Applied Physics and Mathematics Annotation << Back GAS CHEMICAL NANOSENSORS WITH SENSING ELEMENTS BASED ON TITANIUM DIOXIDE: THE ANALYSIS OF DEVELOPMENT DURING LAST YEARS. PART 1 V.A. BUZANOVSKII The results of development of gas chemical nanosensors with sensing elements based on titanium dioxide received during the last few years are submitted in the review. The developed devices are systematized according to construction features of sensing elements. Thus, four nanosensor groups are defi ned. Group 1 is devices sensing elements of which have a covering of only titanium dioxide. Group 2 is nanosensors with the sensing elements containing a covering of titanium dioxide and an external layer of other material. Group 3 is devices sensing elements of which have a covering of the composite based on titanium dioxide. Group 4 is nanosensors with the sensing elements containing a covering of the composite based on titanium dioxide and an external layer of other material. Analytical abilities of the listed device groups are considered. Typical regularities are marked. In particular, ability of the nanosensors to determination of the big number of inorganic and organic chemical compounds is presented; infl uence of thickness, morphology and composition of a covering and temperature of sensing element on sensitivity and selectivity of measurements, response time and recovery time is shown. The review consists of two parts. The construction features and analytical abilities of nanosensors of group 1 and 2 are refl ected in the fi rst part of the review. The second part of the review is devoted to the construction features and analytical abilities of devices of group 3 and 4. At the end of the review, the general characteristic of the listed groups of nanosensors is given and fi elds of their potential application are specifi ed. Key words: nanotechnology, nanomaterial, gas chemical nanosensor, sensing element, covering, titanium dioxide, metrological characteristic. Contacts: E-mail: vab1960@rambler.ru Pp. 11-34.