scholarly journals Ultraviolet Carbon Nanodots Providing a Dual-Mode Spectral Matching Platform for Synergistic Enhancement of the Fluorescent Sensing

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2679
Author(s):  
Liman Sai ◽  
Shuping Jiao ◽  
Jianwen Yang
Keyword(s):  
Fluorescent Probes ◽  
High Sensitivity ◽  
Inner Filter Effect ◽  
Carbon Nanodots ◽  
Spectral Matching ◽  
Fluorescent Sensing ◽  
Chromium Vi ◽  
Band Emission ◽  
Synergistic Enhancement ◽  
Emissive Property

The sensing of chromium(VI) (Cr(VI)) is highly desired, due to its toxic and carcinogenic effects upon human health. Fluorescent probes, especially carbon nanodots (CNDs), have been widely used for Cr(VI) sensing via the inner filter effect (IFE). However, improving the sensitivity of these probes remains a difficult issue. In this work, CNDs derived from β-Lactoglobulin were applied as an ultrasensitive fluorescent probe for Cr(VI). With 260 nm excitation, the CNDs showed multi-band emission, including an ultraviolet 360 nm peak. The spectral matching of the CNDs with Cr(VI) led to synergistic suppression of both the excitation and emission light in the fluorescent sensing. As a consequence, the CNDs showed high sensitivity toward Cr(VI), the detection limit reaching as low as 20 nM. Moreover, taking advantage of the multi-emissive property of the CNDs, the synergistic effect was proven in an IFE-based sensing system, which might be extended to the design of other kinds of fluorescent probes.

Organophilic Carbon Nanodots with Multi-Band Emission and their Application as a Ratiometric and Colorimetric Fluorescent Sensor

NANO ◽  
2020 ◽  
Vol 15 (08) ◽  
pp. 2050109
Author(s):  
Liman Sai ◽  
Yaoyao Zheng ◽  
Chen Yuan ◽  
Xiaofeng Xu ◽  
Jianwen Yang
Keyword(s):  
Fluorescent Sensor ◽  
Inner Filter Effect ◽  
Carbon Nanodots ◽  
Excitation Wavelength ◽  
Mixed Solution ◽  
Organic Extract ◽  
Practical Applications ◽  
Band Emission ◽  
Fluorescence Color ◽  
Multi Band

In this work, organophilic carbon nanodots (CNDs) were synthesized in acetone from organic extract of plant leaves. The as-prepared CNDs showed multi-band emission, and could be well dispersed in acetone and ethanol. The photoluminescence (PL) of the CNDs at 520[Formula: see text]nm was excitation-independent. The PL in the blue region could be tuned from 420 to 480[Formula: see text]nm through changing of the excitation wavelength. The multi-emissive CNDs were used as a ratiometric and colorimetric sensor for curcumin detection in ethanol. The blue PL of the CNDs at 420[Formula: see text]nm was quenched by curcumin through inner filter effect. Meanwhile, the green PL at 495[Formula: see text]nm and 535[Formula: see text]nm were enhanced with additional fluorescence of curcumin. The value of I[Formula: see text]/I[Formula: see text] and I[Formula: see text]/I[Formula: see text] both increased linearly with the curcumin concentration in the range of 0–15[Formula: see text][Formula: see text]M. The fluorescence color of the mixed solution changed from blue to yellow, and the detection limit reached 36.7[Formula: see text]nM. The sensitive and visual detection of the CNDs probe toward curcumin showed their high potential in practical applications.

scholarly journals Carbon dots as fluorescent probes for detection of VB12 based on the inner filter effect

RSC Advances ◽  
2018 ◽  
Vol 8 (35) ◽  
pp. 19786-19790 ◽  
Author(s):  
X. Y. Sun ◽  
M. J. Yuan ◽  
B. Liu ◽  
J. S. Shen
Keyword(s):  
Fluorescent Probes ◽  
Carbon Dots ◽  
Inner Filter Effect ◽  
Vitamin B ◽  
Fluorescent Sensing ◽  
Filter Effect

We constructed a new fluorescent sensing for vitamin B12 (VB12) and investigated the mechanism of VB12 quenching fluorescence of carbon dots.

scholarly journals Fluorescent Probes for Live Cell Thiol Detection

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3575
Author(s):  
Shenggang Wang ◽  
Yue Huang ◽  
Xiangming Guan
Keyword(s):  
Fluorescent Probes ◽  
Biological System ◽  
High Sensitivity ◽  
Intracellular Distribution ◽  
Live Cell ◽  
Live Cells ◽  
High Demand ◽  
Non Invasive

