Abstract
This paper presents a new approach to reduce the measurement time by the prediction of the steady-state using the transient response to ethanol for quartz crystal microbalance gas sensors coated with ethyl cellulose. The experimentally measured response curves were successively fitted using a mathematical model based on the sum of two exponentials with different time constants. The parameters of the model were determined, and the time constants and the magnitude of the steady-state response were analyzed. Even though the time constants did not stabilize well, the parameter corresponding to the magnitude of the steady-state response quickly converged and stabilized after 37 s. Moreover, this calculated parameter was highly correlated with the measured values of the steady-state response, which was measured at five times the longest time constant (83 s) of the model. Therefore, the steady-state response could be predicted with a 55% reduction in the measurement (detection) time.
Highlights
The reduction of the measurement time of gas sensors is essential for the detection of gases that can be very dangerous for the human health, such as the inhalation of inert gases or any other poisonous gas which can provoke asphyxia and death
The study was performed for ethyl-cellulose coated quartz crystal microbalance (QCM) gas/odour sensors and the response to ethanol samples
The parameters of the mathematical model were calculated, in particular, the time constants (τ 1, τ 2 ) and the c parameter, which corresponds to the steady-state response
Summary
The reduction of the measurement time of gas sensors is essential for the detection of gases that can be very dangerous for the human health, such as the inhalation of inert gases or any other poisonous gas which can provoke asphyxia and death. Association (EIGA) [1] and DiMaio et al [2], at low levels of oxygen, fainting can occur in 40 s and death within a few minutes. Some gases such as arsine and ammonia, among others, with a determined concentration can be lethal in less than 60 s, and many sensors perform the detection in 80 or 100 s [3,4,5], such that to decrease the detection time from 80 s to 40 s can be crucial to save lives. For gas sensors based on quartz crystal microbalance (QCM) the response can be obtained in tens of seconds or even in minutes [10,11]
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