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Abstract
Silver chloride@polyaniline (PANI) core-shell (AgCl@PANI) nanocomposites were synthesized
in the presence of polyvinylpyrrolidone (PVP). The obtained AgCl@PANI nanocomposites
could be easily dispersed in aqueous media, which overcame the processible issues
of PANI. Moreover, the nanocomposites showed excellent electrochemical behavior at
pH neutral environment, and had inhibitive effect on oxidation of ascorbic acid. Fourier
transform infrared spectrophotometry (FTIR) confirmed the existence of PVP in the
nanocomposites. The C=O group of PVP is easy to form hydrogen bonding with the hydroxyl
group of ascorbic acid, which can prevent ascorbic acid from oxidization. A selective
dopamine biosensor was constructed based on the particular characteristic of the AgCl@PANI
nanocomposites by the simple drop-coating. The biosensor could detect dopamine at
its very low concentration in the presence of 5000 time concentration of ascorbic
acid at neutral environment.