Large area, molecularly smooth (0.2 nm rms) gold films for surface forces and other studies
Large area, molecularly smooth (0.2 nm rms) gold films for surface forces and other studies
复制标题
DOI：
10.1021/la063738o
复制
发表时间：
2007-07-03
期刊：
影响因子：
3.9
通讯作者：
Klein, Jacob
中科院分区：
文献类型：
--
作者：
Chai, Liraz;Klein, Jacob
使用大面积 (cm(2)) 单晶云母片作为模板基材，我们创建了相应大的模板剥离 (TS) 金膜（厚度 82 +/- 2 nm），其整个区域的粗糙度在 0.2 nm rms 以内。这些金膜在不使用任何脱模溶剂的情况下形成，并使用 AFM、X 射线衍射、等色级多光束干涉条纹 (FECO) 和接触角测量进行表征。这些薄膜在大面积上具有分子光滑性并且（可调节）半透明，特别适合用于表面力平衡（SFB），如通过测量这种平坦的金表面和水中的裸云母表面之间的法向力（F）与距离（D）分布图所示。 F(D) 分布与 DLVO 理论在分子接触方面非常一致，表明金表面在水下带负电。
Using large-area (cm(2)) single-crystal mica sheets as the templating substrate, we have created correspondingly large template-stripped (TS) gold films (thickness 82 +/- 2 nm) that appear smooth to within 0.2 nm rms roughness over their entire area. These gold films, created without the use of any releasing solvent, are characterized using AFM, X-ray diffraction, multiple beam interferometric fringes of equal chromatic order (FECO), and contact angle measurements. Being molecularly smooth over large areas and (adjustably) semitransparent, these films are especially suitable for use in the surface force balance (SFB), as shown by measurements of the normal force (F) versus distance (D) profiles between such a flat gold surface and a bare mica surface in water. The F(D) profiles are in good agreement with DLVO theory down to molecular contact and indicate that the gold surface is negatively charged under water.