Abstract
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•Fabrication of Mg-doped SnO2 (MTO) microcube with Au-coated μ-chip sensor probe.•Bisphenol A detected by MTO microcube for the first time.•Displayed very lower detection limit (2.7 ± 0.1 pM).•Ever found the highest sensitivity (1.63 µAµM-1cm−2).•Safety of environmental and healthcare fields.
Herein, a novel composite material (Magnesium co-doped Tin (IV) oxide; MTO) microcube was synthesized by a simple solution method in basic phase and successfully characterized. It has been used the Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), and Energy-Dispersive Spectroscopy (EDS) techniques for the characterization of MTO. The MTO microcube was used later to modify gold-coated μ-chips to detect unsafe toxin, bisphenol A (BPA) in aqueous medium. Notable sensing performance was achieved with excellent sensitivity (1.63 µAµM−1cm−2), fast response time (∼11 s), wide linear dynamic range (LDR = 0.10 nM – 1.0 mM: R2 = 0.9997), ultra-low detection limit (2.7 ± 0.1 pM at S/N = 3) and excellent reproducibility and repeatability for the MTO/Au/μ-Chip sensor. This MTO fabricated gold-coated μ-chip was further applied with appropriate quantification and determination results in real environmental sample analyses.