Integrated pre-concentrator gas sensor microsystem for ppb level benzene detection

Leidinger, M.; Rieger, Max; Sauerwald, Tilman; Alépée, Christine; Schütze, Andreas

doi:10.1016/j.snb.2016.04.064

Cited by 72 publications

(53 citation statements)

References 23 publications

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“…For the environmental monitoring, especially in rural areas, even lower detection limits are needed to monitor the benzene concentration (Schneidemesser et al, 2010). A possible strategy for the further reduction of the detection limit are sensor/preconcentrator micro systems (Leidinger et al, 2016a) and a further optimization of the sensor system electronics to reduce the noise of the signal . For the quantification of benzene, a combination of the DSR model for feature extraction and a multilinear regression for the compensation of interferents has been tested successfully.…”

Section: Resultsmentioning

confidence: 99%

Highly sensitive benzene detection with metal oxide semiconductor gas sensors – an inter-laboratory comparison

Sauerwald

Baur

Leidinger

et al. 2018

J. Sens. Sens. Syst.

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Abstract. For detection of benzene, a gas sensor system with metal oxide semiconductor (MOS) gas sensors using temperature-cycled operation (TCO) is presented. The system has been tested in two different laboratories at the concentration range from 0.5 up to 10 ppb. The system is equipped with three gas sensors and advanced temperature control and read-out electronics for the extraction of features from the TCO signals. A sensor model is used to describe the sensor response in dependence on the gas concentration. It is based on a linear differential surface reduction (DSR) at a low temperature phase, which is linked to an exponential growth of the sensor conductance. To compensate for cross interference to other gases, the DSR is measured at three different temperatures (200, 250, 300 • C) and the calculated features are put into a multilinear regression (partial least square regression -PLSR) for the quantification of benzene at both laboratories. In the tests with the first set-up, benzene was supplied in defined gas profiles in a continuous gas flow with variation of humidity and various interferents, e.g. toluene and carbon monoxide (CO). Depending on the gas background and interferents, the quantification accuracy is between ±0.2 and ±2 ppb. The second gas mixing system is based on a circulation of the carrier gas stream in a closed-loop control for the benzene concentration and other test gases based on continuously available reference measurements for benzene and other organic and inorganic compounds. In this system, a similar accuracy was achieved for low background contaminations and constant humidity; the benzene level could be quantified with an error of less than 0.5 ppb. The transfer of regression models for one laboratory to the other has been tested successfully.

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Section: Resultsmentioning

confidence: 99%

Highly sensitive benzene detection with metal oxide semiconductor gas sensors – an inter-laboratory comparison

Sauerwald

Baur

Leidinger

et al. 2018

J. Sens. Sens. Syst.

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“…The function principle is also illustrated in a video to allow better understanding of the complex interaction within the microsystem [55]. Note that after release of the target gases from the pre-concentrator and subsequent cool-down, the pre-concentrator actually achieves a zero-air atmosphere within the package, at least for all gases adsorbing on the pre-concentrator [54]. This will actually allow an internal reference, as the sensors are briefly exposed only to permanent gases such as CO and H 2 , thus improving the performance for target VOC detection and quantification by taking this into account in the signal evaluation.…”

Section: Novel Integrated Pre-concentrator Gas Sensor Microsystemmentioning

confidence: 99%

“…VOCs present in the ambient enter the package through the gas access and accumulate in the MOF material which has a large inner surface reaching partition coefficients orders of magnitude better than standard Tenax ® [53]. Heating the µ-pre-concentrator will release the adsorbed gas molecules resulting in a considerably increased gas concentration within the sensor package, which is detected by the sensors [54]. Figure 4 illustrates the function principle of this novel approach which is based on gas transport by diffusion only thus requiring a miniaturized packaging solution.…”

Section: Novel Integrated Pre-concentrator Gas Sensor Microsystemmentioning

confidence: 99%

“…(b) Simulated gas concentrations inside the pre-concentrator material (left scale) and in the air (right scale), simulated for benzene and HKUST-1 as pre-concentrator material 1.5 s after start of desorption at 200 • C. The highest gas concentration is obtained inside the microsystem, i.e., at the locations of the two gas sensor chips S1 and S2. Adapted from [54]. …”

Section: Novel Integrated Pre-concentrator Gas Sensor Microsystemmentioning

confidence: 99%

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Highly Sensitive and Selective VOC Sensor Systems Based on Semiconductor Gas Sensors: How to?

et al. 2017

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Abstract:Monitoring of volatile organic compounds (VOCs) is of increasing importance in many application fields such as environmental monitoring, indoor air quality, industrial safety, fire detection, and health applications. The challenges in all of these applications are the wide variety and low concentrations of target molecules combined with the complex matrix containing many inorganic and organic interferents. This paper will give an overview over the application fields and address the requirements, pitfalls, and possible solutions for using low-cost sensor systems for VOC monitoring. The focus lies on highly sensitive metal oxide semiconductor gas sensors, which show very high sensitivity, but normally lack selectivity required for targeting relevant VOC monitoring applications. In addition to providing an overview of methods to increase the selectivity, especially virtual multisensors achieved with dynamic operation, and boost the sensitivity further via novel pro-concentrator concepts, we will also address the requirement for high-performance gas test systems, advanced solutions for operating and read-out electronic, and, finally, a cost-efficient factory and on-site calibration. The various methods will be primarily discussed in the context of requirements for monitoring of indoor air quality, but can equally be applied for environmental monitoring and other fields.

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“…The need for indoor and outdoor gas monitoring has proliferated in recent years, especially in robotics, gas production factories, air quality monitoring, and environmental protection . Gas sensors can be classified into numerous types depending on their method of detection such as electrical, acoustic, optic, calorimetric, and chromatographic response .…”

Section: Introductionmentioning

confidence: 99%

Surface functionalized nanocellulose as a veritable inclusionary material in contemporary bioinspired applications: A review

Chin

Ting

Ong

et al. 2017

J of Applied Polymer Sci

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The past few decades have seen extraordinary gain in interest for bio-based products, driven by the intensifying call of the society for petrochemical material replacement and developing materials with next-to-no environmental impact. Cellulose, which is an abundantly available "green" material, can be derived from plant fibers and tailored for a plethora of possible uses where it can be used as a substrate or as a filler material. However, emerging technologies and product advancements necessitate the search for materials that are small, biodegradable, lightweight, and strong. Nanocellulose, which can be obtained through as mechanical and chemical production methods with tensile strength and Young's modulus of up to 0.5 and 130 GPa, respectively, proves to be the answer that they were looking for. However, the inherent hydrophilic nature of nanocellulose limited its potential widespread application. Surface modifications of nanocellulose to alter and diminish its hydrophilicity were done to address the aforementioned issues. In this article, we had reviewed on different types of surface modifications and their resulting impact on the properties of nanocellulose and their effect on polymer composites. The importance of nanocellulose in emerging applications such as biosensor, nanoremediation, papermaking, and automotive as well as the current state of the industry and the commercialization progress of nanocellulose were also discussed.

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Integrated pre-concentrator gas sensor microsystem for ppb level benzene detection

Cited by 72 publications

References 23 publications

Highly sensitive benzene detection with metal oxide semiconductor gas sensors – an inter-laboratory comparison

Highly sensitive benzene detection with metal oxide semiconductor gas sensors – an inter-laboratory comparison

Highly Sensitive and Selective VOC Sensor Systems Based on Semiconductor Gas Sensors: How to?

Surface functionalized nanocellulose as a veritable inclusionary material in contemporary bioinspired applications: A review

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