Long term stability of metal oxide-based gas sensors for e-nose environmental applications: An overview

Romain, Anne‐Claude; Nicolas, Jacques

doi:10.1016/j.snb.2009.12.027

Cited by 270 publications

(93 citation statements)

References 24 publications

(7 reference statements)

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“…For environmental monitoring, the e-nose is able to monitor gas emissions in real time in the field and to link them to the odour concentration expressed in odour units [9].…”

Section: Measurements and Methodsmentioning

confidence: 99%

Odour Impact Assessment by Means of Dispersion Modeling, Dynamic Olfactometry and Mobile Electronic Nose around Agadir Fishing Port in Morocco

Chirmata¹,

Ichou²

2016

JEP

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Odorous emissions emitted from various sources including industrial and commercial activities have particular concerns about human health. These malodors emissions are an environmental concern that affects health status and social life of the neighbors. That requires the local authority to set up a management strategy to control this nuisance. The evaluation of odour emissions from fishing port is complex because these emissions depend on several factors such as multiple sources of odor emissions, meteorological conditions, topography and others. That imposes the use of complementary approaches to monitor odours. In this paper, the case of Agadir fishing port is studied, which is adjacent to the tourist area and residential neighborhoods and which hosts a number of points that can generate odors. To assess this odour impact, three methods are used such as dynamic olfactometry, dispersion modeling and mobile electronic nose (e-nose). The use of these three methods in a complementary manner to assess odour impacts around a fishing port allowed both the quantification of the emissions using dynamic olfactometry and the evaluation of their impact on the study area with model dispersion. The results enabled also to identify the most affected areas of the city by odor emissions and to recognize the meteorological parameters maximizing odor impact. The other goal of this work is to compare the results of the odour dispersion modeling and e-nose measurements for one year in terms of frequency of overtaking the set alert thresholds over the same period. Comparison highlights the strengths and weaknesses of both approaches. Modeling can be used predicatively but it does not take into account fugitive emissions reliably in the absence of data on these emissions, modeling based on the hourly average misjudges the odor peaks, while e-nose made it possible to obtain validated data and provides accurate, affordable and real-time odour measurement capability tacking in to account the role of human perception without being able to characterize the extent of the odor nuisance caused by each source. We conclude that these three valuation methods provide complementary information about odor nuisance and reasonable estimates of odors.

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“…For environmental monitoring, the e-nose is able to monitor gas emissions in real time in the field and to link them to the odour concentration expressed in odour units [9].…”

Section: Measurements and Methodsmentioning

confidence: 99%

Odour Impact Assessment by Means of Dispersion Modeling, Dynamic Olfactometry and Mobile Electronic Nose around Agadir Fishing Port in Morocco

Chirmata¹,

Ichou²

2016

JEP

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“…Using the feature set instead of the original signal allows for fast and compact data analysis. The obtained data is modeled using a simple physical description of the measurement system based on the following assumptions (Rodriguez et al, 2010;RagazzoSancheza et al, 2009;Brudzewski and Ulaczyk, 2009;Men et al, 2010;Romain and Nicolas, 2010;Bahraminejad et al, 2010;Flueckiger et al, 2009;Baha and Dibi, 2009):…”

Section: Discusionmentioning

confidence: 99%

A Novel Odor Key Technique for Security Applications Using Electronic Nose System

Iskandarani¹

2010

American Journal of Applied Sciences

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Problem statement:A novel approach to security applications that makes use of odors as password generators is developed and tested. The developed system detects and converts odor signals that are randomly selected to binary signals and then intelligently compares them with previously stored values. Approach: The interface device in question then either opens its interface if comparison is successful or applies security measures to extra protect resources from intrusion. The used odor keys are initially unknown to the user as it is randomly selected from a box containing many types, adding extra security to the system. This approach eliminated any possibility of hacking into the system and provides passwords which were truly secured. Results: Normal interfacing methods and algorithms were subject to hacking and infiltration. Random odor combinational keys are a novel, well secured biometric interfacing means to a wide range of systems. Design and testing of a practical electronic nose that can be used as a security interface in a wide variety of applications with a combinational odor key algorithm that ensures a hacking free environment. Conclusion/Recommendations: Successful implementation of human-machine interface through a highly secured electronic nose with very encouraging results in terms of possible odor combinations and multi-dimensional password generation.

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“…Gas sensor baseline drift consists of a random temporal variation of the sensor response when it is exposed to the same analyte under identical conditions. Romain et al 4 tested and observed two identical sensor arrays for a long term, and found that structural and phase transformations, poisoning, interference e®ects, air humidity and temperature variations, surface and bulk properties changes were the main reasons for sensor baseline drift.…”

Section: Introductionmentioning

confidence: 99%

Chemical Stability of 2D-Nanostructured WO₃ in Hydrogen Sensing Under Varied Operation Temperature

Yang

Tian

Zhang

et al. 2016

NANO

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Nanostructured metal oxide-based resistive-type gas sensors are of high research interest. Chemical stability is the most critical issue due to the surface electron species and density. In the present paper, 2D-nanostructured WO 3 was prepared and characterized, and a WO 3 -based sensor was fabricated and analyzed. The results showed that the synthesized WO 3 material exhibited nanosheet structure, and during hydrogen sensing testing, the current baseline shifted with various tendencies, even completely opposite directions under di®erent operation temperatures. The chemistry analysis results indicated that water molecule and hydroxyl group were formed under low operation temperature but further oxidation occurred at higher temperatures. The adsorption of H 2 on oxygen terminated WO 3 (0 0 1) surfaces by density functional theory (DFT) method indicated that a water molecule formed by adsorption of a hydrogen molecule at the O site with the most thermodynamically stable state, and two surface hydroxyl groups formed by dissociative adsorption with a thermodynamically less stable state. The water molecule and surface hydroxyl groups increased the conductivity of the WO 3¯l m while that was decreased as the oxidation occurred.

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Long term stability of metal oxide-based gas sensors for e-nose environmental applications: An overview

Cited by 270 publications

References 24 publications

Odour Impact Assessment by Means of Dispersion Modeling, Dynamic Olfactometry and Mobile Electronic Nose around Agadir Fishing Port in Morocco

Odour Impact Assessment by Means of Dispersion Modeling, Dynamic Olfactometry and Mobile Electronic Nose around Agadir Fishing Port in Morocco

A Novel Odor Key Technique for Security Applications Using Electronic Nose System

Chemical Stability of 2D-Nanostructured WO₃ in Hydrogen Sensing Under Varied Operation Temperature

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Long term stability of metal oxide-based gas sensors for e-nose environmental applications: An overview

Cited by 270 publications

References 24 publications

Odour Impact Assessment by Means of Dispersion Modeling, Dynamic Olfactometry and Mobile Electronic Nose around Agadir Fishing Port in Morocco

Odour Impact Assessment by Means of Dispersion Modeling, Dynamic Olfactometry and Mobile Electronic Nose around Agadir Fishing Port in Morocco

A Novel Odor Key Technique for Security Applications Using Electronic Nose System

Chemical Stability of 2D-Nanostructured WO3 in Hydrogen Sensing Under Varied Operation Temperature

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Chemical Stability of 2D-Nanostructured WO₃ in Hydrogen Sensing Under Varied Operation Temperature