scholarly journals One-Pot Synthesis of Bright Blue Luminescent N-Doped GQDs: Optical Properties and Cell Imaging

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2798
Author(s):  
Huaidong Wang ◽  
Chong Qi ◽  
Ailing Yang ◽  
Xiaoxu Wang ◽  
Jie Xu
Keyword(s):  
Optical Properties ◽  
Cell Imaging ◽  
Graphene Quantum Dots ◽  
Surface States ◽  
One Pot ◽  
Ultrasonic Assisted ◽  
Potential Applications ◽  
N Doping ◽  
Average Size ◽  
Bright Blue

High fluorescent graphene quantum dots (GQDs) are promising in bioimaging and optoelectronics. In this paper, bright blue fluorescent N-doped GQDs were synthesized using a ultrasonic-assisted hydrothermal method. The morphology, structure, surface chemistry, optical properties, and stability subject to photo-bleaching, temperature, pH and preservation period for the N-GQDs were investigated in detail using various microscopy and spectroscopy techniques. The results showed that the N-GQDs possessed an average size of 2.65 nm, 3.57% N doping, and up to 54% quantum yield (QY). The photoluminescence (PL) spectra of the N-GQDs are excitation dependent when excited in the range of 300–370 nm and excitation independent in the range of 380–500 nm for the core and surface states emission. The N-GQDs showed excellent photo-bleaching resistance and superior photo-stability. At room temperature and in the pH range of 3–8, the fluorescence of the N-GQDs was almost invariable. The N-GQDs can be stably preserved for at least 40 days. The average decay lifetime of the N-GQDs was 2.653 ns, and the radiative and nonradiative decay rate constants were calculated to be 2.04 × 108 s−1 and 1.73 × 108 s−1, respectively. The PL mechanism was qualitatively explained. The N-GQDs was used for cell imaging, and it showed good results, implying great potential applications for bioimaging or biomarking.

scholarly journals Synthesis of Carbon Quantum Dot Nanoparticles Derived from Byproducts in Bio-Refinery Process for Cell Imaging and In Vivo Bioimaging

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 387 ◽  
Author(s):  
Caoxing Huang ◽  
Huiling Dong ◽  
Yan Su ◽  
Yan Wu ◽  
Robert Narron ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Cell Imaging ◽  
Degradation Products ◽  
Green Fluorescence ◽  
One Pot ◽  
Carbon Nanoparticle ◽  
Carbon Quantum Dot ◽  
Potential Applications ◽  
Main Components

The carbon quantum dot (CQD), a fluorescent carbon nanoparticle, has attracted considerable interest due to its photoluminescent property and promising applications in cell imaging and bioimaging. In this work, biocompatible, photostable, and sustainably sourced CQDs were synthesized from byproducts derived from a biorefinery process using one-pot hydrothermal treatment. The main components of byproducts were the degradation products (autohydrolyzate) of biomass pretreated by autohydrolysis. The as-synthesized CQDs had a size distribution from 2.0–6.0 nm and had high percentage of sp2 and sp3 carbon groups. The CQDs showed blue-green fluorescence with a quantum yield of ~13%, and the fluorescence behaviors were found to be stable with strong resistance to photobleaching and temperature change. In addition, it is found that the as-synthesized CQDs could be used for imaging of cells and tumors, which show potential applications in bioimaging and related fields such as phototherapy and imaging.

scholarly journals A novel AIE-active dye for fluorescent nanoparticles by one-pot combination of Hantzsch reaction and RAFT polymerization: synthesis, molecular structure and application in cell imaging

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32601-32607 ◽  
Author(s):  
Yali Chen ◽  
Zengfang Huang ◽  
Xiaobo Liu ◽  
Liucheng Mao ◽  
Jinying Yuan ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Cell Imaging ◽  
Raft Polymerization ◽  
Fluorescent Nanoparticles ◽  
Hantzsch Reaction ◽  
One Pot ◽  
Fluorescent Polymers ◽  
Potential Applications

