کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
608226 880573 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reactive capture of gold nanoparticles by strongly physisorbed monolayers on graphite
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Reactive capture of gold nanoparticles by strongly physisorbed monolayers on graphite
چکیده انگلیسی

Anthracene Diels Alder adducts (DAa) bearing two long side chains (H–(CH2)22O(CH2)6OCH2–) at the 1- and 5-positions form self-assembled monolayers (SAMs) at the phenyloctane – highly oriented pyrolytic graphite (HOPG) interface. The long DAa side chains promote strong physisorption of the monolayer to HOPG and maintain the monolayer morphology upon rinsing or incubation in ethanol and air-drying of the substrate. Incorporating a carboxylic acid group on the DAa core enables capture of 1–4 nm diameter gold nanoparticles (AuNPs) provided (i) the monolayer containing DAa-carboxylic acids is treated with Cu2+ ions and (ii) the organic coating on the AuNP contains carboxylic acids (11-mercaptoundecanoic acid, MUA–AuNP). AuNP capture by the monolayer proceeds with formation of Cu2+ – carboxylate coordination complexes. The captured AuNP appear as mono- and multi-layered clusters at high coverage on HOPG. The surface density of the captured AuNPs can be adjusted from AuNP multi-layers to isolated AuNPs by varying incubation times, MUA–AuNP concentration, the number density of carboxylic acids in the monolayer, the number of MUA per AuNP, and post-incubation treatments.

Figure optionsDownload high-quality image (112 K)Download as PowerPoint slideHighlights
► Anthracene adducts (DAa) with long side chains form strongly physisorbed monolayers.
► DAa monolayers with CO2H groups capture AuNP–CO2H by treatment with Cu2+ ions.
► AuNP surface density is variable from isolated to multilayers by capture conditions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 387, Issue 1, 1 December 2012, Pages 221–227
نویسندگان
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