Tuning operating temperature of BaSnO3 gas sensor for reducing and oxidizing gases

Abstract

Barium stannate (BaSnO3) was prepared by solid state ceramic route. The crystalline phase of the prepared sample was confirmed by X-Ray Diffraction (XRD) pattern. Gas sensing behaviour of barium stannate was investigated for reducing and oxidizing gases; such as butane, ethanol, CO and NO2; from 5 ppm to 50 ppm levels of concentration. Barium stannate sensors were optimized for highest responsiveness by varying operating temperature between 270 o C to 550 o C. Its highest response was observed for ethanol at 300 o C. The gas sensing response of ethanol was better than other gases at all the operating temperatures. Such studies in conjunction with gas sensing tests can be used for setting the optimum operating temperatures and can be used for low concentration ethanol sensing applications.

Preparation of double-doping LaFeO3 thin film for ethanol sensing application

“…Operating temperature is one of crucial parameter to consider for the potential practicality application of gas sensors and sensing process, such as gas adsorption and desorption phenomena on sensors surface are subject to the sensors operating In the one hand, 𝐵𝑎𝑆𝑛𝑂 3 is a perovskite sensor which presents a higher response in presence of ethanol gas. Then, response is found to be equal to 5 at the operating temperature which is equal to 300 𝑝𝑝𝑚 for a concentration equal to 50 𝑝𝑝𝑚 [25]. In the other hand, our sensor presents a response equal to 2.040 in presence of very low concentration (5 𝑝𝑝𝑚) of ethanol gas (𝐓𝐚𝐛𝐥𝐞 .…”

Wide-Bandgap CaSnO3 Perovskite As an Efficient and Selective Deep-UV Absorber for Self-Powered and High-Performance p-i-n Photodetector

“…The ambient oxygen molecules adsorbed on the CaSnO 3 and SnO 2 film in the forms of ionic oxygen (O − , O 2 − , and O 2− ) during the storage period can increase the device resistance. 41,42 Upon UV illumination, CaSnO 3 and SnO 2 generate electron−hole pairs and the ionic oxygen adsorbed on CaSnO 3 and SnO 2 combines with oppositely charged holes to form neutral O 2 gas, resulting in the free electrons. Therefore, when UV was applied, the overall resistance decreased and photocurrent gradually increased due to the desorption of ionic oxygen from CaSnO 3 and SnO 2 .…”

“…Unlike many organic perovskites that can be degraded upon air exposure, the CaSnO 3 perovskite can virtually maintain its original optoelectrical property for a long time owing to the octahedral SnO 6 sites protected by the inert Ca sites. , The gradual increase in the photocurrent after one month of storage, as seen in Figure c, is thought to be associated with oxygen adsorption/desorption on the CaSnO 3 and SnO 2 surface. The ambient oxygen molecules adsorbed on the CaSnO 3 and SnO 2 film in the forms of ionic oxygen (O – , O 2 – , and O 2– ) during the storage period can increase the device resistance. , Upon UV illumination, CaSnO 3 and SnO 2 generate electron–hole pairs and the ionic oxygen adsorbed on CaSnO 3 and SnO 2 combines with oppositely charged holes to form neutral O 2 gas, resulting in the free electrons. Therefore, when UV was applied, the overall resistance decreased and photocurrent gradually increased due to the desorption of ionic oxygen from CaSnO 3 and SnO 2 .…”

Formation of ceramic bodies using submicron msno3 (m = ba, zn, ca) particles and evaluation of their electric behaviour in different atmospheres

“…Perovskites MSnO 3 (M = Ba, Zn, Ca) are outstanding materials due to the great diversity of their technological applications, which include use as dielectric materials [1][2][3], gas sensors [4][5][6], solar cells [7][8][9] and anodes for lithium-ion batteries [10][11][12]. To obtain these perovskite-like structures, different synthesis methods have been used, including sol-gel [10,13,14], hydrothermal [4,15,16], co-precipitation [3,6] and solid-state reaction [2,17] processes.…”