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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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Abstract

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 Abdul Rohman Achmad Fauzi Achmad Fauzi Aditya Widianto Afifah, Salmi Agus Kartono Ahmad, Shahrul Nizam Aji Hamim Wigena Aninda Naszwa Kuswanto Anindya, Weni Antonio Kautsar Apriana, Ria Apriliani Rahmat Asoka, Shadila Fira Badrunanto Badrunanto Badrunanto, Badrunanto Bambang Prajogo Eko Wardojo Budi Riza Putra Budi Riza Putra Budi Riza Putra Darusman Pitria, Latifah K Desi Herliani Dinda Iryawati Dyah Iswantini Eka Widya Nugraha Era Rahmi Erna Subroto Eti Rohaeti Fransiska Devy Junardy Hera Nirwati Herdiyanto Herdiyanto Herdiyanto Herdiyanto Herliani, Desi Hidayat, Rayyan Azzahra Ika Kartika Irma Herawati Suparto Irmanida Batubara Irmanida Batubara Karomah, Alfi Hudatul Kilala Tilaar Kuswanto, Aninda Naszwa Latifah K Darusman Latifah K Darusman latifah K Darusman Latifah K Darusman Pitria Latifah K. Darusman LATIFAH KOSIM DARUSMAN Latifah Kosim Darusman Latifah Kosim Darusman Luthfiana, Widya M. Rafi Mahat, Mohd Muzamir Maily Mustofa Makmum Syafi’i Manggar Arum Aristri Martha, Ina Moh Arif Rohman Nur Hakim Moh Nur Hakim Mohamad Rafi Muhammad Bachri Amran Muhammad Farid Munawar Khalil Munawaroh, Fauziyatul Nevianti Zamany Nisa, Ulfiatun Novik Nurhidayat Nur Zamilah Nurdiani Nurdiani Nursifa Mawadah Rahmat, Apriliani Ramadhanti, Desi Rany Zalvianita Reni Febriani Reni Febriani, Reni Ria Apriana Ridhova, Aga Rika Indri Astuti Rizna Azrianiningsari Rudi Heryanto Saat Egra Salmi Afifah Selvitia Ulandari Septaningsih, Dewi Anggraini Setyanto Tri Wahyudi Silvia, Riva Silviani, Dea Siti Aisyah SITI SA’DIAH Sri Purwanti Sri Purwanti Sri Purwanti Sukendi, Yeli Suparto, Irma Syafi’i, Makmum Syarifah Meutiah Eka Sari Syifa Muflihah Tamida Elinda Thaha, Yudi Nugraha Trivadila Wahyuni Ulfiatun Nisa Ulfiatun Nisa Utami Dyah Syafitri Waras Nurcholis Widianto, Aditya Wulansari, Laela Yessie Widya Sari Yogo Suro Priyadi Yusuf Ryadi Zamilah, Nur