Label-free detection of creatinine using nitrogen-passivated fluorescent carbon dots

Kainth, Shagun; Maity, Banibrata; Basu, Soumen

doi:10.1039/d0ra06512a

Cited by 35 publications

(23 citation statements)

References 57 publications

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“…Meanwhile, the electron donor properties of the CDs are strengthened by passivation. Kainth et al 73 synthesized nitrogen-doped CDs using a series of different nitrogenrich precursors (such as urea, thiourea, cysteine, and glycine) as passivating agents. The nitrogen-doped CDs exhibited the PL response feature in the presence of picric acid and creatinine.…”

Section: Electron Donorsmentioning

confidence: 99%

Modulating charge carriers in carbon dots toward efficient solar‐to‐energy conversion

Kim

Lee

et al. 2021

Carbon Energy

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Growing attention to the development of sustainable solar-to-energy conversion applications has resulted in the synthesis of promising and environment-friendly nanomaterials as energy harvesters. Among various carbon nanomaterials, carbon dots (CDs) have received significant attention due to their excellent light absorption capability, broad absorption region, and superior photostability with enormous potential for solar energy applications. Therefore, utilizing and modulating the charge carriers generated from CDs is critical for achieving a high energy conversion efficiency of CDs. Herein, we focus on the distinct characteristics of CDs as energy converters from charge excitation to charge separation and transfer for various solar-to-energy applications, including photovoltaic cells, photocatalysts, and photoelectrocatalysts. We anticipate that this review will offer insight into the synthesis and design of novel nanocomposites with a fundamental analysis of the photochemical properties and future development of energy conversion devices. K E Y W O R D Scarbon dots, charge carrier, energy conversion, photocatalyst, photoelectrocatalyst | INTRODUCTIONCarbon dots (CDs) have received widespread attention in the scientific community as one of the latest additions to carbon-based nanomaterials. CDs, which are typically defined as quasi-spherical carbon nanoparticles of <10 nm, exhibit unique physical, chemical, and optical properties, including high light absorption, tunable photoluminescence, and excellent electron donor/acceptor characteristics. [1][2][3][4][5][6] Owing to these advantages, CDs can be applied in bioimaging, 7,8 biosensing, 9-11 drug delivery, [12][13][14][15] phototherapy, [16][17][18] and light-harvesting applications in energy transducers. [19][20][21] Moreover, the facile and mild synthetic nature of CDs using various combinations of carbon precursors and other molecular agents can provide easy access to the formation of sp 2 -hybridized carbonaceous core of CDs, with an amorphous shell rich in surface functional groups containing oxygen and nitrogen. These surface functional moieties can be potentially functionalized with other organic molecules on the CD surface, allowing the control of photoluminescence (PL)

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Section: Electron Donorsmentioning

confidence: 99%

Modulating charge carriers in carbon dots toward efficient solar‐to‐energy conversion

Kim

Lee

et al. 2021

Carbon Energy

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“…Nanomaterials are promising materials in sustainable development dealing with severe environmental issues such as wastewater treatment, sensing, biofuel production, and many others. Nanomaterials can raise the catalytic activity of biosensors by increasing their transducing surface area .…”

Section: Introductionmentioning

confidence: 99%

Biosensors Based on MnO₂ Nanostructures: A Review

Sohal

Maity

Shetti

et al. 2021

ACS Appl. Nano Mater.

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In recent years, a variety of biosensors based on manganese dioxide (MnO 2 ) nanostructures were used for the detection of different biomolecules. Structural versatility and different oxidation states of Mn present in MnO 2 nanostructures significantly enhance their biosensing applications. In this review, we have mainly focused on different morphologies of MnO 2 nanostructures and their role in different types of biosensors. We are elaborately discussing the electrochemical and optical-based biosensors on different morphologies of MnO 2 and their sensing techniques with proposed mechanisms. In electrochemical biosensors, various electrodes are available but there is a need for cheap, flexible, portable, and nontoxic electrodes. Therefore, we have discussed the fabrication of MnO 2 nanostructures on the surfaces of different types of electrodes and their real-time applications. MnO 2 nanomaterials are used in various optical biosensors due to their excellent light absorption properties, and they act as strong quenching agents. MnO 2 nanomaterials are termed "alternative natural enzymes" due to their significant enzyme-like activity. The study of various morphology-dependent sensing properties of MnO 2 nanostructures provides an insight into the development of many electrochemical and optical biosensors. Recently, MnO 2 based biosensors have earned great popularity as an alternative method for fast and easy detection of many biomolecules with very low detection limits.

