On the Nature of Solvothermally Synthesized Carbon Dots

2021 ◽  
Author(s):  
Sergio Ramírez-Barroso ◽  
Alejandra Jacobo-Martín ◽  
Iván Navarro-Baena ◽  
Jaime J. Hernandez ◽  
Cristina Navio ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Carbon Dots ◽  
Carbon Nanodots ◽  
Facile Synthesis

Due to their facile synthesis, biocompatibility, high apparent photoluminescence (PL) quantum yield and applications in photocatalysis, sensing and biomarkers carbon nanodots (CNDs) have been investigated intensively in recent years. Solvothermal...

scholarly journals Facile synthesis of N, P-doped carbon dots from maize starch via a solvothermal approach for the highly sensitive detection of Fe3+

RSC Advances ◽  
2020 ◽  
Vol 10 (55) ◽  
pp. 33483-33489
Author(s):  
Guohua Dong ◽  
Kun Lang ◽  
He Ouyang ◽  
Wenzhi Zhang ◽  
Liming Bai ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Carbon Dots ◽  
Sensitive Detection ◽  
Maize Starch ◽  
Facile Synthesis ◽  
Highly Sensitive ◽  
Highly Sensitive Detection ◽  
Doped Carbon Dots ◽  
Phosphorus Doped ◽  
Nitrogen Phosphorus

Nitrogen/phosphorus-doped carbon dots (N, P-CDs) with a quantum yield as high as 76.5% were synthesized by carbonizing maize starch via a facile ethanol solvothermal approach and utilized for the detection of Fe3+.

scholarly journals Preparation and Characterization of Bacterial Cellulose-Carbon Dot Hybrid Nanopaper for Potential Sensing Applications

2018 ◽  
Vol 9 (1) ◽  
pp. 107 ◽  
Author(s):  
Sakeena Quraishi ◽  
Sven Plappert ◽  
Bernhard Ungerer ◽  
Philip Taupe ◽  
Wolfgang Gindl-Altmutter ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Bacterial Cellulose ◽  
Optical Sensors ◽  
Carbon Dots ◽  
Carbon Nanodots ◽  
Excitation Wavelength ◽  
Single Digit ◽  
Water Contact ◽  
Isolation And Purification ◽  
Sensing Applications

Green and facile approaches aiming at the manufacture of biocompatible paper-based optical sensors reporting the presence of photoluminescence (PL) modulating compounds is an emerging field of research. This study investigates the preparation of bacterial cellulose nanopaper containing covalently immobilized carbon dots for potential biosensing applications. Preliminary work of this feasibility study included TEMPO-mediated ((2,2,6,6-tetramethylpiperidin-1-yl)oxyl-mediated) oxidation and nanofibrillation of bacterial cellulose (TOBC) on the one hand as well as synthesis and comparative analysis of different types of carbon dots (CDs) on the other hand. The two source materials of the targeted functional nanopaper were finally linked to each other by two different N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride/ N-hydroxysuccinimide (EDC/NHS) coupling approaches to clarify whether grafting of CDs prior to or after TOBC paper formation would be the method of choice. Synthesis of the carbon nanodots was accomplished by microwave-assisted co-hydrothermolysis of appropriate precursor compounds. After isolation and purification by dialysis particles in the single-digit nanometer-range were obtained and characterized with regard to their photoluminescence properties in terms of emission wavelength, pH stability, and quantum yield. All types of synthesized CDs reached their PL maxima (450–480 nm; light blue) in a narrow excitation wavelength range of 340–360 nm. Variation of molar (C/N) ratio of the CD precursors and substitution of the nitrogen donor EDEA by urea increased PL and quantum yield (QY), respectively. The highest relative QY of nearly 32% was obtained for CDs synthesized from citric acid and urea. PL of all CDs was virtually insensitive to pH changes in the range of 4–10. Tensile testing of hybrid nanopaper prepared after EDC/NHS-mediated grafting of GEA-type CDs onto TOBC (0.52 mmol·g−1 COOH) in dispersion state revealed that both stiffness and strength are not compromised by incorporation of carbon dots, while plastic deformation and elongation at break increased slightly compared to nanopaper formed prior to decoration with CDs. Water contact angle of the nanopaper is unaffected by introduction of carbon dots which is supposedly due to the presence of surface amino- and amide groups compensating for the loss of carboxyl groups by grafting.

scholarly journals Efficient removal of Cu(ii) from aqueous systems using enhanced quantum yield nitrogen-doped carbon nanodots

RSC Advances ◽  
2020 ◽  
Vol 10 (25) ◽  
pp. 14979-14990 ◽  
Author(s):  
Mohammed Abdullah Issa ◽  
Zurina Z. Abidin ◽  
Musa Y. Pudza ◽  
Hamid Zentou
Keyword(s):  
Quantum Yield ◽  
Carbon Dots ◽  
Value Added ◽  
Carbon Nanodots ◽  
Contaminated Water ◽  
Aqueous Systems ◽  
Efficient Removal ◽  
Copper Adsorption ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Low value waste resources have been converted into value-added luminescence carbon dots for copper adsorption from contaminated water.

Facile synthesis of carbon dots in an immiscible system with excitation-independent emission and thermally activated delayed fluorescence

2015 ◽  
Vol 51 (100) ◽  
pp. 17768-17771 ◽  
Author(s):  
Juan Hou ◽  
Long Wang ◽  
Ping Zhang ◽  
Yuan Xu ◽  
Lan Ding
Keyword(s):  
Quantum Yield ◽  
Carbon Dots ◽  
Preparative Method ◽  
Delayed Fluorescence ◽  
High Quantum Yield ◽  
Facile Synthesis ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
High Quantum ◽  
Immiscible System

A rapid preparative method for carbon dots in an immiscible system was proposed. CDs possess high quantum yield, excitation-independent emission and thermally activated delayed fluorescence.

Facile synthesis of nitrogen-doped carbon dots from pork liver and its sensing of 6-thioguanine based on inner filter effect

2021 ◽  
Author(s):  
Wenjing Chen ◽  
Jun Fan ◽  
Xianxue Wu ◽  
Dongbao Hu ◽  
Yunying Wu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Hydrothermal Method ◽  
Carbon Dots ◽  
Inner Filter Effect ◽  
Facile Synthesis ◽  
Nitrogen Doped ◽  
Pork Liver ◽  
One Step ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

In this work, a facile one-step hydrothermal method was developed to synthesize nitrogen-doped carbon dots (N-CDs) using pork liver. The quantum yield of the prepared N-CDs was as high as...

Facile synthesis and performance of pH/temperature dual-response hydrogel containing lignin-based carbon dots

2021 ◽  
Vol 175 ◽  
pp. 516-525
Author(s):  
Lan Sun ◽  
Zhenye Mo ◽  
Qiong Li ◽  
Dafeng Zheng ◽  
Xueqing Qiu ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Facile Synthesis ◽  
Dual Response ◽  
And Performance
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