Nanocrystalline tin dioxide: Basics in relation with gas sensing phenomena part II. Active centers and sensor behavior

• Published in: Inorganic materials Vol. 52; no. 13; pp. 1311 - 1338
• Main Authors: Marikutsa, A. V., Rumyantseva, M. N., Gaskov, A. M., Samoylov, A. M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2016; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Materials Science; Nanocrystals; Nanoparticles; Noble metals; Oxides; Redox reactions; Selectivity; Semiconductors; Sensors; Surface chemistry; Target detection; Tin dioxide; active centers; tin dioxide; noble metals; semiconductor oxides; nanocrystal materials; gas sensors
• ISSN: 0020-1685; 1608-3172
• DOI: 10.1134/S0020168516130045

The experimental data and theoretical concepts on the nature and physicochemical properties of the active centers at the surface of tin dioxide are reported, which are involved in detection of toxic and explosive ambient impurities. The active centers formed at the nanocrystal SnO 2 surface are classified on the basis of their chemical properties, and their role in the interaction of semiconductor nanocrystal oxides with the gases exhibiting the redox properties is confirmed. The chemical modification of the SnO 2 surface aimed at elaborating a controlled amount of specific active centers is shown to be the most efficient method for increasing the selectivity of sensors. Selecting the optimum catalytic modifiers (nanoparticles or clusters of noble metals and their oxides) allows the sensor sensitivity and selectivity of the target gas detection to be increased.