Reduction of the Measurement Time by the Prediction of the Steady-State Response for Quartz Crystal Microbalance Gas Sensors

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 mathem...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2018-07, Vol.18 (8), p.2475
Main Authors: Osorio-Arrieta, Diana L, Muñoz-Mata, José L, Beltrán-Pérez, Georgina, Castillo-Mixcóatl, Juan, Mendoza-Barrera, Claudia O, Altuzar-Aguilar, Víctor, Muñoz-Aguirre, Severino
Format: Article
Language:English
Subjects:
Correlation analysis
Ethyl cellulose
Gas sensors
measurement time reduction
Oscillators
QCM gas sensor
Quartz
Quartz crystals
steady-state response prediction
Time constant
Time measurement
transient response
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s18082475