nanosized zno
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Doklady BGUIR ◽  
2022 ◽  
Vol 19 (8) ◽  
pp. 10-14
Author(s):  
A. A. Kuraptsova ◽  
A. L. Danilyuk

Silicon/zinc oxide heterostructures have shown themselves to be promising for use in photovoltaics. This paper presents the results of modeling the charge properties and currents in a Si/nanosized ZnO particle with different types of conductivity under sunlight irradiation. The simulation was carried out using the Comsol Multiphysics software package. The energy diagrams of the investigated heterostructures were plotted, the charge properties and currents flowing in the structure were investigated, the dependences of the rate of generation of charge carriers on wavelength on the surfaces of silicon, zinc oxide, and at the interface between silicon and zinc oxide, the rate of recombination of charge carriers at various wavelengths of incident radiation was obtained. The regularities of the influence of wavelength of the incident radiation on the charge density and electric potential on the surface of heterostructures have been established. It is shown that the potential on the surface of the p-Si / n-ZnO heterostructure is positive, depends on the wavelength of the incident radiation and reaches the maximum of 0.68 V. For other structures, it is negative and does not depend on the wavelength: n-Si / p-ZnO –0.78 V, p-Si / p-ZnO –0.65 V, n-Si / n-ZnO –0.25 V.


Author(s):  
Elena V. Tomina ◽  
Anna A. Pavlenko ◽  
Aleksandr I. Dmitrenkov ◽  
Sofiya A. Neminushchaya

The aim of the study was to synthesise a ZnO/silver birch wood (Bétula péndula) nanocomposite and evaluate its physical and mechanical properties in comparison with an unmodified natural polymer.Using the sol-gel method, we synthesised almost spherical impurity-free zinc oxide nanoparticles with a predominant particle size of about 20 nm. Amorphous hydrated Zn(OH)2 was impregnated into the wood material at the gel formation stage. It resulted in the reaction of zinc hydroxide decomposition with the formation of ZnO nanoparticles in the wood as a nanoreactor.The hydrophobic properties of the surface of ZnO/silver birch wood nanocomposite improved significantly (the contact angle of wetting doubled). Its moisture and water resistance decreased (2-5 times and 30%, respectively). The nanocomposite also showed less swelling in the radial (8-10 times) and tangential (2.6-10 times) directions in comparison with natural wood.


2021 ◽  
Vol 262 ◽  
pp. 124279
Author(s):  
Hai Sun ◽  
Ming Nie ◽  
Zhenhong Xue ◽  
Jin Luo ◽  
Ying Tang ◽  
...  

Polyhedron ◽  
2021 ◽  
Vol 197 ◽  
pp. 115022
Author(s):  
N.M. Alatawi ◽  
L. Ben Saad ◽  
L. Soltane ◽  
A. Moulahi ◽  
I. Mjejri ◽  
...  

2021 ◽  
Vol 21 (3) ◽  
pp. 1897-1903
Author(s):  
Jung-Hwan Lee ◽  
Gun-Sub Lee ◽  
Eung-Nam Park ◽  
Sung-Eun Hong ◽  
Sung-Bong Kye ◽  
...  

In this study, a [0001]-plane planar-type ZnO ceramic powder material with a high aspect ratio ranging from 20:1–50:1 is synthesized using the electrolyte collected from zinc air battery power generation. This high aspect ratio may be due to the Zn(OH)2-4 anion dissolved in the electrolyte. The obtained planar-type ZnO exhibits excellent formulation stability and applicability, even when formulated as a cosmetic with a single inorganic ingredient. Compared to commercial ZnO or TiO2 powders, relatively better protection against infrared and ultraviolet (UV) radiation is realized due to its asymmetric characteristics, with a width of approximately 1 μm and thickness of tens of nm. The synthesized planar-type ZnO is mixed with nanosized ZnO or TiO2 commercial powders and formulated into various combinations to achieve a high UV protection rate and heat-blocking effect. In particular, the addition of planar-type ZnO to nanosized TiO2 powders increases the heat-blocking effect, and improves the applicability and formulation stability of the cosmetic formulation, despite the decrease in turbidity. Among all the ceramic powder combinations examined in this study, the best UV protection rate and heat-blocking effect are obtained when the synthesized planar-type ZnO is mixed with microsized and nanosized TiO2.


2021 ◽  
Vol 1762 (1) ◽  
pp. 012029
Author(s):  
B Martinov ◽  
S Slavov ◽  
A Staneva ◽  
D Dimitrov ◽  
J Mateeva

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