Chemical concentrator for rapid vapor detection

1999 ◽  
Author(s):  
Michael W. Geis ◽  
Roderick R. Kunz
Keyword(s):  
Vapor Detection

Prefer-oriented Cu2O Micro-crystals: SAM Templated Growth and DMMP-vapor Detection

2011 ◽  
Vol 26 (10) ◽  
pp. 1111-1115 ◽  
Author(s):  
Tian-Tian YANG ◽  
Peng-Cheng XU ◽  
Guo-Min ZUO ◽  
Xin-Xin LI
Keyword(s):  
Vapor Detection ◽  
Templated Growth

High-Sensitivity Micro-Gas Chromatograph–Photoionization Detector for Trace Vapor Detection

ACS Sensors ◽  
2021 ◽  
Author(s):  
Maxwell Wei-Hao Li ◽  
Abhishek Ghosh ◽  
Anandram Venkatasubramanian ◽  
Ruchi Sharma ◽  
Xiaolu Huang ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Gas Chromatograph ◽  
Vapor Detection ◽  
Photoionization Detector

scholarly journals Perylene Imide-Based Optical Chemosensors for Vapor Detection

Chemosensors ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Miao Zhang ◽  
Jiangfan Shi ◽  
Chenglong Liao ◽  
Qingyun Tian ◽  
Chuanyi Wang ◽  
...  
Keyword(s):  
Molecular Design ◽  
Phase Detection ◽  
Time Reversibility ◽  
Strong Electron ◽  
Vapor Detection ◽  
Multiple Sensors ◽  
Optical Chemosensors ◽  
Potential Applications ◽  
High Fluorescence ◽  
Organic Amines

Perylene imide (PI) molecules and materials have been extensively studied for optical chemical sensors, particularly those based on fluorescence and colorimetric mode, taking advantage of the unique features of PIs such as structure tunability, good thermal, optical and chemical stability, strong electron affinity, strong visible light absorption and high fluorescence quantum yield. PI-based optical chemosensors have now found broad applications in gas phase detection of chemicals, including explosives, biomarkers of some food and diseases (such as organic amines (alkylamines and aromatic amines)), benzene homologs, organic peroxides, phenols and nitroaromatics, etc. In this review, the recent research on PI-based fluorometric and colorimetric sensors, as well as array technology incorporating multiple sensors, is reviewed along with the discussion of potential applications in environment, health and public safety areas. Specifically, we discuss the molecular design and aggregate architecture of PIs in correlation with the corresponding sensor performances (including sensitivity, selectivity, response time, recovery time, reversibility, etc.). We also provide a perspective summary highlighting the great potential for future development of PIs optical chemosensors, especially in the sensor array format that will largely enhance the detection specificity in complexed environments.

Conjugated Porous Polymers For TNT Vapor Detection

2013 ◽  
Vol 2 (5) ◽  
pp. 423-426 ◽  
Author(s):  
Jennifer L. Novotney ◽  
William R. Dichtel
Keyword(s):  
Porous Polymers ◽  
Vapor Detection

scholarly journals A colorimetric receptor combined with a microcantilever sensor for explosive vapor detection

2011 ◽  
Vol 98 (12) ◽  
pp. 123501 ◽  
Author(s):  
Weibin Zhu ◽  
Jung Su Park ◽  
Jonathan L. Sessler ◽  
Angelo Gaitas
Keyword(s):  
Vapor Detection ◽  
Colorimetric Receptor

scholarly journals Evaluation of direct reading photoionization detector performance under various operational parameters

2021 ◽  
Vol 8 (2) ◽  
pp. 123-128
Author(s):  
Amir Hossein Khoshakhlagh ◽  
Farideh Golbabaei ◽  
Mojtaba Beygzadeh ◽  
Francisco Carrasco-Marín ◽  
Seyed Jamaleddin Shahtaheri
Keyword(s):  
Relative Humidity ◽  
Dynamic Range ◽  
Reference Method ◽  
Operational Parameters ◽  
Direct Reading ◽  
Detector Performance ◽  
Vapor Detection ◽  
Sample Concentration ◽  
Photoionization Detector ◽  
Before And After

Background: A hand-held portable direct-reading monitor, including photoionization detector (PID) is renowned for its good sensitivity, considerable dynamic range, and nondestructive vapor detection ability in comparison to the tardy response of the PID in gas chromatography (GC), which its application has been restricted. In this study, the performance of a PID system (MultiRAE Lite) was evaluated as a replacement of GC in the measurement of toluene in a dynamic adsorption system. Methods: The test was done at different relative humidity levels (30%, 50%, and 80%), temperatures (21, 30, 40° C), and toluene concentrations (20, 100, 200, and 400 ppm). Results: The PID achieved 48% of all measurements meeting the comparison criterion. The results showed that the performance of the PID could be altered by the variables. The best performance of the PID was at temperature of 21° C, the relative humidity of 50%, and concentration of 200 ppm with the percentage of readings achieving the criterion of comparison to 58%, 54%, and 52%, respectively. The averages of the PID readings (mean ± SD at 200 ppm= 207.9 ± 8.7) were higher than the reference method measurements averages (mean ± SD at 200 ppm= 203.5 ± 5.8). The regression analysis of the toluene results from the PID and the reference method results indicated that the measurements were significantly correlated (r2 = 0.93). Conclusion: According to the results, the device response is linear. Therefore, the findings are acceptable in adsorption studies. In this way, the measurement of the sample concentration should be performed using the same instrument before and after the reactor in order to calculate the adsorption efficiency.

scholarly journals 6.4.1 Trace Explosive Vapor Detection Using Silicon Nanowires in a Vertical Array with a Porous Electrode

2012 ◽  
Author(s):  
Christopher R. Field ◽  
Cy Tamanaha ◽  
Susan L. Rose-Pehrsson ◽  
Pehr E. Pehrsson ◽  
Hyun Jin In
Keyword(s):  
Silicon Nanowires ◽  
Porous Electrode ◽  
Vertical Array ◽  
Vapor Detection
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