Eduardus Ariasena, Aldyla Nisa Raditya, Nadia Salsabila, Geolita Ihsantia Ning Asih, Uperianti, Rizky Indah Sari, Murni Handayani, Rikson Siburian, Cepi Kurniawan, Nuni Widiarti, Irkham, Yeni Wahyuni Hartati, Isa Anshori
Gold nanodendrite (AuND) is a type of gold nanoparticles with dendritic or branching structures that offers advantages such as large surface area and high conductivity to improve electrocatalytic performance of electrochemical sensors. AuND structures can be synthesized using electrodeposition method utilizing cysteine as growth directing agent. This method can simultaneously synthesize and integrate the gold nanostructures on the surface of the electrode. We conducted a comprehensive study on the synthesis of AuND on screen-printed carbon electrode (SPCE)-based working electrode, focusing on the optimization of electrodeposition parameters, such as applied potential, precursor solution concentration, and deposition time. The measured surface oxide reduction peak current and electrochemical surface area from cyclic voltammogram were used as the optimization indicators. We confirmed the growth of dendritic gold nanostructures across the carbon electrode surface based on FESEM, EDS, and XRD characterizations. We applied the SPCE/AuND electrode as a nonenzymatic sensor on ascorbic acid (AA) and obtained detection limit of 16.8 μM, quantification limit of 51.0 μM, sensitivity of 0.0629 μA μM−1, and linear range of 180–2700 μM (R2 value = 0.9909). Selectivity test of this electrode against several interferences, such as uric acid, dopamine, glucose, and urea, also shows good response in AA detection. © The Author(s) 2024.
Lab-on-Chip Laboratory, Biomedical Engineering Department, School of Electrical Engineering and Informatics, Bandung Institute of Technology, Bandung, Indonesia; Department of Nanotechnology, Graduate School, Bandung Institute of Technology, Bandung, Indonesia; Electrical Engineering Master Program, School of Electrical Engineering and Informatics, Bandung Institute of Technology, Bandung, Indonesia; Research Center for Nanotechnology Systems, National Research and Innovation Agency (BRIN), Tangerang Selatan, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan, 20155, Indonesia; Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang, Semarang, 50229, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Padjajaran University, Sumedang, Indonesia; Research Center for Nanosciences and Nanotechnology (RCNN), Bandung Institute of Technology, Bandung, Indonesia
