Increased crystallinity of octadecylphosphonic acid Langmuir-Blodgett films with an increasing number of layers

被引：0

作者：

Zhao, F. Z. ^{[1
]}

Dey, R. ^{[1
,2
]}

Nie, H. -Y. ^{[1
,2
]}

Lau, W. M. ^{[1
,2
,3
,4
]}

机构：

[1] Univ Western Ontario, London, ON N6G 0J3, Canada

[2] Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada

[3] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada

[4] China Acad Engn Phys, Chengdu Dev Ctr Sci & Technol, Chengdu Green Energy & Green Mfg Technol R&D Ctr, Chengdu 610207, Peoples R China

来源：

THIN SOLID FILMS | 2013年 / 537卷

基金：

加拿大创新基金会;

关键词：

Octadecylphosphonic acid; Langmuir-Blodgett films; molecular headgroups; Si wafer; atomic force microscopy; molecular-resolution images; even-numbered LB films; increased crystallinity; ATOMIC-FORCE MICROSCOPY; SELF-ASSEMBLED MONOLAYERS; FRICTIONAL-PROPERTIES; GOLD; MICA; RESOLUTION; AU(111); ALKANETHIOLS; DISULFIDES; MOLECULES;

D O I：

10.1016/j.tsf.2013.04.117

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report that contact mode atomic force microscopy (AFM) imaging is useful in revealing crystallinity of octadecylphosphonic acid (OPA) Langmuir-Blodgett (LB) films. On a monolayer OPA LB film prepared on the native oxide of a Si wafer, no molecular-resolution could be obtained. However, molecular-resolution images were obtained on a bilayer surface, a reflection that molecules in the top layer adjust their alkyl chains to accommodate those from below to form a closely packed, OPA headgroup-terminated surface. We demonstrate that with an increasing number of layers, the crystallinity of multilayer OPA LB films improves as molecular-resolution AFM images obtained on even-numbered multilayers reveal that the terminating OPA headgroups form a sheet of hexagonal array. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：242 / 246

页数：5

共 30 条

[1] ATOMIC RESOLUTION IMAGING OF A NONCONDUCTOR BY ATOMIC FORCE MICROSCOPY [J].