Synthesis and characterization of Polypyrrole/SBA-3 using different oxidizing agents

J.M. JUÁREZ; M.B. GÓMEZ COSTA; O.A. ANUNZIATA

Xiamen

Congreso; 3rd International Colloids Conference - Colloids and Energy; 2013

Elsevier

New Composites were obtained using Si-SBA-3 synthesized materials using two different oxidizers agents ammonium persulfate and ferric chloride.Silica mesoporous materials were obtained following the sol-gel method by hydrolysis of tetraethylorthosilicate (TEOS) at room temperature, in an aqueous acidic solution, using cetyltrimethylammonium bromide (CTAB) as surfactant.Pyrrole-saturated hosts were prepared by adsorption of pyrrole (PPY) into the mesoporous materials. The adsorption/desorption of pyrrole was studied by FTIR. Molecules of pyrrole would be adsorbed through aromatic ring and anchor sites of the host. The polymerization technique to obtain polypyrrole (PPY), was performed by oxidative way using different oxidizing agents, ammonium persulfate and ferric chloride, after pyrrole adsorption on both hosts. TG, FTIR, BET, XRD, SEM and TEM were used to characterize the resulting composites. The characterization of PPY-composites shows that it is possible to obtain pyrrole in-situ polymerization within the Si-SBA-3.The technique of pyrrole adsorption was effective. The FTIR spectrum of PY-SBA-3 is similar to spectrum of pure pyrrole indicating that an amount of pyrrole is adsorbed on SBA-3 host and the host is capable to retain pyrrole for the in-situ polymerization.The PPY/SBA-3 composite synthesized using ferric chloride as oxidizing agent shows a high degree of polymerization and a large amount of polypyrrole (PPY).The conductivity of the composites was 3.37 10-6 and 1.12 10-6 S.cm-1 for the composite synthesized with ferric chloride and ammonium persulfate respectively.Generally, it is assumed that conductivity should be higher in higher degrees of crystallinity and better alignment of the chains. The PPY included in FePPY/SBA-3 is more conducting and possibly more doped.Both composites offer numerous desirable properties with a high potential for successful application in the electronic field for developing, for example, an electronic device at nanometric scale. Organic molecular wires, together with inorganic reservoirs (SBA-3), have been successfully developed into the channels, generating hybrid nanocomposites.