Pradana, Mitchell Steffen Yudha (2026) Studi Awal Aplikasi Nanofiber Polyurethane (PU)/Multi-walled Carbon Nanotubes (MWCNT) dan Nanofiber Polyurethane (PU)/Reduced Graphene Oxide (rGO) Sebagai Kandidat Sensor Akustik Piezoresistif. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Perkembangan sensor fleksibel mendorong pemanfaatan material nanofiber sebagai elemen sensor yang ringan, tipis, dan mampu merespons rangsangan mekanik kecil, termasuk gelombang akustik. Polyurethane (PU) memiliki elastisitas dan kemampuan deformasi yang baik, tetapi sifat listriknya masih perlu ditingkatkan agar dapat digunakan sebagai elemen sensor berbasis perubahan resistansi. Penelitian ini bertujuan untuk menganalisis respons relatif kandidat sensor terhadap variasi frekuensi suara, mengetahui sensitivitas sensor berdasarkan perubahan resistansi terhadap perubahan frekuensi, serta mengevaluasi pengaruh jenis filler terhadap performa sensor akustik piezoresistif. Nanofiber PU difabrikasi menggunakan metode electrospinning, kemudian dimodifikasi melalui proses impregnasi menggunakan reduced graphene oxide (rGO) dan multi-walled carbon nanotubes (MWCNT) dengan variasi waktu perendaman 2, 5, dan 8 jam. Pengujian akustik dilakukan menggunakan speaker Easy Art dan Harman Kardon AD68 pada frekuensi 125–4000 Hz dengan variasi jarak 0 dan 1 cm. Respons sensor dianalisis berdasarkan respons relatif, sedangkan sensitivitas dihitung dari perbandingan perubahan resistansi sebagai output terhadap perubahan frekuensi sebagai input. Hasil penelitian menunjukkan bahwa sampel PU/rGO dan PU/MWCNT mampu merespons paparan suara melalui perubahan resistansi. Pada pengujian sampel C jarak 0 cm menggunakan speaker S1, respons relatif C2 meningkat dari 1,09% pada 125 Hz menjadi 7,38% pada 2000 Hz, C5 mencapai respons maksimum 6,11% pada 1000 Hz, sedangkan C8 berada pada rentang 0–2,11%. Sensitivitas tertinggi pada kondisi tersebut diperoleh C2 sebesar 0,08421 kΩ/Hz pada 125 Hz. Hasil osiloskop menunjukkan C5 menghasilkan tegangan keluaran tertinggi sebesar 0,789 V, lebih besar dibandingkan C8 sebesar 0,207 V, C2 sekitar 0,049–0,052 V, serta R5 dan R8 sebesar 0,005–0,006 V. Dengan demikian, PU/MWCNT, terutama C5, lebih potensial sebagai kandidat sensor akustik fleksibel dari sisi keterbacaan sinyal listrik, meskipun optimasi rangkaian dan pengujian berulang masih diperlukan.
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Advances in flexible sensors have driven the use of nanofiber materials as sensor elements that are lightweight, thin, and capable of responding to small mechanical stimuli, including acoustic waves. Polyurethane (PU) has good elasticity and deformability, but its electrical properties still need to be improved for it to be used as a resistance-change-based sensor element. This study aims to analyze the relative response of sensor candidates to variations in sound frequency, determine the sensitivity of the sensors based on changes in resistance in response to frequency changes, and evaluate the effect of filler type on the performance of piezoresistive acoustic sensors. PU nanofibers were fabricated using the electrospinning method and then modified through an impregnation process using reduced graphene oxide (rGO) and multi-walled carbon nanotubes (MWCNT) with soaking times of 2, 5, and 8 hours. Acoustic testing was conducted using Easy Art and Harman Kardon AD68 speakers at frequencies ranging from 125 to 4000 Hz with distances of 0 and 1 cm. Sensor response was analyzed based on relative response, while sensitivity was calculated from the ratio of changes in resistance (output) to changes in frequency (input). The results showed that the PU/rGO and PU/MWCNT samples were able to respond to sound exposure through changes in resistance. In the testing of sample C at a distance of 0 cm using speaker S1, the relative response of C2 increased from 1.09% at 125 Hz to 7.38% at 2000 Hz; C5 reached a maximum response of 6.11% at 1000 Hz, while C8 ranged from 0 to 2.11%. The highest sensitivity under these conditions was achieved by C2 at 0.08421 kΩ/Hz at 125 Hz. Oscilloscope results showed that C5 produced the highest output voltage of 0.789 V, which was greater than that of C8 (0.207 V), C2 (approximately 0.049–0.052 V), and R5 and R8 (0.005–0.006 V). Thus, PU/MWCNT, particularly C5, shows greater potential as a candidate for a flexible acoustic sensor in terms of electrical signal readability, although circuit optimization and repeated testing are still required
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Electrospinning, MWCNT, Nanofiber, Piezoresistif, Polyurethane, rGO, Respons relatif, Sensor akustik,Electrospinning, MWCNT, Nanofiber, Piezoresistive, Polyurethane, rGO, Relative response, Acoustic sensor |
| Subjects: | Q Science > QC Physics > QC1 Dielectrics Q Science > QC Physics > QC100.5 Measuring instruments (General) Q Science > QC Physics > QC221 Acoustics. Sound Q Science > QC Physics > QC585 Dielectrics Q Science > QC Physics > QC610.3 Electric conductivity Q Science > QC Physics > QC665.E38 Electric fields. |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Mitchell Steffen Yudha Pradana |
| Date Deposited: | 24 Jul 2026 06:10 |
| Last Modified: | 24 Jul 2026 06:10 |
| URI: | http://repository.its.ac.id/id/eprint/137070 |
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