1. A Simple and Sensitive Nanogold RRS/Abs Dimode Sensor for Trace As 3+ Based on Aptamer Controlled Nitrogen Doped Carbon Dot Catalytic Amplification.
- Author
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Bai, Hongyan, Wang, Haolin, Bai, Fuzhang, Liang, Aihui, and Jiang, Zhiliang
- Subjects
SURFACE plasmon resonance ,APTAMERS ,NITROGEN ,RAYLEIGH scattering ,CITRIC acid ,AMPLIFICATION reactions ,GOLD nanoparticles ,DETECTORS - Abstract
Using citric acid (CA) and ethylenediamine (EDA) as precursors, stable nitrogen-doped carbon dots (CD) nanosols were prepared by microwave procedure and characterized in detail. It was found that CD
N s catalyze ethanol (Et)-HAuCl4 to generate gold nanoparticles (AuNPs), which have strong surface plasmon resonance, Rayleigh scattering, (RRS) and a surface plasmon resonance (SPR) absorption (Abs) effect at 370 nm and 575 nm, respectively. Compled the new catalytic amplification indicator reaction with the specific As3+ aptamer reaction, a new RRS/Abs dual-mode aptamer sensor for the assay of trace As3+ was developed, based on the RRS/Abs signals increasing linearly with As3+ increasing in the ranges of 5–250 nmol/L and 50−250 nmol/L, whose detection limits were 0.8 nmol/L and 3.4 nmol/L As3+ , respectively. This analytical method has the advantages of high selectivity, simplicity, and rapidity, and it has been successfully applied to the detection of practical samples. [ABSTRACT FROM AUTHOR]- Published
- 2021
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