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 CDNs 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.
Highlights
Carbon dots (CDs) are a new type of organic–inorganic hybrid carbon nanomaterial that have outstanding characteristics, such as strong fluorescence, good stability in aqueous solution, weak toxicity, many ways to obtain raw materials, low cost, easy preparation, biocompatibility, and biodegradability [1]
Zhao et al [5] prepared the contamination of waste cellulose diacetate (CDA) from discarded cigarette filters as a precursor to prepare fluorescent N-doped carbon dots (N-CDs) via a one-pot hydrothermal carbonization in an aqueous solution with a low-cost ammonium hydroxide as the passivation agent, and they applied it to the fluorescence-sensing detection of tetracycline (TC)
The results show that when the As3+ concentration is 150 nmol/L, the relative error is within ± 10% and common amino acids and ions have no effect on the measurement of As3+ (Table 1), which indicates that the method has a good selectivity
Summary
Carbon dots (CDs) are a new type of organic–inorganic hybrid carbon nanomaterial that have outstanding characteristics, such as strong fluorescence, good stability in aqueous solution, weak toxicity, many ways to obtain raw materials, low cost, easy preparation, biocompatibility, and biodegradability [1]. The bottom-up method uses different carbon-based precursors to prepare CDs through a series of chemical reactions. Li et al [4] used o-phenylenediamine (o-PD) and hydroquinone (HQ) as precursors, prepared the CDs with different surface states via oxidation/polymerization and a Schiff base reaction at room temperature, and applied them to fluorescent sensors. Zhao et al [5] prepared the contamination of waste cellulose diacetate (CDA) from discarded cigarette filters as a precursor to prepare fluorescent N-doped carbon dots (N-CDs) via a one-pot hydrothermal carbonization in an aqueous solution with a low-cost ammonium hydroxide as the passivation agent, and they applied it to the fluorescence-sensing detection of tetracycline (TC). In order to improve the selectivity and sensitivity of the method, researchers combined CDs with aptamers (Apts) to construct a series of sensors [6,7]. There is no report about the microwave preparation of CD nanosols by CA-EDA and its application to aptamer-mediated catalytic amplification–nanogold RRS/Abs analysis platforms
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