One-step microwave synthesis of N,S co-doped carbon dots from 1,6-hexanediamine dihydrochloride for cell imaging and ion detection

Ding, Caihe; Deng, Zhiqin; Chen, Jiucun; Jin, Yanzi

doi:10.1016/j.colsurfb.2020.110838

Cited by 54 publications

(35 citation statements)

References 35 publications

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“…The N,S-CDs were successfully employed in the detection of MnO 4and Cr 2 O 7 2and showed excellent biocompatibility. 189 Jaiswal et al developed a simple one step microwave mediated synthesis of CDs using biocompatible PEG as a sole source of carbon and a passivating agent. 190 An aqueous PEG solution was irradiated for 10 min to generate the amorphous CDs with an estimated average size of 3.6 -5.4 nm.…”

Section: Microwave Methodsmentioning

confidence: 99%

Carbon dots for cancer nanomedicine: a bright future

et al. 2021

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Section: Microwave Methodsmentioning

confidence: 99%

Carbon dots for cancer nanomedicine: a bright future

et al. 2021

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“…Carbon dot (CD) is a new class of fluorescence carbon material that has been attracting considerable interest owing to their outstanding properties such as good water solubility, low toxicity, favorable biocompatibility, good photo-stability, tunable surface functionalities, and cell membrane permeability [1,2]. However, CDs have low quantum yields (QY) and few active sites, which limits their wider applications in fluorescent bioimaging [3][4][5], biosensing [6,7], ions and molecules detection [8,9], novel photoscience [10][11][12][13], and electrocatalysis [14]. Therefore, developing the methods to improve the fluorescent properties of CDs is extremely important.…”

Section: Introductionmentioning

confidence: 99%

“…After doping with N atoms, CDs become n-type semiconductors. In the case where CDs act as n-type semiconductors, they may form substitution defects in sp 3 -bonded diamond thin films [23]. Hence, nitrogen and phosphorus co-doping would change the electronic characteristics of CDs, as well as control their physical and chemical properties, leading to higher QY.…”

Section: Introductionmentioning

confidence: 99%

Detection of Ferric Ions and Catecholamine Neurotransmitters via Highly Fluorescent Heteroatom Co-Doped Carbon Dots

Lee

Kim

et al. 2020

Sensors

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Carbon dots (CDs) demonstrate very poor fluorescence quantum yield (QY). In this study, with the help of a hydrothermal method, we combined CDs with nitrogen and phosphorus elements belonging to the VA group (in the periodic table) to form heteroatom co-doped CDs, i.e., nitrogen and phosphorus co-doped carbon dots (NPCDs). These displayed a significant improvement in the QY (up to 84%), which was as much as four times than that of CDs synthesized by the same method. The as-prepared NPCDs could be used as an “off-on” fluorescence detector for the rapid and effective sensing of ferric ions (Fe3+) and catecholamine neurotransmitters (CNs) such as dopamine (DA), adrenaline (AD), and noradrenaline (NAD). The fluorescence of NPCDs was “turned off” and the emission wavelength was slightly red-shifted upon increasing the Fe3+ concentration. However, when CNs were incorporated, the fluorescence of NPCDs was recovered in a short response time; this indicated that CN concentration could be monitored, relying on enhancing the fluorescence signal of NPCDs. As a result, NPCDs are considered as a potential fluorescent bi-sensor for Fe3+ and CN detection. Particularly, in this research, we selected DA as the representative neurotransmitter of the CN group along with Fe3+ to study the sensing system based on NPCDs. The results exhibited good linear ranges with a limit of detection (LOD) of 0.2 and 0.1 µM for Fe3+ and DA, respectively.

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“…Figure 2a represents the UV-Vis absorption of CQDs solutions. A specific absorption peak at ~ 268 nm related to the π-π* transition of electrons in the conjugated C=C band, and adsorption peak at 300 ~ 350 nm assigned to the n-π* transition of C=N, C-N, C=S, and C=O bonds [21,33,34]. The low-intensity absorption of n → π* is ascribed to the lower content and weak electron transition of the functional groups in CQDs.…”

Section: Characterizationmentioning

confidence: 99%

N, S doped carbon quantum dots inside mesoporous silica for effective adsorption of methylene blue dye

et al. 2021

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This study aimed to develop non-metal elements for doping carbon quantum dots (CQDs) with nitrogen and sulfur (N, S-CQDs), which loaded inside hexagonal mesoporous silica (HMS) in order to effectively remove methylene blue dye (MB) from an aqueous solution. The histidine and cysteine amino acids were used as the source for synthesis N, S-CQDs through the hydrothermal method. Morphology and structure of the N, S-CQDs, and adsorbent (N, S-CQDs/HMS) were characterized by using different microscopic and spectroscopic techniques. The adsorption parameters such as adsorbent dosage (0.25–1 g/L), pH (2–10), contact time (15–75 min), and initial MB dye concentration (20–300 mg/L) were investigated. The maximum adsorption capacity and removal efficiency of MB were determined at 370.4 mg/g and 97%, respectively, under optimum conditions at 303 K. The adsorption isotherm studies were fitted with the Freundlich isotherm equation, and the dye removal kinetics of the adsorbent followed the pseudo-second-order model. Thermodynamic studies showed that the adsorption process had exothermic and spontaneous behavior. The removal of MB next to the Rhodamine B and Reactive Black 5 dyes indicated that the N, S-CQDs/HMS had excellent selective behavior for MB absorption. This prepared adsorbent could be well recycled with suitable activity after four repeated adsorption–desorption cycles. Results revealed that the porous characters, surface area, charge properties, reduction in the bandgap, and quantum yield of the N, S-CQDs/HMS were essential factors that affected dye adsorption.

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One-step microwave synthesis of N,S co-doped carbon dots from 1,6-hexanediamine dihydrochloride for cell imaging and ion detection

Cited by 54 publications

References 35 publications

Carbon dots for cancer nanomedicine: a bright future

Carbon dots for cancer nanomedicine: a bright future

Detection of Ferric Ions and Catecholamine Neurotransmitters via Highly Fluorescent Heteroatom Co-Doped Carbon Dots

N, S doped carbon quantum dots inside mesoporous silica for effective adsorption of methylene blue dye

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