Chiral carbon dots and their effect on the optical properties of photosensitizers

Deka, Manash Jyoti; Chowdhury, Devasish

doi:10.1039/c7ra10611d

Cited by 54 publications

(36 citation statements)

References 38 publications

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“…To further understand the surface potential of the prepared carbon dots, zeta potential was investigated. The measured zeta potential was negative, −18 mV ( Figure d), which indicates electronegative surface charge at the interfacial double layer . Carbon dots are considerably stable owing to the electrostatic repulsion between the carbon dots due to the presence of net negative charge.…”

Section: Resultsmentioning

confidence: 98%

“…Carbon quantum dots can be synthesized through either top‐down or bottom‐up approach employing multiple methods such as arc discharge, laser ablation, thermal, ultrasonic, microwave‐assisted synthesis, electrochemical exfoliation, acidic oxidation, solvothermal and hydrothermal synthesis . Some of these methods enhance the fluorescence by employing heteroatom doping and surface passivation steps.…”

Section: Introductionmentioning

confidence: 99%

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Label‐Free Fluorometric Detection of Adulterant Malachite Green Using Carbon Dots Derived from the Medicinal Plant Source Ocimum tenuiflorum

et al. 2019

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Food adulteration is an alarming concern in developing countries causing an increased rate of cancer incidents. This study aims to address this concern by detecting adulteration in green vegetables. A facile green one-step and cost-effective strategy to synthesize carbon quantum dots derived from a herbal source has been utilized to design a fluorescence-based sensor for detecting malachite green (MG), a toxic carcinogenic dye, commonly used as an adulterant to give a fresh green look to green vegetables. The leaf-extract of Ocimum tenuiflorum has been used to synthesize highly photostable carbon dots for detecting MG with a limit of detection (LOD) as low as 18 nM. Further, this principle has been utilized to design a prototype calorimetric sensor. The mechanism of the interaction between malachite green and carbon dots has been probed using DFT by employing the SMD solvation model. In addition, CQDs also possess strong antioxidant activity and minimal cytotoxicity enabling their utilization in many biological and sensing applications. This shows the versatility of these easily scalable carbon dots.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Label‐Free Fluorometric Detection of Adulterant Malachite Green Using Carbon Dots Derived from the Medicinal Plant Source Ocimum tenuiflorum

et al. 2019

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“…Such advancements could be fulfilled using properties reported here, and exploring new ones. Differently to other attempts at preparing chiral carbon nanoparticles 66 – 68 , the rationale brought forward in the present work, accompanied by proper purification and extensive investigation of the chirality, could be extended for preparing other types of carbon dots. By using our approach, chirality could be conferred from different chiral molecules 69 to different core precursors 70 .…”

Section: Discussionmentioning

confidence: 99%

Design principles of chiral carbon nanodots help convey chirality from molecular to nanoscale level

et al. 2018

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The chirality of (nano)structures is paramount in many phenomena, including biological processes, self-assembly, enantioselective reactions, and light or electron spin polarization. In the quest for new chiral materials, metallo-organic hybrids have been attractive candidates for exploiting the aforementioned scientific fields. Here, we show that chiral carbon nanoparticles, called carbon nanodots, can be readily prepared using hydrothermal microwave-assisted synthesis and easily purified. These particles, with a mean particle size around 3 nm, are highly soluble in water and display mirror-image profile both in the UV–Vis and in the infrared regions, as detected by electronic and vibrational circular dichroism, respectively. Finally, the nanoparticles are used as templates for the formation of chiral supramolecular porphyrin assemblies, showing that it is possible to use and transfer the chiral information. This simple (and effective) methodology opens up exciting opportunities for developing a variety of chiral composite materials and applications.

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“…L-CQDs were synthesized from L-Trp and D-CQDs from D-Trp. 36 This process can be called asymmetric synthesis process, which is also known as chiral synthesis. According to the CD spectra of L-/D-CQDs, they present two additional CD signals near 240 and 290 nm compared with L-/D-Trp.…”

Section: Synthetic Mechanism Of L-/d-cqdsmentioning

confidence: 99%

Investigation on the chirality mechanism of chiral carbon quantum dots derived from tryptophan

et al. 2019

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Chiral carbon dots and their effect on the optical properties of photosensitizers

Abstract: In this work, we have successfully prepared intrinsically chiral carbon dots from chiral precursors. We have also demonstrated that the chirality of these carbon dots can affect the optical properties of photosensitizer molecules like azobenzene.

Cited by 54 publications

References 38 publications

Label‐Free Fluorometric Detection of Adulterant Malachite Green Using Carbon Dots Derived from the Medicinal Plant Source Ocimum tenuiflorum

Label‐Free Fluorometric Detection of Adulterant Malachite Green Using Carbon Dots Derived from the Medicinal Plant Source Ocimum tenuiflorum

Design principles of chiral carbon nanodots help convey chirality from molecular to nanoscale level

Investigation on the chirality mechanism of chiral carbon quantum dots derived from tryptophan

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