Mohammad Jafarzadeh and Ismail Ab Rahman and Coswald Stephen Sipaut @ Mohd Nasri (2012) Synthesis of silica-polypyrrole core-shell nanocomposite using in situ γ-aminopropyltriethoxysilane (APTES)-modified nanosilica. Diabetes Research and Clinical Practice, 96 (1). p. 90. ISSN 0168-8227
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Abstract
A well dispersed core-shell, silica-polypyrrole nanocomposites, with particle size of ∼70 nm were synthesized using a new approach. The polypyrrole conducting layer was deposited directly on the in situ-modified silica via an oxidative polymerization without the utilizing a steric stabilizer. The composites were characterized by TEM, ¹³C and ²�Si NMR, thermogravimetric analysis (TGA), photoluminescence (PL) and UV-vis. The in situ γ-aminopropyltriethoxysilane (APTES)-modified silica has shown a higher deposited polypyrrole which led to effective polymerization and higher conductivity compared to the unmodified silica (2.26 × S cm¯¹ vs. 3.94 × 10 -5 S cm ¯¹). This might be due to the presence of an aminopropyl group on the silica surface that improved compatibility and effective interactions. The existence of a core-shell system has been proven by TEM, through energy spectroscopic imaging (ESI) and PL analysis. The particle sizes and conductivity of the nanocomposites were found to be dependent on the mode of preparation, deposition time and the type of oxidants (FeCl ₃·6H ₂O and (NH ₄) ₂S ₂O ₈).
| Item Type: | Article |
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| Keyword: | Core-shell, Modified silica, Nanocomposite, Polypyrrole, Aminopropyl groups, Aminopropyltriethoxysilane, Conducting layers, Core-shell, Core-shell nanocomposites, Deposition time, Effective interactions, In-situ, Modified silica, Nano-silica, Oxidative polymerization, Polypyrrole (PPy), Silica surface, Spectroscopic imaging, Steric stabilizers, Well-dispersed, Nanocomposites, Polymerization, Polypyrroles, Shells (structures), Silicon compounds, Thermogravimetric analysis, Silica |
| Department: | SCHOOL > School of Engineering and Information Technology |
| Depositing User: | ADMIN ADMIN |
| Date Deposited: | 14 Jan 2013 16:12 |
| Last Modified: | 11 Oct 2017 10:16 |
| URI: | https://eprints.ums.edu.my/id/eprint/5703 |
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