scholarly journals Auxiliary Electrodes for Chromium Vapor Sensors

2018 ◽  
Vol 85 (2) ◽  
pp. 49-56
Author(s):  
Jeffrey Fergus ◽  
Moaiz Shahzad ◽  
Tommy Britt
Keyword(s):  
Chromium Vapor ◽  
Vapor Sensors

An ultra-highly sensitive and selective self-enhanced AIECL sensor for public security early warning in a nuclear emergency via a co-reactive group poisoning mechanism

2021 ◽  
Author(s):  
Ziyu Wang ◽  
Meiyun Xu ◽  
Nan Zhang ◽  
Jian-Bin Pan ◽  
Xinqi Wu ◽  
...  
Keyword(s):  
Detection Limit ◽  
Early Warning ◽  
High Selectivity ◽  
Public Security ◽  
Reactive Group ◽  
Low Detection Limit ◽  
Highly Sensitive ◽  
Vapor Sensors ◽  
Nuclear Emergency

A mechanism of co-reactive group poisoning (CGP) was discovered for designing efficient I2 vapor sensors for early warning of a nuclear emergency, which give an ultra-low detection limit of 0.13 ppt as well as high selectivity.

scholarly journals Influence of Water Molecules on the Detection of Volatile Organic Compounds (VOC) Cancer Biomarkers by Nanocomposite Quantum Resistive Vapor Sensors vQRS

Chemosensors ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 64
Author(s):  
Abhishek Sachan ◽  
Mickaël Castro ◽  
Veena Choudhary ◽  
Jean-Francois Feller
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Water Molecules ◽  
Huge Amount ◽  
Detection Mechanism ◽  
Volatile Organic ◽  
Influence Of Water ◽  
Vapor Sensors ◽  
Detection Of Biomarkers ◽  
The Right

The anticipated diagnosis of various fatal diseases from the analysis of volatile organic compounds (VOC) biomarkers of the volatolome is the object of very dynamic research. Nanocomposite-based quantum resistive vapor sensors (vQRS) exhibit strong advantages in the detection of biomarkers, as they can operate at room temperature with low consumption and sub ppm (part per million) sensitivity. However, to meet this application they need to detect some ppm or less amounts of biomarkers in patients' breath, skin, or urine in complex blends of numerous VOC, most of the time hindered by a huge amount of water molecules. Therefore, it is crucial to analyze the effects of moisture on the chemo-resistive sensing behavior of carbon nanotubes based vQRS. We show that in the presence of water molecules, the sensors cannot detect the right amount of VOC molecules present in their environment. These perturbations of the detection mechanism are found to depend on the chemical interactions between water and other VOC molecules, but also on their competitive absorption on sensors receptive sites, located at the nanojunctions of the conductive architecture. This complex phenomenon studied with down to 12.5 ppm of acetone, ethanol, butanone, toluene, and cyclohexane mixed with 100 ppm of water was worth to investigate in the prospect of future developments of devices analysing real breath samples in which water can reach a concentration of 6%.

scholarly journals Imaging Spectroscopy for Transient Transport of Chromium Vapor During Helium TIG Welding

2020 ◽  
Vol 38 (2) ◽  
pp. 21s-24s
Author(s):  
Keigo TANAKA ◽  
Masaya SHIGETA ◽  
Manabu TANAKA ◽  
MURPHY Anthony B.
Keyword(s):  
Imaging Spectroscopy ◽  
Tig Welding ◽  
Transient Transport ◽  
Chromium Vapor

scholarly journals Self-Assembled Fullerene Crystals as Excellent Aromatic Vapor Sensors

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 267 ◽  
Author(s):  
Natsumi Furuuchi ◽  
Rekha Shrestha ◽  
Yuji Yamashita ◽  
Tetsuji Hirao ◽  
Katsuhiko Ariga ◽  
...  
Keyword(s):  
Average Length ◽  
Fullerene C60 ◽  
Nanoporous Structure ◽  
Face Centered Cubic ◽  
Bitter Melon ◽  
Vapor Sensing ◽  
Porous Architecture ◽  
Vapor Sensors ◽  
Self Assembled ◽  
Face Centered

Here we report the aromatic vapor sensing performance of bitter melon shaped nanoporous fullerene C60 crystals that are self-assembled at a liquid-liquid interface between isopropyl alcohol and C60 solution in dodecylbenzene at 25 °C. Average length and center diameter of the crystals were ca. 10 μm and ~2 μm, respectively. Powder X-ray diffraction pattern (pXRD) confirmed a face-centered cubic (fcc) structure with cell dimension ca. a = 1.4272 nm, and V = 2.907 nm3, which is similar to that of the pristine fullerene C60. Transmission electron microscopy (TEM) confirmed the presence of a nanoporous structure. Quartz crystal microbalance (QCM) results showed that the bitter melon shaped nanoporous C60 performs as an excellent sensing system, particularly for aromatic vapors, due to their easy diffusion through the porous architecture and strong π–π interactions with the sp2-carbon.

A super-hydrophobic and electrically conductive nanofibrous membrane for a chemical vapor sensor

2018 ◽  
Vol 6 (21) ◽  
pp. 10036-10047 ◽  
Author(s):  
Jiefeng Gao ◽  
Hao Wang ◽  
Xuewu Huang ◽  
Mingjun Hu ◽  
Huaiguo Xue ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Vapor ◽  
Nanofibrous Membrane ◽  
Electrically Conductive ◽  
Vapor Sensors ◽  
Vapor Sensor ◽  
Chemical Vapor Sensor

A superhydrophobic and electrically conductive blend nanofibrous membrane was prepared for high performance chemical vapor sensors.

Dewetting Effects on Polymer-Coated Surface Acoustic Wave Vapor Sensors

1995 ◽  
Vol 67 (21) ◽  
pp. 4015-4019 ◽  
Author(s):  
Jay W. Grate ◽  
R. Andrew. McGill
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Vapor Sensors ◽  
Coated Surface
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