Ratiometric determination of Cr(VI) based on a dual-emission fluorescent nanoprobe using carbon quantum dots and a smartphone app

Yao, Chi-Xuan; Liu, Qingrun; Zhao, Ning; Liu, Jingmin; Fang, Guozhen; Wang, Shuo

doi:10.1007/s00604-021-04747-8

Cited by 22 publications

(6 citation statements)

References 37 publications

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“…In summary, the FT-IR and XPS results of R-CDs are consistent. The existence of polar functional groups in R-CDs enables them to disperse well in aqueous solution, which also can promote their interaction with Cr(VI) [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

Solid-Phase Synthesis of Red Fluorescent Carbon Dots for the Dual-Mode Detection of Hexavalent Chromium and Cell Imaging

Wang

Wei

et al. 2022

Biosensors

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The excellent optical properties and biocompatibility of red fluorescence carbon dots (R-CDs) provide a new approach for the effective analysis of hexavalent chromium (Cr(VI) in environmental and biological samples. However, the application of R-CDs is still limited by low yield and unfriendly synthesis route. In this study, we developed a new type of R-CDs based on a simple and green solid-phase preparation strategy. The synthesized R-CDs can emit bright red fluorescence with an emission wavelength of 625 nm and also have an obvious visible light absorption capacity. Furthermore, the absorption and fluorescence signals of the R-CDs aqueous solution are sensitive to Cr(VI), which is reflected in color change and fluorescence quenching. Based on that, a scanometric and fluorescent dual-mode analysis system for the rapid and accurate detection of Cr(VI) was established well within the limit of detection at 80 nM and 9.1 nM, respectively. The proposed methods also possess high specificity and were applied for the detection of Cr(VI) in real water samples. More importantly, the synthesized R-CDs with good biocompatibility were further successfully applied for visualizing intracellular Cr(VI) in Hela cells.

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Section: Resultsmentioning

confidence: 99%

Solid-Phase Synthesis of Red Fluorescent Carbon Dots for the Dual-Mode Detection of Hexavalent Chromium and Cell Imaging

Wang

Wei

et al. 2022

Biosensors

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“…CQDs capable of easy functionalization, tunable PL, etc., portray diverse sensing applications. [ 274 ] The nonblinking PL capability enables tracking of single molecules and thus CQDs have been proved to be instrumental for the detection of heavy metal ions (Cr 6+/3+ , [ 90,275,276 ] Hg 2+ , [ 61,220,277–281 ] Fe 2+ , [ 23,113 ] Cu 2+ , [ 282–285 ] Ag +[ 286 ] ), anions (I − , [ 278 ] NO 2 − , [ 287 ] F − , [ 278 ] S 2 O 3 2− , [ 288 ] ClO −[ 289 ] ), small molecules (thrombin, [ 290 ] hyaluronidase, [ 291 ] glyphosate, [ 292 ] glucose, [ 56,127 ] H 2 O 2 , [ 49,56,285,293 ] dopamine, [ 70 ] tannic acid, [ 294 ] uric acid, [ 193 ] glycine, [ 295 ] ), temperature, [ 70 ] and pH [ 296,297 ] over the years. The capability of CQD to take up the dual roles of electron source and sink is the major reason for the fluorescent detections.…”

Section: Applicationsmentioning

confidence: 99%

Doping and Surface Modification of Carbon Quantum Dots for Enhanced Functionalities and Related Applications

John

Nair

2021

Part & Part Syst Charact

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Carbon quantum dots (CQDs) are a unique class of 0D nanomaterials, featured by a graphitic core and shell layers saturated with hydrogen atoms and functional groups. CQDs are prepared through top‐down and bottom‐up strategies from natural and synthetic precursors. CQDs can be modified through chemical (e.g., surface functionalization/passivation, doping, etc.) and physical (e.g., core–shell architecture, composite material blending, etc.) strategies to control their properties. This review highlights the effect of such modifications on the photophysical properties of CQDs, such as photoluminescence (PL), absorbance, and relaxivity. The dependence of PL upon the size, orientation at the edges, surface and edge functionalization, doping, excitation wavelength, concentration, pH, aggregate formation, etc., are summarized along with the supporting theoretical evidence available in the literature. Also, this review outlines the recent advancements, and future prospective of optical (e.g., sensing, bioimaging, and fluorescent ink) and catalytic applications (e.g., photocatalysis and electrocatalysis) of CQDs enhanced through physical and chemical modifications of their structure and composition.

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“…Compared with these methods, the fluorescence analysis is considered preferable in DOX detection on account of its sensitivity, simplicity, and easy visualization . However, conventional fluorescence analysis primarily relies on a single fluorescent signal so it is susceptible to environmental and background interference during the sensing process . Dual-signal ratiometric fluorescent sensors can overcome this issue by providing an internal self-calibration system .…”

Section: Introductionmentioning

confidence: 99%

Smartphone-Integrated Molecularly Imprinted Ratiometric Fluorescent Sensor for Selective and Visual Detection of Doxycycline in Lake Water and Foodstuff

Li,

Wu,

Wang

et al. 2024

ACS Sustainable Chem. Eng.

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Doxycycline (DOX) is extensively utilized as a broad-spectrum antibiotic in animals and aquaculture. However, excessive residues of DOX can endanger human health and ecosystems, adversely affecting sustainable development. A novel ratiometric fluorescent probe was designed for specific monitoring of DOX based on boron- and nitrogen-codoped carbon quantum dots encapsulated in metal–organic frameworks coupled with molecularly imprinted polymers (B,N-CQDs/ZIF-8@MIP). In the existence of DOX, the blue fluorescence was quenched owing to the inner filter effect, while the yellow-green fluorescence was enhanced due to the combination of DOX and Zn2+. Benefiting from the dual-signal strategy and the molecularly imprinted layer, the probe exhibited a wide linearity range (0.05–20 mg L–1), a favorable detection limit (LOD) of 14.21 ng mL–1, a fast response time (5 min), and exceptional selectivity. The validity of the probe was verified by detecting DOX in lake water and milk with desirable recoveries (90.16–97.18%). Moreover, a portable sensing device based on a smartphone-integrated B,N-CQDs/ZIF-8@MIP was utilized to achieve DOX visual sensing with a clear color change and an LOD of 44.98 ng mL–1. Therefore, the sensor with the advantages of portability, easy operation, and sensitivity showed tremendous application prospects for on-site detection in food and environmental safety.

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Ratiometric determination of Cr(VI) based on a dual-emission fluorescent nanoprobe using carbon quantum dots and a smartphone app

Cited by 22 publications

References 37 publications

Solid-Phase Synthesis of Red Fluorescent Carbon Dots for the Dual-Mode Detection of Hexavalent Chromium and Cell Imaging

Solid-Phase Synthesis of Red Fluorescent Carbon Dots for the Dual-Mode Detection of Hexavalent Chromium and Cell Imaging

Doping and Surface Modification of Carbon Quantum Dots for Enhanced Functionalities and Related Applications

Smartphone-Integrated Molecularly Imprinted Ratiometric Fluorescent Sensor for Selective and Visual Detection of Doxycycline in Lake Water and Foodstuff

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