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Preparation of Polyaniline/Au 0 Nanocomposites Modified Electrode and Application for Hydrazine Detection
Author(s) -
Xin Meng,
Lin Hailian,
Yang Jianmao,
Chen Mengni,
Ma. Xiaoyu,
Liu Jianyun
Publication year - 2014
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201400299
Subject(s) - polyaniline , x ray photoelectron spectroscopy , cyclic voltammetry , materials science , nanocomposite , redox , analytical chemistry (journal) , detection limit , dielectric spectroscopy , electrochemistry , nuclear chemistry , electrode , spectroscopy , hydrazine (antidepressant) , chemistry , nanotechnology , chemical engineering , polymer , organic chemistry , composite material , physics , chromatography , quantum mechanics , engineering , polymerization , metallurgy
The PANI/Au 0 nanocomposite films were successfully prepared on glassy carbon electrode (GCE) using a simple alternate adsorption of water soluble polyaniline (PANI) and ${{\rm AuCl}{{- \hfill \atop 4\hfill}}}$ . The growth of the films was monitored by UVVis spectroscopy and cyclic voltammetry. ${{\rm AuCl}{{- \hfill \atop 4\hfill}}}$ was in‐situ reduced in the film due to the redox interaction between PANI and ${{\rm AuCl}{{- \hfill \atop 4\hfill}}}$ , without extra reductant. The ultrafine Au nanoparticles with the size of 2–4 nm were observed by transmission electron spectroscopy. The existence of zero‐valence Au nanocrystals (Au 0 ) was confirmed by X‐ray photoelectron spectroscopy, X‐ray Diffraction and FTIR. PANI in the nano‐structured PANI/Au 0 composite films displayed a good redox activity in neutral pH solution. The as‐obtained PANI/Au 0 /GCE presents an excellent electrocatalytic activity to hydrazine oxidation, and the mechanism of hydrazine oxidation was studied. The calibration curve on (PANI/Au 0 ) 5 /GCE was obtained in the concentration range of 0.01–6 mM with the detection limit of 1 µM ( S / N >3). The modified electrode has a great potential for hydrazine sensor application due to its ease of fabrication, good reproducibility and high stability.