Journal
TALANTA
Volume 85, Issue 1, Pages 310-316Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2011.03.070
Keywords
Indole-3-acetic acid; Reduced graphene oxide; Poly(safranine T); Electropolymerization; Electrochemical sensor
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Funding
- National Nature Science Foundation of China [90817103, 20805035, 31070885]
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A disposable electrochemical sensor for the determination of indole-3-acetic acid (IAA) based on nanocomposites of reduced graphene oxide (rGO) and poly(safranine T) (PST) was reported. The sensor was prepared by coating a rGO film on a pre-anodized graphite electrode (AGE) through dipping-drying and electrodepositing a uniform PST layer on the rGO film. Scanning electron microscopic (SEM) and infrared spectroscopic (IR) characterizations indicated that PST-rGO formed a rough and crumpled composite film on AGE, which exhibited high sensitive response for the oxidation of IAA with 147-fold enhancement of the current signal compared with bare AGE. The voltammetric current has a good linear relationship with IAA concentration in the range 1.0 x 10(-7)-7.0 x 10(-6) M, with a low detection limit of 5.0 x 10(-8) M. This sensor has been applied to the determination of IAA in the extract samples of several plant leaves and the recoveries varied in the range of 97.71-103.43%. (C) 2011 Elsevier B.V. All rights reserved.
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