Effect of barium salt on deposition kinetics, morphology and composition of chemically precipitated PbS films

Thin films of lead sulfide obtained by various physicochemical methods are widely used as IR detectors, ion-selective sensors, sensors of temperature and humidity, in solar radiation converters due to a high absorption coefficient in the infrared spectrum of 1-3 μm. Researchers note technological simplicity, the absence of high temperatures and vacuum, as well as the possibility of light doping of lead sulfide films during their production by chemical bath deposition from aqueous media. In the present work, we studied the kinetics of hydrochemical deposition of the solid PbS phase from the ammonium citrate reaction mixture. The introduction of barium chloride BaCl2 into the reactor in the concentration range from 0.5∙10-5 to 5∙10-3 mol/l has led to an increase in the induction deposition period from 5 to 30 minutes. In this work, polycrystalline films of individual lead sulfide were synthesized, as well as PbS layers doped with iodine and additionally barium with salt content in the last mixtures from 0.5∙10-5 to 5∙10-3 mol/l. The film thickness varied from 350 to 210 nm. An elemental EDX analysis of the obtained PbS films was performed. For the main components contained in the layers (Pb and S), insignificant non-stoichiometry in composition was established. The morphology of films of PbS during their doping with iodine and barium undergoes significant changes. Thus, if an individual PbS is formed from particles whose average size is 250 nm, then introduction of ammonium iodide into the solution leads to the appearance of grains with an average size of 150-200 nm, and adding the barium salt results a slight increase in the grain size up to 150-300 nm. The share of nanoparticles in these layers is 1-4%. The histograms of the distribution of particles in the films, both for individual and doped PbS, are monomodal.

Formation of pressurizable hydrogel-based vascular tissue models by selective gelation in composite PDMS channels

A new approach for the preparation of vascular tissue models in PDMS-based composite channel structures embedded with barium salt powders.

Study on the Discharge Performance that the High Barium Ferrite as the Electrochemical Properties of Super-Iron Battery Cathode Active Material

The super-iron battery has a green, voltage stability and high-energy characteristics, but the stability is one of the key issues restricting its development. We select high barium ferrite as the active material of the cathode material, research on the stability of sodium silicate (Na 2 SiO 3 · 9H 2 O) and potassium permanganate (KMnO 4) as synthetic additives, the battery and its discharge properties. The study showed that the adding 0.2g sodium silicate barium salt of battery has a high discharge voltage and discharge energy, which is greater than the output current, made for 86.89% of the total power of the electric power made by the discharge voltage of 1.4 volts. While adding 0.4 g of sodium silicate barium salt of the battery having a relatively flat discharge platform and a high discharge capacity, which is larger than the discharge voltage of 1.2 volts, the output capacitor accounts for the total output capacity of 93.3%; adding potassium permanganate, barium salt battery compared with no additives barium salt battery discharge voltage of 1.4 volts, 91% of the total capacity of the discharge capacity, discharge energy to the total energy of 93.4%. The modified alkaline high barium ferrite batteries (Zn / BaFeO 4) suitable for high current discharge voltage and stable work occasions.