کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9595138 | 1507983 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rapid degradation of alkanethiol-based self-assembled monolayers on gold in ambient laboratory conditions
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کلمات کلیدی
AlkanethiolsNear-edge X-ray absorption fine structure (NEXAFS)Soft X-ray photoelectron spectroscopy - اشعه ماوراء بنفش اشعه ایکسOxidation - اکسیداسیونSelf-assembled monolayers - تک لایه های خودآرا، تک لایه های خودسامانGold - طلاX-ray absorption spectroscopy - طیف سنجی جذب اشعه ایکسphotoelectron spectroscopy - طیف سنجی فوتوالکتریک
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Rapid degradation of alkanethiol-based self-assembled monolayers on gold in ambient laboratory conditions Rapid degradation of alkanethiol-based self-assembled monolayers on gold in ambient laboratory conditions](/preview/png/9595138.png)
چکیده انگلیسی
Self-assembled monolayers (SAMs) consisting of alkanethiols and similar sulfur-containing molecules on noble metal substrates are extensively used and explored for various chemical and biological surface-functionalization in the scientific community. SAMs consisting of thiol- or disulfide-containing molecules adsorbed on gold are commonly used due to their ease of preparation and stability. However, the gold-thiolate bond is easily and rapidly oxidized under ambient conditions, adversely affecting SAM quality and structure. Here, the oxidation of dodecanethiol on gold is explored for various 12-h exposures to ambient laboratory air and light. SAM samples are freshly prepared, air-exposed, and stored in small, capped vials. X-ray photoelectron spectroscopy (XPS) reveals nearly complete oxidation of the thiolate in air-exposed samples, and a decrease in carbon signal on the surface. Near-edge X-ray absorption fine structure spectroscopy (NEXAFS) at the carbon K-edge shows a loss of upright orientational order upon air exposure. Alternatively, the oxidation of the thiolate is minor when SAMs are stored in limited-air-containing small 15Â ml vials. Thus, care must be taken to avoid SAM degradation by ensuring alkanethiolates on gold have sufficient durability for each intended environment and application.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 576, Issues 1â3, 10 February 2005, Pages 188-196
Journal: Surface Science - Volume 576, Issues 1â3, 10 February 2005, Pages 188-196
نویسندگان
Trevor M. Willey, Andrew L. Vance, T. van Buuren, C. Bostedt, L.J. Terminello, C.S. Fadley,