Title of article :
Synthesis of silica–polypyrrole core–shell nanocomposite using in situ γ-aminopropyltriethoxysilane (APTES)-modified nanosilica
Author/Authors :
Jafarzadeh، نويسنده , , Mohammad and Ab Rahman، نويسنده , , Ismail and Sipaut، نويسنده , , Coswald Stephen، نويسنده ,
Issue Information :
دوماهنامه با شماره پیاپی سال 2012
Pages :
11
From page :
466
To page :
476
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).
Keywords :
Modified silica , Polypyrrole , Core–shell , Nanocomposite
Journal title :
Synthetic Metals
Serial Year :
2012
Journal title :
Synthetic Metals
Record number :
2088855
Link To Document :
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