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Martin Vrňata

Czech Republic

Assoc. Prof. Martin Vrňata Dipl. Eng.


Future Forces Forum Future Forces Exhibition 2016 World CBRN & Medical Congress (CEBIRAM) 2016

Faculty of Chemical Engineering, Department of Physics and Measurement
University of Chemical Technology Prague


Presentation

Indirect Detection of 2-nitrotoluene Explosives Taggant on Chemiresistors

The contribution deals with indirect detection of 2-nitrotoluene (2-NT), which is the most widely used taggant in explosives, on chemiresistors, whose sensitive layer consists of palladium nanoparticles and silver phthalocyanine – Pd (1 nm)/AgPc (250 nm). The taggant vapors were detected chemiresistor in two modes: without- or with- photoactivation by ultraviolet radiation (λ = 266 nm). While the dc-response (Sdc) to 190 ppm of non-activated 2-NT was negligible, on photoactivation we reached the value of Sdc = 5.8. This significant improvement, which is attributed to the formation of nitrogen dioxide during photoactivation of 2-NT, and also negligible interaction of sensor with water vapor as the most common interferent, make our method applicable for early detection of tagged explosives in real "field" conditions. The detection limit was estimated to be 10 ppm of 2-NT. Moreover, the Pd/AgPc chemiresitors exhibited excellent recovery after detection of photoactivated 2-NT.


Curriculum Vitae

Education:

 

2006

Associated Professor (doc.) - Czech Technical University in Prague, Faculty of Electrical Engineering - branch: Measurement Engineering

1996

Dr. - University of Chemical Technology in Prague, Faculty of Chemical Technology - branch: Materials for Electronics

1993

MSc. (Ing.) - University of Chemical Technology in Prague, Faculty of Chemical Technology - branch: Materials for Electronics

Professional Experience:

2014 –

present

Czech Committee of IMEKO (International Measurement Konfederation) – member

 

2009 –

present

Academic Council at the Faculty of Chemical Engineering, UCT Prague - member

2006 –

2010

Czech Office for Standards, Metrology and Testing - member of  Technical Committee (TNK) No.56

1998 –

present

University of Chemical Technology (UCT) Prague, Faculty of Chemical Engineering, Department of Physics and Measurement

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