کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
609551 880625 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Self-assembled monolayers of benzenethiol and benzenemethanethiol on Au(1 1 1): Influence of an alkyl spacer on the structure and thermal desorption behavior
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Self-assembled monolayers of benzenethiol and benzenemethanethiol on Au(1 1 1): Influence of an alkyl spacer on the structure and thermal desorption behavior
چکیده انگلیسی

The surface structures, adsorption conditions, and thermal desorption behaviors of benzenethiol (BT) and benzenemethanethiol (BMT) self-assembled monolayers (SAMs) on Au(1 1 1) were examined by means of scanning tunneling microscopy (STM), X-ray photoelectron microscopy (XPS), and thermal desorption spectroscopy to understand the effects of the alkyl spacer between the phenyl group and the sulfur atom. Although XPS spectral shapes in the S 2p region for both SAMs are similar, the surface structures and thermal desorption behaviors differ significantly. BT SAMs on Au(1 1 1) were composed of disordered phases, whereas BMT SAMs have well-ordered phases containing vacancy islands. The strong desorption peak for parent mass species (m/z = 110, C6H5SH+) was observed in BT SAMs at about 500 K, whereas no desorption peak (m/z = 124, C6H5CH2SH+) was observed from BMT SAMs. Interestingly, the dominant TD peak for the benzyl fragments (m/z = 91, C6H5CH2+) formed via C–S bond cleavage was observed in BMT SAMs at around 400 K. From this study, we clearly revealed that the small modification in chemical structure by inserting a methylene spacer between the phenyl group and the sulfur atom affects 2D SAM structures, adsorption conditions, and thermal desorption behaviors and stability. The results obtained here will be very useful in designing and fabricating aromatic thiol SAMs for further applications.

Thermal desorption behavior and surface structure of benzenethiol (BT) and benzenemethanethiol (BMT) self-assembled monolayers on Au(1 1 1) were markedly different from each other, even though these molecules have a similar chemical structure.Figure optionsDownload high-quality image (92 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 342, Issue 2, 15 February 2010, Pages 513–517
نویسندگان
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