Journal
ANALYTICA CHIMICA ACTA
Volume 1013, Issue -, Pages 13-25Publisher
ELSEVIER
DOI: 10.1016/j.aca.2018.01.062
Keywords
Semiconductor gas sensors; Metal-oxide sensors; Limit of detection; Non-linear; Humidity interference; Temperature modulation
Categories
Funding
- Spanish MINECO program [TEC2014-59229-R, PCIN-2013-195, BES-2015-071698]
- Departament d'Universitats, Recerca i Societat de la Informacio de la Generalitat de Catalunya [2014-SGR-1445]
- Comissionat per a Universitats i Recerca del DIUE de la Generalitat de Catalunya
- European Social Fund
- Institut de Bioenginyeria de Catalunya (IBEC)
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The limit of detection (LOD) is a key figure of merit in chemical sensing. However, the estimation of this figure of merit is hindered by the non-linear calibration curve characteristic of semiconductor gas sensor technologies such as, metal oxide (MOX), gasFETs or thermoelectric sensors. Additionally, chemical sensors suffer from cross-sensitivities and temporal stability problems. The application of the International Union of Pure and Applied Chemistry (IUPAC) recommendations for univariate LOD estimation in non-linear semiconductor gas sensors is not straightforward due to the strong statistical requirements of the IUPAC methodology (linearity, homoscedasticity, normality). Here, we propose a methodological approach to LOD estimation through linearized calibration models. As an example, the methodology is applied to the detection of low concentrations of carbon monoxide using MOX gas sensors in a scenario where the main source of error is the presence of uncontrolled levels of humidity. (C) 2018 Elsevier B.V. All rights reserved.
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