Year: 2024 | Month: June | Volume: 11 | Issue: 6 | Pages: 517-523
DOI: https://doi.org/10.52403/ijrr.20240657
Effect of Ammonium Peroxydisulphate (APS) Addition on Polyaniline Nanofiber Microstructure in Interfacial Polymerization Method
Ngurah Ayu Ketut Umiati1, Muchammad Azam1
1Department of Physics, Faculty of Science and Mathematics, Diponegoro University, Semarang Indonesia
Corresponding Author: Ngurah Ayu Ketut Umiati
ABSTRACT
Synthesis of polyaniline nanofiber has been carried out using interfacial polymerization method. Polyaniline nanofiber was a material of interest for biosensors because this material was capable and effective as a mediator for electron transfer in redox and enzymatic reactions. The surface morphology of polyaniline nanofiber was much wider than conventional polyaniline, resulting in the process of molecular diffusion into the polyaniline nanofiber structure being faster and the penetration of molecules deeper, thus having the potential to increase the sensitivity and responsiveness of a sensor.
The interfacial polymerization method used includes a water phase (dopant, initiator and aquadestilate) and an organic phase (toluene as an organic solvent and aniline monomer). Based on the experiments that have been carried out, a relationship was obtained between the molar ratio of aniline and ammonium peroxy disulphate (APS). An indication of the adding effect of initiator can be seen through the morphology and functional groups of the polyaniline produced.
The experimental results showed that the diameter of the polyaniline nanofibers formed was observed to be larger when APS was added as an initiator. The diameter of polyaniline with the percentage of addition APS to aniline of 25%, 33% and 50% is (72.7 ± 0.8) nm, (68.9 ± 0.9) nm and (67.7 ± 1.3) nm, respectively. FTIR results indicate that polyaniline is in a semi-oxidation state and is in the form of emeraldine salt. The main characteristics of polyaniline nanofiber are characterized by the presence of N-H stretching modes (3356-3460 cm-1), C = N (1548-1571 cm-1) and C = C (1482-1489 cm-1) for quinoid and benzenoid rings as well as stretching modes C-N (1207-1363 cm-1) for the benzenoid ring. The degree of polyaniline oxidation increases with increasing quinoid/benzenoid ring ratio.
Keywords: polyaniline nanofiber, ammonium peroxy disulphate, interfacial polymerization
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