Simple and Cost‐Effective Synthesis of Fluorescent Graphene Quantum Dots from Honey: Application as Stable Security Ink and White‐Light Emission

Mahesh, Sankarapillai; Lekshmi, C. Lalitha; Renuka, Kizhisseri Devi; Joseph, Kuruvilla

doi:10.1002/ppsc.201500103

Cited by 55 publications

(35 citation statements)

References 49 publications

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“…AFM images [Figure (a)–(b)] clearly show the formation of dots with an average size and thickness of ∼ 90 and ∼4–5 nm, respectively. The d spacing calculated from lattice fringes observed in TEM images [Figure (d)] of dots (90 nm) is found to be ∼0.37 nm which reveal graphene like structure underneath dots . Thus, overall morphology study confirms the formation of hydroxyl functionalized graphene nanodots.…”

Section: Resultsmentioning

confidence: 66%

Water Soluble Fluorescent Graphene Nanodots

et al. 2018

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Water soluble fluorescent graphene nanodots (GND) have been successfully prepared through a bottom up approach from brominated pyrene via alkaline hydrothermal condensation. FT‐IR, UV‐Vis, Raman, XRD, AFM, and TEM studies have shown the formation of −OH group rich nanodots having graphene features with an approximate size of 90 nm. Steady state and 3D fluorescence studies have shown efficient fluorescence emission with maximum at 540 nm upon excitation at 450 nm in pH≤7. Plasmid deoxyribonucleic acid (plasmid DNA) and bovine serum albumin (BSA) have shown their interaction with GND, which was studied via fluorescence quenching of GND and BSA, respectively. Selective quenching of the Förster resonance energy transfer (FRET) of BSA‐GND conjugate via ascorbic acid (AA) has been used to construct a calibration curve for AA estimation with a linear range and limit of detection of 34.00–112.00 μmole/L and 31.343 μmole/L, respectively. GND has also shown concentration‐dependent turn offchemosensing towards heavy metals like Pb2+, Cu2+, Hg2+ and Zn2+. In‐vitromulticolor fluorescence imaging has been observed in GND‐labelled HeLa (human cervical cancer) and NIH‐3T3 (mouse embryonic fibroblast) cell lines with better uptake by HeLa cells. GND also has shown very high viability for both the cell lines up to the tested concentration of 300 μg/mL.

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Section: Resultsmentioning

confidence: 66%

Water Soluble Fluorescent Graphene Nanodots

et al. 2018

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“…Semiconducting nanoparticles include an extensive range of nanomaterials, such as silicon, group III–V or II–VI quantum dots, carbon/graphene dots, and perovskites, etc. Owing to their multiple energy levels at the valence band and conductive band, semiconducting nanoparticles possess both Stokes emission and anti‐Stokes emission (Figure c), holding potential for anticounterfeiting security inks. Here we highlight the key optical tuning features of each semiconducting material toward anticounterfeiting applications.…”

Section: Nanoparticles For Anticounterfeiting Applicationsmentioning

confidence: 99%

Optical Nanomaterials and Enabling Technologies for High‐Security‐Level Anticounterfeiting

et al. 2019

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by 2023 the global anticounterfeiting packaging market is projected to reach 208.4 billion USD. [9] The field of anticounterfeiting has a moving target. Initially, for example, almost every country implemented watermarks or fluorescence labels on banknotes to deter copying. [1] Nowadays, a broad range of optical nanomaterials, including metallic nanoparticles, organic dyes, semiconducting quantum dots, and lanthanide-doped nanoparticles (Figure 1) are available to be explored for developing next-generation anticounterfeiting technologies. Thanks to the rapid development of material science, wet-chemistry methods are available for highly controllable synthesis, allowing a large range of nanoparticles with distinguished optical features to be employed as anticounterfeiting taggants. Among them, lanthanide-doped upconversion nanoparticles (UCNPs) are outstanding for the feasibility to tune their optical properties in multiple dimensions. Here, we survey the recent progress in anticounterfeiting applications using new collections of optical nanomaterials as security inks and point out that UCNPs are one of the most promising candidates for high-security-level anticounterfeiting applications. [10] Moreover, we present an outlook for future trends in encryption and decryption devices and technologies toward their real-world adoptions. Nanoparticles for Anticounterfeiting ApplicationsGenerally, anticounterfeiting is done by verifying authentic information that can be either covert or overt. In a typical decoding process, the retrieved information may manifest itself as fluorescence color and intensity in patterns that are varying in the time and space domains. As a crucial element of anticounterfeiting technology, an encoding material serves as a carrier of distinct authentic information. [15] Hence, to achieve a high anticounterfeiting level, the encoding material should be able to offer abundant optical states that can be tailored to carry unique information. In this regard, nanoparticle materials (Table 1) have attracted tremendous interest owing to their exceptional stability, controllability, and diversity in tuning their optical properties in multiple dimensions, e.g., fluorescence color, intensity, and lifetime value. We surveyed and summarized several key fundamental optical features including reflection, absorption, scattering, and fluorescence that can be Optical nanomaterials have been widely used in anticounterfeiting applications. There have been significant developments powered by recent advances in material science, printing technologies, and the availability of smartphone-based decoding technology. Recent progress in this field is surveyed, including the availability of optical reflection, absorption, scattering, and luminescent nanoparticles. It is demonstrated that advances in the design and synthesis of lanthanide-doped upconversion nanoparticles will lead to the next generation of anticounterfeiting technologies. Their tunable optical properties and optical responses to a range of external stimuli a...

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“…Pyrolysis is one of the simplest carbonization processes and consists of exploiting high temperatures to convert various renewable starting materials into carbonaceous nanoparticles. A facile pyrolysis synthesis of monodisperse GQDs has been developed for the first time by Mahesh et al [ 31 ], via emulsion-templated carbonization of carbohydrates from honey/water emulsion in the presence of butanol. The GQDs obtained from honey have been applied as transparent security ink and a component for white-light emission.…”

Section: Gqds From Eco-friendly Raw Materials By Green Approachesmentioning

confidence: 99%

“… Green synthesis of GQDs and their recent applications in electrochemical sensors [ 9 , 27 , 28 , 31 , 32 , 33 , 34 ]. …”

Section: Figurementioning

confidence: 99%

Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives

et al. 2021

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The continuous decrease in the availability of fossil resources, along with an evident energy crisis, and the growing environmental impact due to their use, has pushed scientific research towards the development of innovative strategies and green routes for the use of renewable resources, not only in the field of energy production but also for the production of novel advanced materials and platform molecules for the modern chemical industry. A new class of promising carbon nanomaterials, especially graphene quantum dots (GQDs), due to their exceptional chemical-physical features, have been studied in many applications, such as biosensors, solar cells, electrochemical devices, optical sensors, and rechargeable batteries. Therefore, this review focuses on recent results in GQDs synthesis by green, easy, and low-cost synthetic processes from eco-friendly raw materials and biomass-waste. Significant advances in recent years on promising recent applications in the field of electrochemical sensors, have also been discussed. Finally, challenges and future perspectives with possible research directions in the topic are briefly summarized.

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Simple and Cost‐Effective Synthesis of Fluorescent Graphene Quantum Dots from Honey: Application as Stable Security Ink and White‐Light Emission

Cited by 55 publications

References 49 publications

Water Soluble Fluorescent Graphene Nanodots

Water Soluble Fluorescent Graphene Nanodots

Optical Nanomaterials and Enabling Technologies for High‐Security‐Level Anticounterfeiting

Graphene Quantum Dots by Eco-Friendly Green Synthesis for Electrochemical Sensing: Recent Advances and Future Perspectives

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