scholarly journals Inkjet-Printed CdTe Quantum Dots-Polyurethane Acrylate Thin Films

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Lei Du ◽  
Zhejun Liu ◽  
Suhua Jiang
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Water Content ◽  
Large Scale ◽  
Low Cost ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Flexible Displays ◽  
Uv Curable ◽  
Polyurethane Acrylate

We demonstrated the inkjet-printed CdTe quantum dots-polyurethane acrylate thin films and their potential application in the display devices. The water soluble CdTe QDs were synthesized through the wet chemistry and the emission wavelengths can be freely tuned during the preparation process. Combining with the UV curable resin polyurethane acrylate, the QDs inks were prepared and the influence of diluent and water content on the performance of resultant films was studied. The tensile stress of the films cured from the QDs inks with diluent increased from 10.6 MPa to 27.5 MPa and the low water content led to uniform polymer matrix. Furthermore, the existence of diluent and low water content would all improve the fluorescence stability of the thin films. Finally, the thin films can be deposited on different substrates and well controlled to meet the RGB color standard, which will pave the way to a simple, low-cost, large-scale, and highly reliable method for the application of flexible displays.

scholarly journals Green Preparation of Fluorescent Carbon Quantum Dots from Cyanobacteria for Biological Imaging

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 616 ◽  
Author(s):  
Xi Wang ◽  
Pei Yang ◽  
Qian Feng ◽  
Taotao Meng ◽  
Jing Wei ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Source ◽  
Large Scale ◽  
Low Cost ◽  
Average Diameter ◽  
Carbon Quantum Dots ◽  
Water Soluble ◽  
High Concentration ◽  
Wide Range ◽  
Low Cytotoxicity

Biomass-based carbon quantum dots (CQDs) have become a significant carbon materials by their virtues of being cost-effective, easy to fabricate and low in environmental impact. However, there are few reports regarding using cyanobacteria as a carbon source for the synthesis of fluorescent CQDs. In this study, the low-cost biomass of cyanobacteria was used as the sole carbon source to synthesize water-soluble CQDs by a simple hydrothermal method. The synthesized CQDs were mono-dispersed with an average diameter of 2.48 nm and exhibited excitation-dependent emission performance with a quantum yield of 9.24%. Furthermore, the cyanobacteria-derived CQDs had almost no photobleaching under long-time UV irradiation, and exhibited high photostability in the solutions with a wide range of pH and salinity. Since no chemical reagent was involved in the synthesis of CQDs, the as-prepared CQDs were confirmed to have low cytotoxicity for PC12 cells even at a high concentration. Additionally, the CQDs could be efficiently taken up by cells to illuminate the whole cell and create a clear distinction between cytoplasm and nucleus. The combined advantages of green synthesis, cost-effectiveness and low cytotoxicity make synthesized CQDs a significant carbon source and broaden the application of cyanobacteria and provide an economical route to fabricate CQDs on a large scale.

Growth of Perovskite Nanorods from PbS Quantum Dots

MRS Advances ◽  
2018 ◽  
Vol 3 (32) ◽  
pp. 1843-1848 ◽  
Author(s):  
José Maria C. da Silva Filho ◽  
Francisco C. Marques
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Large Scale ◽  
Low Cost ◽  
Visible Spectrum ◽  
Lead Iodide ◽  
Lead Sulphide ◽  
Flat Film ◽  
Direct Band ◽  
Large Scale Manufacture

ABSTRACTOrganolead iodide perovskites, CH3NH3PbI3, have attracted the attention of researchers around the world due to their optical and electrical properties. Their main characteristics include, direct band-gap (1.4 to 3.0 eV), large absorption coefficient in the visible spectrum, long carrier diffusion length and ambipolar charge transport. Aside that, perovskite thin films can be produced with low cost and are compatible with large-scale manufacture. Perovskite thin films have been synthesized mainly by spin-coating technique and thermal evaporation, which can be executed in one or two steps. Aiming to increase the light absorption, nanostructured perovskite thin films are also under intense study, since the nanostructures can absorb more light than a flat film. Thus, in this work, we reported the synthesis of perovskite (CH3NH3PbI3) nanorods by means of conversion of lead sulphide quantum dots (PbSQD). The perovskite nanorods were grown by exposing the PbSQD to a highly concentrated iodine atmosphere and then dipping the resulting film in methylammonium iodide (CH3NH3I) solution. The first step converts completely the PbSQD into lead iodide (PbI2) nanowires, ≈50 µm long and ≈200 nm diameter, through substitution of sulphur by iodine atoms and subsequent aggregation of the particles. The later step converts the PbI2 nanowires in perovskite nonorods (≈5 µm long and ≈400 nm diameter). The perovskite nanorods present a regular geometry along all its length. A preferential alignment of nanorods to the substrate plane was observed. The preliminary results show that we can control the size of nanorods through exposition time of PbSQD to iodine, which change the size of PbI2 nanowire as well. The conversion process was studied by x-ray diffraction, optical absorption, photoluminescence and scanning electron microscopy.

scholarly journals CdTe Quantum Dots Modified with Cysteamine: A New Efficient Nanosensor for the Determination of Folic Acid

