Selectivity Modification of SnO₂‐Based Materials for Gas Sensor Arrays

Abstract

An enhancement of selectivity of sensor materials, based on nanocrystalline SnO2 is reported. Selectivity toward target gases such as CO, NO2, NH3, H2S and acetone vapor, could be achieved by selection of catalytic cluster distributed over the surface of thick film material. Presented results allow us to propose application of obtained materials in "electronic nose" sensor systems

The influence of gold nanoparticles on the conductivity response of SnO2-based thin film gas sensors

“…These results along with data given by Krivetskiy et al [15] indicate that modification by gold can also be effective in the development of SnO 2 -based sensors of ozone, acetone vapors, hydrogen, and so forth. Regarding NO 2 sensors, more research is needed because studies presented in [15,53,54] gave inconsistent results.…”

“…The sensitization to ozone leads to the conclusion that the field of using surface modifications by gold should not be limited to optimization of CO sensor parameters [14]. These results along with data given by Krivetskiy et al [15] indicate that modification by gold can also be effective in the development of SnO 2 -based sensors of ozone, acetone vapors, hydrogen, and so forth. Regarding NO 2 sensors, more research is needed because studies presented in [15,53,54] gave inconsistent results.…”

“…It is observed that the maximum response to reducing gases takes place at T oper of ~450°C, whereas the maximum response to ozone is observed at T oper of ~280°C. Such a major difference in the behavior of the sensor responses to reducing and oxidizing gases is typical for metal oxide sensors and can be explained by a difference in the reactivity of the tested gases [10,15,36,46]. To eliminate the side effects of treatments used during SILD of AuNPs on the sensor parameters, we performed additional experiments with the studied samples; tested sensors were subjected to the same treatments as they were during gold deposition, except that the treatment in an aqueous solution of HAuCl 4 was replaced by washing with water.…”

“…For example, it was found that a reaction of CO oxidation, with the participation of an Aubased catalyst, could proceed at an increased rate at significantly lower temperatures than when using conventional catalysts [8]. Therefore, during the last decade among the research aimed at using gold nanoparticles (AuNPs) in heterogeneous catalysis [9], there have been reports related to using AuNPs for surface functionalization of metal oxides in solid state sensors, including in conductometric gas sensors [10][11][12][13][14][15]. It was assumed that surface modification with gold nanoparticles would allow for the design of selective CO gas sensors that could be operated at low temperature.…”

Palladium (II) Oxide Nanostructures as Promising Materials for Gas Sensors

“…In most cases, for this purpose, the n-type semiconductors such as SnO 2 [14][15][16][17][18][19][20], ZnO [21][22][23][24][25][26], WO 3 [27][28][29][30][31][32], In 2 O 3 [33,34], and TiO 2 [35] are used traditionally. In recent years, the search of the materials, which would be capable to lower the detection limit of oxidizing gases, became more active.…”