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All Journal VALENSI Chemistry Indonesian Journal of Chemical Research Makara Journal of Science
Budi Riza Putra
Division of Analytical Chemistry, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Bogor Agricultural University, Kampus IPB Darmaga, Bogor 16680
Biochemistry, Genetics & Molecular Biology Chemistry Engineering Environmental Science

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Journal : Makara Journal of Science

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An Inkjet-printed Graphene Oxide–poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) Electrode for Nitrite Detection in Water Putra, Budi Riza; Anindya, Weni; Rafi, Mohamad; Kartika, Ika; Thaha, Yudi Nugraha; Ridhova, Aga; Wahyuni, Wulan Tri
Makara Journal of Science Vol. 27, No. 4
Publisher : UI Scholars Hub

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In this study, a screen-printed electrode (SPE) for nitrite (NO2−) sensing was fabricated through an inkjet printing technique using a commercial printer machine and preparing an ink composite solution containing graphene oxide (GO) and poly(3,4 ethylenedioxythiophene) poly(styrene sulfonate) (PEDOT:PSS) as conductive materials. The optimum ink materials for SPE fabrication comprised GO and PEDOT:PSS with binders that resemble the viscosity of commercial ink. The surface topography of the fabricated SPE, which was characterized using scanning electron microscopy and atomic force microscopy, showed a smoother surface compared to the commercial screen-printed carbon electrode, with conductive ink materials deposited primarily from GO/PEDOT:PSS composites. This NO2− sensor exhibited a linear response at the concentration range of 50–1000 µM, with limit of detection and limit of quantification as 25 and 50 µM, respectively. In addition, the stability, reproducibility, and selectivity of this sensor presented acceptable values in the analytical range. Furthermore, the performance of this sensor was compared with that of a spectrophotometry technique using synthetic water samples, and the results revealed its good analytical recovery at a confidence interval of 95%. Thus, our sensor based on SPE-modified GO/PEDOT:PSS, fabricated via the inkjet printing technique, can be potentially applied in monitoring NO2− concentration in real samples.
Electrochemical Sensors Based on Graphene Oxide/PEDOT:PSS Composite Decorated with Bimetallic Gold–Silver Nanoparticles for H2O2 Detection Hidayat, Rayyan Azzahra; Putra, Budi Riza; Khalil, Munawar; Wahyuni, Wulan Tri
Makara Journal of Science Vol. 29, No. 4
Publisher : UI Scholars Hub

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Hydrogen peroxide (H2O2) is a biomarker that indicates oxidative stress levels in the human body; thus, rapid and accurate detection methods are necessary to diagnose various disorders. This study developed a nonenzymatic electrochemical sensor for detecting H2O2 using bimetallic gold–silver nanoparticles (Au–Ag NPs) combined with graphene oxide and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)-modified glassy carbon electrode. The surface properties of the modified electrodes were characterized using scanning electron microscopy–energy dispersive spectroscopy and atomic force microscopy. The electrochemical performance of the modified electrodes was evaluated using cyclic voltammetry, electrochemical impedance spectroscopy, and differential pulse voltammetry. The bimetallic Au-Ag NP-modified electrodes exhibited a higher current response to H2O2 than their monometallic counterparts. The sensor demonstrated a linear response at the H2O2 concentration of 75–200 μM, with a sensitivity of 0.0407 μA μM⁻¹ and a detection limit of 25 μM. Moreover, the modified electrodes demonstrated excellent selectivity for H2O2 and high repeatability of measurements (relative standard deviation < 5%). The detection of H2O2 levels in synthetic urine samples yielded results that were not significantly different from those obtained by the spectrophotometry method, indicating the potential of the developed sensor for clinical applications.
Co-Authors Achmad Fauzi Ahmad, Shahrul Nizam Anindya, Weni Dinda Iryawati Dyah Iswantini Eti Rohaeti Hidayat, Rayyan Azzahra Ika Kartika Kuswanto, Aninda Naszwa M. Rafi Mahat, Mohd Muzamir Manggar Arum Aristri Munawar Khalil Nisa, Ulfiatun Ramadhanti, Desi Ridhova, Aga Rudi Heryanto Thaha, Yudi Nugraha Wulan Tri Wahyuni Zamilah, Nur