One-step synthesis of N, P Co-doped orange carbon quantum dots with novel optical properties for bio-imaging

2020 ◽  
pp. 110618
Author(s):  
Naixin Li ◽  
Fang Lei ◽  
Dandan Xu ◽  
Yong Li ◽  
Jinliang Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Carbon Quantum Dots ◽  
Bio Imaging ◽  
One Step ◽  
Co Doped

scholarly journals Tailoring Blue-Green Double Emissions in Carbon Quantum Dots via Co-Doping Engineering by Competition Mechanism between Chlorine-Related States and Conjugated π-Domains

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 635 ◽  
Author(s):  
Xue Sun ◽  
Huilian Liu ◽  
Lili Yang ◽  
Xinying Wang ◽  
Weiqiang Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Reaction Time ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Carbon Quantum Dots ◽  
Confinement Effect ◽  
Co Doping ◽  
Photoelectric Properties ◽  
Co Doped

Representing single-layer to tens of layers of graphene in a size less than 30 nm, carbon quantum dots (CQDs) is becoming an advanced multifunctional material for its unique optical, electronic, spin and photoelectric properties induced by the quantum confinement effect and edge effect. In present work, upon co-doping engineering, nitrogen and chlorine co-doped CQDs with uniquely strong blue-green double emissions are developed via a facile and one-pot hydrothermal method. The crystalline and optical properties of CQDs have been well manipulated by tuning the mole ratio of nitrogen/chlorine and the reaction time. The characteristic green emission centered at 512 nm has been verified, originating from the chlorine-related states, the other blue emissions centered at 460 nm are attributed to the conjugated π-domain. Increasing the proportion of 1,2,4-benzentriamine dihydrochloride can effectively adjust the bandgap of CQDs, mainly caused by the synergy and competition of chlorine-related states and the conjugated π-domain. Prolonging the reaction time promotes more nitrogen and chlorine dopants incorporate into CQDs, which inhibits the growth of CQDs to reduce the average size of CQDs down to 1.5 nm, so that the quantum confinement effect dominates into play. This work not only provides a candidate with excellent optical properties for heteroatoms-doped carbon materials but also benefits to stimulate the intensive studies for co-doped carbon with chlorine as one of new dopants paradigm.

One-step Synthesis of Sulfur- and Nitrogen-co-doped Carbon Quantum Dots for Fe(Ⅲ) Detection

2016 ◽  
Vol 37 (4) ◽  
pp. 410-415
Author(s):  
张文宇 ZHANG Wen-yu ◽  
常 青 CHANG Qing ◽  
周雨锋 ZHOU Yu-feng ◽  
魏志佳 WEI Zhi-jia ◽  
李凯凯 LI Kai-kai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
One Step ◽  
Co Doped

scholarly journals Facile one-step fabrication of upconversion fluorescence carbon quantum dots anchored on graphene with enhanced nonlinear optical responses

RSC Advances ◽  
2018 ◽  
Vol 8 (19) ◽  
pp. 10267-10276 ◽  
Author(s):  
Chan Zheng ◽  
Li Huang ◽  
Qiaohang Guo ◽  
Wenzhe Chen ◽  
Wei Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Oxide ◽  
Electrochemical Method ◽  
Nonlinear Optical ◽  
Carbon Quantum Dots ◽  
Upconversion Fluorescence ◽  
Optical Responses ◽  
One Step ◽  
Hybrid Carbon

A novel nanocomposite hybrid, carbon quantum dots (CQD)/graphene oxide (GO), which combines the favorable optical properties of both its components, is synthesized by a facile one-step electrochemical method.

