The nature of processes controlling the kinetics of indium oxide-based thin film gas sensor response

Temperature-dependent Photoconductance and Optical Properties of In2O3 Thin Films Prepared by Autowave Oxidation

“…As a result of the additional carriers generation, given their lifetimes, these films may increase the sensitivity of sensors because gases adsorbed on the film surface will capture the generated carriers. The gas could then be identified from changes in the electrical resistance and the resistance relaxation rate [48,49].…”

In2O3-Based Thermoelectric Materials: The State of the Art and the Role of Surface State in the Improvement of the Efficiency of Thermoelectric Conversion

“…In particular, through changes in operating temperature and the surrounding atmosphere, we obtain the possibility to influence the height of the potential barrier between the crystallites and thereby achieve the maximum impact of the filtration effect on the thermoelectric conversion. For example, according to references [204,205], a maximum power factor is observed at a temperature, ~250 °C, which corresponds to the temperatures at which the desorption of water from the surface of In2O3 and a slight decrease in Ub take place. Considering the strong optimizing influence of the filtration effect on the efficiency of thermoelectric conversion (Figure 21), one can suggest that by controlling the surface state of the In2O3 crystallites, the values of PF and ZT, acceptable for practical use, may be achieved at temperatures which are significantly below 1000 °C.…”

“…As is known, the concentration of oxygen and water chemisorbed on the metal oxide surface is controlled by the surface processes and is dependent on both temperature and surrounding atmosphere, including air humidity [204,205]. As a result, the power factor of the nanoscaled materials can have fundamentally different temperature dependences compared to sintered materials, where the influence of the surface effects on the value of PF is minimized ( Figure 23).…”

Platinum Coating on an Ultrathin InN Epilayer as a Dual Gas Sensor for Selective Sensing of Ammonia and Acetone by Temperature Modulation for Liver Malfunction and Diabetes Applications

“…Therefore, the modulation of the electron accumulation at an InN epilayer is much higher because the Pt film is in direct contact with the InN film. 16,19,40,[49][50][51][52][53][54][55] The following reaction will take the place of ammonia and acetone gas adsorption on the Pt-coated InN layer in an air background. The reaction mechanism of NH 3 in an air background is given by Equation 7.…”