vapor sensor
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2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Justin M. Curtiss ◽  
Darren K. Emge

AbstractGeneration and control of humidity in a testing environment is crucial when evaluating a chemical vapor sensor as water vapor in the air can not only interfere with the sensor itself, but also react with a chemical analyte changing its composition. Upon constructing a split-flow humidity generator for chemical vapor sensor development, numerous issues were observed due to instability of the generated relative humidity level and drift of the humidity over time. By first fixing the initial relative humidity output of the system at 50%, we studied the effects of flowrate on stabilization time along with long term stability for extended testing events. It was found that the stabilization time can be upwards of 7 h, but can be maintained for greater than 90 h allowing for extended experiments. Once the stabilization time was known for 50% relative humidity output, additional studies at differing humidity levels and flowrates were performed to better characterize the system. At a relative humidity of 20% there was no time required to stabilize, but when increased to 80% this time increased to over 4 h. With this information we were better able to understand the generation process and characterize the humidity generation system, output stabilization and possible modifications to limit future testing issues.


2022 ◽  
Vol 7 (1) ◽  
Author(s):  
Melany Febrina ◽  
Aditya Rianjanu ◽  
Abdul Rajak ◽  
Rino R. Mukti ◽  
Mitra Djamal

ACS Nano ◽  
2021 ◽  
Author(s):  
Evgeniya Kovalska ◽  
Nikolas Antonatos ◽  
Jan Luxa ◽  
Zdenek Sofer
Keyword(s):  

2021 ◽  
Author(s):  
Evgeniya Kovalska ◽  
Nikolas Antonatos ◽  
Jan Luxa ◽  
Zdenek Sofer

<p><a>Two-dimensional germanene has been recently explored for applications in sensing, catalysis, and energy storage. The potential of this material lies on its graphene-like optoelectronic and chemical properties. However, pure free-standing germanene cannot be found in nature and the synthetic methods are hindering the potentially fascinating properties of germanene. </a>Herein, <a>we report for the first time a single-step synthesis of few-layer germanene by electrochemical exfoliation in non-aqueous environment. As a result of simultaneous decalcification and intercalation of the electrolyte’s active ions, we achieved a low-level hydrogenation of germanene that occurs at the edges of the material. The obtained edge-hydrogenated germanene flakes have a lateral size of several micrometers which possess a cubic structure. We have pioneered the potential application of edge-hydrogenated germanene for vapor sensing and demonstrated its specific sensitivity to methanol and ethanol. We have shown a selective behavior of the germanene-based sensor that appears to increase the electrical resistance in the vapors where methanol prevails. We anticipate that these results can provide a new approach for emerging layered materials with the potential utility in advanced gas sensing.</a></p>


2021 ◽  
Author(s):  
Evgeniya Kovalska ◽  
Nikolas Antonatos ◽  
Jan Luxa ◽  
Zdenek Sofer

<p><a>Two-dimensional germanene has been recently explored for applications in sensing, catalysis, and energy storage. The potential of this material lies on its graphene-like optoelectronic and chemical properties. However, pure free-standing germanene cannot be found in nature and the synthetic methods are hindering the potentially fascinating properties of germanene. </a>Herein, <a>we report for the first time a single-step synthesis of few-layer germanene by electrochemical exfoliation in non-aqueous environment. As a result of simultaneous decalcification and intercalation of the electrolyte’s active ions, we achieved a low-level hydrogenation of germanene that occurs at the edges of the material. The obtained edge-hydrogenated germanene flakes have a lateral size of several micrometers which possess a cubic structure. We have pioneered the potential application of edge-hydrogenated germanene for vapor sensing and demonstrated its specific sensitivity to methanol and ethanol. We have shown a selective behavior of the germanene-based sensor that appears to increase the electrical resistance in the vapors where methanol prevails. We anticipate that these results can provide a new approach for emerging layered materials with the potential utility in advanced gas sensing.</a></p>


Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 298
Author(s):  
Petr Slobodian ◽  
Pavel Riha ◽  
Robert Olejnik ◽  
Jiri Matyas ◽  
Rostislav Slobodian

A novel microstrip resonant vapor sensor made from a conductive multiwalled carbon nanotubes/ethylene-octene copolymer composite, of which its sensing properties were distinctively altered by vapor polarity, was developed for the detection of organic vapors. The alteration resulted from the modified composite electronic impedance due to the penetration of the vapors into the copolymer matrix, which subsequently swelled, increased the distances between the carbon nanotubes, and disrupted the conducting paths. This in turn modified the reflection coefficient frequency spectra. Since both the spectra and magnitudes of the reflection coefficients at the resonant frequencies of tested vapors were distinct, a combination of these parameters was used to identify the occurrence of a particular vapor or to differentiate components of vapor mixtures. Thus, one multivariate MWCNT/copolymer microstrip resonant sensor superseded an array of selective sensors.


The Analyst ◽  
2021 ◽  
Author(s):  
Zhaolong Wang ◽  
Kuo Zhan ◽  
Yabin Zhu ◽  
Jun Yan ◽  
Bin Liu ◽  
...  

Superiorly sensitive, selective, and repetitive real-time detecting the low concentration benzene vapor is vitally important in environmental protection and human health. The zeolitic imidazolate framework-8@graphene quantum dots (ZIF-8@GQDs) based three-dimensional...


Author(s):  
Ylias Mohammad Sabri ◽  
Ahmad Kandjani ◽  
Christopher J Harrison ◽  
Satya Ranjan Sarker ◽  
anastasio chalkidis ◽  
...  

A close-packed gold nanorods (Au-NR) monolayer was deposited on titanium-based quartz crystal microbalance (QCM) and its performance for elemental mercury (Hg0) vapor sorption and detection was compared with that of...


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