Deteksi Asam Askorbat menggunakan Screen Printed Carbon Electrode (SPCE) termodifikasi Nanoselulosa Polipirol-Oksida Grafena

Fortuna, Gabriella Putri (2025) Deteksi Asam Askorbat menggunakan Screen Printed Carbon Electrode (SPCE) termodifikasi Nanoselulosa Polipirol-Oksida Grafena. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sensor elektrokimia untuk deteksi asam askorbat telah dikembangkan menggunakan Screen-Printed Carbon Electrode (SPCE) termodifikasi nanoselulosa-polipirol-oksida grafena. Penelitian ini dilakukan melalui tiga tahapan utama, yaitu:(1) sintesis nanoselulosa dan karakterisasinya menggunakan Particle Size Analyzer (PSA), (2) modifikasi sensor SPCE menggunakan nanoselulosa-polipirol-oksida grafena (SPCE/NC-PPy-GO) dan karakterisasi morfologi permukaan SPCE menggunakan Scanning Electron Microscopy Energy Dispersive X-ray Spectroscopy (SEM- EDX), (3) pengujian kinerja SPCE/NC-PPy-GO menggunakan teknik voltametri siklik pada rentang potensial -0,6 V hingga 0,6 V. Hasil karakterisasi PSA menunjukkan ukuran nanoselulosa berada pada rentang 280-420 nm. Hasil SEM menunjukkan bahwa morfologi permukaan SPCE/NC-PPy-GO berbentuk lembaran oksida grafena yang tidak beraturan dibandingkan SPCE tanpa modifikasi yang tampak berbentuk lembaran. Kinerja SPCE/NC-PPy-GO dalam deteksi asam askorbat diperoleh pada rentang linear dari 0 hingga 20 mM dengan batas deteksi sebesar 0,351 mM. Sensor tersebut memiliki sensitivitas yang tinggi terhadap asam askorbat, yaitu sebesar 0,262 mA.mM-1.cm-2. Sensor dapat mendeteksi asam askorbat secara selektif walaupun terdapat senyawa pengganggu. Selain itu, SPCE/NC-PPy-GO memiliki stabilitas yang sangat baik selama 25 kali perulangan dengan nilai Relative Standar Deviation (RSD) sebesar 2,87%. Hasil tersebut menunjukkan bahwa penambahan modifikan nanoselulosa polipirol-oksida grafena dapat meningkatkan sensitivitas SPCE/NC-PPy-GO untuk deteksi asam askorbat.
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An electrochemical sensor for the detection of ascorbic acid was developed using a nanocellulose–polypyrrole–graphene oxide-modified screen-printed carbon electrode (SPCE). This study was conducted in three main stages: (1) synthesis of nanocellulose and its characterization using a particle size analyzer (PSA); (2) modification of the SPCE with nanocellulose–polypyrrole–graphene oxide (SPCE/NC-PPy-GO) and surface morphology characterization using scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM-EDX); and (3) performance evaluation of the SPCE/NC-PPy-GO sensor via cyclic voltammetry in the potential range of –0.6 V to 0.6 V. PSA results showed that the nanocellulose particles ranged in size from 280 to 420 nm. The SEM results revealed that the surface morphology of SPCE/NC-PPy-GO exhibited irregular graphene oxide sheet-like structures, in contrast to the unmodified SPCE, which displayed more regular sheet-like formations. The SPCE/NC-PPy-GO sensor exhibited a linear response for ascorbic acid detection in the concentration range of 0 to 20 mM, with a detection limit of 0.351 mM. This sensor also exhibits high sensitivity of 0.262 mA·mM⁻¹·cm⁻² toward ascorbic acid. It is capable of selectively detecting ascorbic acid even in the presence of interfering compounds. Furthermore, the SPCE/NC-PPy-GO sensor demonstrates excellent stability over 25 repeated measurements, with a Relative Standard Deviation (RSD) of 2.87%. These findings demonstrate that the modification of nanocellulose, polypyrrole, and graphene oxide enhances the sensitivity and overall performance of the SPCE/NC-PPy-GO sensor for ascorbic acid detection.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Asam askorbat, Oksida grafena, Nanoselulosa, Polipirol, Sensor Elektrokimia. Ascorbic acid, Electrochemical sensor, Graphene Oxide, Nanocellulose, Polypyrrole.
Subjects:	Q Science > QD Chemistry > QD115 Electrochemical analysis
Divisions:	Faculty of Mathematics and Science > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Gabriella Putri Fortuna
Date Deposited:	04 Aug 2025 06:22
Last Modified:	04 Aug 2025 06:22
URI:	http://repository.its.ac.id/id/eprint/126229

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