scholarly journals The Preparation of Green Fluorescence-Emissioned Carbon Dots/Poly(N-Isopropylacrylamide) Temperature-Sensitive Hydrogels and Research on Their Properties

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1171 ◽  
Author(s):  
Dan Zhao ◽  
Wenting Ma ◽  
Rong Wang ◽  
Xinzhou Yang ◽  
Jun Li ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Fluorescence Spectra ◽  
Cell Imaging ◽  
Fluorescence Probes ◽  
Excitation Wavelength ◽  
Temperature Sensitive ◽  
Green Fluorescence ◽  
Microscope Imaging ◽  
One Step ◽  
Good Biocompatibility

Fluorescence/temperature-sensitive hydrogels, thanks to their properties in fluorescence and temperature sensitivity, have shown a promising outlook in the fields of drug delivery, cell imaging, etc., and thus become the focus of present research. This paper reports the preparation of green-fluorescence/temperature-sensitive hydrogels through one-step radical polymerization with green fluorescence-emissioned carbon dots as fluorescence probes and N-isopropylacrylamide as a monomer. UV-vis spectra, fluorescence spectra, and fluorescence microscope imaging have been used to characterize the prepared hydrogel, and to study their optical and temperature-sensitive properties. It was discovered that the emission of prepared hydrogel is excitation wavelength-dependent, pH responding, and excellent temperature-sensitive, as well as having good biocompatibility. The prepared hydrogel can also be applied as fluorescence ink in the fields of anti-counterfeit identification and appraisal.

scholarly journals A Novel Fluorescent Test Papers Based on Carbon Dots for Selective and Sensitive Detection of Cr (VI)

2020 ◽  
Vol 8 ◽  
Author(s):  
Yizhou Yang ◽  
Xuemei Chen ◽  
Yangyang Wang ◽  
Miao Wu ◽  
Yinan Ma ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Average Diameter ◽  
Hydrothermal Carbonization ◽  
Fluorescence Probes ◽  
Excitation Wavelength ◽  
Tetraacetic Acid ◽  
Yellow Fluorescence ◽  
Lower Detection Limit ◽  
Lower Detection ◽  
One Step

In recent years, carbon dots (CDs) are promising fluorescence probes for ions detection. In this paper, the CDs which are with an average diameter of 5.5 nm were synthesized through a simple one-step hydrothermal carbonization of ethylene diamine tetraacetic acid (EDTA) salt. The CDs have strong yellow photoluminescence (PL) with a maximum emission intensity at 550 nm under an excitation wavelength of 450 nm. As the electron transfer will occur between Cr (VI) and the CDs, yellow fluorescence was quenched after adding the Cr (VI) ions. The CDs probe allows the detection of Cr (VI) ions over a concentration range from 0 to 0.1 M (R2 = 0.987) and the lower detection limit is 10−5 M. Simultaneously, the CDs show highly selectivity and stability toward the detection of Cr (VI) ions.

scholarly journals Green Synthesis of Multifunctional Carbon Dots with Antibacterial Activities

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 369 ◽  
Author(s):  
Arumugam Saravanan ◽  
Moorthy Maruthapandi ◽  
Poushali Das ◽  
John H. T. Luong ◽  
Aharon Gedanken
Keyword(s):  
Carbon Dots ◽  
Fluorescence Spectra ◽  
Antibacterial Effect ◽  
Curcuma Longa ◽  
Antibacterial Activities ◽  
Blue Color ◽  
Mean Size ◽  
One Step ◽  
Bactericidal Activities ◽  
Bright Blue

Carbon dots (CDs) were obtained from medicinal turmeric leaves (Curcuma longa) by a facile one-step hydrothermal method and evaluated for their bactericidal activities against two gram-negative; Escherichia coli, Klebsiella pneumoniae, and two gram-positive counterparts; Staphylococcus aureus, S. epidermidis. The CDs exhibited spherical shapes with a mean size of 2.6 nm. The fluorescence spectra of CDs revealed intense fluorescence at λex/em = 362/429 nm with a bright blue color in an aqueous solution. The CDs showed strong photostability under various environmental conditions (pH, salt, and UV-radiation). The complete bactericidal potency of CDs was 0.25 mg/mL for E.coli and S. aureus after 8 h of exposure, while for K. pneumoniae, and S. epidermidis, the CDs at 0.5 mg/mL good antibacterial effect within 8 h and complete eradication after 24 h of exposure is observed. The release of reactive oxygen species played a crucial role in the death of the bacterial cell. The present study provides a strategy for the preparation of CDs from a medicinal plant and their potential antibacterial activities against four common contagious pathogens.

