Journal
BIOSENSORS & BIOELECTRONICS
Volume 26, Issue 6, Pages 3063-3067Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2010.11.044
Keywords
Au/PANI; Nanocomposites; SERS; Nanosensors; Hg2+ detection
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Funding
- National Science Foundation of China [91022032, 31070730, 20871001, 50973001]
- Research Foundation for the Doctoral Program of Higher Education of China [20070357002]
- Anhui Provincial Education Department [ZD2007004-1]
- Key Laboratory of Functional Material of Inorganic Chemistry and Key Laboratory of Environment-friendly Polymer Materials and Inorganic Materials of Anhui Province
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The monodisperse, uniform dandelion-like Au/polyaniline (PANI) composite nanospheres were synthesized by a simple one-step process without any additives or templates. The nanospheres are really composed of many short nanorods and the average diameter of whole nanospheres is about 180 nm. The morphology of Au/PANI composites could be controlled by adjusting the molar ratio of HAuCl4 to aniline. The prepared nanocomposite is developed as a wonderful sensor for the detection of Hg2+ ions, which is based upon the Raman intensity response of PANI to Hg2+ ions. Results from the morphology-dependent sensitivity investigations show that the dandelion-like nanospheres have an ultra sensitive response (as low as 10(-11) M) compared with other morphologies. The nanosensor also exhibits good reproducibility and greater selectivity for Hg2+ ions than the other heavy metal ions. And the mechanism was proposed. The proposed nanosensors can be applied for highly sensitive and selective chemical analysis in a variety of environmental detection. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
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