Graphene Quantum Dots: Simple and Cost‐Effective Synthesis of Fluorescent Graphene Quantum Dots from Honey: Application as Stable Security Ink and White‐Light Emission (Part. Part. Syst. Charact. 2/2016)

Abstract

A simple and cost‐effective synthesis of green luminescent graphene quantum dots (GQDs) from an easily available bioresource, honey (made by bees using nectar from flowers), is illustrated. S. Mahesh and co‐workers from the Indian Institute of Space Science and Technology (IIST), Trivandrum, propose on page 70 that these GQDs with excellent luminescence properties can be utilized as a fluorescent security ink and also as a component for white‐light emission.

Biomolecule-derived quantum dots for sustainable optoelectronics

“…Realizing the need for cheap, renewable, abundant and ecofriendly carbon sources for the synthesis of biomoleculederived QDs (including C-QDs and G-QDs), biomass and their wastes have recently received great attention, and thus far served well to full the requirements for their synthesis. In this regard, various biomass and their wastes, for example, (i) agricultural products, [100][101][102][103][104][105][106][107] (ii) animals and their derivatives, [108][109][110][111][112] (iii) foods (including bakery products and beverages), [113][114][115][116][117][118][119] and (iv) industrial products, 120,121 have been demonstrated to be applicable for the scalable, low-cost synthesis of carbon-based QDs, with superior optical features and applications mostly in biological and sensing purposes. Agricultural products and their wastes, such as rice husk, sugar cane molasses and bagasse, chia seeds, coffee grounds, grass, dead neem leaves, and wood charcoal, have been used as carbon precursors for the fabrication of application-specic C-QDs and G-QDs.…”

“…112 Foods (including bakery products and beverages) and their wastes are an important class of renewable carbon sources for the synthesis of carbon-based QDs. [113][114][115][116][117][118][119] Chattopadhyay and coworkers demonstrated the use of various food products (such as bread, corn akes, biscuits, jaggery and sugar caramel) as carbon sources for the microwave-assisted synthesis of watersoluble nontoxic C-QDs, with excitation-tunable luminescence properties and QYs in the range of 0.63-1.2% (Fig. 6C).…”

“…114 Mahesh et al demonstrated the use of honey as a precursor for the carbonization-based fabrication of G-QDs with excitationtunable luminescence and QY of 3.6%, which were used as a stable security ink and for the generation of white light emission. 115 Notably, overcooked barbeque meat was also used as a raw material for the synthesis of green luminescent C-QDs with excitation-dependent luminescence and QY in the range of 1-2%, which showed photocatalytic activity. 116 Further, C-QDs with a QY of 7.39% and excitation-dependent uorescent characteristics were synthesized using beer as a starting material, which were eventually used for cellular imaging of breast cancerous cells and drug delivery.…”

GSH-doped GQDs using citric acid rich-lime oil extract for highly selective and sensitive determination and discrimination of Fe3+ and Fe2+ in the presence of H2O2 by a fluorescence “turn-off” sensor

“…If natural food could be used as a non-toxic starting material for the synthesis of GQDs, such eco-friendly synthesis would be valuable. Recently there have been a few reports on fabricating uorescent QDs from natural foods such as rice husk, 69 honey, 70 glucose, 71 milk, 72 orange juice 73 and coffee 74 due to their low cost, easy availability, and nearly unlimited sources.…”

Don’t dust off the dust! – A facile synthesis of graphene quantum dots derived from indoor dust towards their cytotoxicity and antibacterial activity

“…The HR-TEM images reveal the presence of uniformly distributed GQDs with an average size of 5.23 nm and an interplanar spacing of 0.31 nm, which corresponds to the basal plane distance of graphite. 51 A co-existence of multiple wellresolved lattice fringes is observed in the HR-TEM images. Further the SAED image exhibiting bright spots in a circular pattern confirms the polycrystalline nature of the quantum dots.…”