Nanocrystalline TiO2/SnO2 composites for gas sensors

Nanocrystalline ZnO-TiO 2 (with molar ratios 9:1, 7:3, 1:1, 3:7 and 1:9) were successfully synthesized by hydrothermal method. Synthesized materials were examined with the help of X-ray diffraction and transmission electron microscope. Liquid petroleum gas sensing characteristics of the ZnO-TiO 2 films were investigated at different operating temperatures. The ZnO-TiO 2 thick film (with 1:1 molar ratio) exhibited good response toward liquid petroleum gas as compared to other investigated compositions. Further, liquid petroleum gas sensing characteristics of CuO modified ZnO-TiO 2 thick films were investigated. 0.2 M CuO modified ZnO-TiO 2 thick film exhibited excellent liquid petroleum gas sensing characteristics such as higher response (∼1637.49 at 185°C) with quick response time (∼30 s), low recovery time (∼70 s), excellent repeatability and stability at low operating temperature.

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“…It was observed that there was no noticeable deviation in the sensor response. This was due to the presence of TiO 2 in the film [36].…”

Section: Fabrication Of Sensor Element and Gas-sensing Measurementsmentioning

confidence: 99%

Liquid petroleum gas sensing performance enhanced by CuO modification of nanocrystalline ZnO-TiO2

Pedhekar¹,

Raghuwanshi²,

Kapse

2016

Materials Science-Poland

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“…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.…”

Section: So 2 Sensing Propertiesmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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

Mulmi

Thangadurai

2016

Ionics

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SnO 2 -TiO 2 (S-T) composites with different molar ratios were prepared by mechanical mixing followed by sintering at 700°C for 4 h in air. The structural and microstructural properties of the composites were investigated using powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). S-T composites were investigated by introducing SO 2 to test their chemical stability using PXRD and SEM coupled with energy dispersive X-ray (EDX) analysis. The sensing performance was measured at different temperatures using various SO 2 concentrations (10-100 ppm). A composite comprising 25 mol% of SnO 2 and 75 mol% TiO 2 (S25-T75) exhibited the highest sensitivity comparing to other S-T composites studied under the presently investigated conditions. t 90 (90 % of response time) was found to be ∼5 min for thick pellet (~2 mm in thickness). SO 2 sensing mechanism has been explained through the band structure model.

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“…extreme temperatures [194], both high and low pH [195]. Analytical chemists have overcome such challenges by both incorporating biomolecules into sensor platforms and exploiting the desirable properties of novel materials with nanotechnology allowing the development of a variety of disposable and long-life sensors.…”

Section: Stabilitymentioning

confidence: 99%