Application of Raman Spectroscopy to Working Gas Sensors: From in situ to operando Studies

Elger, Ann‐Kathrin; Heß, Christian

doi:10.3390/s19235075

Cited by 23 publications

(13 citation statements)

References 49 publications

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“…23 The Raman spectra of pristine ZnO and ZnO-0.425NiO composite were obtained. The peaks in Figure 5a correspond to the characteristic peaks of ZnO [58]. The Raman spectrum of ZnO-0.425NiO composite which is shown in Figure 5b is different from the spectrum of pristine ZnO, which is shown in Figure 5a; the reason for this change may be the contribution of NiO.…”

mentioning

confidence: 94%

Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

Zhou

Dastan

et al. 2020

Nanomaterials

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Metal oxide semiconductor (MOS) gas sensors have the advantages of high sensitivity, short response-recovery time and long-term stability. However, the shortcoming of poor discriminability of homogeneous gases limits their applications in gas sensors. It is well-known that the MOS materials have similar gas sensing responses to homogeneous gases such as CO and H2, so it is difficult for these gas sensors to distinguish the two gases. In this paper, simple sol–gel method was employed to obtain the ZnO–xNiO composites. Gas sensing performance results illustrated that the gas sensing properties of composites with x > 0.425 showed a p-type response to both CO and H2, while the gas sensing properties of composites with x < 0.425 showed an n-type response to both CO and H2. However, it was interesting that ZnO–0.425NiO showed a p-type response to CO but an discriminable response (n-type) to H2, which indicated that modulating the p-type or n-type semiconductor concentration in p-n composites could be an effective method with which to improve the discriminability of this type of gas sensor regarding CO and H2. The phenomenon of the special gas sensing behavior of ZnO–0.425NiO was explained based on the experimental observations and a range of characterization techniques, including XRD, HRTEM and XPS, in detail.

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mentioning

confidence: 94%

Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

Zhou

Dastan

et al. 2020

Nanomaterials

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“…Raman spectroscopy confirmed this assumption. One may observe at least two weak peaks at 612 and 747 cm −1 corresponding to TO and LO Eu modes of SnO2, respectively [32,33].…”

Section: Sensor Thin Layer Analysismentioning

confidence: 99%

High-Sensitivity Metal Oxide Sensors Duplex for On-the-Field Detection of Acetic Acid Arising from the Degradation of Cellulose Acetate-Based Cinematographic and Photographic Films

et al. 2022

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In this work, a system consisting of two resistive sensors working in tandem to detect and quantify the acetic acid released during the degradation of cellulose acetate-based ancient cinematographic and photographic films is presented. Acetic acid must be constantly monitored to prevent reaching concentrations at which autocatalytic degradation processes begin. The sensors are constituted by a thin layer of metal oxide (tungsten oxide and tin oxide) deposited over an interdigitated electrode capable of being heated, chosen to maximize the array response towards acetic acid vapors. The signals obtained from the sensor array are mathematically processed to reduce the background signal due to interferent gases produced during degradation of ancient cinematographic films. The sensor array reported a LOD of 30 ppb for acetic acid, with a linearity range up to 30 ppm. Finally, the sensor array was tested with different cinematographic and photographic film samples made of cellulose acetate, whose degradation state and acetic acid production was validated using the conventional technique (A-D strips). The presented array is suitable for remote monitoring large number of films in collections since, compared to the official technique, it has a lower detection limit (30 ppb vs. 500 ppb) and is much quicker in providing accurate acetic acid concentration in the film boxes (15 min vs. 24 h).

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“…and Hess Ch. in 2019 [ 113 ]. To summarise: In situ measurement is a characteristic of a material measured in operational conditions or conditions significant for operational conditions.…”

Section: Semiconductor Gas Sensors—electrical Resistance Measurementsmentioning

confidence: 99%

A Review of Gas Measurement Set-Ups

Fuśnik¹,

Szafraniak²,

Paleczek³

et al. 2022

Sensors

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Measurements of the properties of gas-sensitive materials are a subject of constant research, including continuous developments and improvements of measurement methods and, consequently, measurement set-ups. Preparation of the test set-up is a key aspect of research, and it has a significant impact on the tested sensor. This paper aims to review the current state of the art in the field of gas-sensing measurement and provide overall conclusions of how the different set-ups impact the obtained results.

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Application of Raman Spectroscopy to Working Gas Sensors: From in situ to operando Studies

Cited by 23 publications

References 49 publications

Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

High-Sensitivity Metal Oxide Sensors Duplex for On-the-Field Detection of Acetic Acid Arising from the Degradation of Cellulose Acetate-Based Cinematographic and Photographic Films

A Review of Gas Measurement Set-Ups

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