Abstract
A low-cost and environment-friendly sensor was developed for visual determination of gold ions (Au3+) by using label-free hydrogen doped molybdenum oxide (H0.3MoO3) nanoparticles as ratio probes. According to the characterization results of transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction, and Fourier transform infrared spectra, Au3+ is easily reduced to red Au nanoparticles (AuNPs) by blue H0.3MoO3 nanoparticles. The color change of the solution depends on the concentration of Au3+, which makes it possible to detect Au3+ visually. Under optimal experimental conditions of pH 4.6, H0.3MoO3 nanoparticles concentration of 0.075 mg·mL−1, and reaction time of 7 min, the sensor offers a satisfactory determination range from 0.5 to 70 μM and a good determination limit of 0.45 μM for Au3+. The concentration of Au3+ as low as 10 μM can be directly distinguished through the naked eye. Additionally, the colorimetric probe has also been proved applicable in environmental water samples. More importantly, the resulting AuNPs have good stability and oxidase-like activity, which may be directly used in sensing, catalysis, energy, and other fields.
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Funding
The support of this research was from the Foundation of Science and Technology Department of Sichuan Province (Grant No. 2022YFG0134) and Talent Program of Sichuan University of Science & Engineering (Grant No. E10402736).
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Wei Huang: investigation, methodology, writing - review & editing. Long Wang: investigation, methodology, validation. Dengying Long: investigation, writing - original draft. Xiaonan Liu: project administration.
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Huang, W., Wang, L., Long, D. et al. Colorimetric determination and recycling of gold(III) ions using label-free plasmonic H0.3MoO3 nanoparticles. Microchim Acta 190, 245 (2023). https://doi.org/10.1007/s00604-023-05826-8
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DOI: https://doi.org/10.1007/s00604-023-05826-8