Work number - M 4 ALLOWED TO PARTICIPATE
Serednytski A.S., Lesyuk R.I.
Pidstryhach Institute for applied problems of mechanics and mathematics of NAS of Ukraine
The series consists of 10 papers published within 8 years.
The goal of the series is the development of laser methods for obtaining and properties modification of nanopowder metal oxide materials and structures on their basis, investigation of their physical and chemical parameters and sensor properties for development on their basis new generation gas sensors with high speed of operation, sensitivity and selectivity. In the work for the first time the ТіО2, ZnOnanopowders and structures “core-shell” on their basis have been obtained with the laser ablation method with metal target in gas chemical active ambient. Physical regularities for metal oxide nanoparticles formation processes have been established and dependences of disperse and phase composition and their structure parameters on spatial and time parameters of laser irradiation and technological parameters of chemical-active atmosphere have been obtained. Physical and chemical irregularities of adsorptive electron states on the surface of initial and doped nanopowder TiO2 andZnOand structures on their basis with “core-shell” architecture by gas adsorption have been established and a high sensitivity of luminescence bandsto the adsorbed molecules and their concentration has been revealed. For the first time a method of conductive tracks formation on the aluminum oxide substrate through silver nanoparticles sintering in the photo-induced substrate heating modus with pulsed laser irradiation was proposed and implemented. Behavior of conductive tracks resistance dependence on pulse energy, duration and frequency was established. The technology of laser annealing of silver nanoparticles layer was proposed and developed, what leads to essential sintering time reduction in comparison with known thermal methods. The practical significance is to develop a laboratory model gas sensor system with high sensitivity, speed, and selectivity.