Various methods of synthesis of CuInSe
2
remain relevant because it is one of the most effective materials for solar energy. An effective method for the preparation of the CuInSe
2
nanodispersed ...selenium precursor for microwave synthesis is considered. Colloidal selenium solutions were obtained using laser ablation in various liquid media: water, ethanol, triethylene glycol, polyethylene glycol–400 (PEG-400), and a 1% solution of PEG-1500 in PEG-400. The optical properties of the obtained colloidal selenium solutions were studied. Electron microscopy of selenium particles was conducted. Trends of ablation rate change and physicochemical properties of dispersed selenium particles in the variety of liquid media listed above are discussed. The possibility of synthesizing CuInSe
2
using the obtained precursor was verified.
•Laser method for synthesis of bimetallic materials for enzyme-free microbiosensors.•Relationship between the structure of complexes and the properties of microbiosensors is shown.•The gap in ...knowledge about the structure of bimetal wine complexes has been filled.
The use of laser methods for synthesizing new materials for non-enzymatic electrochemical microsensors for express analysis of biological fluids is a promising scientific question.
Laser-induced chemical liquid phase deposition is the laser deposition of invisible miniature bimetallic deposits from aqueous solutions of salts and complexes of transition metals. Bimetallic complexes containing two transition metal cations in the shell of one ligand are of increased interest. There is an information gap in this area even for ligands such as tartrate. The studies carried out make it possible to obtain new information on the structure of bimetallic tartaric complexes in solutions containing simultaneously copper, nickel, silver, iron, and cobalt.
Laser-induced deposition of metals from a solution has been used as a new method for the synthesis of microcomposite materials in the copper-silver system. It was shown that the obtained materials ...have good sensory properties with respect to the determination of
d
-glucose in aqueous solutions. It is also shown that it can be used for gas sensors. Control of sensory properties can be done by changing the method of deposition. X-ray diffraction, EDX, and impedance spectroscopy were used to characterize the materials obtained and it was shown that laser sequential deposition and coprecipitation of two metals give different results. An explanation of the results was proposed. It explains them by the eutectic nature of the interaction in the copper-silver system.
The synthesis of copper nanostructures from solutions in the presence of oxidizing additives on the surface of opaque and transparent substrates was performed upon laser irradiation at 532nm. Organic ...alcohols such as ethanol and ethylene glycol were used as the reducing agents whereas potassium bromate was employed in order to demonstrate the influence of inorganic oxidizing additives on the process of the copper laser-induced synthesis from aqueous solutions. The presence of these additives increases the copper deposition rate during the synthesis which is a grand challenge of implementation of laser-induced liquid-phase metal deposition technique. The scanning electron microscopy, energy-dispersive analysis and impedance spectroscopy reveal that the synthesized copper structures from solutions containing potassium bromate composed of densely agglomerated nanocrystals.
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•High rate laser-induced deposition of copper nanostructures was performed.•The presence of low-molecular-weight alcohols and potassium bromate additives increases the copper deposition rate.•The deposited copper structures composed of densely agglomerated nanocrystals.•A continuous high-quality copper-containing nanostructure was deposited on POLIKOR VK-96 at the scanning speed of 10μms−1.•A continuous highly conductive copper nanostructure was deposited on oxide glass at the scanning speed of 25μms−1.
•The possibility of using Raman spectroscopy for dating a document is shown.•A procedure for the mathematical processing of spectra for dating is proposed.•The choice of components of the PCA spectra ...is justified.•The most effective dating method is to represent the dating in coordinates PC3–PC5.
The use of spectral analysis methods to determine the age of writing inks is an important forensic task. However, the use of spectral data for this purpose has a number of limitations and difficulties. This paper considers the application of the Raman spectroscopy method to an urgent forensic task. The known mechanisms of dye degradation are analyzed; Raman bands are identified that are related to the age of the sample. In a sample of 5 randomly selected writing inks, temporary markers were identified. Narrow sections of Raman spectra containing characteristic lines were used for analysis. It was shown that processing narrow sections of the Raman spectra using the PCA chemometric method allowed the separation of writing inks into groups (clusters) corresponding to different creation intervals.
•Non-ionic surfactant influence on the process of laser-induced copper deposition was studied.•It was found that the non-ionic surfactant improves the topology of deposited copper conductors.•A ...mechanism for the surfactant influence on the deposition process was proposed.
We describe the laser-induced chemical liquid phase deposition of copper using a solution containing a non-ionic surfactant on substrates comprising either an oxide glass or a glass-ceramic Sitall. Our results demonstrate that the addition of the surfactant to the deposition solution results in improved structural topology in the deposited copper layer. Our data confirm that the use of a non-ionic surfactant can reduce the negative influence of gas formation during the deposition process.
The advantages of automated systems for magnetic inductive incoming quality control of raw materials of large metallurgical enterprises are demonstrated. Environmental risks under the existing visual ...control system were assessed.
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► Copper lines were deposited on the surface of ceramics using sorbitol. ► Sorbitol as a reductant leads to deposition of conductive copper lines. ► Topology of deposits was studied ...by SEM and scanning probe microscopy. ► Elemental composition of deposited lines was studied by EDX analysis. ► Electrical properties of copper were examined by impedance spectroscopy.
We have pioneered in revealing the fact that sorbitol may be used as an efficient reducing agent in the process of laser-induced copper deposition from solutions; in this case, it is possible to obtain copper lines much higher quality than by using conventional formalin.
The possibilities of laser-induced liquid phase chemical deposition (LCLD) of metal for continuous generation of nickel nanoparticles, the sizes of which allow their use as a catalyst for organic ...reactions are considered. The conditions for obtaining Ni nanoparticles by this method were optimized.
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