Highly selective gas sensing enabled by filters

Broek, Jan van den; Weber, I.T.; Güntner, Andreas T.; Pratsinis, Sotiris E.

doi:10.1039/d0mh01453b

Cited by 62 publications

(48 citation statements)

References 306 publications

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“…Chemical gas sensors are promising for the next generation of handheld devices for air [1] or food quality monitoring [2], medical breath analysis [3] and human detection (e.g., in search and rescue [4] or translational crime control [5]). Additional filters [6] can drastically improve their performance to meet the challenging selectivity requirements of these applications, such as the quantification of single analytes among >800 [7] compounds in breath or >250 [8] in indoor air. Particularly interesting are catalytic filters that can convert interferants completely and continuously to sensor-inert species, while target analytes remain unaffected.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Catalyst Enables Selective Acetone Sensing

2021

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Catalytic packed bed filters ahead of gas sensors can drastically improve their selectivity, a key challenge in medical, food and environmental applications. Yet, such filters require high operation temperatures (usually some hundreds °C) impeding their integration into low-power (e.g., battery-driven) devices. Here, we reveal room-temperature catalytic filters that facilitate highly selective acetone sensing, a breath marker for body fat burn monitoring. Varying the Pt content between 0–10 mol% during flame spray pyrolysis resulted in Al2O3 nanoparticles decorated with Pt/PtOx clusters with predominantly 5–6 nm size, as revealed by X-ray diffraction and electron microscopy. Most importantly, Pt contents above 3 mol% removed up to 100 ppm methanol, isoprene and ethanol completely already at 40 °C and high relative humidity, while acetone was mostly preserved, as confirmed by mass spectrometry. When combined with an inexpensive, chemo-resistive sensor of flame-made Si/WO3, acetone was detected with high selectivity (≥225) over these interferants next to H2, CO, form-/acetaldehyde and 2-propanol. Such catalytic filters do not require additional heating anymore, and thus are attractive for integration into mobile health care devices to monitor, for instance, lifestyle changes in gyms, hospitals or at home.

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Section: Introductionmentioning

confidence: 99%

Room-Temperature Catalyst Enables Selective Acetone Sensing

2021

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“…This inverse design of metal–zeolite interfaces may also be extended to other types of microporous materials such as metal-organic frameworks, providing a powerful tool to tailor the confinement effects in heterogeneous catalysis. Moreover, this inverse design may find applications in zeolite-based gas sensors 41 by discriminating the access of gas molecules with different sizes.…”

Section: Discussionmentioning

confidence: 99%

Construction of Inverse Metal–Zeolite Interfaces via Area-Selective Atomic Layer Deposition

Zhai

Zhang

Cullen

et al. 2021

ACS Appl. Mater. Interfaces

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The spatial confinement at metal−zeolite interfaces offers a powerful knob to steer the selectivity of chemical reactions on metal catalysts. However, encapsulating metal catalysts into small-pore zeolites remains a challenging task. Here, we demonstrate an inverse design of metal−zeolite interfaces, "metal-on-zeolite," constructed by area-selective atomic layer deposition. This inverse design bypasses the intrinsic synthetic issues associated with metal encapsulation, offering a potential solution for the fabrication of task-specific metal−zeolite interfaces for desired catalytic applications. Infrared spectroscopy and several probe reactions confirmed the spatial confinement effects at the inverse metal−zeolite interfaces.

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“…Inert and heated Teflon tubing was used to avoid analyte adsorption and water condensation. The acetone detector comprised a compact, tubular, catalytic packed bed filter [ 76 ] at 135 °C. [ 41 ] Downstream of the filter, a chemoresistive sensor quantified the acetone concentration.…”

Section: Methodsmentioning

confidence: 99%

Monitoring Lipolysis by Sensing Breath Acetone down to Parts‐per‐Billion

et al. 2021

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Mobile health technologies can provide information routinely and on demand to manage metabolic diseases (e.g., diabetes and obesity) and optimize their treatment (e.g., exercise or dieting). Most promising is breath acetone monitoring to track lipolysis and complement standard glucose monitoring. Yet, accurate quantification of acetone down to parts‐per‐billion (ppb) is difficult with compact and mobile devices in the presence of interferants at comparable or higher concentrations. Herein, a low‐cost detector that quantifies end‐tidal acetone during exercise and rest is presented with excellent bias (25 ppb) and unprecedented precision (169 ppb) in 146 breath samples. It combines a flame‐made Pt/Al2O3 catalyst with a chemoresistive Si/WO3 sensor. The detector is robust against orders of magnitude higher ethanol concentrations from disinfection and exercise‐driven endogenous breath isoprene ones, as validated by mass spectrometry. This detector accurately tracks the individual lipolysis dynamics in all volunteers, as confirmed by blood ketone measurements. It can be integrated readily into handheld devices for personalized metabolic assessment at home, in gyms, and clinics.

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Highly selective gas sensing enabled by filters

Abstract: Sorption, size-selective & catalytic film or particle-bed filters dramatically enhance gas sensor selectivity. We critically review 300+ articles and tutorially give guidelines for systematic filter design in air quality, health & food applications.

Cited by 62 publications

References 306 publications

Room-Temperature Catalyst Enables Selective Acetone Sensing

Room-Temperature Catalyst Enables Selective Acetone Sensing

Construction of Inverse Metal–Zeolite Interfaces via Area-Selective Atomic Layer Deposition

Monitoring Lipolysis by Sensing Breath Acetone down to Parts‐per‐Billion

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