Lee Yong Man, Park Dong Kyu, Choe Woo-Seok, Cho Sung Min, Han Gui Young, Park Juhyun, Yoo Pil J
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Republic of Korea.
J Nanosci Nanotechnol. 2009 Dec;9(12):7467-72. doi: 10.1166/jnn.2009.1755.
We investigate the effect of film deposition methods on the film properties of layer-by-layer assembled polyelectrolyte multilayers. Multilayered structures of linear polyethylenimine (LPEI) and poly(acrylic acid) (PAA) are prepared by using conventional dipping-based assembly as well as spin-assisted assembly. While the polyelectrolyte interpenetration by the diffusion motion of LPEI species is allowed in dipping-based assembly, an instantaneously and kinetically frozen phase of the film deposition is obtainable from spin-assisted assembly. Being kept from the interdiffusion of LPEI, a stratified internal structure is expected in the spin-assisted assembly, which is completely contrasted to the intermixed phase in the dipping-based assembly. The ability to control the inner structure of the multilayered film enables us to manipulate the physical properties or chemical activity of the functionalized thin films. We also demonstrate that the control over the strength of polyelectrolyte interdiffusion on a very top surface can be utilized for a quantitative manipulation on the degree of macromolecular self-assembly of nanomaterials.
我们研究了薄膜沉积方法对逐层组装的聚电解质多层膜薄膜性能的影响。通过传统的基于浸渍的组装以及旋转辅助组装制备了线性聚乙烯亚胺（LPEI）和聚丙烯酸（PAA）的多层结构。在基于浸渍的组装中，LPEI物种的扩散运动允许聚电解质相互渗透，而旋转辅助组装可获得薄膜沉积的瞬时且动力学冻结的相。由于LPEI的相互扩散被阻止，旋转辅助组装中预期会出现分层的内部结构，这与基于浸渍的组装中的混合相形成了完全对比。控制多层膜内部结构的能力使我们能够操纵功能化薄膜的物理性质或化学活性。我们还证明，对非常顶部表面上聚电解质相互扩散强度的控制可用于对纳米材料大分子自组装程度的定量操纵。
