scholarly journals Synthesis of Multicolor Carbon Dots Based on Solvent Control and Its Application in the Detection of Crystal Violet

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1556 ◽  
Author(s):  
Zhao ◽  
Liu ◽  
Zhang ◽  
Zhang ◽  
Liao ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Carbon Dots ◽  
Raw Materials ◽  
Quantum Yields ◽  
Characterization Methods ◽  
Long Wavelength ◽  
Solvent Control ◽  
Effective Synthesis ◽  
One Step ◽  
20 Nm

The adjustment of the emitting wavelength of carbon dots (CDs) is usually realized by changing the raw materials, reaction temperature, or time. This paper reported the effective synthesis of multicolor photoluminescent CDs only by changing the solvent in a one-step solvothermal method, with 1,2,4,5-tetraaminobenzene as both the novel carbon source and nitrogen source. The emission wavelengths of the as-prepared CDs ranged from 527 to 605 nm, with quantum yields (QYs) reaching 10.0% to 47.6%, and it was successfully employed as fluorescence ink. The prepared red-emitting CDs (R-CDs, λem = 605 nm) and yellow-emitting CDs (Y-CDs, λem = 543 nm) were compared through multiple characterization methods, and their luminescence mechanism was studied. It was discovered that the large particle size, the existence of graphite Ns, and oxygen-containing functional groups are beneficial to the formation of long wavelength-emitting CDs. Y-CDs responded to crystal violet, and its fluorescence could be quenched. This phenomenon was thus employed to develop a detection method for crystal violet with a linear range from 0.1 to 11 µM and a detection limit of 20 nM.

scholarly journals One-Step Hydrothermal Synthesis of Yellow and Green Emitting Silicon Quantum Dots with Synergistic Effect

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 466
Author(s):  
Zhixia Zhang ◽  
Chunjin Wei ◽  
Wenting Ma ◽  
Jun Li ◽  
Xincai Xiao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Synergistic Effect ◽  
High Efficiency ◽  
Synergistic Effects ◽  
Biomedical Science ◽  
Future Application ◽  
Quantum Yields ◽  
Silicon Quantum Dots ◽  
Long Wavelength ◽  
One Step

The concept of synergistic effects has been widely applied in many scientific fields such as in biomedical science and material chemistry, and has further attracted interest in the fields of both synthesis and application of nanomaterials. In this paper, we report the synthesis of long-wavelength emitting silicon quantum dots based on a one-step hydrothermal route with catechol (CC) and sodium citrate (Na-citrate) as a reducing agent pair, and N-[3-(trimethoxysilyl)propyl]ethylenediamine (DAMO) as silicon source. By controlling the reaction time, yellow-emitting silicon quantum dots and green-emitting silicon quantum dots were synthesized with quantum yields (QYs) of 29.4% and 38.3% respectively. The as-prepared silicon quantum dots were characterized by fluorescence (PL) spectrum, UV–visible spectrum, high resolution transmission electron microscope (HRTEM), Fourier transform infrared (FT-IR) spectrometry energy dispersive spectroscopy (EDS), and Zeta potential. With the aid of these methods, this paper further discussed how the optical performance and surface characteristics of the prepared quantum dots (QDs) influence the fluorescence mechanism. Meanwhile, the cell toxicity of the silicon quantum dots was tested by the 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium (MTT) bromide method, and its potential as a fluorescence ink explored. The silicon quantum dots exhibit a red-shift phenomenon in their fluorescence peak due to the participation of the carbonyl group during the synthesis. The high-efficiency and stable photoluminescence of the long-wavelength emitting silicon quantum dots prepared through a synergistic effect is of great value in their future application as novel optical materials in bioimaging, LED, and materials detection.

scholarly journals One-step solvothermal synthesis of high-emissive amphiphilic carbon dots via rigidity derivation

2018 ◽  
Vol 9 (5) ◽  
pp. 1323-1329 ◽  
Author(s):  
Pei Zhao ◽  
Xuping Li ◽  
Glib Baryshnikov ◽  
Bin Wu ◽  
Hans Ågren ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Solvothermal Synthesis ◽  
Quantum Yields ◽  
One Step ◽  
Chemical Strategy

Here we report a chemical strategy that uses rigid molecules to straightforwardly construct amphiphilic carbon dots (ACDs) with high luminescence quantum yields (QYs).

Preparation and Photocatalysis Properties of TiO2/Graphene Nanocomposites

2012 ◽  
Vol 430-432 ◽  
pp. 1005-1008
Author(s):  
Dong Fang Wang ◽  
Da Chen ◽  
Guang Xing Ping ◽  
Chao Wang ◽  
Hai Zhen Chen ◽  
...  
Keyword(s):  
Solvothermal Method ◽  
Raw Materials ◽  
Chemical Oxidation ◽  
Graphene Nanocomposites ◽  
Photocatalytic Activities ◽  
Potential Applications ◽  
Tio2 Nanomaterials ◽  
One Step ◽  
20 Nm ◽  
Commercial Tio2

In this work, a novel photocatalyst with excellent photocatalytic activities was developed by the combination of TiO2 with graphene oxide (GO). GO was firstly prepared by the chemical oxidation of graphite through Hummers method and the subsequent dispersion and exfoliation in water. Then, GO and P25 nanoparticles (commercial TiO2) were used as raw materials to synthesize TiO2/graphene (TiO2/GE) nanocomposites by using a one-step solvothermal method. TEM images clearly showed that TiO2 nanomaterials (the size of about 15~20 nm) were distributed well onto the two-dimensional (2D) graphene sheets, indicating the formation of TiO2/GE nanocomposites. XRD results indicated that TiO2/GE nanocomposites exhibited TiO2 crystalline phase structure. Meanwhile, it was demonstrated from the methylene blue (MB) photodegradation results that TiO2/GE nanocomposites possessed excellent photocatalytic activities with potential applications.

