Search results for "ZnO"
showing 10 items of 264 documents
Comparative Study on Micromechanical Properties of ZnO:Ga and ZnO:In Luminiscent Ceramics
2021
The research has been supported by the Project ERANET RUS_ST#2017-051(Latvia) and #18-52-76002 (Russia). The Institute of Solid State Physics, University of Latvia as the Centre of Excellence has received funding from the European Union’s Horizon 2020 Framework, Program H2020-WIDESPREAD-01-2016-2017-Teaming Phase 2 under grant agreement No. 739508, project CAMART2.
Rhodamine (B) photocatalysis under solar light on high crystalline ZnO films grown by home-made DC sputtering
2018
Abstract ZnO thin films were deposited by home-made DC sputtering of zinc target under mixed gases (Argon, Oxygen) plasma on glass substrates. Films were deposited by varying oxygen partial pressure (PO2) from 0.09 to 1.3 mbar in the deposition chamber, at a fixed substrate temperature of 100 °C. The samples were characterized by photoluminescence (PL), X-ray diffraction (XRD), optical transmissions (UV–vis), scanning electron microscopy (SEM) and electrical (Hall effect) measurements. The results indicate that by varying the oxygen pressure in the deposition chamber, the films show a precise and well defined photoluminescence emissions for each range of pressure covering almost the entire …
Current Spreading Length and Injection Efficiency in ZnO/GaN-Based Light-Emitting Diodes
2019
We report on carrier injection features in light-emitting diodes (LEDs) based on nonintentionally doped-ZnO/p-GaN heterostructures. These LEDs consist of a ZnO layer grown by chemical-bath deposition (CBD) onto a p-GaN template without using any seed layer. The ZnO layer (~1- $\mu \text{m}$ thickness) consists of a dense collection of partially coalesced ZnO nanorods, organized in wurtzite phase with marked vertical orientation, whose density depends on the concentration of the solution during the CBD process. Due to the limited conductivity of the p-GaN layer, the recombination in the n-region is strongly dependent on the spreading length of the holes, ${L}_{h}$ , coming from the p-contact…
On the solution of a parabolic PDE involving a gas flow through a semi-infinite porous medium
2021
Abstract Taking as start point the parabolic partial differential equation with the respective initial and boundary conditions, the present research focuses onto the flow of a sample of waste-water derived from a standard/conventional dyeing process. In terms of a highly prioritized concern, meaning environment decontamination and protection, in order to remove the dyes from the waste waters, photocatalyses like ZnO or TiO2 nanoparticles were formulated, due to their high surface energy which makes them extremely reactive and attractive. According to the basics of ideal fluid, the key point is the gas flow through an ideal porous pipe consisting of nanoparticles bound one to each other, for…
Sub-nanosecond excitonic luminescence in ZnO:In nanocrystals
2019
The financial support of research European Union ERA.NET RUS_ST20170-51 . This work was partly supported by Russian Foundation for Basic Research, Russia , project No. 18-52-76002 . The sample preparation was carried out as part of SFERA II project -Transnational Access activities ( European Union 7th Framework Programme Grant Agreement N3126430 ).
Wykorzystanie modelu PESO do pomiaru poziomu ekspozycji i zaangażowania w prowadzonych w mediach społecznościowych działaniach promocyjnych pośrednik…
2019
Rosnącej popularności mediów społecznościowych, towarzyszy wzrost znaczenia jakości i częstotliwości treści publikowanych w Internecie. Pociąga to za sobą ciągłą analizę między innymi z zakresu ekspozycji i zaangażowania internautów w mediach. Wśród wielu dostępnych narzędzi do przeprowadzenia powyższej analizy w niniejszej pracy wykorzystano model PESO – Dona Bartholomewa. Celem artykułu jest implementacja modelu PESO (pomiaru mediów społecznościowych na wielu poziomach) na rynku nieruchomości oraz analiza poziomu ekspozycji i zaangażowania w mediach społecznościowych pośredników w obrocie nieruchomościami. Celem szczegółowym jest analiza zawartości informacyjnej wpisów, materiałów wideo, …
Photoluminescent zinc oxide nanorods – a new tool for detection of human leukemic cells
2018
Nanoporainu anodēta alumīnija oksīdu saturošu vairākslāņu optisko pārklājumu sintēze un raksturošana
2021
Nanoporainu anodēta alumīnija oksīdu saturošu vairākslāņu optisko pārklājumu sintēze un raksturošana. Dutovs A., zinātniskie vadītāji prof. Dr. Chem., prof. Erts D. un vadošais pētnieks doc. Dr. Phys. Prikulis J. Konsultanti vadošais pētnieks Dr. Chem. Popļausks R. un pētnieks M.Sc. Biol. Maļinovskis U. Maģistra darbs, 49 lappuses, 21 attēls, 3 tabulas, 56 literatūras avoti. Latviešu valodā. Porains anodēts alumīnija oksīds ir optiski aktīva viela, uz kura pamatnes ir iespējams iegūt dažādus nanostrukturētus materiālus. Cinka oksīds, pateicoties savām izteiktajām fotoluminiscentām īpašībām, ir plaši pētīts pusvadītājs sensoru substrātu veidošanai. Cēlmetālu nanodaļiņu pārklāšana ar grafēnu …
Structural Properties and Temperature Behaviour of Optical Absorption Edge in Polycrystalline ZnO:X (Cu,Ag) Films
2013
Silver- and copper-doped ZnO lms were prepared by radio-frequency magnetron sputtering on glass substrates. The in uence of dopants content on the structural, morphological properties as well as on evolution of the optical absorption edge was considered. It has been found that Ag- and Cu-doped ZnO lms are characterized by wurtzite crystalline structure with the preferred direction of crystalline orientation (002). The sizes of grains within the lms were found to be dependent on the type of dopant. The temperature evolution of the optical absorption edge is described by the modi ed Urbach rule that re ects polycrystalline nature of the material. The corresponding parameters concerning electr…
Sb-implanted ZnO ultra-thin films
2017
Mild heating of the Zn(C5F6HO2)(2)center dot 2H(2)O center dot CH3(OCH2CH2)(2)OCH3 precursor allowed MOCVD deposition of ZnO films, in a low-pressure horizontal hot-wall reactor, on ITO substrates. The ZnO films were subsequently implanted with Sb ions. XRD measurements provided evidence that they consist of hexagonal, (002) and (101) oriented, crystals. UV-vis spectra showed that the transmittance of these films in the visible region is about 90%. The Sb implanted ZnO film showed a current-voltage characteristic that resembles that of a rectifying diode. This study represents the first example of Sb-implantation in ZnO films obtained by MOCVD.