Microwave-assisted synthesis of CdSe quantum dots: can the electromagnetic field influence the formation and quality of the resulting nanocrystals?

Nanoscale ◽  
2012 ◽  
Vol 4 (23) ◽  
pp. 7435 ◽  
Author(s):  
Mojtaba Mirhosseini Moghaddam ◽  
Mostafa Baghbanzadeh ◽  
Andreas Keilbach ◽  
C. Oliver Kappe
Keyword(s):  
Quantum Dots ◽  
Electromagnetic Field ◽  
Microwave Assisted Synthesis ◽  
Cdse Quantum Dots ◽  
Microwave Assisted ◽  
Field Influence

One-step microwave-assisted synthesis of water soluble CdSe quantum dots for white light-emitting diodes with excellent color rendering

2013 ◽  
Vol 558 ◽  
pp. 105-108 ◽  
Author(s):  
Tongtong Xuan ◽  
Xiaojun Wang ◽  
Guang Zhu ◽  
Huili Li ◽  
Likun Pan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Soluble ◽  
Microwave Assisted Synthesis ◽  
Cdse Quantum Dots ◽  
Light Emitting ◽  
Microwave Assisted ◽  
One Step ◽  
White Light Emitting Diodes ◽  
Color Rendering ◽  
Excellent Color

Rapid Microwave-Assisted Synthesis of SnO2 Quantum Dots for Efficient Planar Perovskite Solar Cells

2021 ◽  
Vol 4 (2) ◽  
pp. 1887-1893
Author(s):  
Zhengjie Xu ◽  
Yue Jiang ◽  
Zhuoxi Li ◽  
Cong Chen ◽  
Xiangyu Kong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

Size-Controlled Microwave-Assisted Synthesis of Water-Dispersible Cd(Se,S) Quantum Dots for Potential Biological Applications

2015 ◽  
Vol 1784 ◽  
Author(s):  
E. Calderón-Ortiz ◽  
S. Bailón-Ruiz ◽  
L. Alamo-Nole ◽  
J. Rodriguez-Orengo ◽  
O. Perales-Perez
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Quantum Confinement Effect ◽  
Reactive Oxygen Species Generation ◽  
Size Control ◽  
Average Crystallite Size ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

ABSTRACTNanomedicine is fostering significant advances in the development of platforms for early detection and treatment of diseases. Nanoparticles (NPs) like quantum dots (QDs) exhibit size-dependent optical properties for light-driven technologies, which might become important in bio-imaging, sensing and photo-dynamic therapy (PDT) applications. The present research addresses the synthesis of water-stable Cd-based QDs via a Microwave-Assisted synthesis approach using cadmium sulfate salt, and thioglycolic acid as Cd- and S-precursors, respectively. Selenide ions were available by reductive leaching of metallic Selenium in Sodium bisulfite solution. The size control and the tunability of the optical properties were achieved by a suitable control of the reaction temperature (in the 140°C- 190°C range) and reaction time (10 minutes-40 minutes). X-ray diffraction analyses suggested the development of a CdSe,S face cubic centered structure; the broadening of the diffraction peaks indicated the presence of very small nanocrystals in the samples. The average crystallite size was estimated at 5.50 nm ± 1.17nm and 3.72 nm ± 0.04 nm, for nanoparticles synthesized at 180°C after 40 minutes or 10 minutes of reaction, respectively. HRTEM images confirmed the crystalline nature and the small size of the synthesized nanocrystals. In turn, the exciton was red-shifted from 461nm to 549 nm when the reaction temperature was prolonged from 140°C to 190 °C, suggesting the crystal growth. The corresponding band gap values were approximately 2.2 eV, confirming the quantum confinement effect (bulk value 1.74eV). This red shift was also evidenced in PL measurements where the main emission peak was shifted from 507 nm to 564 nm when the samples were excited at 420 nm. A narrow size-tunable emission also was supported by the full width at half maximum (∼ 45 nm) for the synthesized nanocrystals. The reactive oxygen species generation capability of as-synthesized QDs was also investigated. The correlation between the particle size and the generation of (ROS) by the degradation of methylene blue was evident with a reduction of MB concentration from 10μM to 7.5μM and 6.7μM after 15 minutes of UV irradiation for reaction time of 10 min. and 40 min. respectively. No additional degradation was noticed after 60 minutes of irradiation.

