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Smart methanol sensor based on silver oxide-doped zinc oxide nanoparticles deposited on microchips |
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| Authors: | Mohammed M. Rahman Sher Bahadar Khan Abdullah M. Asiri |
| Affiliation: | 1. Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah, 21589, P.O. Box 80203, Kingdom of Saudi Arabia 2. Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Kingdom of Saudi Arabia |
| Abstract: | We 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. Fabrication 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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