Thiols play vital and irreplaceable roles in the biological system. Abnormality of thiol levels has been linked with various diseases and biological disorders. Thiols are known to distribute unevenly and change dynamically in the biological system. Methods that can determine thiols’ concentration and distribution in live cells are in high demand. In the last two decades, fluorescent probes have emerged as a powerful tool for achieving that goal for the simplicity, high sensitivity, and capability of visualizing the analytes in live cells in a non-invasive way. They also enable the determination of intracellular distribution and dynamitic movement of thiols in the intact native environments. This review focuses on some of the major strategies/mechanisms being used for detecting GSH, Cys/Hcy, and other thiols in live cells via fluorescent probes, and how they are applied at the cellular and subcellular levels. The sensing mechanisms (for GSH and Cys/Hcy) and bio-applications of the probes are illustrated followed by a summary of probes for selectively detecting cellular and subcellular thiols.

scholarly journals Biological nanoscale fluorescent probes: From structure and performance to bioimaging

2020 ◽  
Vol 39 (1) ◽  
pp. 209-221
Author(s):  
Jiafeng Wan ◽  
Xiaoyuan Zhang ◽  
Kai Zhang ◽  
Zhiqiang Su
Keyword(s):  
Fluorescent Probes ◽  
Organic Dyes ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
High Sensitivity ◽  
Biological Imaging ◽  
Fluorescent Materials ◽  
And Performance

Abstract In recent years, nanomaterials have attracted lots of attention from researchers due to their unique properties. Nanometer fluorescent materials, such as organic dyes, semiconductor quantum dots (QDs), metal nano-clusters (MNCs), carbon dots (CDs), etc., are widely used in biological imaging due to their high sensitivity, short response time, and excellent accuracy. Nanometer fluorescent probes can not only perform in vitro imaging of organisms but also achieve in vivo imaging. This provides medical staff with great convenience in cancer treatment. Combined with contemporary medical methods, faster and more effective treatment of cancer is achievable. This article explains the response mechanism of three-nanometer fluorescent probes: the principle of induced electron transfer (PET), the principle of fluorescence resonance energy transfer (FRET), and the principle of intramolecular charge transfer (ICT), showing the semiconductor QDs, precious MNCs, and CDs. The excellent performance of the three kinds of nano fluorescent materials in biological imaging is highlighted, and the application of these three kinds of nano fluorescent probes in targeted biological imaging is also introduced. Nanometer fluorescent materials will show their significance in the field of biomedicine.

Selective fluorescent sensing and photocatalytic properties of three MOFs based on naphthalene-1,4-dicarboxylic acid and 2,4,5-tri(4-pyridyl)-imidazole

2018 ◽  
Vol 42 (5) ◽  
pp. 3551-3559 ◽  
Author(s):  
Jun-Jie Wang ◽  
Ren-Chun Zhang ◽  
Ya-Li Cao ◽  
Yan-Ang Li ◽  
Yi-Ran Wang ◽  
...  
Keyword(s):  
Dicarboxylic Acid ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
High Sensitivity ◽  
Photocatalytic Properties ◽  
Luminescent Probes ◽  
Fluorescent Sensing ◽  
Degradation Activity

Three MOFs display high sensitivity in the detection of NB and Ca2+ or Co2+ ions as luminescent probes. Moreover, 3 exhibits a relatively good photocatalytic degradation activity of rhodamine B.

Color Tuning of Biomass-Derived Carbon Nanodots by Reaction Temperature Toward White Light-Emitting Diodes

NANO ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. 2050159
Author(s):  
Yi Gong ◽  
Yanbing Han ◽  
Fang Zhang ◽  
Mingyue Zhai ◽  
Xing Chen ◽  
...  
Keyword(s):  
Reaction Temperature ◽  
White Light ◽  
Heating Temperature ◽  
Light Emitting Diode ◽  
Peak Position ◽  
Carbon Nanodots ◽  
One Pot ◽  
Light Emitting ◽  
White Leds ◽  
Band Emission

In this work, carbon nanodots (CNDs) were synthesized from extract of mango leaves. Sphere nanodots were formed rapidly by one-step microwave heating. The photoluminescence (PL) of the CNDs was found greatly dependent on the reaction temperature. The emission peak position of the CNDs changed from 550[Formula: see text]nm to 430[Formula: see text]nm when the heating temperature increased from 120[Formula: see text]C to 150[Formula: see text]C. Particularly, the CNDs synthesized at 130[Formula: see text]C showed multi-band emission at 411[Formula: see text]nm, 480[Formula: see text]nm and 530[Formula: see text]nm, providing emitting color from blue to yellow. Moreover, the free chlorophyll molecules in the solution added red fluorescence at 670[Formula: see text]nm, and the integrated emitting color of the CNDs solution was close to white. Coated on a commercial 365[Formula: see text]nm light-emitting diode (LED) chip, the CNDs showed greenish white light with CIE coordinates of (0.37, 0.44). This work provided a one-pot, rapid and green method to obtain multi-emissive CNDs toward white LEDs.

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