Acetone is a toxic air pollutant and key breath marker for non-invasively monitoring fat metabolism. Its routine detection in realistic gas mixtures (i.e., human indoor air), however, challenging, as low-cost acetone sensors suffer from insufficient selectivity. Here, compact detector sensing introduced, having unprecedented selectivity (>250) over the most challenging interferants (e.g., alcohols, aldehydes, aromatics, isoprene, ammonia, H2, CO). That way, quantified with fast response (<1...

Routine detection of health parameters is desirable to recognize the early onset metabolic diseases (e.g., diabetes mellitus) and personalize their treatment. Promising are non-invasive, affordable portable technologies, such as breath sensors. Yet, selective monitoring markers acetone for lipolysis) with sensors track changes that can reveal disease-related abnormalities remains challenging. Here, subtle during fasting, exercise glucose ingestion tracked in two model situations: Patients...

Ethanol is a major confounder in gas sensing because of its omnipresence indoor air and breath from disinfectants or alcoholic beverages. In fact, most modern sensors (e.g., graphene, carbon nanotubes, metal oxides) are sensitive to ethanol. This challenging ethanol often present at higher concentrations than target analytes. Here, simple modular packed bed filter presented that selectively continuously removes (and other alcohols like 1-butanol, isopropanol, methanol) over critical acetone,...

Abstract More than 1 million workers are exposed routinely to carcinogenic benzene, contained in various consumer products (e.g., gasoline, rubbers, and dyes) released from combustion of organics tobacco). Despite strict limits 50 parts per billion (ppb) the European Union), routine monitoring benzene is rarely done since low‐cost sensors lack accuracy. This work presents a compact, battery‐driven device that detects gas mixtures with unprecedented selectivity (&gt;200) over inorganics,...

Chemical sensors based on metal oxides (MOx) are most promising for emerging applications including medical breath analysis, distributed environmental monitoring and rapid food quality assessment. Yet, such not established in daily practice, mainly due to their limited selectivity, sensitivity stability. Catalytic filters offer an effective solution improve these by converting interferants inactive species and/or target analytes more responsive ones. This has been exploited successfully...

Mobile health technologies can provide information routinely and on demand to manage metabolic diseases (e.g., diabetes obesity) optimize their treatment exercise or dieting). Most promising is breath acetone monitoring track lipolysis complement standard glucose monitoring. Yet, accurate quantification of down parts‐per‐billion (ppb) difficult with compact mobile devices in the presence interferants at comparable higher concentrations. Herein, a low‐cost detector that quantifies end‐tidal...

Low‐cost metal oxide sensors are highly attractive for emerging applications such as breath analysis. Particularly promising p‐type that can operate at low temperatures, a key requirement compact and low‐power devices. To date, however, these lack sufficient sensitivity, selectivity, humidity robustness to fulfil stringent requirements faced in real applications. Herein, flame‐made sensor (operated 150 °C) consists of CeO 2 ‐decorated CuO nanoparticles is introduced, determined by X‐ray...

Abstract Exhaled breath acetone (BrAce) was investigated during and after submaximal aerobic exercise as a volatile biomarker for metabolic responsiveness in high lower-fit individuals prospective cohort pilot-study. Twenty healthy adults (19–39 years) with different levels of cardiorespiratory fitness (VO 2peak ), determined by spiroergometry, were recruited. BrAce repeatedly measured proton-transfer-reaction time-of-flight mass spectrometry (PTR-TOF-MS) 40–55 min cycling post-exercise...

Non-invasive breath analysis with mobile health devices bears tremendous potential to guide therapeutic treatment and personalize lifestyle changes. Of particular interest is the volatile acetone, a biomarker for fat burning, that could help in understanding treating metabolic diseases. Here, we report hand-held (6 × 10 19.5 cm3), light-weight (490 g), simple device rapid acetone detection breath. It comprises tailor-made end-tidal sampling unit, connected sensor pump on-demand sampling, all...

Liver diseases (e.g., cirrhosis, cancer) cause more than two million deaths per year worldwide. This is partly attributed to late diagnosis and insufficient screening techniques. A promising biomarker for noninvasive inexpensive liver disease breath limonene that can indicate a deficiency of the cytochrome P450 enzymes. Here, we introduce compact low-cost detector dynamic selective sensing. It comprises chemoresistive sensor based on Si/WO3 nanoparticles pre-screened by packed bed Tenax...

Abstract The influence of the interface in ZnO−ZrO 2 catalysts for selective hydrogenation CO to CH 3 OH is investigated. Specifically, we perturbed its structure using two different synthetic methods: surface organometallic chemistry (SOMC) and flame‐spray pyrolysis (FSP) investigated speciation resulting materials by spectroscopic techniques, such as XAS, NMR, IR, UV‐Vis, EPR. results indicate that oxidic Zn particles co‐exist with ZrO , synthesized FSP, show a superior selectivity...

Catalytic packed bed filters ahead of gas sensors can drastically improve their selectivity, a key challenge in medical, food and environmental applications. Yet, such require high operation temperatures (usually some hundreds °C) impeding integration into low-power (e.g., battery-driven) devices. Here, we reveal room-temperature catalytic that facilitate highly selective acetone sensing, breath marker for body fat burn monitoring. Varying the Pt content between 0–10 mol% during flame spray...

Introduction Ammonia (NH 3 ) is an important marker for food spoilage[1] as well a toxic environmental pollutant emitted from concrete walls, fertilizers or refrigeration systems[2]. Therefore, low-cost compact sensors the detection of hazardous NH are urgently needed. Metal-oxide (chemo-resistive) gas attractive they offer simple operation, low power consumption and can be integrated into portable devices.[3] In specific, α-phase MoO promising down to 50 parts per billion (ppb) at dry...

Introduction Chemo-resistive sensors are highly promising for the detection of trace-level compounds in medical diagnostics[1] or indoor air monitoring[2]. In particular, gas made by direct flame-aerosol synthesis attractive due to their porous and crack-free sensing films[3]. They composed high-surface area nanoparticles with diverse composition tuned ppb-level sensitivity high selectivity towards key analytes such as Si-doped WO 3 acetone[1] Ti-doped ZnO isoprene[4]. Fabrication...

Introduction Compact and low-cost gas sensors are urgently sought in emerging applications including indoor air monitoring[1], search rescue[2], medical diagnostics[3]. While chemo-resistive feature remarkable sensitivities to detect even parts-per-billion (ppb) concentrations, a key limitation is selectivity, impeding commercial use[4]. An important interfering molecule ethanol due its omnipresence the environment at high concentrations. In specific, concentrations may reach...