Photoluminescence enhancement of organic dye by graphene quantum dots

A combination of a graphene quantum dots–cationic red dye donor–acceptor pair and cucurbit[7]uril as a supramolecular sensor for ultrasensitive detection of cancer biomarkers spermine and spermidine

“…A minor contribution from the GQD to BPBP-A energy transfer is also there in this absorption. 57,58 The latter indicates a species like GQDs–BPBP-A* and the previous one, a species like GQDs*–BPBP-A. It is quite obvious that BPBP-A* will produce BPBP-B* and the possibility of formation of GQDs–BPBP-B* is again there from GQDs–BPBP-A*.…”

Graphene quantum dot-porphyrin/phthalocyanine multifunctional hybrid systems: from interfacial dialogue to application

“…[72][73][74][75][76][77][78][79] GQDs have the fascinating characteristics of both two-dimensional (2D) graphene and the exceptional physicochemical properties of QDs, namely, quantum confinement effect, non-zero bandgap, and edge effects. 34,[80][81][82][83] Graphene-based quantum dots (GQDs) have been comprehensively explored due to their desirable attributes such as facile, eco-friendly synthesis, low cost, nontoxicity, good biocompatibility, 36,84,85 high stability, controllable chemical functionality, water dispersibility, surface grafting, stable photoluminescence, 73 robust chemical inertness, 26 excellent electrical, and optical properties, abundant functional groups (e.g., hydroxyl, amino, and carboxyl), electron mobility, and huge surface area, endowing them immense potential applications in the optical, 86 energy, 87 electronic, and biomedical fields. 88,[89][90][91][92][93][94][95][96] Owing to their quantum confinement and special edge effects, GQDs show distinct fluorescent properties and physical and chemical properties.…”

“…15,36,102,103 Some of these properties have spurred a wide range of potential applications 104 of GQDs in photodetectors, fluorescent agents, 73,91 solar cells, bioimaging, 91 sensors, 105 batteries, light-emitting diodes (LEDs), electro-/photo-catalysis, drug delivery, 106 etc. 36,37,77,78,86,[107][108][109][110][111] Not geometrically, but functionally, GQD can be compared with graphene oxide (GO), whose surfaces/edges are usually decorated with carbonyl, hydroxyl, carboxyl, and/or epoxide groups. 24,27,43,[112][113][114][115] With these functional groups, GQDs display amphiphilicity, wherein their core is hydrophobic, while their periphery tends to be hydrophilic, resulting in excellent interfacial activity for dispersing agents or producing Pickering emulsions.…”

“…34,80–83 Graphene-based quantum dots (GQDs) have been comprehensively explored due to their desirable attributes such as facile, eco-friendly synthesis, low cost, non-toxicity, good biocompatibility, 36,84,85 high stability, controllable chemical functionality, water dispersibility, surface grafting, stable photoluminescence, 73 robust chemical inertness, 26 excellent electrical, and optical properties, abundant functional groups ( e.g. , hydroxyl, amino, and carboxyl), electron mobility, and huge surface area, endowing them immense potential applications in the optical, 86 energy, 87 electronic, and biomedical fields. 88,89–96…”

“…15,36,102,103 Some of these properties have spurred a wide range of potential applications 104 of GQDs in photodetectors, fluorescent agents, 73,91 solar cells, bioimaging, 91 sensors, 105 batteries, light-emitting diodes (LEDs), electro-/photo-catalysis, drug delivery, 106 etc . 36,37,77,78,86,107–111…”