One-step microwave synthesis of N-doped hydroxyl-functionalized carbon dots with ultra-high fluorescence quantum yields

Nanoscale ◽  
2016 ◽  
Vol 8 (33) ◽  
pp. 15281-15287 ◽  
Author(s):  
Yongqiang Zhang ◽  
Xingyuan Liu ◽  
Yi Fan ◽  
Xiaoyang Guo ◽  
Lei Zhou ◽  
...  
Keyword(s):  
Microwave Synthesis ◽  
Carbon Dots ◽  
Quantum Yields ◽  
Fluorescence Quantum Yields ◽  
One Step ◽  
High Fluorescence

scholarly journals One-step hydrothermal synthesis and optical properties of self-quenching-resistant carbon dots towards fluorescent ink and as nanosensors for Fe3+ detection

RSC Advances ◽  
2019 ◽  
Vol 9 (15) ◽  
pp. 8290-8299 ◽  
Author(s):  
Dandan Xu ◽  
Fang Lei ◽  
Haohong Chen ◽  
Luqiao Yin ◽  
Ying Shi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Citric Acid ◽  
Hydrothermal Synthesis ◽  
Quantum Yield ◽  
Carbon Source ◽  
Nitrogen Source ◽  
Carbon Dots ◽  
Raw Materials ◽  
One Pot ◽  
One Step

Blue CDs with a quantum yield of 30.21% were successfully synthesized by a simple one-pot hydrothermal treatment using citric acid (carbon source) and polyvinyl pyrrolidone (nitrogen source) as the raw materials towards fluorescent ink and as nanosensors for Fe3+ detection.

Carbon dots: materials, synthesis, properties and approaches to long-wavelength and multicolor emission

2017 ◽  
Vol 5 (21) ◽  
pp. 3794-3809 ◽  
Author(s):  
Zhu Lian Wu ◽  
Ze Xi Liu ◽  
Yun Huan Yuan
Keyword(s):  
Energy Transfer ◽  
Surface State ◽  
Carbon Dots ◽  
Raw Materials ◽  
Chemical Doping ◽  
Materials Synthesis ◽  
Long Wavelength ◽  
Synthesis Properties ◽  
Size Controlled

In this mini review, we briefly summarized the raw materials, synthesis and typical properties of CDs and ways to realize long-wavelength and multicolor emission including surface state and size controlled by synthesis strategies, proper precursors, chemical doping and modification, solvatochromic effects and energy transfer.

One-Step Fabrication of Functional Carbon Dots with Long Wavelength Emission for Gene Delivery and Bio-imaging

2021 ◽  
Author(s):  
Xiao-Qi Yu ◽  
Ping Chen ◽  
Xi He ◽  
Xiao-Li Tian ◽  
Ji Zhang
Keyword(s):  
Drug Delivery ◽  
Gene Delivery ◽  
Carbon Dots ◽  
Fluorescent Material ◽  
Long Wavelength ◽  
Bio Imaging ◽  
One Step ◽  
New Type ◽  
Wavelength Emission

As a new-type of fluorescent material, carbon dots (CDs) are promising nanoscale reagents with the potential to integrate the functions of bio-imaging and gene / drug delivery. Most of reported...

scholarly journals One-step preparation of a novel SrCO3/g-C3N4 nano-composite and its application in selective adsorption of crystal violet

RSC Advances ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 6315-6325 ◽  
Author(s):  
Peng Lu ◽  
Xueli Hu ◽  
Yujie Li ◽  
Meng Zhang ◽  
Xiaoping Liu ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Raw Materials ◽  
Selective Adsorption ◽  
Strontium Carbonate ◽  
Nano Composite ◽  
One Step

A novel kind of nanoparticle SrCO3/g-C3N4 was prepared using strontium carbonate (SrCO3) and melamine as raw materials via one-step calcination.

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.

Fast one-step synthesis of N-doped carbon dots by pyrolyzing ethanolamine

2014 ◽  
Vol 2 (36) ◽  
pp. 7477-7481 ◽  
Author(s):  
Xinwei Dong ◽  
Yanjie Su ◽  
Huijuan Geng ◽  
Zhongli Li ◽  
Chao Yang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Carbon Dots ◽  
High Yield ◽  
One Step ◽  
Doped Carbon Dots

N-doped CDs can be obtained directly with high yield by pyrolyzing ethanolamine in air within just 7 minutes with the assistance of hydrogen peroxide.

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