کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
601148 879932 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A graphene-based electrochemical sensor for sensitive determination of caffeine
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
A graphene-based electrochemical sensor for sensitive determination of caffeine
چکیده انگلیسی

An electrochemical sensor based on the electrocatalytic activity of graphene (Gr) for sensitive detection of caffeine is presented. The electrochemical behaviors of caffeine on Nafion–Gr modified glassy carbon electrode (Nafion–Gr/GCE) were investigated by cyclic voltammetry and differential pulse voltammetry. The results showed that the Nafion–Gr/GCE exhibited excellent electrocatalytic activity to caffeine. Caffeine can be effectively accumulated at Nafion–Gr/GCE and produce a sensitive anodic peak. Such electrocatalytic behavior of Gr is attributed to its unique physical and chemical properties, e.g., subtle electronic characteristics and strong adsorptive capability. This electrochemical sensor shows an excellent performance for detecting caffeine with a detection limit of 1.2 × 10−7 M (S/N = 3), a reproducibility of 5.2% relative standard deviation, and a satisfied recovery from 98.6% to 102.0%. The sensor shows great promise for simple and sensitive determination of caffeine.

Figure optionsDownload as PowerPoint slideResearch highlights
► Nafion–graphene composite film modified glassy carbon electrode was developed.
► Electrochemical behaviors of caffeine on the modified electrode were investigated by CV and DPV.
► Nafion–graphene/GCE exhibited excellent electrocatalytic activity to caffeine.
► LOD of 1.2 × 10−7 M and RSD of 5.2% were obtained for caffeine detection.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces B: Biointerfaces - Volume 84, Issue 2, 1 June 2011, Pages 421–426
نویسندگان
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