کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4908069 1426590 2017 24 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultra-sensitive phenol sensor based on overcoming surface fouling of reduced graphene oxide-zinc oxide composite electrode
ترجمه فارسی عنوان
سنسور فنول فوق حساس بر اساس برداشتن سطوح مقداری از کاهش الکترود کامپوزیت اکسید گرافین
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی
A major drawback of non-enzymatic approach for phenol detection is surface fouling which results from the electrochemical oxidation of phenol to polymeric products, thereby restraining the electrode process to low concentrations and limited to single time use. In this work, we report a novel approach for stable, non-enzymatic phenol detection using reduced Graphene Oxide (rGO)-Zinc Oxide (ZnO) composite modified Glassy Carbon Electrode (GCE) which eliminates the surface fouling effect by allowing precise selection of the sensing peak. Here, the rGO-ZnO composite was synthesized using a wet chemical method wherein rGO and ZnO were formed in-situ from GO and Zinc Acetate, respectively. The phenol sensing was investigated by differential pulse voltammetry (DPV) which yielded two peaks at 0.35 V and 0.94 V. Phenol detection was performed at a lower potential (0.35 V) as it eliminates the need for surface renewal of the electrode prior to each scan caused due to surface fouling thus facilitating stable and reproducible detection. The as-fabricated sensor responded linearly to phenol over two ranges, one in the range 2-15 μM with a ultrahigh sensitivity of 1.79 μA/μM cm2 and the other in the range 15-40 μM with a sensitivity of 0.389 μA/μM cm2 with good reproducibility, stability, selectivity and a lower detection limit of 1.94 μM. The sensing ability of rGO-ZnO modified GCE was studied in terms of forward biased nano Schottky barriers at the rGO-ZnO interface. This composite based sensor provides a low cost, non-enzymatic and voltammetric detection of phenol in industrial and environmental analyses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 785, 15 January 2017, Pages 26-32
نویسندگان
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