Hydrogen sensors on the basis of SnO2–TiO2 systems

Flexible highly sensitive hydrogen gas sensor based on a TiO2 thin film on polyimide foil

“…The high response of the presented sensor in dry conditions, which is markedly higher and acquired at lower temperatures compared to typical values obtained on similar hydrogen sensors on rigid substrates [28], [29], is a combination of all of the above mentioned factors, together with higher roughness (compared to e.g. silicon, glass or sapphire) of the polyimide foil, which enlarges the active surface of the sensing layer and thus leads to higher sensitivity…”

Semiconducting SnO2-TiO2 (S-T) composites for detection of SO2 gas

“…1 and 4) because it is well-known that TiO 2 relatively remains stable upon prolonged thermal treatment in reducing gas environment (e.g., CO, SO 2 ) compared to SnO 2 [43]. On the other hand, the conduction band edge of TiO 2 lies above that of SnO 2 , which helps to transfer the electron easily from TiO 2 [26,27]. Therefore, a typical synergistic effect is observed in the S25-T75 composite.…”

“…It has been reported that the sensor's response and selectivity can be significantly improved using composite metal oxides [20][21][22][23]. For example, SnO 2 -TiO 2 (S-T) composites showed superior synergistic effect on sensitivity than individual constituents SnO 2 and TiO 2 because the conduction band edge of TiO 2 lies above that of SnO 2 [24][25][26][27]. It has also been suggested that synthesizing a desired ratio of composite is very important to tailor gassensing properties of SMOs for environmental applications [28][29][30].…”

“…It has also been suggested that synthesizing a desired ratio of composite is very important to tailor gassensing properties of SMOs for environmental applications [28][29][30]. n-type SnO 2 and n-type TiO 2 (band gap = 3 eV) composites have been widely studied for monitoring air quality and medical applications [26,[31][32][33]. S-T composites have been prepared with various synthesis methods for detecting several gases, including H 2 [26,31,32], NO x [33][34][35][36], CO [37][38][39][40], NH 3 [27] and VOCs [41,42].…”

Synthesis, Characterization, and Gas-Sensing Properties of Mesoporous Nanocrystalline Sn<SUB><I>x</I></SUB>Ti<SUB>1-<I>x</I></SUB>O<SUB>2</SUB>

“…44 thermal stability compared to the pure SnO 2 , and higher sensitivity toward 5-2000 ppm H 2 in a wide operation temperature range was estimated. In Figure 13, the sensors based on ST10 shows a nice response (S = 19 6) in the concentration of 100 ppm H 2 at 200 C. The response of pure SnO 2 is 1.43 to 500 ppm H 2 at 300 C. 45 This was attributed to the increased amount of crystal defects from Ti-doping.…”