Dual-Emission Carbon Dots for Fluorescent Sensing of Permanganate

Abstract

Dual-emission carbon dots (D-CDs) were facilely synthesized from fluorexon in ethanol via a solvothermal method. The prepared D-CDs with abundant O-/N-containing groups show two significant emissions with a wavelength in the visible region. A fluorescence (FL) platform with high sensitivity and selectivity was developed for detecting MnO4 – in actual matrices using the D-CDs. The intensity ratio at 520 to 436 nm exhibited good linearity across the MnO4 – concentration. Structural and optical characterizations reveal the oxidation of groups on the D-CD surface, which is crucial for amplifying the 520 nm emission while quenching the 436 nm. The oxidation restricted the electron transfer between the receptor and fluorophores associated with 520 nm; however, it also induced dynamic quenching which acted together with static quenching and the inner filter effect (IFE) to decrease the FL intensity of 436 nm. This study presents a general strategy to enable the efficient sensing of contaminants in environmental waters and facilitates the rational design of optical platforms.

Tailoring the Optoelectronic Properties of Soybean-Derived Nitrogen Self-Doped Carbon Dots through Composite Formation with KCl and Zeolite, Synthesized Using Autogenic Atmosphere Pyrolysis

“…The presence of excitation-dependent emission from our carbon dots could find similar applications involving similar types of emissions, such as metal ion detection [52], biosensing and photodynamic therapy [53], and fluorescent sensing and solar cells [54]. In addition, our carbon dots also exhibited dual emission behavior, a unique optical property that can be used in various applications such as cell imaging [55,56], sensing and environmental monitoring [57,58], and light emitting diodes [59].…”

“…Crystals 2024, 14, x FOR PEER REVIEW 11 of 14 dots also exhibited dual emission behavior, a unique optical property that can be used in various applications such as cell imaging [55,56], sensing and environmental monitoring [57,58], and light emitting diodes [59].…”

Nanoscale materials at work: Mapping emerging applications in energy, medicine, and beyond

“…559 Nanosensors have been tested for their sensitivity in the presence of varying concentrations of sodium chloride (NaCl). 560,561 Iron chloride (FeCl3) appears in the context of synthesis and may be utilized in the synthesis of both ferric oxide nanoparticles 562,563 and Fe-MOF nanocomposites. 564 Similarly, urea has also been used in the synthesis of nanocomposites.…”

A portable smartphone platform based on fluorescent carbon quantum dots derived from biowaste for on-site detection of permanganate

“…1 One prominent use of KMnO 4 is in water treatment, where it effectively eliminates impurities like organic matter and iron, thereby enhancing water quality and disinfection. 2,3 Moreover, KMnO 4 functions as a valuable disinfectant for fruits, vegetables, tableware, and other items, thereby ensuring compliance with food safety and hygiene standards. 4,5 Additionally, this versatile compound finds application as an antibacterial agent and as a preservative in select cosmetics and skincare products, further contributing to their efficacy and longevity.…”