One-Step Synthesis of Nitrogen and Chlorine Co-Doped Carbon Quantum Dots for Detection of Fe3+

NANO ◽  
2017 ◽  
Vol 12 (11) ◽  
pp. 1750135 ◽  
Author(s):  
Yin Zhong ◽  
Qi Chen ◽  
Junjian Li ◽  
Xihao Pan ◽  
Zhiwei Han ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Detection Limit ◽  
High Selectivity ◽  
Carbon Quantum Dots ◽  
High Quantum Yield ◽  
Environment Friendly ◽  
Glucosamine Hydrochloride ◽  
Quenching Efficiency ◽  
One Step ◽  
Co Doped

An environment friendly, economic and maneuverable hydrothermal method was proposed for fabrication of nitrogen and chlorine co-doped carbon quantum dots (N,Cl-CQDs). D-Glucosamine hydrochloride as the only precursor offered source of carbon, nitrogen and chlorine. As a consequent N,Cl-CQDs can emit blue luminescence and detect Fe[Formula: see text] by fluorescence response with high selectivity and sensitivity. There is a linear semilogarithmic correlation between the quenching efficiency [Formula: see text] and the concentration of Fe[Formula: see text] with a detection limit of 0.167 [Formula: see text]M. The N,Cl-CQDs exhibit a high quantum yield of 16.8% along with the fluorescence lifetime of 2.2[Formula: see text]ns. It is worth noting that the prepared N,Cl-CQDs show excellent biocompatibility and they are promising materials for sensing and biology.

scholarly journals Formation of Carbon Quantum Dots via Hydrothermal Carbonization: Investigate the Effect of Precursors

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 986
Author(s):  
Md Rifat Hasan ◽  
Nepu Saha ◽  
Thomas Quaid ◽  
M. Toufiq Reza
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Microcrystalline Cellulose ◽  
Uv Light ◽  
Synthesis Method ◽  
Hydrothermal Carbonization ◽  
Carbon Quantum Dots ◽  
Medical Diagnostics ◽  
Particle Size Range ◽  
Wide Range

Carbon quantum dots (CQDs) are nanomaterials with a particle size range of 2 to 10 nm. CQDs have a wide range of applications such as medical diagnostics, bio-imaging, biosensors, coatings, solar cells, and photocatalysis. Although the effect of various experimental parameters, such as the synthesis method, reaction time, etc., have been investigated, the effect of different feedstocks on CQDs has not been studied yet. In this study, CQDs were synthesized from hydroxymethylfurfural, furfural, and microcrystalline cellulose via hydrothermal carbonization at 220 °C for 30 min of residence time. The produced CQDs showed green luminescence behavior under the short-wavelength UV light. Furthermore, the optical properties of CQDs were investigated using ultraviolet-visible spectroscopy and emission spectrophotometer, while the morphology and chemical bonds of CQDs were investigated using transmission electron microscopy and Fourier-transform infrared spectroscopy, respectively. Results showed that all CQDs produced from various precursors have absorption and emission properties but these optical properties are highly dependent on the type of precursor. For instance, the mean particle sizes were 6.36 ± 0.54, 5.35 ± 0.56, and 3.94 ± 0.60 nm for the synthesized CQDs from microcrystalline cellulose, hydroxymethylfurfural, and furfural, respectively, which appeared to have similar trends in emission intensities. In addition, the synthesized CQDs experienced different functionality (e.g., C=O, O-H, C-O) resulting in different absorption behavior.

scholarly journals Organic dots (O-dots) for theranostic applications: preparation and surface engineering

RSC Advances ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 2253-2291
Author(s):  
Amin Shiralizadeh Dezfuli ◽  
Elmira Kohan ◽  
Sepand Tehrani Fateh ◽  
Neda Alimirzaei ◽  
Hamidreza Arzaghi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photodynamic Therapy ◽  
Photothermal Therapy ◽  
Biomedical Applications ◽  
Surface Engineering ◽  
Graphene Quantum Dots ◽  
Carbon Quantum Dots ◽  
Cargo Delivery ◽  
Bio Imaging ◽  
Theranostic Applications

Organic dots is a term used to represent materials including graphene quantum dots and carbon quantum dots because they rely on the presence of other atoms (O, H, and N) for their photoluminescence or fluorescence properties. Cargo delivery, bio-imaging, photodynamic therapy and photothermal therapy are major biomedical applications of organic dots.

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