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All Journal Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Journal of General Education and Humanities
Hayat, Moh
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Humanities Chemistry Languange, Linguistic, Communication & Media Mathematics Other

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Level of Student Satisfaction with the Performance of Electrochemical Analysis Practice Instructors Hayat, Moh; Muchyidin, Arif; Asrorudin, Udin
Journal of General Education and Humanities Vol. 4 No. 1 (2025): February
Publisher : MASI Mandiri Edukasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58421/gehu.v4i1.399

Abstract

This study aims to analyze student satisfaction with instructors' performance in Electrochemical Analysis Practice at AKA Bogor Polytechnic. This study uses a quantitative approach with a survey method. Data was collected through a questionnaire based on the Likert scale, which was distributed to 23 students who had completed the course. Data analysis is carried out descriptively with frequency and percentage calculations, then converted into qualitative information. The study results showed that the overall level of student satisfaction was in the "good" category, with an average of 72.24%. The aspect of professionalism obtained the highest score (73.62%), while the aspect of practice implementation had the lowest score (69.56%). These results show that even though students are satisfied, there is room for improvement, especially in implementing practice. The main recommendations are developing technology-based teaching materials, improving laboratory equipment, and providing more comprehensive practical tutorials. This finding is expected to improve the quality of electrochemistry practicum learning.
Development and Characterization of Gold Nanoparticle-Modified SPCEs for the Electrochemical Sensing Diksy, Yuris; Tirta, Ardina Purnama; Herawati; Mulyawan, Reza; Hayat, Moh; Asrodudin, Udin
Indonesian Journal of Chemical Studies Vol. 4 No. 2 (2025): Indones. J. Chem. Stud. December 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i2.71

Abstract

Gold nanoparticles were successfully synthesized by reducing HAuCl4 using jengkol (Archidendron pauciflorum) extract as a reductant. The synthesized gold nanoparticles were characterized by UV–vis spectroscopy and particle size analyzer (PSA). The synthesized gold nanoparticles were deposited on the screen printed carbon electrode (SPCE) substrate using 2 methods, drop casting and differential pulse voltammetry over a potential range of (-1500) mV to 600 mV, scan rate of 100 mV/s for 5 cycles. The surface plasmon resonance (SPR) band of UV– Vis spectrum at 530.7 nm confirmed the presence of gold nanoparticles. The results of Au nanoparticle characterization using PSA show that the size of the Au-NPs formed is 33.5 nm with an optimal HAuCl4 concentration of 0.20 mM. Characterization of gold nano-deposited SPCE was carried out by measuring the peak current of the 1 mM K3Fe(CN)6/K4Fe(CN)6 system in KCl electrolyte solution (0.1 M) using cyclic voltammetry over a potential range of (-500) mV to 1000 mV, scan rate 100 mV/s for 5 cycles. Gold nanoparticles deposited by differential pulse voltammetry showed a higher current response compared to drop casting deposition.
Co-Authors Arif Muchyidin Asrodudin, Udin Asrorudin, Udin Diksy, Yuris Herawati Mulyawan, Reza Tirta, Ardina Purnama