Gold nanoparticles decorated mesoporous silica microspheres: A proficient electrochemical sensing scaffold for hydrazine and nitrobenzene

作者：Gupta Rupali; Rastogi Pankaj Kumar; Ganesan Vellaichamy; Yadav Dharmendra Kumar; Sonkar Piyush Kumar

来源：Sensors and Actuators B: Chemical , 2017, 239: 970-978.

DOI：10.1016/j.snb.2016.08.117

• Gold nanoparticles
• Mesoporous silica microspheres
• Electrochemical sensing scaffold
• Hydrazine
• Nitrobenzene

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.

• 出版日期2017-2