Three Minute Ultrarapid Microwave-Assisted Synthesis of Bright Fluorescent Graphene Quantum Dots for Live Cell Staining and White LEDs

2018 ◽  
Vol 1 (4) ◽  
pp. 1623-1630 ◽  
Author(s):  
Weitao Li ◽  
Ming Li ◽  
Yijian Liu ◽  
Dengyu Pan ◽  
Zhen Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Live Cell ◽  
Microwave Assisted Synthesis ◽  
White Leds ◽  
Microwave Assisted ◽  
Cell Staining

scholarly journals Microwave-assisted synthesis of fluorescent carbon quantum dots from an A2/B3 monomer set

RSC Advances ◽  
2017 ◽  
Vol 7 (21) ◽  
pp. 12663-12669 ◽  
Author(s):  
Ari Chae ◽  
Yujin Choi ◽  
Seongho Jo ◽  
Nur'aeni Nur'aeni ◽  
Peerasak Paoprasert ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Succinic Acid ◽  
Carbon Quantum Dots ◽  
High Mass ◽  
Microwave Assisted Synthesis ◽  
Mass Yield ◽  
Microwave Assisted ◽  
Fluorescent Carbon

Strongly fluorescent carbon quantum dots (CQDs) were simply prepared by microwave-assisted synthesis using succinic acid and tris(2-aminoethyl)amine as an “A2 + B3” monomer set with a high mass yield of 17.3%.

Air-exposing microwave-assisted synthesis of CuInS2/ZnS quantum dots for silicon solar cells with enhanced photovoltaic performance

RSC Advances ◽  
2015 ◽  
Vol 5 (124) ◽  
pp. 102682-102688 ◽  
Author(s):  
Ming Hong ◽  
Tongtong Xuan ◽  
Jiaqing Liu ◽  
Ziyao Jiang ◽  
Yiwei Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Microwave Irradiation ◽  
Conversion Efficiency ◽  
Photovoltaic Performance ◽  
Composite Films ◽  
Silicon Solar Cells ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Si Solar Cells

CIS/ZnS QDs were synthesized by microwave irradiation in air. The fabricated QDs/PMMA composite films were first applied to Si solar cells to improve the conversion efficiency by 3.8%.

A Critical Investigation on the Existence of Selective Microwave Absorption in the Synthesis of CdSe Quantum Dots

2014 ◽  
Vol 67 (9) ◽  
pp. 1180 ◽  
Author(s):  
Mojtaba Mirhosseini Moghaddam ◽  
C. Oliver Kappe
Keyword(s):  
Quantum Dots ◽  
Microwave Absorption ◽  
Transmission Electron Microscopy Data ◽  
Microwave Assisted Synthesis ◽  
Cdse Quantum Dots ◽  
X Ray Diffraction ◽  
Heating And Cooling ◽  
Transmission Electron ◽  
Microscopy Data ◽  
Heating Mode

The existence of selective microwave absorption phenomena in the synthesis of CdSe quantum dots has been investigated. These types of microwave effects involving selective microwave absorption by specific reagents have recently been proposed in the microwave-assisted synthesis of various nanoparticles. In the present study, the microwave synthesis of CdSe quantum dots was investigated according to a protocol published by Washington and Strouse to clarify the presence of selective microwave heating. Importantly, control experiments involving conventional conductive heating were executed under otherwise (except for the heating mode) identical conditions, ensuring the same heating and cooling profiles, stirring rates, and reactor geometries. Comparison of powder X-ray diffraction, UV-vis, photoluminescence, and transmission electron microscopy data of the obtained CdSe quantum dots reveals that identical types of nanoparticles are obtained independently of the heating mode. Therefore, no evidence for a selective microwave absorption phenomenon could be obtained.

Microwave-Assisted Synthesis of Biocompatible Silk Fibroin-Based Carbon Quantum Dots

2017 ◽  
Vol 35 (3) ◽  
pp. 1700300 ◽  
Author(s):  
Na Re Ko ◽  
Md Nafiujjaman ◽  
Kondareddy Cherukula ◽  
Sang Ju Lee ◽  
Seoung-Jin Hong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Silk Fibroin ◽  
Carbon Quantum Dots ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

scholarly journals Ultrafast ammonia-driven, microwave-assisted synthesis of nitrogen-doped graphene quantum dots and their optical properties

Nanophotonics ◽  
2017 ◽  
Vol 6 (1) ◽  
pp. 259-267 ◽  
Author(s):  
Binjie Zheng ◽  
Yuanfu Chen ◽  
Pingjian Li ◽  
Zegao Wang ◽  
Bingqiang Cao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Microwave Assisted Synthesis ◽  
Scale Production ◽  
Excitation Spectra ◽  
Nitrogen Doped ◽  
Microwave Assisted ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

AbstractFor the first time, a facile, ultrafast, ammonia-driven microwave-assisted synthesis of high-quality nitrogen-doped graphene quantum dots (NGQDs) at room temperature and atmospheric pressure is presented. This one-step method is very cheap, environment friendly, and suitable for large-scale production. The as-synthesized NGQDs consisting of one to three graphene monolayers exhibit highly crystalline quality with an average size of 5.3 nm. A new fluorescence (FL) emission peak at 390 nm is observed, which might be attributed to the doped nitrogen atoms into the GQDs. An interesting red-shift is observed by comparing the FL excitation spectra to the UV-visible absorption spectra. Based on the optical properties, the detailed Jablonski diagram representing the energy level structure of NGQDs is derived.

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