Abstract
CdO-doped Fe2O3 nanocubes (NCs) were prepared by a hydrothermal method using reducing precursors in alkaline medium, and characterized by UV/vis, FT-IR, Raman, and X-ray photoelectron spectroscopy, by X-ray powder diffraction, energy-dispersive X-ray spectroscopy, and field-emission scanning electron microscopy. The NCs were then deposited on a μ-chip with a surface area (~0.0222 cm2) to fabricate a sensor for detecting fluoride. Compared to sensor performance using gold-electrodes, the new sensor with microchip exhibits better sensitivity, a wider dynamic range, and a better long-term stability. The calibration plot is linear (r2 = 0.9764) over the 10.0 nmolL−1 to 1.0 mmolL−1 fluoride concentration range. The sensitivity is ~2.170 μA cm−2 mmolL−2, and the detection limit (DL, at an SNR of 3) is ~1.8 ± 0.02 nmolL−1. The sensor is fairly simple, works reliably, requires a sample volume of 70.0 μL only, and can be easily integrated into a μ-chip.
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Acknowledgments
This work was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, under grant No. 130-179-D1435. The authors, therefore, acknowledge with thanks DSR technical and financial support.
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Rahman, M.M., Khan, S.B. & Asiri, A.M. A microchip based fluoride sensor based on the use of CdO doped ferric oxide nanocubes. Microchim Acta 182, 487–494 (2015). https://doi.org/10.1007/s00604-014-1345-z
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DOI: https://doi.org/10.1007/s00604-014-1345-z