A humidity-independent ammonia sensor based on a quartz microbalance: a test under agricultural conditions

Rechenbach, T.; Schramm, Ursula; Boeker, Peter; Horner, G.; Roesky, C.E.O; Trepte, J.; Winter, Sascha; Pollex, R.; Bargon, Joachim; Weber, Edwin; Lammers, Peter Schulze

doi:10.1016/s0925-4005(99)00144-6

Cited by 16 publications

(6 citation statements)

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“…For molecules with low molecular masses such as ammonia and water, both molecules had similar chemical properties, complex interaction with Cu þ ion, and a rather similar volume and shape. 15 The frequency increase signal at low humidity could be attributed to the same response mechanism as NH 3 gas. While the frequency decreased at high humidity may be because of a large amount of H 2 O molecules adsorbed on the surface of the CuBr-coated QCM sensor.…”

Section: ' Results and Discussionmentioning

confidence: 86%

“…The frequency increased at the humidity of 33% and 51%, whereas the frequency decrease was observed at the humidity of 85% and 97%. For molecules with low molecular masses such as ammonia and water, both molecules had similar chemical properties, complex interaction with Cu + ion, and a rather similar volume and shape . The frequency increase signal at low humidity could be attributed to the same response mechanism as NH 3 gas.…”

Section: Resultsmentioning

confidence: 91%

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NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

Zhang

et al. 2011

J. Phys. Chem. C

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Copper(I) bromide (CuBr) was considered to be a good gas sensing material with a high sensitivity and selectivity to ammonia (NH3) at ambient temperature. The NH3 sensing mechanism was generally considered to be a result of the strong interaction between NH3 molecules and Cu+ ions. When CuBr-coated quartz-crystal microbalance (QCM), a typical gravimetric transducer, was exposed to NH3, the device displayed a decrease rather than an increase in total mass. This was an unusual phenomenon. In situ diffuse reflectance infrared Fourier transform spectrometry (DRIFTS) was employed to examine the reasons of this total mass decrease. Probing of species formed on the CuBr surface revealed that a complex form between the Cu+ ions and the O2 molecules in air existed. Consequently, O2 gas with a higher molecular weight than NH3 was substituted by NH3 gas, inducing the decrease in mass. The band at 1123 cm−1 of the DRIFT spectrum of CuBr corresponding to the complex formed between O2 molecules and Cu+ ions was identified. The intensity of this band which decreased with the formation of NH3 complex was also observed. The observation was a result of the substitution process for O2 adsorption instead of NH3.

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Section: ' Results and Discussionmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 91%

NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

Zhang

et al. 2011

J. Phys. Chem. C

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“…There is an increasing demand for high-precision and sensitive real-time humidity detection, which is important not only for traditional industries, such as agriculture [1], grain storage [2] and industrial production, but also for high-tech industries, such as semiconductor technology, huma-health real-time detection and clean energy storage [3,4]. QCMs have the ability to monitor mass changes at the sub-nanogram level [5][6][7], as well as convert the dynamic-adsorption mass change of thin membranes deposited on electrodes into resonance-frequency-shift information [8,9].…”

Section: Introductionmentioning

confidence: 99%

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Peng

Zhao

et al. 2022

Membranes

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The application of graphene oxide (GO)-based membranes combined with a quartz crystal microbalance (QCM) as a humidity sensor has attracted great interest over the past few years. Understanding the influence of the structure of the GO membrane (GOM) on the adsorption/desorption of water molecules and the transport mechanism of water molecules in the membrane is crucial for development of applications using GOM-based humidity sensors. In this paper, by investigating the effects of oxygen-containing groups, flake size and interlayer spacing on the performance of humidity sensing, it was found that humidity-sensing performance could be improved by rational membrane-structure design and the introduction of magnesium ions, which can expand the interlayer spacing. Therefore, a novel HGO&GO&Mg2+ structure prepared by uniformly doping magnesium ions into GO&HGO thin composite membranes was designed for humidity sensing from 11.3% RH to 97.3% RH. The corresponding sensor exhibits a greatly improved humidity sensitivity (~34.3 Hz/%RH) compared with the original pure GO-based QCM sensor (~4.0 Hz/%RH). In addition, the sensor exhibits rapid response/recovery times (7 s/6 s), low hysteresis (~3.2%), excellent repeatability and good stability. This research is conducive to understanding the mechanism of GOM-based humidity sensors. Owing to its good humidity-sensing properties, the HGO&GO&Mg2+ membrane-based QCM humidity sensor is a good candidate for humidity sensing.

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“…Van Noort et al [9] improved the sensitivity of a quartz crystal microbalance for biosensing by treating the electrodes with porous gold. Rechenbach et al [10] detected ammonia by using a humidity-independent sensor that is based on a quartz crystal microbalance. They developed a robust humidity-independent ammonia sensor combined with a partial least square (PLS) analysis for agricultural applications.…”

Section: Theorymentioning

confidence: 99%

Detection of odour emissions from a composting facility using a QCM sensor array

2003

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Odour emissions from a composting facility were detected by using a quartz crystal microbalance (QCM) sensor array. The array consists of six sensor elements, which were coated with different materials. A series of tests under field conditions showed that considerable sensor frequency changes were detected during the compost-turning period. Using principal component analysis, it was found that more than 90% of the data variance could still be explained by use of two principal components.

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A humidity-independent ammonia sensor based on a quartz microbalance: a test under agricultural conditions

Cited by 16 publications

References 3 publications

NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Detection of odour emissions from a composting facility using a QCM sensor array

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A humidity-independent ammonia sensor based on a quartz microbalance: a test under agricultural conditions

Cited by 16 publications

References 3 publications

NH3 Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu+ Ion with NH3 and O2 Molecules

NH3 Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu+ Ion with NH3 and O2 Molecules

Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Detection of odour emissions from a composting facility using a QCM sensor array

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NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules

NH₃ Sensing Mechanism Investigation of CuBr: Different Complex Interactions of the Cu⁺ Ion with NH₃ and O₂ Molecules