Richtwerte für zyklische Dimethylsiloxane in der Innenraumluft. Mitteilung der Ad-hoc-Arbeitsgruppe Innenraumrichtwerte der Innenraumlufthygiene-Kommission des Umweltbundesamtes und der Obersten Landesgesundheitsbehörden

doi:10.1007/s00103-010-1218-5

Cited by 4 publications

(3 citation statements)

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“…Exposure to siloxane is known to change the properties of metal oxide semiconductor (MOS) gas sensors in terms of response time, sensitivity and selectivity (Williams and Pratt, 1998;Schüler et al, 2015). These changes are caused by the decomposition of the siloxanes on the hot sensor surface leading to the formation of non-volatile reaction products like polymers or silica (Rücker and Kümmerer, 2015) and hence to a decrease in reactivity, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In catalysis this deactivation is called poisoning (Elsayed et al, 2017), a term that is also widely used in the MOS gas sensor community (Korotcenkov and Cho, 2011) even though the effect does not always lead to sensor deterioration. Extensive siloxane exposure decreases the sensitivity of a MOS gas sensor to a wide range of gases except for hydrogen H 2 (Williams and Pratt, 1998). MOS gas sensors for volatile organic compounds (VOCs), e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the enormous importance, the process of surface deactivation on sensors is poorly understood. Several authors have reported that during a siloxane treatment process a rise in sensitivity is observed at first followed by decreasing sensitivity (Williams and Pratt, 1998;Meng et al, 2019). In this work, we want to improve the understanding of siloxane treatment effects on the sensing layer using a special temperature variation technique called differential surface reduction (DSR), which allows the determination of rate constants for gas reactions on the sensor surface.…”

Section: Introductionmentioning

confidence: 99%

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Siloxane treatment of metal oxide semiconductor gas sensors in temperature-cycled operation – sensitivity and selectivity

Schultealbert

Uzun

Baur

et al. 2020

J. Sens. Sens. Syst.

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Abstract. The impact of a hexamethyldisiloxane (HMDSO) treatment on the response of doped SnO2 sensors is investigated for acetone, carbon monoxide and hydrogen. The sensor was operated in temperature cycles based on the DSR concept (differential surface reduction). According to this concept, the rate constants for the reduction and oxidation of the surface after fast temperature changes can be evaluated and used for quantification of reducing gases as well as quantification and compensation of sensor poisoning by siloxanes, which is shown in this work. Increasing HMDSO exposure reduces the rate constants and therefore the sensitivity of the sensor more and more for all processes. On the other hand, while the rate constants for acetone and carbon monoxide are reduced nearly to zero already for short treatments, the hydrogen sensitivity remains fairly stable, which greatly increases the selectivity. During repeated HMDSO treatment the quasistatic sensitivity, i.e. equilibrium sensitivity at one point during the temperature cycle, rises at first for all gases but then drops rapidly for acetone and carbon monoxide, which can also be explained by reduced rate constants for oxygen chemisorption on the sensor surface when considering the generation of surface charge.

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Section: Introductionmentioning

confidence: 99%