的电泳系统在阴极上形成纳米板，但该假设仍可受到严重质疑。为作者提出的有关纳米结构层形成的物理机制的建议提供支持。

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