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Нанотехнологии, наноструктуры, квантовые явления. Наноэлектроника. Приборы на квантовых эффектах Nano-composite layers of SnO2-Ag are produced after deposition of Sn1-xAgx alloy on a fused silica (FS) followed by thermal oxidation. Silver nano-particles are formed inside the SnO2 layer during segregation into Kirkendall voids. A plasmonic-based optical sensing effect is demonstrated for acetone and alcohol in the temperature range of 200–400 °C. Red- and blue-shifts in the position of the plasmon-resonance peak are monitored for different conditions of SnO2+Ag layer formation and gas exposure. A dynamical response of the SnO2 /Ag sensor to methane/air cycles is measured, and the sensitivity of the sensor as a function of the operation temperature and illumination is investigated. The concept of plasmonic-based SnO2 sensors is discussed having in mind two main phenomena: First, the ability of metallic nanoparticles to hold plasmonic resonances which depends on the dielectric properties of surrounding SnO2 layer and second, the possibility of space-limited heating of nanoparticles and the neighbouring region with light, and in this way to control the chemisorption of oxygen on the sensor’s surface. Thanks due to A.Nylandsted Larsen for discussions and J.Chevalier for his assistance in magnetron sputtering. This research was supported by a Marie Curie Foundation (FP7-PEOPLE-2011-IIF) and by a grant T18P-190 of BRFFI (SR number 20181511). |
