Recent development of carbon quantum dots regarding their optical properties, photoluminescence mechanism, and core structure

Abstract

Carbon quantum dots (CDs) are a relatively new class of carbon nanomaterials which have been studied very much in the last fifteen years to improve their already favorable properties.

Sustainable Synthesis of Bright Green Fluorescent Nitrogen‐Doped Carbon Quantum Dots from Alkali Lignin

“…In contrast, CQDs synthesized by the “bottom‐up” strategy have fewer defects and precise controllability of the structure . This route can produce CQDs from small organic molecules through gradual chemical synthesis, pyrolysis, or carbonization . Currently, organic molecules are generally regarded as the most reliable precursors for the formation of high‐quality CQDs .…”

“…[26] This route can produce CQDs from small organic molecules through gradualc hemical synthesis,p yrolysis, or carbonization. [13,27] Currently,o rganic molecules are generally regarded as the most reliable precursors fort he formation of high-quality CQDs. [25] However,m ost organic molecules are stille xpensive and pose challenges to the natural environmenta nd humanh ealth:f or instance, polycyclic aromatic hydrocarbons are strong carcinogens, and thus searching for low-cost and environmentally friendly molecule precursors could boost their abundant applications.…”

Flexible and Robust Electro‐Optically Responsive Films Based on Novel Silica/Oligoaniline/Carbon Dots Composite

“…[5][6][7][8] While these materials offer extraordinary properties, production scale manufacturing of devices based on many of these materials remains a chemistry and engineering challenge due to a variety of factors. [11][12][13][14][15][16] Oligoanilines, as model compounds of polyaniline, have garnered significant interest due to interesting and predictable electroactive properties and potential applications in anticorrosion, sensors, tissue engineering, and energy-related fields. We surmised it might be possible to create composite films with properties similar to organic electronic materials by decorating electroactive components with ortho silicates units, cast them on an ITO surface, and crosslink the ortho silicates hydrolytically.…”

“…To these ends we chose a combination of oligoanilines (based on our previous work) [9,10] and carbon dots (chosen for a number of reasons highlighted below). [11][12][13][14][15][16] Oligoanilines, as model compounds of polyaniline, have garnered significant interest due to interesting and predictable electroactive properties and potential applications in anticorrosion, sensors, tissue engineering, and energy-related fields. [17][18][19][20][21] Introducing oligoanilines in a variety of polymeric architectures can endow them with attractive electroactivity and stimuli-responsiveness, while featuring superior solubility, processability, and tunability.…”

“…[11][12][13] Generally, CDs are composed of inner sp 2 -hybridized carbon atoms, outer sp 3 -hybridized carbon atoms, and surface oxygen-containing functional groups such as amino, epoxy, ether, carbonyl, hydroxyl and carboxylic acid groups, thus making them possess excellent water solubility, easily tunable surface functionalization or subsequent labels with various chemical species. [14][15][16] In view of the fluorescence and tunable surface characteristics of CDs, we surmised that a new hybrid material could be generated through covalent bonds between oligoanilines and CDs. This resultant electro-optical functional composite could be an attractive material for smart windows, intelligent displays, wearable devices, and fast-response sensors.…”