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Preparation of titanate nanotubes-polyaniline-gold nanoparticle composite and its bioelectrochemistry study
Pages: 107-111
Year: Issue:  1
Journal: Chemical Research

Keyword:  hydrothermal methodoxidation polymerization methodternary compositehorse-radish peroxidaseelectrochemical performance;
Abstract: A ternary composite consisting of titanate nanotubes (TNTs) ,polyaniline (PANI) and gold nanoparticles (GNPs) was prepared for the first time and applied for the fabrication of a biosensor using horseradish peroxidase (HRP) as model enzyme .TNTs were initially synthe‐sized from TiO 2 nanoparticles using a hydrothermal method .Aniline was then polymerized on TNTs through an oxidation polymerization method .The GNPs were eventually deposited on PANI to form a ternary composite ,in which PANI served as a cross linker between TNTs and GNPs to strengthen their contact .Different spectroscopic and microscopic techniques have con‐firmed the successful formation of the ternary composite .The ternary composite was then used for the immobilization of horseradish peroxidase (HRP) on electrode surface .The voltammet‐ric results demonstrated that the direct electron transfer of HRP had been achieved at both TNTs‐PANI and TNTs‐PANI‐GNPs modified electrodes and the catalytic reduction current at the later towards H 2 O2 has enhanced ~ 74 .9% compared to that at the former .The excellent electrochemical performance of the modified electrode can be ascribed to the superior synergis ‐tic properties of TNTs ,PANI and GNPs .
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