Abstract
This study synthesized a facile and high sensitive fluorescent probe based on sulfur-doped carbon dots (S-CDs) using a one-step microwave irradiation method. The probe exhibited a strong blue emission and a high quantum yield (QY) of 36.40%. In the detection, the presence of trivalent chromium (Cr(III)) strongly quenched the PL intensity of S-CDs by the inner filter effect (IFE) quenching mechanism of Cr(III) on the S-CDs. The S-CDs exhibited good sensitivity to turn-off Cr(III) detection with a linear range concentration of 0–45 μM and a detection limit of 0.17 μM. Furthermore, the proposed method has been successfully applied for Cr(III) detection in natural water samples with the 93.68–106.20% recoveries.
Highlights
Carbon dots (CDs) are carbon-based nanoparticles that have unique photoluminescent properties such as high photostability (Zhi et al 2018), good solubility in water, modified with specific functional groups for various field applications (Karakoti et al 2015; Farshbaf et al 2018)
The method for synthesizing carbon dots is generally divided into top-down and bottom-up (Zuo et al 2015)
The purpose of this study is to identify whether the naturally present functional groups in succinic acid’s precursor and S will impact the optical properties of CDs and their sensing applications for presenting Cr(III) in water
Summary
Carbon dots (CDs) are carbon-based nanoparticles that have unique photoluminescent properties such as high photostability (Zhi et al 2018), good solubility in water, modified with specific functional groups for various field applications (Karakoti et al 2015; Farshbaf et al 2018). Synthesis of carbon dots by breaking down large particles into nanoparticle-sized particles is called the topdown method, like oxidation (Misra et al 2018; Tan et al 2019), electrochemical (Ahirwar et al 2017), laser ablation (Thongpool et al 2012; Kang et al 2020). The microwave method is a common bottom-up method for synthetic CDs due to being simple, fast, cost-efficient, and environmentally friendly (Ang et al 2020). This method works by vibrating the carbon chain to undergo rearrangement (Guan et al 2020)
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