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4548 ◽  
Author(s):  
Doris E. Ramírez-Herrera ◽  
Ana Patricia Reyes-Cruzaley ◽  
Giselle Dominguez ◽  
Francisco Paraguay-Delgado ◽  
Antonio Tirado-Guízar ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Folic Acid ◽  
Fluorescence Quenching ◽  
Low Cost ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Photoluminescence Intensity ◽  
Beverage Samples ◽  
Cdte Qds

In this paper, we report the synthesis, characterization, and application of a new fluorescent nanosensor based on water-soluble CdTe quantum dots (QDs) coated with cysteamine (CA) for the determination of folic acid (FA). CdTe/CA QDs were characterized by high-resolution transmission electron microscopy, the zeta potential, and Fourier-transform infrared (FT-IR), UV-visible, and fluorescence spectroscopy. CdTe QDs coated with mercaptopropionic acid (MPA) and glutathione (GSH) were prepared for comparison purposes. The effect of FA on the photoluminescence intensity of the three thiol-capped QDs at pH 8 was studied. Only CdTe/CA QDs showed a notable fluorescence quenching in the presence of FA. Then, a nanosensor based on the fluorescence quenching of the CdTe QDs at pH 8 was explored. Under optimum conditions, the calibration curve showed a linear fluorescence quenching response in a concentration range of FA from 0.16 to 16.4 μM (R2 = 0.9944), with a detection limit of 0.048 μM. A probable mechanism of fluorescence quenching was proposed. The nanosensor showed good selectivity over other possible interferences. This method has been applied for FA quantification in orange beverage samples with excellent results (recoveries from 98.3 to 103.9%). The good selectivity, sensitivity, low cost, and rapidity make CdTe /CA QDs a suitable nanosensor for FA determination.

Enhanced photocatalytic activities of TiO2 nanocomposites doped with water-soluble mercapto-capped CdTe quantum dots

2010 ◽  
Vol 101 (1-2) ◽  
pp. 118-129 ◽  
Author(s):  
Yue-Sheng Li ◽  
Feng-Lei Jiang ◽  
Qi Xiao ◽  
Ran Li ◽  
Kan Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Photocatalytic Activities

Rapid determination of melamine in milk using water-soluble CdTe quantum dots as fluorescence probes

2011 ◽  
pp. 1-12 ◽  
Author(s):  
Minwei Zhang† ◽  
Hong Ping† ◽  
Xianyi Cao ◽  
Hongkun Li ◽  
Fengrui Guan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Rapid Determination ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Fluorescence Probes

Low-cost and large-scale synthesis of CuInS2 and CuInS2/ZnS quantum dots in diesel

2014 ◽  
Vol 37 ◽  
pp. 823-827 ◽  
Author(s):  
Nguyen Thi Minh Thuy ◽  
Tran Thi Kim Chi ◽  
Ung Thi Dieu Thuy ◽  
Nguyen Quang Liem
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Low Cost ◽  
Large Scale Synthesis

Solution-phase deposition of SnS thin films via thermo-reduction of SnS2

2018 ◽  
Vol 54 (16) ◽  
pp. 1992-1995 ◽  
Author(s):  
Yixin Dong ◽  
Gangri Cai ◽  
Qi Zhang ◽  
Hui Wang ◽  
Zhe Sun ◽  
...  
Keyword(s):  
Thin Films ◽  
Large Scale ◽  
Low Cost ◽  
Solution Phase ◽  
Sns Thin Films

Here, we demonstrate a novel solution-based route for deposition of tin monosulfide (SnS) thin films, which are emerging, non-toxic absorber materials for low-cost and large-scale PV applications, via thermo-reducing Sn(iv) to Sn(ii).

Investigation on the Photoinduced Interaction Between Water Soluble CdTe Quantum Dots and Certain Antioxidants

2011 ◽  
Vol 4 (11) ◽  
pp. 3490-3495 ◽  
Author(s):  
Mariadoss Asha Jhonsi ◽  
Ellappan Vaishnavi ◽  
Raja Suganya ◽  
Arunkumar Kathiravan ◽  
Rajalingam Renganathan
Keyword(s):  
Quantum Dots ◽  
Water Soluble ◽  
Cdte Quantum Dots

scholarly journals Structural, optical, and electrical properties of thioglycolic acid-capped CdTe quantum dots thin films

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Rostam Moradian ◽  
Mohammad Elahi ◽  
Ahmad Hadizadeh ◽  
Mahmoud Roshani ◽  
Atefeh Taghizadeh ◽  
...  
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Electrical Properties ◽  
Thioglycolic Acid ◽  
Cdte Quantum Dots ◽  
Optical And Electrical Properties

Fluorescence Properties of Hybrid CdTe Quantum Dots-Porphyrins Thin Films in Organic Vapors

2010 ◽  
Author(s):  
Norhayati Abu Bakar ◽  
Aidhia Rahmi ◽  
Akrajas Ali Umar ◽  
Muhamad Mat Salleh ◽  
Muhammad Yahaya ◽  
...  
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Cdte Quantum Dots ◽  
Fluorescence Properties ◽  
Organic Vapors
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