This work reported the fabrication of a novel AIE-active dye and its amphiphilic PEG-TPD fluorescent polymers via one-pot combination of RAFT polymerization and Hantzsch reaction, which showed potential applications in bioimaging.

scholarly journals Facile synthesis of graphene quantum dots from glucan and their application as a deoxidizer and in cell imaging

2020 ◽  
pp. 174751982097393
Author(s):  
Jialu Shen ◽  
Weifeng Chen ◽  
Xiang Liu
Keyword(s):  
Quantum Dots ◽  
Driving Force ◽  
Biomedical Applications ◽  
Cell Imaging ◽  
Size Range ◽  
Graphene Quantum Dots ◽  
Reducing Agents ◽  
Facile Synthesis ◽  
Average Size

A facile and effective route to synthesize graphene quantum dots for cell imaging and as a deoxidizer by using glucan as a precursor is developed. AuNPs are successfully synthesized by mixing of graphene quantum dots and Au(III) salts without any additional reductants. The reducing driving force of these graphene quantum dots is much weaker than that of strong reducing agents such as NaBH4. The sizes of the as-synthesized AuNPs are much larger, with an average size of 15 nm. Notably, this size range is specifically useful and optimal for the application of AuNPs in biomedical applications. In addition, the as-synthesized graphene quantum dots are also successfully applied in cell imaging.

Synthesis of Hollow ß-Phase GeO2 in Microemulsion

2013 ◽  
Vol 669 ◽  
pp. 360-365
Author(s):  
Xu Zou ◽  
Bing Bing Liu ◽  
Wei Wu ◽  
Dong Mei Li ◽  
Quan Jun Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ostwald Ripening ◽  
Hollow Structure ◽  
Simple Method ◽  
Light Emitting ◽  
Hollow Interior ◽  
Potential Applications ◽  
One Step ◽  
Average Size ◽  
20 Nm

We fabricated mono-dispersed hollow waxberry shaped ß-quartz GeO2by a facile one-step synthesis in emulsion at room temperature. TEM images indicated that hollow waxberry shaped GeO2were consisted of nano-sphere whose average size were estimated to be 20 nm. The growth mechanism and optical properties of the products were also investigated. The possible formation mechanism of the hollow interior is proposed as the Ostwald ripening. The optical properties of the ß-GeO2nanoparticles with hollow shapes were also studied with photoluminescence spectrum, which reveals a broad emission, suggesting potential applications in electronic and optoelectronic nanodevices. These attractive results provide us a new simple method further used to fabricate other specific hollow structure and indicate hollow waxberry shaped GeO2may have potential applications in light-emitting nanodevices.

Surface chemistry regulates optical properties and cellular interactions of ultrasmall MoS2 quantum dots for biomedical applications

2021 ◽  
Author(s):  
Kangqiang Liang ◽  
Shaohua Qu ◽  
Yixiao Li ◽  
Li-Li Tan ◽  
Li Shang
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Surface Chemistry ◽  
Molybdenum Disulfide ◽  
Biomedical Applications ◽  
Cell Imaging ◽  
Cellular Interactions ◽  
Potential Applications

Molybdenum disulfide quantum dots (MoS2 QDs) have drawn increasing attention owing to their distinct optical properties and potential applications in many fields such as biosensing, photocatalysis and cell imaging. Elucidating...

