Studi Sifat Listrik dan Elektrokimia Komposit PANI/ZrO2 Polimorfi Berbasis Pasir Zirkon Alam

Munaji, Munaji (2023) Studi Sifat Listrik dan Elektrokimia Komposit PANI/ZrO2 Polimorfi Berbasis Pasir Zirkon Alam. Doctoral thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada penelitian ini dilakukan sintesis dan karakterisasi komposit PANI/ZrO2 polimorfi. ZrO2 amorf (a-ZrO2), tetragonal (t-ZrO2), dan campuran tetragonal-monoklinik (tm-ZrO2) disintesis dari pasir zirkon, sedangkan ZrO2 monklinik (m-ZrO2) didapatkan dari bahan komersial. Sintesis zirkonia dari bahan dasar pasir zirkon dilakukan menggunakan metode alkali fusion. Sedangkan sintesis PANI dan komposit PANI/ZrO2 menggunakan metode polimerisasi in situ. Analisis fasa dan struktur ZrO2 menggunakan difraksi sinar-X dan FTIR. Morfologi ZrO2 dan komposit PANI/ZrO2 dikarakterisasi menggunakan SEM. Terakhir, pengujian sifat listrik dan elektrokimia dari komposit PANI/ZrO2 dilakukan menggunakan electrochemical impedance spectroscopy (EIS).
Hasil pengujian sifat listrik menunjukkan bahwa komposit PANI/ZrO2 polimorfi memiliki konstanta dielektrik dan konduktifitas lebih rendah dibandingkan dengan PANI. Nilai konstanta dielektrik menurun dengan urutan: m-ZrO2, a-ZrO2, t-ZrO2 dan tm-ZrO2. Konduktivitas AC menurun dengan urutan a-ZrO2, m-ZrO2, t-ZrO2 dan tm-ZrO2.
Hasil pengujian sifat elektrokimia dengan EIS menunjukkan bahwa lapisan cat dengan campuran bahan komposit PANI/t-ZrO2 dan PANI/tm-ZrO2 memiliki impedansi maksimum pada frekuensi rendah yang lebih tinggi dibandingkan dengan PANI maupun PANI/a-ZrO2 dan PANI/m-ZrO2. Nilai besaran ini sebagai indikasi awal ketahanan korosi suatu lapisan. Analisis lebih lanjut dengan pencocokan rangkaian listrik ekuivalen menunjukkan bahwa lapisan cat-PANI/ZrO2 mengalami permulaan kerusakan lebih lambat dibandingkan dengan lapisan cat saja. Sifat perlindungan korosi yang lebih baik ini diduga merupakan efek dari struktur fluorite ZrO2 yang memiliki efek penyangga oksigen dan bersifat katalis terhadap perubahan PANI dari basa emeraldin menjadi garam emeraldin. Selain itu aspek geometri filler yang cenderung berbentuk lonjong dan berperan menghasilkan lintasan berliku pada lapisan sehingga menghambat pergerakan ion korosif.

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In this research, synthesis and characterization of polymorphic PANI/ZrO2 composites were carried out. Amorphous ZrO2 (a-ZrO2), tetragonal (t-ZrO2), and mixed tetragonal-monoclinic (tm-ZrO2) were synthesized from zircon sand, while monoclinic ZrO2 (m-ZrO2) was obtained from commercial materials. Synthesis of zirconia from zircon sand as a base material is carried out using the alkaline fusion method. Meanwhile, the PANI and the PANI/ZrO2 composite synthesis used the in situ polymerization method. Phase and structural analysis of the synthesized ZrO2 using X-ray diffraction and FTIR. The morphology of ZrO2 and the PANI/ZrO2 composite was characterized using SEM. Finally, the EIS test was conducted to test the electrochemical properties of the PANI/ZrO2 composite.
The results of the electrical properties test showed that the polymorphic PANI/ZrO2 composite had a lower dielectric constant and conductivity than PANI. The value of the dielectric constant decreases in the order: m-ZrO2, a-ZrO2, t-ZrO2 and tm-ZrO2. AC conductivity decreases with the order of a-ZrO2, m-ZrO2, t-ZrO2 and tm-ZrO2.
The results of the electrochemical properties test with EIS showed that the paint coating with a mixture of PANI/t-ZrO2 and PANI/tm-ZrO2 composites had a higher maximum impedance at low frequency compared to PANI or PANI/a-ZrO2 and PANI/m-ZrO2. The value of this quantity is an initial indication of the corrosion resistance of a coating. Further analysis by matching the equivalent electrical circuit shows that the paint+PANI/ZrO2 layer experiences slower onset of damage compared to the paint layer alone. This better corrosion protection property is thought to be the effect of the ZrO2 fluorite structure, which has an oxygen buffering effect and is a catalyst for the change of PANI from an emeraldine base to an emeraldine salt. In addition, the geometric aspect of the filler, which tends to be oval, plays a role in producing a winding path in the coating, thereby inhibiting the movement of corrosive ions.

Item Type:	Thesis (Doctoral)
Uncontrolled Keywords:	ZrO2-polimorfi, PANI/ZrO2, sifat listrik, sifat elektrokimia ZrO2-polymorphy, electrical properties, electrochemical properties
Subjects:	Q Science > QC Physics Q Science > QC Physics > QC173.4.C63 Composite materials Q Science > QC Physics > QC610.3 Electric conductivity T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials T Technology > TA Engineering (General). Civil engineering (General) > TA467 Iron and Steel Corrosion and protection against corrosion
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45001-(S3) PhD Thesis
Depositing User:	Munaji Munaji
Date Deposited:	24 Aug 2023 01:13
Last Modified:	24 Aug 2023 01:13
URI:	http://repository.its.ac.id/id/eprint/104846

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