Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 487, Issue -, Pages 370-377Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2016.10.050
Keywords
Reduced graphene oxide; Iron nanoparticles; Ipomoea pes-tigridis leaf extract; Hydrogen peroxide; Non-enzymatic sensor
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Funding
- Ministry of Science and Technology (MOST) of Taiwan (Republic of China)
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A simple and facile green process was used for the synthesis of iron nanoparticles (FeNPs) decorated reduced graphene oxide (rGO) nanocomposite by using Ipomoea pes-tigridis leaf extract as a reducing and stabilizing agent. The as-prepared rGO/FeNPs nanocomposite was characterized by transmission electron microscopy, X-ray spectroscopy and Fourier transform infrared spectroscopy. The nanocomposite was further modified on the glassy carbon electrode and used for non-enzymatic sensing of hydrogen peroxide (H2O2). Cyclic voltammetry results reveal that rGO/FeNPs nanocomposite has excellent electro-reduction behavior to H2O2 when compared to the response of FeNPs and rGO modified electrodes. Furthermore, the nanocomposite modified electrode shows 9 and 6 folds enhanced reduction current response to H2O2 than that of rGO and FeNPs modified electrodes. Amperometric method was further used to quantify the H202 using rGO/FeNPs nanocomposite, and the response was linear over the concentration ranging from 0.1 mu M to 2.15 mM. The detection limit and sensitivity of the sensor were estimated as 0.056 mu M and 0.2085 mu A mu M-1 cm(-2), respectively. The fabricated sensor also utilized for detection of H202 in the presence of potentially active interfering species, and found high selectivity towards H2O2. (C) 2016 Elsevier Inc. All rights reserved.
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