Conductivity studies of Polypyrrole/SBA-3 and Polypyrrole/Na-AlSBA-3 composites

J.M. JUAREZ; M.B. GOMEZ COSTA; M.L. MARTÍNEZ; O.A. ANUNZIATA

Sorrento

Congreso; Third International Conference on Multifunctional, Hybrid and Nanomaterials; 2013

Elsevier

New Composites were obtained using Si-SBA-3 and Na-AlSBA-3 synthesized materials. 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. The alumination procedure of SBA-3 was carried out by post-synthesis alumination using sodium aluminate. Pyrrole-saturated hosts were prepared by adsorption of pyrrole 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 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 and Na-AlSBA-3. The spectrum of PY-SBA-3 is more similar to spectrum of pure pyrrole than FTIR spectrum of PY-AlSBA-3 indicating that more amount of pyrrole is adsorbed on SBA-3 host and both hosts are capable to retain pyrrole for the in-situ polymerization. The PPY/SBA-3 composite synthesided using FeCl3 as oxidizing agent shows a high degree of polymerization and a large amount of PPY. The conductivity of the composites varies in the range of 1.10-7 and 1.10-6 S.cm-1mainly according to hosts (SBA-3 or AlSBA-3) and according to the oxidizing agent. These 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 and AlSBA-3), have thus been successfully developed into the channels, generating hybrid composites.