Herein, a fluorescent nanosensor based on carbon dots (Cdots) and different-size MnO2 nanospheres has been synthesized for rapid detection of glutathione (GSH). Water-soluble highly Cdots were prepared by the microwave method using ascorbic acid as precursor. different sizes (large, medium, small) varying concentration ratio methionine KMnO4 at room temperature, which was confirmed HRTEM analysis. The in result quenching fluorescence intensity, quantum yields, average lifetime values,...

Herein, eco-friendly, water-soluble, and fluorescent carbon quantum dots (CQDs) with an average size of 8.3 nm were synthesized from rice husk (RH) using the hydrothermal method, CQDs labeled as (RH-CQDs). The composition surface functionalities studied X-ray photoelectron spectroscopy, Fourier transform infrared Raman spectroscopy. A study on impact pH irradiation time fluorescence affirmed stability RH-CQDs. as-synthesized nanosensor has high selectivity sensitivity for Fe3+ ions. Several...

Green-emissive carbon quantum dots (CQDs) with exclusive chemosensing aspects were synthesized from orange pomace as a biomass-based precursor via facile microwave method without using any chemicals. The synthesis of highly fluorescent CQDs inherent nitrogen was confirmed through X-ray diffraction, photoelectron, Fourier transform infrared, Raman, and transmission electron microscopic techniques. average size the found to be 7.5 nm. These fabricated displayed excellent photostability, water...

Selective and specific detection of vitamin B 2 with a fluorescent nanoprobe synthesized using green methodology.

Deep eutectic solvents (DESs) have attracted significant attention in recent years due to its environment friendly characteristics and participation the multi-heteroatom doping of carbon quantum dots (CQDs). In this work, we present a simple, fast, environment-friendly microwave synthesis approach for DES-assisted nitrogen chloride co-doped CQDs (N,Cl-CQDs) using choline chloride-urea based DES. A biomass-based precursor, i.e., wheatgrass (Triticum aestivum), has been used as source....

In this work, a sustainable method was developed for the production of water-soluble carbon quantum dots employing green approach. The synthetic protocol employed using microwave pyrolysis technique, while lemon peel served as precursor. Fabrication highly fluorescent lemon-peel-derived CQDs (LP-CQDs) having inherent nitrogen functionality validated by X-ray photoelectron spectroscopy, FTIR, diffraction, Raman spectroscopic analysis, and TEM techniques. average particle size fabricated...

Herein, we develop a facile, sensitive, and selective fluorescent nanosensor for the detection of glutathione (GSH). In this protocol, carbon dots (Cdots) with fairly high quantum yield were synthesized by microwave-assisted pyrolysis technique. Moreover, different shapes MnO2 nanostructure also prepared hydrothermal A comparative photophysical study morphology-dependent Cdots@MnO2 nanostructure-based biosensors was explored, which showed results quenching values ("turn-off") fluorescence...

Coal derived GQDs-Mn 2+ /Mn 7+ nanosensor for the sensitive detection of GSH.

In the field of biochemistry and biosensing, passivation carbon dots using nitrogen dopants has attracted great attention, as this can control their photoluminescence (PL) properties quantum yield. To date, in fabrication a sensing probe, impact chemical composition passivating molecule remained unexplored. work, we chose series different nitrogen-rich precursors (such urea, thiourea, cysteine, glycine) ascorbic acid to synthesize nitrogen-doped (NCDs). A significant change surface states...

The adoption of green alternatives has become critically important for ensuring a sustainable environment in light the state our ecosystem.

In this study, we have reported the binding interaction and photophysics of a nonsteroidal anti-inflammatory drug (NSAID) indomethacin (IMC) in presence different micelles. We used several spectroscopic techniques such as UV-vis absorption, steady state fluorescence time-resolved emission spectroscopy. The spectral properties IMC were modulated micelles compared to that neat water. weak emitting molecule becomes highly fluorescent after with quantum yield lifetime increase those isothermal...

Abstract This study reported the photophysics of 7‐(diethylamino)coumarin‐3‐carboxylic acid N‐succinimidyl ester (7‐ DCCAE ) in different neat solvents varying polarity using steady‐state absorption, fluorescence emission and picosecond time‐resolved spectroscopy. In nonpolar solvents, dye molecule predominantly exists structure exhibits very low value nonradiative decay rate constant ( k nr ), demonstrating takes place from S 1 ‐ LE to 0 ground state. The quantum yields, lifetime values 7‐...

Highly fluorescent and stable nitrogen-doped graphene quantum dots used as nanosensor for the selective sensitive detection of Fe 3+ ions at nanomolar range based on dynamic quenching.

Structural versatility of MnO2 nanostructures plays a significant role in biosensing applications. So, we have prepared simple and selective "turn-off-on" sensing probes for the detection glutathione (GSH), based on nitrogen, sulfur codoped carbon dots (N, S-Cdots) different morphologies one-dimensional (1-D) nanostructures. N, S-Cdots with high fluorescence quantum yield (73.42%) were by green approach through high-temperature pyrolysis just 5 min. The 1-D (nanowires varying aspect ratios...

In this manuscript we have studied the photophysics of 7-(N,N'-diethylamino)coumarin-3-carboxylic acid (7-DCCA) in water/AOT/isooctane reverse micelles. For purpose used steady state absorption and fluorescence emission spectroscopy time resolved spectroscopy. We spectral behaviour 7-DCCA inside micelles with variation excitation wavelength. dynamics solvent rotational relaxation by using two different wavelengths (λ(exi) = 375 nm λ(exi) 405 nm). observed wavelength dependent The quantum...

The photophysics of a hydrophilic molecule, 7-(diethylamino)-coumarin-3-carboxylic acid (7-DCCA), was studied in the presence two macrocycles, (2-hydroxypropyl)-γ-cyclodextrin and cucurbit[7]uril. We have used steady-state absorption, fluorescence, time-resolved fluorescence emission spectroscopy; Fourier transform infrared (FTIR) 1H NMR isothermal titration calorimetry (ITC) to confirm supramolecular host–guest complex formation. spectral properties 7-DCCA were modulated both macrocycles....

The photophysics of lumichrome in the presence cationic and anionic micellar environments was reported this article.

In this work, we have studied the effects of chain length and head group different cationic surfactants on photophysics an anionic dye, 7-(diethylamino)coumarin-3-carboxylic acid (7-DCCA), using steady state absorption fluorescence emission spectroscopy, time resolved spectroscopy. We observed pronounced 7-DCCA, by varying surfactants. The quantum yield, decay time, solvent relaxation rotational changes with effect urea 7-DCCA bound to micellar media found that causes increases in time....