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

N,S Co-Doped Graphene Quantum Dots for Detection of Riboflavin and Cell Imaging

NANO ◽  
2021 ◽  
pp. 2150123
Author(s):  
Mengting Zhang ◽  
Xiaorong Li ◽  
Hong Xiao ◽  
Bin Zhao ◽  
Wei Bian
Keyword(s):  
Quantum Dots ◽  
Cell Imaging ◽  
Graphene Quantum Dots ◽  
Practical Application ◽  
X Ray ◽  
Pyrolysis Method ◽  
Doped Graphene ◽  
Low Cytotoxicity ◽  
Bright Blue Fluorescence ◽  
Bright Blue

Graphene quantum dots (GQDs) have been extensively used in biosensors and bioimaging. Heteroatom-doped GQDs can regulate material properties and endow them to improve structural and physicochemical properties. In this work, N,S-GQDs were prepared through a high-temperature pyrolysis method using L-cysteine and citric acid as the precursors. The morphology and structure of nanocomposites were identified by TEM, X-ray diffractometer (XRD), X-ray photoelectron spectrometer (XPS), and FTIR. The as-prepared N,S-GQDs show bright blue fluorescence with satisfactory fluorescence quantum yield. N,S-GQDs display significant response to riboflavin, achieving a low detection limit of 27[Formula: see text]nM. The reaction of N,S-GQDs to riboflavin is mainly governed by static quenching. The detection of riboflavin in real samples has been performed to demonstrate its practical application. The obtained N,S-GQDs have low cytotoxicity and have been applied successfully in cell imaging.

Synthesis and applications of graphene quantum dots: a review

2018 ◽  
Vol 7 (2) ◽  
pp. 157-185 ◽  
Author(s):  
Weifeng Chen ◽  
Guo Lv ◽  
Weimin Hu ◽  
Dejiang Li ◽  
Shaona Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Drug Carriers ◽  
Preparation Methods ◽  
New Class ◽  
Advantages And Disadvantages ◽  
Ultrasonic Assisted ◽  
Potential Applications ◽  
Bio Imaging ◽  
Novel Devices

AbstractAs a new class of fluorescent carbon materials, graphene quantum dots (GQDs) have attracted tremendous attention due to their outstanding properties and potential applications in biological, optoelectronic, and energy-related fields. Herein, top-down and bottom-up strategies for the fabrication of GQDs, mainly containing oxidative cleavage, the hydrothermal or solvothermal method, the ultrasonic-assisted or microwave-assisted process, electrochemical oxidation, controllable synthesis, and carbonization from small molecules or polymers, are discussed. Different methods are presented in order to study their characteristics and their influence on the final properties of the GQDs. The respective advantages and disadvantages of the methods are introduced. With regard to some important or novel methods, the mechanisms are proposed for reference. Moreover, recent exciting progresses on the applications of GQD, such as sensors, bio-imaging, drug carriers, and solar cells are highlighted. Finally, a brief outlook is given, pointing out the issues still to be settled for further development. We believe that new preparation methods and properties of GQDs will be found, and GQDs will play more important roles in novel devices and various applications.

Loading of HgS Nanoparticles on the Silica Microspheres

2013 ◽  
Vol 734-737 ◽  
pp. 2298-2301
Author(s):  
Shi Zhao Kang ◽  
Yi Kai Yang ◽  
Xiang Qing Li ◽  
Jin Mu
Keyword(s):  
Optical Properties ◽  
Layer By Layer ◽  
Silica Microspheres ◽  
Quantum Size ◽  
Temperature Heat ◽  
Potential Applications ◽  
Direct Band ◽  
Size Of Particles ◽  
Average Size ◽  
Temperature Heat Treatment

HgS nanoparticles were loaded on the silica microspheres by an improved layer-by-layer self-assembled technique following low temperature heat-treatment. The optical properties of HgS nanoparticles on the silica microspheres were characterized with UV-vis and fluorescence spectra. The results suggested that the HgS nanoparticles were formed on the silica microspheres, and the average size of particles was approximately 15 nm. The direct band gap of the loaded HgS nanoparticles was calculated to be 2.4 eV from the absorption spectrum, which was blue-shifted by 0.4 eV from its bulk value due to quantum size effect. The photoluminescence showed a broad emission around 440 nm from sulfur vacancies. These results indicate that the optical properties of HgS nanoparticles loaded on the silica microspheres are similar to those of free HgS nanoparticles, which is encouraging for potential applications.

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