Chin, Seik Yee (2018) Synthesis And Characterization Of Polyaniline, Graphene And Graphene Polyaniline Nanocomposites. Masters thesis, Universiti Sains Malaysia.
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Abstract
Kebelakangan ini, nanokomposit dengan grafin dan polimer konduktif telah menarik perhatian kerana kekonduksian elektriknya yang unggul. Tujuan utama kajian ini adalah untuk meningkatkan kekonduksian elektrik Polianilin (PANI) dengan penambahan grafin yang difungsikan. Objektif bagi kajian ini dibahagikan kepada dua bahagian. Dalam bahagian pertama, kesan penggunaan natrium dodekil benzenesulfonat (SDBS) sebagai surfaktan dan kaedah berbeza untuk menghasilkan PANI (konvensional fasa tunggal dan pempolimeran antara muka) telah dikaji. Dalam bahagian kedua, grafin telah dihasilkan melalui pengelupasan elektrokimia grafit dengan menggunakan voltan electrokimia yang berbeze iaitu 5V dan 10V. Grafin/PANI-SDBS nanokomposit telah dihasilkan dengan melalui satu-langkah pempolimeran antara muka yang mudah dengan kandungan grafin yang berbeza. Keputusan menunjukkan bahawa nanogentian PANI yang seragam dengan diameter yang kecil (55 nm) dapat dihasilkan dengan menggunakan pempolimeran antara muka. Penambahan SDBS semasa pempolimeran antara muka PANI berjaya mengurangkan aglomerasi nanogentian PANI. Voltan yang rendah, 5V dapat menghasilkan grafin yang nipis dengan kecacatan yang rendah (ID/IG=0.36), meningkatkan kestabilan terma serta kekonduksian elektrik yang tinggi iaitu 2.53 ×10-1 S/cm. Kajian morfologi menggunakan FESEM dan HRTEM menunjukkan bahawa nanogentian PANI cenderung untuk menyalut di atas permukaan grafin. Nanokomposit yang mengandungi 5% berat badan grafin telah menunjukkan kekonduksian elektrik yang paling tinggi iaitu 2.53 ×10-1 S/cm, dengan empat kali ganda lebih tinggi daripada PANI (9.99 ×10-6 S/cm). Kestabilan terma dan kekonduksian elektrik nanokomposit telah meningkat bertambahnya kandungan grafin. _______________________________________________________________________________________________________ Recently, nanocomposites with graphene and conducting polymers have attracted considerable attention because of their superior electrical conductivity. The main aim of this study is to enhance electrical conductivity of polyaniline (PANI) by addition of functionalized graphene. The objectives of the present study are divided into two parts. In the first part, effect of using sodium dodecylbenzenesulfonate (SDBS) as surfactant and two different methods to synthesize PANI (conventional single-phase and interfacial polymerization) are considered in the study. In the second part, graphene were synthesized through electrochemical exfoliation of graphite with different electrochemical applied bias of 5V and 10V. The graphene/PANI-SDBS nanocomposites have been synthesized through a simple one-step interfacial polymerization by varying the amount of graphene content. Results indicate that more uniform with smaller diameter (55 nm) of PANI nanofibers are produced using interfacial polymerization. The growth of PANI nanofibers into agglomeration was successfully suppressed with the addition of SDBS during the interfacial polymerization of PANI. The low applied bias, 5V yields thin graphene sheets with relatively low defect (ID/IG=0.36), enhanced thermal stability as well as show high electrical conductivity of 2.53 ×10-1 S/cm. The morphological analysis via field emission scanning (FESEM) and high resolution transmission electron microscopy (HRTEM) showed that PANI nanofibers tend to coat on the surfaces of graphene sheets. The nanocomposites containing 5 wt% graphene content exhibit the highest electrical conductivity of 2.53 ×10-1 S/cm, which is four orders of magnitude higher than that of PANI (9.99 ×10-6S/cm). The thermal stability and electrical conductivity of nanocomposites was found to be improved with the increased in graphene content.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | Full text is available at http://irplus.eng.usm.my:8080/ir_plus/institutionalPublicationPublicView.action?institutionalItemId=4615 |
| Subjects: | T Technology T Technology > TN Mining Engineering. Metallurgy > TN263-271 Mineral deposits. Metallic ore deposits. Prospecting |
| Divisions: | Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Bahan & Sumber Mineral (School of Material & Mineral Resource Engineering) > Thesis |
| Depositing User: | Mr Mohd Jasnizam Mohd Salleh |
| Date Deposited: | 06 May 2019 04:33 |
| Last Modified: | 06 May 2019 04:33 |
| URI: | http://eprints.usm.my/id/eprint/44282 |
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