Smart methanol sensor based on silver oxide-doped zinc oxide nanoparticles deposited on microchips

AbstractWe have prepared calcined silver oxide-doped zinc oxide nanoparticles (NPs) by a hydrothermal method using reducing agents in alkaline medium. The doped NPs were characterized by UV/vis, FTIR, and X-ray photoelectron spectroscopy, and by X-ray powder diffraction and field-emission scanning electron microscopy. The NPs were deposited on microchips to result in a sensor that has a fast response to methanol in the liquid phase. Features include high sensitivity, low-sample volume, reliability, reproducibility, ease of integration, long-term stability, and enhanced electrochemical responses. The calibration plot is linear (r2 = 0.9981) over the 0.25 mmolL−1 to 0.25 molL−1 methanol concentration range. The sensitivity is ~7.917 μA cm−2 mmolL−2, and the detection limit is 71.0 ± 0.5 μmolL−1 at a signal-to-noise-ratio of 3. FigureFabrication of highly sensitive (~7.917 μA cm−2) and selective methanol chemical sensor based on hydrothermally prepared silver oxide doped zinc oxide nanoparticles deposited tiny microchips with a detection limit as low as 71.0 μM (at an S/N of 3).

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