Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 239, Issue -, Pages 970-978Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.08.117
Keywords
Gold nanoparticles; Mesoporous silica microspheres; Electrochemical sensing scaffold; Hydrazine; Nitrobenzene
Funding
- CSIR [01(2708)/13/EMR-II]
- UGC, New Delhi [42-271/2013]
- UGC
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In this report, an electrochemical sensing scaffold (ESS) for hydrazine (HZ) and nitrobenzene (NB) have been developed based on gold nanoparticles decorated mesoporous silica microspheres (Au-MSM) modified glassy carbon (GC) electrode (represented as GC/Au-MSM). The presence and formation of gold nanoparticles in Au-MSM composite material is verified by X-ray diffraction, X-ray photoelectron spectroscopy, energy dispersive X-ray spectroscopy, scanning electron microscopy, transmission electron microscopy and by electrochemical methods. The textural and thermal properties are studied by nitrogen adsorption-desorption and thermogravimetric analysis, respectively. The electrocatalytic sensing behavior of GC/Au-MSM towards HZ and NB are investigated in detail employing various electrochemical techniques. Amperometry measurements as a function of HZ concentration exhibit two linear calibration ranges of 5.0 mu M to 0.5 mM and 0.518.0 mM. Similarly, the differential pulse voltammetry measurements as a function of NB concentration show a linear calibration range of 0.1 mu M to 2.5 mM. The limit of detection is evaluated to be 0.11 mu M and 15.0 nM for HZ and NB, respectively. The kinetic parameters for HZ oxidation and NB reduction are discussed using chronoamperometry. The proposed GC/Au-MSM ESS shows good selectivity over potent interferences and applied to determine HZ and NB in various water samples. (C) 2016 Elsevier B.V. All rights reserved.
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