scholarly journals Electrochemical Deposition of ZnS Films from Electrolyte Based on Na2SO3

2021 ◽  
Vol 57 (5) ◽  
pp. 20-26
Author(s):  
I.V. Demidenko ◽  
◽  
V.M. Ishimov ◽  
Keyword(s):  
Zinc Sulfide ◽  
Aqueous Electrolyte ◽  
Sodium Sulfite ◽  
Stoichiometric Composition ◽  
Electrochemical Process ◽  
Diffusion Limitations ◽  
Electrochemical Growth ◽  
Electrochemical Production ◽  
Sulfite Ion ◽  
Zns Films

The paper considers the features of electrochemical growth of zinc sulfide from an aqueous electrolyte based on sodium sulfite and zinc sulfate. The conditions for the electrochemical production of ZnS films are determined. It is shown that the value of the potential at which a ZnS layer is formed is limited by the achievement of the critical current due to the diffusion limitations of the electrochemical process of reducing the sulfite ion. It is shown that the resulting films contain an excess of sulfur, which is removed, and the stoichiometric composition is obtained by heat treatment. Aed mechanism of reactions resulting in the formation of zinc sulfide is proposed.

scholarly journals A comparison of different methods to remove dissolved oxygen: Application to the electrochemical determination of imidacloprid

2015 ◽  
pp. 149-155 ◽  
Author(s):  
Ana Djurovic ◽  
Zorica Stojanovic ◽  
Snezana Kravic ◽  
Zvonimir Suturovic ◽  
Tanja Brezo ◽  
...  
Keyword(s):  
Glassy Carbon ◽  
Chemical Method ◽  
Sodium Sulfite ◽  
Physical Method ◽  
Electrochemical Determination ◽  
Carbon Electrode ◽  
Nitrogen Stream ◽  
Sulfite Ion ◽  
Sulfite Solution

This study compares different methods for the removal of oxygen from the solution prior to the chronopotentiometric determination of the insecticide imidacloprid on glassy carbon electrode. The research included the application of the chemical method involving addition of sulfite ion, and the physical method of purging the sample with nitrogen stream, as well as their combination. By comparing analytical signals of imidacloprid, chemical method showed almost the same efficiency as conventional physical method, while the best reproducibility was achieved by applying chemical method with addition of the saturated sodium sulfite solution. The method is very simple and can be applied for deoxygenation of the solution prior to the chronopotentiometric analysis. The application of the chemical deoxygenation significantly shortened duration of the chronopotentiometric analysis of imidacloprid from approximately 15 min to 1 min.

Cold Deposition of Zinc Sulfide Optical Waveguides Using Thermoelectric Device

2011 ◽  
Vol 264-265 ◽  
pp. 856-861 ◽  
Author(s):  
Saafie Salleh ◽  
Harvey N. Rutt ◽  
M.N. Dalimin ◽  
Muhamad Mat Salleh
Keyword(s):  
Zinc Sulfide ◽  
Optical Waveguides ◽  
Thermoelectric Device ◽  
Force Microscopy ◽  
Prism Coupler ◽  
Atomic Force ◽  
Propagation Losses ◽  
Evaporation Technique ◽  
Scanning Detection ◽  
Zns Films

Zinc sulfide (ZnS) thin films as the waveguide medium have been deposited onto oxidized silicon wafer substrates at cold temperature (Tcold = –50oC) and ambient temperature (Tambient = 25oC) by thermal evaporation technique. The surface morphology of ZnS films were pictured with an atomic force microscopy (AFM) and the surface roughness were calculated from the AFM images. The propagation losses of the samples were measured using a scanning detection technique attached to a prism coupler. The AFM results revealed that the surface of cold deposited ZnS film is rougher than the surface of ambient deposited ZnS film. The propagation losses of the cold deposited ZnS waveguide are consistently lower than the ambient deposited ZnS waveguide at all measured wavelengths.

scholarly journals Treatment of real dairy wastewater by electrolysis and photo-assisted electrolysis in presence of chlorides

2019 ◽  
Vol 80 (5) ◽  
pp. 961-969 ◽  
Author(s):  
Diego Domingos Pereira de Sousa ◽  
Camila Ferreira Pinto ◽  
Marquele Amorim Tonhela ◽  
Ana Claudia Granato ◽  
Artur de Jesus Motheo ◽  
...  
Keyword(s):  
Advanced Oxidation Process ◽  
Treatment Time ◽  
Low Cost ◽  
Environmental Parameters ◽  
Electrochemical Process ◽  
Dairy Wastewater ◽  
23 Factorial Design ◽  
Legal Standards ◽  
Electrochemical Production ◽  
The Ideal

