| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 600898 | Colloids and Surfaces B: Biointerfaces | 2012 | 5 Pages |
Chitosan gold nanocomposite (CGNC) was synthesized in a single step process and the pH dependent properties of the composite were investigated. The structure of the polymer was pH dependent and gelation of the polymer observed at pH 4–5. Transmission electron microscopy (TEM) analysis showed that the distribution of gold nanoparticles within unit area varied with the gelation of the polymer, without affecting the size of the nanoparticles. The resulting CGNC system was explored for its use as a sensor for the detection of lead. It was found that lead could be detected at a concentration of 1 μM by absorption spectroscopy. The CGNC was electrodeposited on a gold electrode and the deposited film was used for the detection of lead using cyclic voltammetry. Lead could be detected with a detection limit of 10 μM. The fabrication reproducibility for four sensor electrodes showed a relative standard deviation (RSD) of 2.09% for the determination of 1 mM lead nitrate. The developed sensor system showed high reproducibility, stability and satisfactory selectivity.
Graphical abstractThe electrodeposited chitosan–gold nanocomposite film act as a sensitive and selective electrochemical sensor surface for lead with a detection limit of 10−5 M.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Chitosan–gold nanocomposite (CGNC) has been synthesized. ► CGNC exhibit pH dependent sol–gel transition. ► Sol–gel transition property of CGNC is used for the sensitive detection of lead. ► A sensitive and selective electrochemical sensor for lead using CGNC was developed.
