scholarly journals A ratiometric fluorescent probe for pH detection based on Ag 2 S quantum dots–carbon dots nanohybrids

2020 ◽  
Vol 7 (7) ◽  
pp. 200482
Author(s):  
Xiaoxue Lei ◽  
Yiying Fu ◽  
Yuan Wu ◽  
Lu Chen ◽  
Jiangong Liang
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Ph Monitoring ◽  
Excitation Wavelength ◽  
Ph Sensing ◽  
Internal Reference ◽  
One Pot ◽  
Dual Emission ◽  
Ph Variation ◽  
Green Fluorescent

In this study, a novel ratiometric fluorescent nanoprobe for pH monitoring has been developed by synthesizing red fluorescent Ag 2 S quantum dots (Ag 2 S QDs) and green fluorescent carbon dots (CDs) nanohybrids (Ag 2 S CDs) in one pot using CDs as templates. The nanoprobe exhibits dual-emission peaks at 500 and 670 nm under a single-excitation wavelength of 450 nm. The red fluorescence can be selectively quenched by increasing pH, while the green fluorescence is an internal reference. Therefore, the change of the relative fluorescence intensity (I 500 /I 670 ) in the ratiometric Ag 2 S CDs probes can be used for pH sensing. The results revealed that I 500 /I 670 of Ag 2 S CDs probes was linearly related to pH variation between pH 5.4 and 6.8. Meanwhile, the Ag 2 S CDs probes possessed a good reversibility along with pH changing between 5.0 and 7.0 without any interruption from common metal ions, proteins and other interferences.

A green synthetic route for the surface-passivation of carbon dots as an effective multifunctional fluorescent sensor for the recognition and detection of toxic metal ions from aqueous solution

2019 ◽  
Vol 11 (4) ◽  
pp. 490-506 ◽  
Author(s):  
K. Radhakrishnan ◽  
P. Panneerselvam ◽  
M. Marieeswaran
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Fluorescent Sensor ◽  
Toxic Metal ◽  
Carbon Quantum Dots ◽  
Synthetic Route ◽  
One Pot ◽  
Hydrothermal Methods

In this work, a green synthetic route was used to create a number of surface passivated fluorescent carbon quantum dots, which are explored as promising sensing probes, via facile one-pot hydrothermal methods.

One-pot fabrication of dual-emission and single-emission biomass carbon dots for Cu2+ and tetracycline sensing and multicolor cellular imaging

2020 ◽  
Vol 412 (27) ◽  
pp. 7481-7489
Author(s):  
Lihui Wu ◽  
Ruiqing Long ◽  
Te Li ◽  
Cui Tang ◽  
Xia Tong ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Cellular Imaging ◽  
Biomass Carbon ◽  
One Pot ◽  
Dual Emission ◽  
Single Emission

Dual-emission carbon dots as biocompatible nanocarrier for in vitro/in vivo cell microenvironment ratiometric pH sensing in broad range

2019 ◽  
Vol 16 (10) ◽  
pp. 2081-2092 ◽  
Author(s):  
Somayeh Hamd-Ghadareh ◽  
Abdollah Salimi ◽  
Fardin Fathi ◽  
Farzad Soleimani
Keyword(s):  
Carbon Dots ◽  
Ph Sensing ◽  
Dual Emission ◽  
Cell Microenvironment ◽  
Ratiometric Ph Sensing

scholarly journals Fluorescent and Mechanical Properties of Silicon Quantum Dots Modified Sodium Alginate-Carboxymethylcellulose Sodium Nanocomposite Bio-Polymer Films

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1476 ◽  
Author(s):  
Ji ◽  
Zhang ◽  
Zhang ◽  
Quan ◽  
Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Sodium Alginate ◽  
Polymer Films ◽  
Composite Films ◽  
Excitation Wavelength ◽  
Hydrothermal Route ◽  
Silicon Quantum Dots ◽  
One Pot ◽  
Bright Blue Fluorescence ◽  
Bright Blue

Highly luminescent silicon quantum dots (SiQDs) were prepared via one-pot hydrothermal route. Furthermore, the optimal synthetic conditions, dependence of the emission spectrum on the excitation wavelength and fluorescent stability of SiQDs were investigated by fluorescence spectroscopy. SiQDs exhibited bright blue fluorescence, and photoluminescence (PL) lifetime is 10.8 ns when excited at 325 nm. The small-sized SiQDs (~3.3 nm) possessed uniform particle size, crystal lattice spacing of 0.31 nm and silicon (111), (220) crystal planes. Luminescent SiQDs/sodium alginate (SA)-carboxymethylcellulose sodium (CMC) nanocomposite bio-polymer films were successfully fabricated by incorporating SiQDs into the SA-CMC matrix. Meanwhile, SiQDs not only impart strong fluorescence to the polymer, but also make the composite films have favorable toughness.

