A selective sensor for cyanide ion (CN−) based on the inner filter effect of metal nanoparticles with photoluminescent carbon dots as the fluorophore

Facile and large-scale synthesis of green-emitting carbon nanodots from aspartame and the applications for ferric ions sensing and cell imaging

“…The FL emission peak did not shift with the variation of pH value, but the FL intensity was affected to a certain degree. The N-CDs showed a strong and stable FL intensity in a broad pH range (4)(5)(6)(7)(8)(9)(10). Under very acidic or alkaline conditions, the FL intensities were relatively low, probably due to the change in the surface charge of N-CDs, associated with protonation/deprotonation process of amine groups and CN units on the surface or edge [46].…”

“…Unlike organic dye and semiconductor quantum dots, CDs usually own unique excitation-dependent fluorescence (FL) and break through the limitation of toxic heavy metal element during their formaiton. Thus, CDs show encouraging performance in the in vitro and in vivo bioimaging [4,5], chemical sensors and biosensor [6][7][8], fluorescent ink [9], light emitting diodes [10], drug delivery [11], medical diagnosis [12], catalysis [13] and so on.…”

Near-infrared emissive carbon dots with 33.96% emission in aqueous solution for cellular sensing and light-emitting diodes

“…At present, most of the known CDs produce blue to green emissions with ultraviolet or blue excitation, which limits their multi applications [15][16][17][18]. The development of more environmentally friendly synthesis methods for the efficient and controllable preparation of red-emitting CDs with high quantum yields in aqueous solutions is crucial [19][20][21].…”

Carbon quantum dots as a fluorophore for “inner filter effect” detection of metronidazole in pharmaceutical preparations

“…22,23 To date, CDs as a new type of emerging uorescent nanoma terials, have been reported for their promising applications in metal cations and anions analysis, 24,25 photocatalysis, 26 biological imaging, 27,28 biosensors, [29][30][31][32] environmental analysis, 33,34 small molecules detection. [35][36][37] In view of carbon sources, the synthetic strategy are used to prepare carbon dots mainly refers to three kinds of classes, combustion/strong acid oxidizing raw carbon materials, 26 hydrothermal process of biomass, 38,39 carbonization of small molecule carbon precursors with different passivation reagents, achieving simultaneous fabrication and surface functionalization of CDs. 24,40 It is worth note that hydrothermal process of biomass is a simple, cost-effective and environmentally friendly method, and the number of bioresources that can be used for the preparation of carbon dots is more than that of other two types of carbon materials.…”

“…24,40 It is worth note that hydrothermal process of biomass is a simple, cost-effective and environmentally friendly method, and the number of bioresources that can be used for the preparation of carbon dots is more than that of other two types of carbon materials. 39 The inner lter effect (IFE), one of the non-irradiation energy conversions, is owing to the absorption of the excitation and/or emission radiation of uorophores by absorbers in the detection system. [41][42][43] Only the absorption spectra of the absorbers overlap with the excitation and/or emission bands of the uorophore, the IFE would generate effectively.…”