Gas chemical nanosensors with sensing elements based on titanium dioxide

Resumo

The results of the development of gas chemical nanosensors with sensing elements based on titanium dioxide are presented in the review. The developed devices are systematized in accordance with the features of construction of their sensing elements. Four groups of nanosensors are specified: devices with sensing elements containing a coating of only titanium dioxide (Group 1), nanosensors with sensing elements containing a coating of a layer of titanium dioxide with an outer layer of another material (Group 2), devices with sensing elements containing a coating of a composite material based on titanium dioxide (Group 3), and nanosensors with sensing elements containing a coating of a layer of a composite material based on titanium dioxide with an outer layer of another material (Group 4). The analytical capabilities of the devices of these groups are assessed. Some patterns in their behavior are discussed. In particular, the potential of nanosensors in the identification of a large number of inorganic and organic chemical compounds is demonstrated. The effect of thickness, morphology, composition of the coating, and temperature of the sensing elements on the sensitivity and selectivity of measurements and the response and recovery times is shown.