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

Coswald Stephen Sipaut @ Mohd Nasri and Ismail Ab Rahman and Mohammad Jafarzadeh (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 situmodified 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 -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 thatimproved 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: SCHOOL > School of Engineering and Information Technology
Depositing User: ADMIN ADMIN
Date Deposited: 17 Nov 2016 11:18
Last Modified: 31 Aug 2021 20:02
URI: https://eprints.ums.edu.my/id/eprint/14941

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