Facile synthesis of water-soluble and biocompatible fluorescent nitrogen-doped carbon dots for cell imaging

The Analyst ◽  
2014 ◽  
Vol 139 (7) ◽  
pp. 1692-1696 ◽  
Author(s):  
Weiping Wang ◽  
Ya-Chun Lu ◽  
Hong Huang ◽  
Jiu-Ju Feng ◽  
Jian-Rong Chen ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Cell Imaging ◽  
Water Soluble ◽  
Soluble Nitrogen ◽  
Facile Synthesis ◽  
Nitrogen Doped ◽  
Low Toxicity ◽  
Good Biocompatibility ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

A simple and green hydrothermal method was developed for preparation of water-soluble nitrogen-doped carbon dots (N-CDs) from streptomycin. The prepared N-CDs reveal low toxicity, high stability and good biocompatibility, which can be used as fluorescent probes for cell imaging.

Dual-excitation and dual-emission carbon dots for Fe3+ detection, temperature sensing, and lysosome targeting

2021 ◽  
Author(s):  
Xiaofeng Li ◽  
Yuejing Bao ◽  
Xiaorui Dong ◽  
Lihong Shi ◽  
Shaomin Shuang
Keyword(s):  
Hydrothermal Treatment ◽  
Carbon Dots ◽  
Temperature Sensing ◽  
Aminosalicylic Acid ◽  
Green Fluorescence ◽  
Dual Emission ◽  
One Step ◽  
Bright Green ◽  
Bright Green Fluorescence

Dual-excitation and dual-emission carbon dots (CDs) have been prepared by simple one-step hydrothermal treatment of p-phenylenediamine and 5-aminosalicylic acid. As-prepared CDs emit bright green fluorescence under the excitation of 320...

Norepinephrine derived carbon dots for live-cell imaging and effective hemoglobin determination

Soft Matter ◽  
2021 ◽  
Author(s):  
Zhenzhen Lu ◽  
Luke W Giles ◽  
Rico Tabor ◽  
Boon M. Teo
Keyword(s):  
Analytical Chemistry ◽  
Carbon Dots ◽  
Live Cell Imaging ◽  
Cell Imaging ◽  
Fluorescence Probes ◽  
Quantum Yields ◽  
Great Stability ◽  
Fluorescence Quantum Yields ◽  
High Fluorescence ◽  
Potential Use

Recently, carbon dots (CDs) have attracted wide attention for their potential use as fluorescence probes in biological and analytical chemistry due to their great stability and high fluorescence quantum yields....

A novel rapid and green synthesis of highly luminescent carbon dots with good biocompatibility for cell imaging

2014 ◽  
Vol 38 (4) ◽  
pp. 1376-1379 ◽  
Author(s):  
Jun Gong ◽  
Xueqin An ◽  
Xiaojuan Yan
Keyword(s):  
Green Synthesis ◽  
Hydrothermal Method ◽  
Carbon Dots ◽  
Cell Imaging ◽  
Microwave Digestion ◽  
Good Biocompatibility

Fluorescent C-dots with up-conversion luminescence were synthesized by novel microwave digestion involved hydrothermal method.

Carbon dots obtained using hydrothermal treatment of formaldehyde. Cell imaging in vitro

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 9071-9077 ◽  
Author(s):  
M. Algarra ◽  
M. Pérez-Martín ◽  
M. Cifuentes-Rueda ◽  
J. Jiménez-Jiménez ◽  
J. C. G. Esteves da Silva ◽  
...  
Keyword(s):  
Hydrothermal Treatment ◽  
Carbon Dots ◽  
Cell Imaging ◽  
Step Procedure ◽  
One Step

Highly photoluminescent carbon dots have been prepared in a one step procedure by hydrothermal treatment of formaldehyde at 180 °C.

scholarly journals Manganese-Doped Carbon Dots Via Inner Filter Effect for the Sensitive Detection of Tetracycline in Poultry Meat Samples

2021 ◽  
pp. 38-46
Author(s):  
Ke Su ◽  
Guoqiang Xiang ◽  
Yunlong Zhang ◽  
Xin Wang ◽  
Linhui Wang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Inner Filter Effect ◽  
Poultry Meat ◽  
Excitation Wavelength ◽  
Ultraviolet Emission ◽  
Characteristic Absorption Peak ◽  
Filter Effect ◽  
One Step ◽  
Meat Samples ◽  
Doped Carbon Dots

In this study, a rapid and sensitive analytical method has been developed to detect tetracycline hydrochloride (TC) using manganese-doped carbon dots (Mn-CDs) prepared by one-step hydrothermal procedure using 1-(2-pyridinylazo)-2-naohthalenol (PAN) and MnCl2 as precursor reagents. The obtained Mn-CDs showed an ultraviolet emission at 360 nm with an excitation wavelength of 300 nm. TC has a strong characteristic absorption peak at 356 nm, which has a large spectral overlap with the emission band of the Mn-CDs. The fluorescence intensity (FI) of Mn-CDs at 360 nm is linearly quenched within the TC concentration range of 0.1-200 µM. The developed assay for the detection of TC was based on an inner filter effect (IFE) mechanism and is rapid, sensitive, and was successfully applied for the determination of TC in different poultry meat samples with satisfactory results.

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