scholarly journals Photoconversion Fluoropolymer Films for the Cultivation of Agricultural Plants Under Conditions of Insufficient Insolation

2020 ◽  
Vol 10 (22) ◽  
pp. 8025
Author(s):  
Alexander V. Simakin ◽  
Veronika V. Ivanyuk ◽  
Alexey S. Dorokhov ◽  
Sergey V. Gudkov
Keyword(s):  
Quantum Dots ◽  
Visible Spectrum ◽  
Biomass Growth ◽  
High Latitudes ◽  
Great Demand ◽  
Agricultural Plants ◽  
Fluoropolymer Films ◽  
Violet Radiation

Plants are capable of using mainly the quanta of the red and blue parts of a spectrum for the reception of energy during photosynthesis. However, for many crops grown indoors in high latitudes or under conditions of insufficient insolation, the average daily intensity of the red and blue parts of the spectrum is usually sufficient only on clear summer days. A technology has been proposed to produce a photoconversion fluoropolymer film for greenhouses, which is based on the modification of fluoropolymer by nanoparticles with fluorescence in the blue or red part of the spectrum (quantum dots). The films are capable of converting UV and violet radiation into the blue and red region of the visible spectrum, the most important for plants. It has been shown that the use of photoconversion fluoropolymer films promotes biomass growth. The area of cucumber leaves grown under photoconversion films increases by 20%, pumpkins by 25%, pepper by 30%, and tomatoes by 55%. The use of photoconversion fluoropolymer films for greenhouses also allows obtaining 15% more fruit biomass from one bush. In general, the use of photoconversion fluoropolymer films may be in great demand for greenhouses lying in high latitudes and located in areas with insufficient insolation.

scholarly journals Influence of Fluoropolymer Film Modified With Nanoscale Photoluminophor on Growth and Development of Plants

2020 ◽  
Vol 8 ◽  
Author(s):  
Veronika V. Ivanyuk ◽  
Alexey V. Shkirin ◽  
Konstantin N. Belosludtsev ◽  
Mikhail V. Dubinin ◽  
Valeriy A. Kozlov ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Growth And Development ◽  
Optical Spectrum ◽  
Red Light ◽  
High Latitudes ◽  
Tomato Plants ◽  
Violet Light ◽  
Northern Latitudes ◽  
Plant Photosynthesis ◽  
Fluoropolymer Films

The red and blue ranges of the optical spectrum are most suitable for plant photosynthesis. Moreover, quanta of red light stimulate photosynthesis more than quanta of blue light. In northern latitudes, the average daily intensity of the red and blue parts of the spectrum is usually not sufficient for many plants. To increase the productivity of greenhouses in northern latitudes, a technology has been developed for fluoropolymer films with photoconversion nanoparticles (quantum dots) that convert UV radiation and violet light into red light. The use of photoconversion fluoropolymer films promotes an increase in the biomass of plants grown in greenhouses at high latitudes. The greatest effect is observed when tomato plants are grown under photoconversion fluoropolymer films. The biomass of tomato berry obtained from one bush grown under films is 20% higher than the biomass of berry of control tomato plants.

scholarly journals Microwave Assisted Phytosynthesis and Characterization of Magnetic Iron Oxide Quantum Dots using Moringa oleifera

2018 ◽  
Vol 15 (2) ◽  
pp. 145-150 ◽  
Author(s):  
G. Deepthi Reddy ◽  
M. Noorjahan ◽  
K.Girija Mangatayaru ◽  
M. Krishnakanth
Keyword(s):  
Quantum Dots ◽  
Iron Oxide ◽  
Moringa Oleifera ◽  
Structural Characteristics ◽  
Aqueous Media ◽  
Diffraction Method ◽  
Visible Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetic Iron Oxide

Magnetic Iron Oxide Quantum Dots (MIOQDs) were synthesized using Moringa oleifera leaves through green technique i.e., Microwave treatment. The synthetic method is highly rapid, simple and economical. MIOQDs were formed by reduction of ferric chloride (FeCl3) solution with Moringa oleifera leaf extract without any influence of alkaline conditions which opens a new arena for the phytosynthesis of nanoparticles. MIOQDs structural characteristics were scrutinized by Powder X-ray diffraction method, FESEM, TEM, UV –Visible Spectroscopy, Photoluminescence Emission Spectroscopy. The ultraviolet-visible spectrum recorded for the aqueous media iron nanoparticles showed an absorption peak at around 330 nm. Powder X-ray diffraction showed that the particles are crystalline in nature, with both hematite and maghemite structure.

ChemInform Abstract: A Facile Route to Aqueous Ag:ZnCdS and Ag:ZnCdSeS Quantum Dots: Pure Emission Color Tunable over Entire Visible Spectrum.

ChemInform ◽  
2015 ◽  
Vol 46 (22) ◽  
pp. no-no
Author(s):  
Ruosheng Zeng ◽  
Zhiguo Sun ◽  
Sheng Cao ◽  
Rongan Shen ◽  
Zuoji Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Spectrum ◽  
Emission Color ◽  
Color Tunable ◽  
Entire Visible Spectrum ◽  
Facile Route

A facile route to aqueous Ag:ZnCdS and Ag:ZnCdSeS quantum dots: Pure emission color tunable over entire visible spectrum

2015 ◽  
Vol 632 ◽  
pp. 1-9 ◽  
Author(s):  
Ruosheng Zeng ◽  
Zhiguo Sun ◽  
Sheng Cao ◽  
Rongan Shen ◽  
Zuoji Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Spectrum ◽  
Emission Color ◽  
Color Tunable ◽  
Entire Visible Spectrum ◽  
Facile Route

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.

CdSe self-assembled quantum dots with ZnCdMgSe barriers emitting throughout the visible spectrum

2004 ◽  
Vol 85 (26) ◽  
pp. 6395-6397 ◽  
Author(s):  
M. Noemi Perez-Paz ◽  
Xuecong Zhou ◽  
Martin Muñoz ◽  
Hong Lu ◽  
Mohammad Sohel ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Spectrum ◽  
Self Assembled

GaN and GaInN quantum dots: an efficient way to get luminescence in the visible spectrum range

2000 ◽  
Vol 164 (1-4) ◽  
pp. 241-245 ◽  
Author(s):  
B. Damilano ◽  
N. Grandjean ◽  
J. Massies ◽  
F. Semond
Keyword(s):  
Quantum Dots ◽  
Visible Spectrum ◽  
Spectrum Range
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