Embedding and electropolymerization of terthiophene derivatives in porous n-type silicon

Electropolymerization of hydrogen bond supramolecular associations between terthiophene‐3‐acetic acid and 4,4′‐bipyridine

“…New components for optoelectronics have been elaborated by incorporating π‐ conjugated monomers into mesoporous silicon matrices. Through hydrogen bonding interactions, supramolecular architectures can be achieved within the pores as already observed with a diacetylenic monomer bearing carboxylic end groups, as well as with a terthiophene carboxylic acid: (2,2′:5′‐2″‐terthiophene‐3′‐acetic acid) (3‐TTAA) . Moreover, the subsequent in situ electrochemical polymerization of the 3‐TTAA monomer molecules embedded in the porous silicon matrix leads to organization of conjugated macromolecules within the pores .…”

“…Through hydrogen bonding interactions, supramolecular architectures can be achieved within the pores as already observed with a diacetylenic monomer bearing carboxylic end groups, as well as with a terthiophene carboxylic acid: (2,2′:5′‐2″‐terthiophene‐3′‐acetic acid) (3‐TTAA) . Moreover, the subsequent in situ electrochemical polymerization of the 3‐TTAA monomer molecules embedded in the porous silicon matrix leads to organization of conjugated macromolecules within the pores . Hydrogen bonding assemblies are also involved in the synthesis of some molecular imprinted polymers (MIPs), which find numerous applications such as in the domain of analytical chemistry .…”

Electro-synthesis and Characterization of Polymer Nanostructures from Terthiophene Using Silica Mesoporous Films as Template

“…Another important advantage to be considered for justifying the use of oligothiophene instead of the monomer, is the significant redox potential decreases required for the electropolymerization. 31 Deposits obtained on Pt«(SiO 2 ) n and Pt electrodes were initially evaluated by their electrochemical response in solutions containing solely the supporting electrolyte. In this case obtainment of stable and reproducible profiles, as a way to prevent over-oxidation of the polymeric material, was searched for, behavior also observed and reported by other authors.…”

“…As Badeva et al pointed out, 31 it must be kept in mind that success of pore filling with the polymeric material is an important factor for the efficient obtention of materials. However, no many reports exist that give evidence concerning the level of pore filling, such as parameters for determining how many cycles of polymerization are needed to homogeneously "fill" the pores forming the template; consequently a study comparing the profile of deposit growth performing one to five polymerization cycles was accomplished.…”

“…The methodology reported by Badeva et al 31 using a one-side polished silicon wafer as electrode substrate, to which an aggressive pre-treatment is made and later etched using a galvanostatic mode, can be compared to the technique used herein, but in this case, the utilized methodology has advantages such as: enables using different electrodic substrates, substrate pre-treatment is unnecessary, no interaction exists between polymeric material and template, thereby facilitating subsequent removal of the latter and, in addition, as previously mentioned, the polymeric nanostructures are normal to the electrode surface.…”