Fabrication of hydrazine sensor based on silica-coated Fe 2 O 3 magnetic nanoparticles prepared by a rapid microwave irradiation method

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Journal of Alloys and Compounds, ISSN: 0925-8388, Vol: 698, Page: 921-929

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Hashi Akhter; Jannatul Murshed; Md. A. Rashed; Yoshifumi Oshima; Yuki Nagao; Mohammed M. Rahman; Abdullah M. Asiri; M.A. Hasnat; Md. Nizam Uddin; Iqbal Ahmed Siddiquey
Elsevier BV
Engineering; Materials Science
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A facile, efficient and rapid method for fabrication of silica-coated Fe 2 O 3 magnetic nanoparticles (NPs) by a microwave (MW) irradiation method is reported. The homogeneous heating produced by the MW irradiation is the key to attaining the effective and uniform coating on Fe 2 O 3 magnetic nanoparticles (NPs) in water-ethanol solution. HRTEM images confirmed the successful formation of uniform silica shells around the Fe 2 O 3 NPs surface whereas FT-IR data show the structural differences between non-coated and silica-coated Fe 2 O 3 NPs. These uniformly coated Fe 2 O 3 NPs showed superior dispersibility than the bare Fe 2 O 3 NPs as confirmed by the zeta potential measurements. For potential chemical sensor development, silica-coated Fe 2 O 3 magnetic NPs were deposited onto a flat glassy carbon electrode (GCE, surface area, 0.0316 cm 2 ) to give a sensor with a fast response against selective hydrazine in phosphate buffer phase. Hydrazine sensor also exhibits a good sensitivity with long-term stability and enhanced electrochemical performances. The calibration plot is linear (r 2 : 0.9911) over the 0.2 nM to 2.0 mM hydrazine concentration ranges. The sensitivity and detection limit are ∼12.658 μAmM −1 cm −2 and 76.0 pM (signal-to-noise ratio, at a SNR of 3) respectively. It is also commenced a promising future sensitive sensor development using silica-coated Fe 2 O 3 magnetic NPs by I-V method for the important applications of hazardous and carcinogenic compounds in environmental fields.