Hong Jinkee, Kang Sang Wook
Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge 02139, USA.
J Nanosci Nanotechnol. 2011 Sep;11(9):7771-6. doi: 10.1166/jnn.2011.4737.
We performed a comparative surface analysis of all-carbon nano-objects (multiwall carbon nanotubes (MWNT) or graphene oxide (GO) sheets) based multilayer coatings prepared using three widely used nanofilm fabrication methods: dip-, spin-, and spray-assisted layer-by-layer (LbL) deposition. The resultant films showed a marked difference in their growth mechanisms and surface morphologies. Various carbon decorative coatings were synthesized with different surface roughness values, despite identical preparation conditions. In particular, smooth to highly rough all-carbon surfaces, as determined by atomic force microscopy (AFM) and scanning electron microscopy (SEM), were readily obtained by manipulating the LbL deposition methods. As was confirmed by the AFM and SEM analyses, this finding indicated the fundamental morphological evolution of one-dimensional nano-objects (MWNT) and two-dimensional nano-objects (GO) by control of the surface roughness through the deposition method. Therefore, an analysis of the three LbL-assembly methods presented herein may offer useful information about the industrial use of carbon decorative coatings and provide an insight into ways to control the structures of multilayer coatings by tuning the morphologies of carbon nano-objects.
我们对使用三种广泛应用的纳米薄膜制备方法（浸涂、旋涂和喷雾辅助逐层（LbL）沉积）制备的基于全碳纳米物体（多壁碳纳米管（MWNT）或氧化石墨烯（GO）片）的多层涂层进行了对比表面分析。所得薄膜在其生长机制和表面形态上表现出显著差异。尽管制备条件相同，但合成了具有不同表面粗糙度值的各种碳装饰涂层。特别是，通过原子力显微镜（AFM）和扫描电子显微镜（SEM）测定，通过操控LbL沉积方法可以轻松获得从光滑到高度粗糙的全碳表面。正如AFM和SEM分析所证实的，这一发现表明通过沉积方法控制表面粗糙度，一维纳米物体（MWNT）和二维纳米物体（GO）发生了基本的形态演变。因此，本文对三种LbL组装方法的分析可能会为碳装饰涂层的工业应用提供有用信息，并深入了解通过调整碳纳米物体的形态来控制多层涂层结构的方法。
