Ressier L, Le Nader V
Université de Toulouse, INSA, UPS, CNRS, LPCNO, 135 avenue de Rangueil, F-31077 Toulouse, France.
Nanotechnology. 2008 Apr 2;19(13):135301. doi: 10.1088/0957-4484/19/13/135301. Epub 2008 Feb 26.
Electrostatic nanopatterning of poly(methylmethacrylate) (PMMA) thin films by atomic force microscopy (AFM) charge writing was investigated using Kelvin force microscopy (KFM). The lateral size of the electrostatic patterns and the amount of injected charges are closely correlated and can be controlled by the height of the voltage pulses applied to the AFM tip and the tip-sample separation during the writing process. Charge retention measurements show that PMMA has excellent charge storage properties in air under relative humidities from 1% to 60% and withstands immersion in ultra-pure water. This study thus reveals that PMMA is a very promising electret to create efficient electrostatic nanopatterns for directed self-assembly of nanoscale objects, including the broad range of colloidal particles or molecules in aqueous solutions.
利用开尔文力显微镜（KFM）研究了通过原子力显微镜（AFM）电荷写入对聚甲基丙烯酸甲酯（PMMA）薄膜进行静电纳米图案化。静电图案的横向尺寸与注入电荷量密切相关，并且可以通过在写入过程中施加到AFM针尖的电压脉冲高度以及针尖 - 样品间距来控制。电荷保持测量表明，PMMA在1%至60%的相对湿度下于空气中具有优异的电荷存储性能，并且能够承受浸入超纯水中。因此，本研究表明，PMMA是一种非常有前景的驻极体，可用于创建高效的静电纳米图案，以实现纳米级物体的定向自组装，包括水溶液中的各种胶体颗粒或分子。