Abstract The efficiency of electrolysis (EC/Cl2) and photo-assisted electrolysis (EC/UV/Cl2) methods, in the presence of chloride, for the abatement of real dairy waste from a producer in the Triangulo Mineiro region of Brazil, was evaluated. A complete 23 factorial design was performed for the variables time, pH and current. After determining the ideal pH, a Central Compound Design (CCD) was performed, where the applied current (533.42 mA) and treatment time (60.45 minutes) were maximized. The effluent was subsequently submitted to prolonged EC/Cl2 and EC/UV/Cl2 treatment in order to evaluate the behaviour of specific environmental parameters over time. The EC/UV/Cl2 method was more efficient than simple EC/Cl2 treatment. The EC/UV/Cl2 method resulted in a reduction of all environmental parameters investigated to levels within legal standards for effluent discharge. A relatively low cost of treatment is obtained with Energy per Order (EEO) values of 0.89 and 1.22 kWh m−3 order−1 for the EC/UV/Cl2 and EC/Cl2 treatments, respectively. The electrochemical production of free chlorine species followed by subsequent photolysis and production of radical species can convert a simple electrochemical process into an advanced oxidation process (AOP).

scholarly journals A New Alternative Electrochemical Process for a Pre-Deposited UPD-Mn Mediated the Growth of Cu(Mn) Film by Controlling the Time during the Cu-SLRR

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 164
Author(s):  
Jau-Shiung Fang ◽  
Yu-Fei Sie ◽  
Yi-Lung Cheng ◽  
Giin-Shan Chen
Keyword(s):  
Film Growth ◽  
Atomic Layer ◽  
Open Circuit ◽  
Electrochemical Process ◽  
Layer Growth ◽  
Film Deposition ◽  
Layer By Layer ◽  
Cu Interconnects ◽  
Electrochemical Growth ◽  
Growth Method

A layer-by-layer deposition is essential for fabricating the Cu interconnects in a nanoscale-sized microelectronics because the gap-filling capability limits the film deposition step coverage on trenches/vias. Conventional layer-by-layer electrochemical deposition of Cu typically works by using two electrolytes, i.e., a sacrificial Pb electrolyte and a Cu electrolyte. However, the use of a Pb electrolyte is known to cause environmental issues. This study presents an Mn monolayer, which mediated the electrochemical growth of Cu(Mn) film through a sequence of alternating an underpotential deposition (UPD) of Mn, replacing the conventionally used UPD-Pb, with a surface-limited redox replacement (SLRR) of Cu. The use of the sacrificial Mn monolayer uniquely provides redox replacement by Cu2+ owing to the standard reductive potential differences. Repeating the sequence of the UPD-Mn followed by the SLRR-Cu enables Cu(Mn) film growth in an atomic layer growth manner. Further, controlling the time of open circuit potential (OCP) during the Cu-SLRR yields a technique to control the content of the resultant Cu(Mn) film. A longer OCP time caused more replacement of the UPD-Mn by the Cu2+, thus resulting in a Cu(Mn) film with a higher Cu concentration. The proposed layer-by-layer growth method offers a wet, chemistry-based deposition capable of fabricating Cu interconnects without the use of the barrier layer and can be of interest in microelectronics.

Surface and Capillary Forces Encountered by Zinc Sulfide Microspheres in Aqueous Electrolyte

Langmuir ◽  
2005 ◽  
Vol 21 (13) ◽  
pp. 5882-5886 ◽  
Author(s):  
Graeme Gillies ◽  
Michael Kappl ◽  
Hans-Jürgen Butt
Keyword(s):  
Zinc Sulfide ◽  
Aqueous Electrolyte ◽  
Capillary Forces

OPTIMIZATION PHOTODETECTORS FROM ZINC SULFIDE DEPOSITED ON POROUS SILICON WITH DIFFERENT DOPING METALS

2016 ◽  
Vol 24 (06) ◽  
pp. 1750086
Author(s):  
UDAY MUHSIN NAYEF ◽  
HAIDER AMER KHALAF
Keyword(s):  
Porous Silicon ◽  
Zinc Sulfide ◽  
Blue Shift ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Output Current ◽  
X Ray ◽  
Atomic Force ◽  
Current Value ◽  
Zns Films

In this work, the structural properties of the zinc sulfide (ZnS) films have been investigated using X-ray diffraction (XRD) analysis which show an enhancement in the crystallite degree after doping with copper (Cu). Good matching between the ZnS and porous silicon (PS) structure was noted from the atomic force microscope (AFM) results. The reflectivity gave a clear observation of anti-reflected coating improvement for PS layer and more enhancements after the ZnS deposition. The optical properties show a blue shift in the bandgap for the ZnS deposited with higher substrate temperature and a red shift after doped with different elements. For ZnS/PS heterojunction, the electrical resistivity has been increased after PS layer formed and changed with the variation of the pore size and it was much higher after ZnS deposited on the PS. However, use of ZnS:Cu/PS photodetector showed much higher output current at the ultraviolet (UV) region compared to ZnS/PS. The ZnS:Cu/PS photodetector showed higher output current value than that of the ZnS/PS leading to improvement in the quantum efficiency of 42%.

Selective Electrochemical Production of Formate from Carbon Dioxide with Bismuth-Based Catalysts in an Aqueous Electrolyte

ACS Catalysis ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 931-937 ◽  
Author(s):  
Chan Woo Lee ◽  
Jung Sug Hong ◽  
Ki Dong Yang ◽  
Kyoungsuk Jin ◽  
Jun Ho Lee ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Electrolyte ◽  
Electrochemical Production
Sign in / Sign up

Export Citation Format

Share Document