Abstract
We have prepared calcined α-Fe2O3 codoped SnO2 nanocubes (NCs) by a hydrothermal method using reducing agents in alkaline medium. The codoped NCs were characterized by UV/vis, FT-IR, and Raman spectroscopy, powder X-ray diffraction (XRD), and field-emission scanning electron microscopy (FESEM). They were deposited on a silver electrode (AgE, surface area, 0.0216cm2) to give a sensor with a fast response towards methanol in liquid phase. The sensor also exhibits good sensitivity and long-term stability, and enhanced electrochemical response. The calibration plot is linear (r2=0.9809) over the 0.25mmolL−1 to 0.25molL−1 methanol concentration range. The sensitivity is ∼5.79μAcm−2mM−1, and the detection limit is 0.16±0.02mmolL−1 (signal-to-noise ratio, at a SNR of 3). We also discuss possible future prospective uses of this codoped semiconductor nanomaterial in terms of chemical sensing.
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