Green synthesis of fluorescent carbon dots for sensitive detection of Fe2+ and hydrogen peroxide

Miscanthus grass-derived carbon dots to selectively detect Fe3+ ions

“…1033 cm À1 were found for carbonyl (C]O), C-N and C-O stretching, respectively. Shi et al 21 also found similar kinds of FTIR peaks in cornstalk-based CDs. FTIR peaks for N-doped MCDs and dual-doped MCDs showed a strong NH 2 scissoring peak at 1582 cm À1 .…”

“…20 Furthermore, the waste products can be obtained at little to no cost. 21 Different wastes, such as used frying oil and kitchen waste, were used as potential precursor for CD synthesis, but the CDs obtained had a very low QY of 3.1%. 22,23 Purkayastha et al 23 and Park et al 24 have used agricultural and food waste, respectively, to synthesize CDs.…”

“…Park and his coworker successfully obtained 120 g of CD from 100 kg of food waste by a room temperature, ultrasonic-assisted method of synthesis. 24 CDs were also synthesized from different vegetable wastes, like onion peel, 25 cornstalks, 21 pseudo banana stems, 26 etc. Paper wastes were also used to synthesize CDs via microwave-assisted pyrolysis, using ionic liquid as solvent.…”

“…10 Detection of metal ions via uorescence probes possesses many advantages, including ease of operation, high selectivity and excellent sensitivity. 21 In comparison to conventional uorescent materials, which use a sensor probe, CDs demonstrate improved properties, including strong size and excitation-dependent photoluminescence (PL), excellent biocompatibility and low toxicity. 22 Until now, many studies have been completed to explore the effective detection of Fe 3+ using CDs as a uorescent material.…”

One Pot Synthesis of Amphiphilic Carbogenic Fluorescent Nanodots for Bioimaging

“…In addition, FND exhibit multicolor fluorescence, which makes them even more versatile as a probe for bioimaging application. Although FND have been synthesized both by either top‐down approaches such as candle soot, fullerenes, activated carbon or bottom‐up approach that uses thermal treatment or microwave treatment of molecules such as citric acid, urea, polyethyleneimine, glucosamine, chitosan, orange juice, horse heart raddish, cornstalk, and lemon peel waste, majority of these FND are hydrophilic in nature. In most cases, oxygen‐ or nitrogen‐containing functional groups like carboxyl, hydroxyl and amine are introduced to give hydrophilicity and hence to increase the solubility of the FND.…”