Dual-emission ratiometric probe combining carbon dots and CdTe quantum dots for fluorometric and visual determination of H2O2

2019 ◽  
Vol 296 ◽  
pp. 126665 ◽  
Author(s):  
Rafael C. Castro ◽  
José X. Soares ◽  
David S.M. Ribeiro ◽  
João L.M. Santos
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
Cdte Quantum Dots ◽  
Dual Emission ◽  
Ratiometric Probe

Multi-doped carbon dots with ratiometric pH sensing properties for monitoring enzyme catalytic reactions

2016 ◽  
Vol 52 (59) ◽  
pp. 9247-9250 ◽  
Author(s):  
Ya Wang ◽  
Linlin Lu ◽  
Hui Peng ◽  
Jie Xu ◽  
Fengyang Wang ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Solvothermal Method ◽  
Catalytic Reactions ◽  
Ph Sensing ◽  
One Pot ◽  
Sensing Properties ◽  
Ph Probe ◽  
Doped Carbon Dots ◽  
Ratiometric Ph Sensing

Multi-doped carbon dots (C-dots) were synthesized by a facile one-pot solvothermal method, and the C-dots could be used as a ratiometric pH probe directly without integrating with other dyes, which was demonstrated by monitoring the proton-producing enzyme catalytic reactions.

Facile One-Pot Conversion of Petroleum Asphaltene to High Quality Green Fluorescent Graphene Quantum Dots and Their Application in Cell Imaging

2016 ◽  
Vol 33 (9) ◽  
pp. 635-644 ◽  
Author(s):  
Pinhui Zhao ◽  
Menglong Yang ◽  
Weiyu Fan ◽  
Xiaojuan Wang ◽  
Fanlong Tang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cell Imaging ◽  
Graphene Quantum Dots ◽  
High Quality ◽  
One Pot ◽  
Green Fluorescent

scholarly journals One-Pot Hydrothermal Synthesis of Carbon Dots as Fluorescent Probes for the Determination of Mercuric and Hypochlorite Ions

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1831
Author(s):  
Hsin Lee ◽  
Yen-Chang Su ◽  
Hsiang-Hao Tang ◽  
Yu-Sheng Lee ◽  
Jan-Yee Lee ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Fluorescent Probes ◽  
Carbon Dots ◽  
Limit Of Detection ◽  
Tap Water ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Excitation Wavelength ◽  
One Pot ◽  
Fluorescence Emission Spectra

Nitrogen and sulfur codoped carbon dots (NSCDs) were synthesized via a one-pot hydrothermal method, and citric acid, ethylenediamine, and methyl blue were used as precursors. The obtained NSCDs were spherical with an average size of 1.86 nm. The fluorescence emission spectra of the NSCDs were excitation independent and emitted blue fluorescence at 440 nm with an excitation wavelength at 350 nm. The quantum yield of the NSCDs was calculated to be 68.0%. The NSCDs could be constructed as fluorescent probes for highly selective and sensitive sensing mercuric (Hg2+) and hypochlorite (ClO−) ions. As the addition of Hg2+ or ClO− ions to the NSCDs, the fluorescence intensity was effectively quenched due to dynamic quenching. Under the optimal conditions, the linear response of the fluorescence intensity ranged from 0.7 μM to 15 μM with a detection limit of 0.54 μM and from 0.3 μM to 5.0 μM with a limit of detection of 0.29 μM for Hg2+ and ClO− ions, respectively. Finally, the proposed method was successfully used for quantifying Hg2+ and ClO− ions in spiked tap water samples.

One-pot hydrothermal synthesis of dual-emission fluorescent carbon dots for hypochlorous acid detection

2020 ◽  
Vol 180 ◽  
pp. 108507 ◽  
Author(s):  
Cheng Zhang ◽  
Meilin Liu ◽  
Taotao Li ◽  
Shengjun Liu ◽  
Qian Chen ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Carbon Dots ◽  
Hypochlorous Acid ◽  
One Pot ◽  
Dual Emission ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon
Sign in / Sign up

Export Citation Format

Share Document