Synthesis of silica polypyrrole core shell nanocomposite using in situ γ-aminopropyltriethoxysilane (APTES)-modified nanosilica

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

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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 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
Uncontrolled Keywords: Modified silica , Polypyrrole , Core–shell , Nanocomposite
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: FACULTY > Faculty of Engineering
Depositing User: Noraini
Date Deposited: 13 Jun 2018 00:24
Last Modified: 13 Jun 2018 00:24
URI: http://eprints.ums.edu.my/id/eprint/20263

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