模板剥离金表面和高度有序自组装单分子层的扫描隧道显微镜研究

Scanning tunneling microscopy of template-stripped Au surfaces and highly ordered self-assembled monolayers.

作者信息

Lee Sangyeob, Bae Sung-Soo, Medeiros-Ribeiro Gilberto, Blackstock Jason J, Kim Sehun, Stewart Duncan R, Ragan Regina

机构信息

Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92697, USA.

出版信息

Langmuir. 2008 Jun 17;24(12):5984-7. doi: 10.1021/la800265q. Epub 2008 May 10.

DOI:10.1021/la800265q

PMID:18471004

Abstract

Template stripping of Au films in ultrahigh vacuum (UHV) produces atomically flat and pristine surfaces that serve as substrates for highly ordered self-assembled monolayer (SAM) formation. Atomic resolution scanning tunneling microscopy of template-stripped (TS) Au stripped in UHV confirms that the stripping process produces a flat, predominantly 111 textured, atomically clean surface. Octanethiol SAMs vapor deposited in situ onto UHV TS Au show a c(4 x 2) superlattice with (square root 3 x square root 3) R30 degrees basic molecular structure having an ordered domain size up to 100 nm wide. These UHV results validate the TS Au surface as a simple, clean and high-quality surface preparation method for SAMs deposited from both vapor phase and solution phase.

摘要

在超高真空（UHV）中对金膜进行模板剥离可产生原子级平整且纯净的表面，这些表面可作为用于形成高度有序自组装单分子层（SAM）的基底。对在超高真空下进行模板剥离（TS）的金进行原子分辨率扫描隧道显微镜观察证实，剥离过程产生了一个平整的、主要为111织构的、原子级清洁的表面。原位气相沉积在超高真空TS金上的辛烷硫醇SAM呈现出c(4x2)超晶格，其具有（√3x√3）R30°基本分子结构，有序畴尺寸可达100 nm宽。这些超高真空实验结果验证了TS金表面是一种用于从气相和溶液相沉积SAM的简单、清洁且高质量的表面制备方法。