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“…These properties of carbon dots have drawn considerable research interest from scientists across the world. By virtue of these properties, carbon dots have found important applications in different fields like bioimaging, , sensing, − drug delivery, , antibacterial agents, photoelectronic devices, thermal and electromagnetic fillers, − and others. − Carbon dot-based nanocomposites have also been studied extensively due to their applicability as fluorescent ink, chemosensors, and light-emitting devices. − Carbon dots have come up as a potential competitor to metal-based nanoparticles − and their composites , due to their inherent biocompatibility. Carbon dots can be synthesized via two approaches: top-down and bottom-up.…”

Section: Introductionmentioning

confidence: 99%

Aggregation-Induced Modulation of the Optoelectronic Properties of Carbon Dots and Removal of Cd²⁺ Ions with Sustainable Use in Photocurrent Generation

Paul

Hazra

Banerjee

2021

ACS Sustainable Chem. Eng.

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Herein, we report the room-temperature fabrication of carbon dots (C-dots) using UV light irradiation within 15 min. The formation pathway has been investigated by time-dependent mass spectroscopic and transmission electron microscopic (TEM) studies. The inherent insolubility of carbon dots in organic solvents has been overcome by employing the phase-transfer strategy, and the C-dots have been found to remain in aggregated state in organic solvents. Interestingly, aggregation leads to the generation of a considerable amount of current conductivity in carbon dots, as is evident by current–voltage (I–V) measurements. This is not attainable by carbon dots in aqueous solution. However, the aggregates of C-dots do not show any photocurrent response. The phase transfer of C-dots has also been utilized to remove the toxic Cd2+ ions from contaminated water by dragging them into the organic solvents with carbon dots. The C-dots–metal hybrid obtained by the removal of Cd2+ with carbon dots in organic medium shows a very good photoresponsive nature with significant photogain. This suggests proper utilization of the removed (from polluted water) cadmium ions in a sustainable manner for photocurrent generation.

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Label-free detection of creatinine using nitrogen-passivated fluorescent carbon dots

Abstract: The role of passivation in CDs using different nitrogen precursors to evaluate its sensing proficiency towards creatinine quantification.

Cited by 35 publications

References 57 publications

Modulating charge carriers in carbon dots toward efficient solar‐to‐energy conversion

Modulating charge carriers in carbon dots toward efficient solar‐to‐energy conversion

Biosensors Based on MnO₂ Nanostructures: A Review

Aggregation-Induced Modulation of the Optoelectronic Properties of Carbon Dots and Removal of Cd²⁺ Ions with Sustainable Use in Photocurrent Generation

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Label-free detection of creatinine using nitrogen-passivated fluorescent carbon dots

Abstract: The role of passivation in CDs using different nitrogen precursors to evaluate its sensing proficiency towards creatinine quantification.

Cited by 35 publications

References 57 publications

Modulating charge carriers in carbon dots toward efficient solar‐to‐energy conversion

Modulating charge carriers in carbon dots toward efficient solar‐to‐energy conversion

Biosensors Based on MnO2 Nanostructures: A Review

Aggregation-Induced Modulation of the Optoelectronic Properties of Carbon Dots and Removal of Cd2+ Ions with Sustainable Use in Photocurrent Generation

Contact Info

Product

Resources

About

Biosensors Based on MnO₂ Nanostructures: A Review

Aggregation-Induced Modulation of the Optoelectronic Properties of Carbon Dots and Removal of Cd²⁺ Ions with Sustainable Use in Photocurrent Generation