Abstract
We have prepared low-dimensional silver oxide nanoparticles (NPs) by a sono-chemical method using reducing agents in alkaline medium. The resulting NPs were characterized by UV/vis and FT-IR spectroscopy, X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray energy dispersive spectrometry (XEDS), and field-emission scanning electron microscopy (FESEM). They were deposited on a flat-polycrystalline gold electrode (AuE, surface area, 0.0216cm2) to give a sensor with a fast response toward 4-nitrophenol (4-NPh) in liquid phase. The sensor also displays good sensitivity and long-term stability, and enhanced electrochemical performances. The calibration plot is linear (r2=0.9873) over the large concentration range (LDR, 1.0μM to 0.5mM). The sensitivity and detection limit is calculated to ∼4.740μAcm−2mM−1 and ∼0.19μM (signal-to-noise ratio, at a SNR of 3), respectively. We also discuss possible future prospective uses of this metal oxide nanomaterials in terms of chemical sensing.
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