Preparation and Characterization of Polyindole Composites Nanowires onto SBA-15 and AlSBA-15

JULIANA M. JUÁREZ; MARCOS B. GÓMEZ COSTA; OSCAR A. ANUNZIATA

Konya

Congreso; 3rd International Semiconductor Science & Technology Conference (ISSTC 2016); 2016

ISSTC

Nanostructured silicate SBA-15 and aluminosilicate AlSBA-15 were synthesized in order to prepare polyindole composites. The Silica mesoporous materials were prepared by sol?gel method using the triblock copolymer, P123 as the surfactant and TEOS as the silice source. In order to obtain AlSBA-15 we used post-synthesis alumination using sodium-aluminate at room temperature [2]. Polyindole/host composites were prepared by an oxidative in situ polymerization of pre-adsorbed indole, employing Cl3Fe as oxidant. TG, FTIR, BET, XRD, SEM and TEM were used to characterize the resulting composites.From the structural point of view, the conductive polymers are polymeric with double bonds conjugated in their main chain, being polyheterocycles one of the groups most characteristic of this type of materials. In this work show the synthesis and characterization of new composites using nanowires of conducting polymers included in nanostructured hosts, based polyindole obtained by in-situ oxidative polymerization of corresponding pre-adsorbed monomers onto de hosts, producing hybrid composites with interesting conducting properties.These studies show that after polymerization, the porous structures of the materials are preserved and the polyindole is found within the porous channels.XRD patterns of the PInd-composites indicate that the hexagonal-ordered structure of hosts was persistent, after the in-situ polymerization procedure. While the composite area is significantly smaller than that for hosts, its characteristic structure is maintained after the PInd nanowire is within the host. (SBA-15: 1040 m2/g; PInd-SBA-15: 550 m2/g; Al-SBA-15: 960 m2/g; PInd-AlSBA-15: 736 m2/g). TEM of composites images (Figure 1) show narrow pore size distribution indicating that the host structure is retained after the inclusion of the polymer. Also images show that no bulk polymers clusters is synthesized outside the channels hosts and can observe the filling of pores with PInd. The composites have an electrical conductivity range between higher than the pure polyindole chemically synthesized (Figure 2), close to the electrical conductivity of pure polymer electrochemically synthesized, and lower than the pure polymer chemically synthesized.