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 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.

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).

Towards scalable synthesis of high-quality PbS colloidal quantum dots for photovoltaic applications

2019 ◽  
Vol 7 (6) ◽  
pp. 1575-1583 ◽  
Author(s):  
Sijie Zhou ◽  
Zeke Liu ◽  
Yongjie Wang ◽  
Kunyuan Lu ◽  
Fan Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Colloidal Quantum Dots ◽  
High Yield ◽  
High Quality ◽  
Excellent Quality ◽  
Photovoltaic Applications ◽  
Photovoltaic Technology ◽  
Scalable Synthesis ◽  
Large Scale Manufacture

Accelerating inorganic nanocrystal-based photovoltaic technology needs more efficient synthetic protocols for large scale manufacture, high yield and excellent quality nanocrystal materials.

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.

Theory and Manufacturing Processes of Solar Nanoantenna Electromagnetic Collectors

2010 ◽  
Vol 132 (1) ◽  
Author(s):  
D. K. Kotter ◽  
S. D. Novack ◽  
W. D. Slafer ◽  
P. J. Pinhero
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
Cost Effective ◽  
Optical Antenna ◽  
Technological Barriers ◽  
Large Scale Manufacture ◽  
Future Work ◽  
Optical Behavior ◽  
Effective Proof ◽  
Selection Of

The research described in this paper explores a new and efficient approach for producing electricity from the abundant energy of the sun, using nanoantenna (nantenna) electromagnetic collectors (NECs). NEC devices target midinfrared wavelengths, where conventional photovoltaic (PV) solar cells are inefficient and where there is an abundance of solar energy. The initial concept of designing NECs was based on scaling of radio frequency antenna theory to the infrared and visible regions. This approach initially proved unsuccessful because the optical behavior of materials in the terahertz (THz) region was overlooked and, in addition, economical nanofabrication methods were not previously available to produce the optical antenna elements. This paper demonstrates progress in addressing significant technological barriers including: (1) development of frequency-dependent modeling of double-feedpoint square spiral nantenna elements, (2) selection of materials with proper THz properties, and (3) development of novel manufacturing methods that could potentially enable economical large-scale manufacturing. We have shown that nantennas can collect infrared energy and induce THz currents and we have also developed cost-effective proof-of-concept fabrication techniques for the large-scale manufacture of simple square-loop nantenna arrays. Future work is planned to embed rectifiers into the double-feedpoint antenna structures. This work represents an important first step toward the ultimate realization of a low-cost device that will collect as well as convert this radiation into electricity. This could lead to a broadband, high conversion efficiency low-cost solution to complement conventional PV devices.

scholarly journals Environment-dependent Emission Tuning in the Multicolor Nitrogen-doped Carbon Quantum Dots

2021 ◽  
Author(s):  
Dineshkumar Sengottuvelu ◽  
Abdul Kalam Shaik ◽  
Satish Mishra ◽  
Mahsa Abbaszadeh ◽  
Nathan Hammer ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Large Scale ◽  
Low Cost ◽  
Visible Region ◽  
Carbon Quantum Dots ◽  
One Pot ◽  
Nitrogen Doped ◽  
Emission Changes ◽  
Nitrogen Doped Carbon

Carbon quantum dots (CQDs) are fascinating luminous materials from the carbonaceous family and are increasingly being investigated in many optoelectronic applications due to their unique photoluminescence (PL) characteristics. Herein, we report the synthesis of nitrogen-doped carbon quantum dots (NCQDs) from citric acid and m-phenylenediamine using a one-pot hydrothermal approach. The environment-dependent emission changes of NCQDs were extensively investigated in various solvents, in solid-state, and in physically assembled PMMA-PnBA-PMMA copolymer gels in 2-ethyl hexanol. The NCQDs display bright emission in various solvents as well as in solid-state and a temperature-dependent enhanced emission in gels. In detail, these NCQDs exhibit multicolor PL emission across the visible region and its enhancement upon changing the environment (solutions and polymer matrices). The NCQDs also exhibit excitation-dependent PL and solvatochromism, which are rarely observed in CQDs. Most CQDs are non-emissive in the aggregated or solid-state due to the aggregation-caused quenching (ACQ) effect, limiting their solid-state applications. However, these NCQDs display a strong solid-state emission centered at 568 nm ascribed to the presence of abundant surface functional groups, which helps to prevent the - interaction between the NCQDs and to overcome the ACQ effect in the solid-state. Interestingly, the NCQD containing gels display a significant fluorescence enhancement than the NCQDs in 2-ethyl hexanol solution because of the interaction between the polar PMMA blocks and NCQDs. This research opens up the development of large-scale, low-cost multicolor phosphor for the fabrication of optoelectronic devices, sensing, and bioimaging applications.

scholarly journals Facile and Novel in-Plane Structured Graphene/TiO2 Nanocomposites for Memory Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
E. M. Shehata ◽  
M. M. Ibrahim ◽  
M. R. Balboul
Keyword(s):  
Thin Films ◽  
Large Scale ◽  
Low Cost ◽  
Charge Trapping ◽  
Average Crystallite Size ◽  
Rietveld Analysis ◽  
Scale Production ◽  
Simple Strategy ◽  
Large Scale Production ◽  
Memory Applications

Here, we report a simple strategy for the preparation of graphene/TiO2 nanocomposite by UV-assisted incorporation of TiO2 nanosol in graphene oxide (GO) dispersion. The proposed method is facile and of low cost without using any photocatalysts or reducing agents; this can open up a new possibility for green preparation of stable graphene dispersions in large-scale production. X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy (TEM) have been used to characterize carefully the as-prepared composites and to confirm the successful preparation of the nanocomposites. The average crystallite size of TiO2 nanoparticles calculated from XRD pattern using Rietveld analysis is ~35 nm. TEM measurements show the adsorption of TiO2 onto graphene (G) sheets, which prevents the restacking of graphene sheets. Current-voltage and capacitance-voltage measurements were used to investigate the electrical resistive memory properties of GO, GO/TiO2, and G/TiO2 thin films. Observed results show hysteresis behavior due to the charge trapping and detrapping process, indicating that the prepared thin films exhibit an excellent resistance switching memory characteristic for G/TiO2 device.

Low cost and large scale synthesis of PbS quantum dots with hybrid surface passivation

CrystEngComm ◽  
2017 ◽  
Vol 19 (6) ◽  
pp. 946-951 ◽  
Author(s):  
Zhen Huang ◽  
Guangmei Zhai ◽  
Zhiming Zhang ◽  
Changwang Zhang ◽  
Yong Xia ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Surface Passivation ◽  
Low Cost ◽  
Large Scale Synthesis ◽  
Pbs Quantum Dots
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