A novel N/Au co-doped carbon dot probe for continuous detection of silicate and phosphate by resonance Rayleigh scattering

The Analyst
Jiao LiZhiliang Jiang

Abstract

Co-doped carbon dots are new multifunctional carbon nanomaterials. Their fast preparation and new analytical applications such as in continuous detection and resonance Rayleigh scattering (RRS) probes are of interest to people. Herein, the N/Au co-doped carbon dots (CDN/Au) were prepared quickly by a microwave synthesis method using fructose as the carbon source and urea and HAuCl4 as dopants, and it exhibited an excellent RRS effect at 555 nm. Based on both silicate (SiO32-) and phosphate (PO43-) reacting with ammonium molybdate to form silicomolybdate heteropoly acid (SiMo) and phosphomolybdate heteropoly acid (PMo), PMo decomposed by the addition of citric acid, and SiMo/PMo combined with CDN/Au to show good RRS analytical properties, and a new strategy was developed to detect SiO32- and PO43- by the CDN/Au probes continuously. With the increase of SiO32- (PO43-), SiMo (PMo) reacted with CDN/Au probes to form more big particles which resulted in the RRS intensity enhancement at 555 nm, and had a good linear relationship with the SiO32- (PO43-) concentration in the range of 1.11 μg L-1-19.98 μg L-1, with detection limits of 0.3 μg L-1 SiO32- and 0.3 μg L-1 PO43-. Accordingly, a new RRS method was established for continuous de...Continue Reading

References

Nov 5, 2016·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Ying ShiXiaoli Hu
Apr 11, 2017·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Hiroyuki ArafuneAkira Yamaguchi
Aug 16, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Yue ChengYan Li

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Citations

Jul 31, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Guili GeCan Guo

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Methods Mentioned

BETA
biosensors
X-ray
ion exclusion chromatography
transmission electron microscopy
scanning electron microscopy

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