IJE TRANSACTIONS B: Applications Vol. 31, No. 2 (February 2018) 188-195    Article in Press

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G. Najafpour
( Received: December 11, 2017 – Accepted: January 04, 2018 )

Abstract    A sensitive electrochemical sensor was fabricated for selective detection of nitric oxide (NO) based on electrochemically reduced graphene (ErGO)-polyaniline (PANI)-gold nanoparticles (AuNPs) nanocomposite. It was coated on a gold (Au) electrode through stepwise electrodeposition to form AuNPs-PANI-ErGO/Au electrode. The AuNPs-PANI-rGO nanocomposite was characterized by Field Emission Scanning Electron Microscopy (FESEM) and UV-vis. Electrochemical behavior of modified electrode was analyzed by cyclic voltammetry (CV) and chronoamperometry (CA) techniques. CVs of AuNPs-PANI-ErGO/Au, PANI-ErGO/Au and ErGO/Au electrodes showed that conductivity of AuNPs-PANI-ErGO/Au was higher than others. Nafion was used to improve selectivity of modified electrode. Nafion/AuNPs-PANI-ErGO/Au electrode represented favorable electrochemical and electrocatalytic behavior towards NO oxidation. The resultant electrode exhibited a high sensivity of 0.113 μA/μM over a wide linear range from 0.8 × 10−6 to 86 × 10−6 M with a low detection limit of 2.5 × 10−7 M (S/N=3). In addition, the sensor had excellent stability, as well as reproducibility and selectivity, which makes it possible to detect NO quickly and accurately.


Keywords    Nitric oxide sensor, Reduced graphene oxide, Gold nanoparticle, Polyaniline, Cyclic voltammetry


چکیده    در این مطالعه، یک سنسور الکتروشیمیایی برای شناسایی حساس و انتخاب­پذیر نیتریک اکسید (NO) بر مبنای نانوکامپوزیت گرافن اکسید کاهش یافته الکتروشیمیایی (ErGO)- پلی آنیلین (PANI)- نانوذرات طلا (AuNPs) ساخته شد. این نانوکامپوزیت از طریق الکترودیپوزیشن گام به گام روی یک الکترود طلا (Au) پوشش داده شد تا الکترود AuNPs-PANI-ErGO/Au تشکیل شود. نانوکامپوزیت AuNPs-PANI-rGO به وسیله تکنیک­های UV-vis و FESEM تعیین مشخصه شد. رفتار الکتروشیمیایی الکترود اصلاح شده به وسیله ولتامتری چرخه­ای (CV) و کرونوآمپرومتری (CA) ارزیابی شد. نمودارهای ولتاگرام الکترودهای AuNPs-PANI-ErGO/Au, PANI-ErGO/Au and ErGO/Au نشان داد که هدایت AuNPs-PANI-ErGO/Au از دو مورد دیگر بیشتر بود. از نفیون برای بهبود انتخاب­پذیری الکترود اصلاح شده استفاده شد. الکترود Nafion/AuNPs-PANI-ErGO/Au در مورد اکسیداسیون NO رفتار الکتروکاتالیتیکی و الکتروشیمیایی مطلوبی از خود نشان داد. در شرایط بهینه، الکترود ساخته شده حساسیت بالای μA/μM 113/0 در محدوده خطی وسیع μM 86-8/0 با حد تشخیص پایین μM 25/0 را از خود نشان داد. علاوه بر این، این سنسور پایداری، تکرارپذیری و انتخاب­پذیری بالایی داشت که باعث می­شود بتوان از آن در تشخیص سریع و دقیق NO استفاده کرد.

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