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. Synthetic Metals, 162 (5-6). pp. 466-476. ISSN 0379-6779
|
Text
Synthesis of silica polypyrrole core shell nanocomposite using in situ γ.pdf Download (207kB) | Preview |
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 29Si 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 (FeCl3·6H2O and (NH4)2S2O8).
| Item Type: | Article |
|---|---|
| Keyword: | Modified silica , Polypyrrole , Core–shell , Nanocomposite |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Department: | FACULTY > Faculty of Engineering |
| Depositing User: | NORAINI LABUK - |
| Date Deposited: | 13 Jun 2018 08:24 |
| Last Modified: | 13 Jun 2018 08:24 |
| URI: | https://eprints.ums.edu.my/id/eprint/20263 |
Actions (login required)
 |
View Item |