Detection of taggants in explosives on nanostructured metal/silver phthalocyanine chemiresistors: Influence of analyte photoactivation

Our work deals with detection of the two most widely used taggants in explosives (2-nitrotoluene and 2,3-dimethyl-2,3-dinitrobutane) on metal/silver phthalocyanine chemiresistors, when the analyte vapors are activated by ultraviolet radiation (λ=266nm). As the first step, morphological and electrica...

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Published inSensors and actuators. B, Chemical Vol. 239; pp. 147 - 156
Main Authors Tomeček, David, Fitl, Přemysl, Vlček, Jan, Marešová, Eva, Vrňata, Martin
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.02.2017
Elsevier Science Ltd
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Abstract Our work deals with detection of the two most widely used taggants in explosives (2-nitrotoluene and 2,3-dimethyl-2,3-dinitrobutane) on metal/silver phthalocyanine chemiresistors, when the analyte vapors are activated by ultraviolet radiation (λ=266nm). As the first step, morphological and electrical properties of gold, palladium and silver non-continuous layers deposited on silver phthalocyanine (AgPc) have been studied. Experiments monitored by SEM confirmed formation of metal clusters on organic surface if subthreshold amount of metal is deposited onto the AgPc layer (i.e. layer of equivalent thickness of 4nm for Pd, 5nm for Au and 8nm for Ag) and thermal stabilization follows. We demonstrated that metallic non-continuous layers on AgPc can be used for effective adjustment of chemiresistor's electrical resistance. Resistance of all modified sensors in reference atmosphere (synthetic air) − R0 − was effectively shifted by one to four orders of magnitude to lower values, so that cheaper devices and set-ups can be used for resistance measurements. Moreover, measurements of responses of Me/AgPc chemiresistors to 1ppm of NO2 revealed that the presence of metal reduces the sensor response time (τ90). On basis of optimal R0 and τ90 values, Pd(1nm)/AgPc chemiresistor was selected to be the most prospective for detection of taggants. Finally, the taggants were detected on Pd (1nm)/AgPc chemiresistor in two modes: without- or with- photoactivation. While the dc-response (Sdc) to 190ppm of non-activated 2-nitrotoluene vapors 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-nitrotoluene, 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 Pd(1nm)/AgPc sensors exhibited excellent recovery after detection of photoactivated 2-NT. The recovery was achieved by thermal regeneration steps (sensor temperature switches from 40 °C to 120°C and vice-versa)
AbstractList Our work deals with detection of the two most widely used taggants in explosives (2-nitrotoluene and 2,3-dimethyl-2,3-dinitrobutane) on metal/silver phthalocyanine chemiresistors, when the analyte vapors are activated by ultraviolet radiation (λ=266nm). As the first step, morphological and electrical properties of gold, palladium and silver non-continuous layers deposited on silver phthalocyanine (AgPc) have been studied. Experiments monitored by SEM confirmed formation of metal clusters on organic surface if subthreshold amount of metal is deposited onto the AgPc layer (i.e. layer of equivalent thickness of 4nm for Pd, 5nm for Au and 8nm for Ag) and thermal stabilization follows. We demonstrated that metallic non-continuous layers on AgPc can be used for effective adjustment of chemiresistor's electrical resistance. Resistance of all modified sensors in reference atmosphere (synthetic air) − R0 − was effectively shifted by one to four orders of magnitude to lower values, so that cheaper devices and set-ups can be used for resistance measurements. Moreover, measurements of responses of Me/AgPc chemiresistors to 1ppm of NO2 revealed that the presence of metal reduces the sensor response time (τ90). On basis of optimal R0 and τ90 values, Pd(1nm)/AgPc chemiresistor was selected to be the most prospective for detection of taggants. Finally, the taggants were detected on Pd (1nm)/AgPc chemiresistor in two modes: without- or with- photoactivation. While the dc-response (Sdc) to 190ppm of non-activated 2-nitrotoluene vapors 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-nitrotoluene, 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 Pd(1nm)/AgPc sensors exhibited excellent recovery after detection of photoactivated 2-NT. The recovery was achieved by thermal regeneration steps (sensor temperature switches from 40 °C to 120°C and vice-versa)
Our work deals with detection of the two most widely used taggants in explosives (2-nitrotoluene and 2,3-dimethyl-2,3-dinitrobutane) on metal/silver phthalocyanine chemiresistors, when the analyte vapors are activated by ultraviolet radiation ( lambda =266nm). As the first step, morphological and electrical properties of gold, palladium and silver non-continuous layers deposited on silver phthalocyanine (AgPc) have been studied. Experiments monitored by SEM confirmed formation of metal clusters on organic surface if subthreshold amount of metal is deposited onto the AgPc layer (i.e. layer of equivalent thickness of 4nm for Pd, 5nm for Au and 8nm for Ag) and thermal stabilization follows. We demonstrated that metallic non-continuous layers on AgPc can be used for effective adjustment of chemiresistor's electrical resistance. Resistance of all modified sensors in reference atmosphere (synthetic air) - R 0 - was effectively shifted by one to four orders of magnitude to lower values, so that cheaper devices and set-ups can be used for resistance measurements. Moreover, measurements of responses of Me/AgPc chemiresistors to 1ppm of NO2 revealed that the presence of metal reduces the sensor response time ( tau 90). On basis of optimal R 0 and tau 90 values, Pd(1nm)/AgPc chemiresistor was selected to be the most prospective for detection of taggants. Finally, the taggants were detected on Pd (1nm)/AgPc chemiresistor in two modes: without- or with- photoactivation. While the dc-response (S dc) to 190ppm of non-activated 2-nitrotoluene vapors was negligible, on photoactivation we reached the value of S dc =5.8. This significant improvement, which is attributed to the formation of nitrogen dioxide during photoactivation of 2-nitrotoluene, 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 Pd(1nm)/AgPc sensors exhibited excellent recovery after detection of photoactivated 2-NT. The recovery was achieved by thermal regeneration steps (sensor temperature switches from 40 degree C to 120 degree C and vice-versa)
Our work deals with detection of the two most widely used taggants in explosives (2-nitrotoluene and 2,3-dimethyl-2,3-dinitrobutane) on metal/silver phthalocyanine chemiresistors, when the analyte vapors are activated by ultraviolet radiation (λ = 266 nm). As the first step, morphological and electrical properties of gold, palladium and silver non-continuous layers deposited on silver phthalocyanine (AgPc) have been studied. Experiments monitored by SEM confirmed formation of metal clusters on organic surface if subthreshold amount of metal is deposited onto the AgPc layer (i.e. layer of equivalent thickness of 4 nm for Pd, 5 nm for Au and 8 nm for Ag) and thermal stabilization follows. We demonstrated that metallic non-continuous layers on AgPc can be used for effective adjustment of chemiresistor's electrical resistance. Resistance of all modified sensors in reference atmosphere (synthetic air) − R0 − was effectively shifted by one to four orders of magnitude to lower values, so that cheaper devices and set-ups can be used for resistance measurements. Moreover, measurements of responses of Me/AgPc chemiresistors to 1 ppm of NO2 revealed that the presence of metal reduces the sensor response time (τ90). On basis of optimal R0 and τ90 values, Pd(1 nm)/AgPc chemiresistor was selected to be the most prospective for detection of taggants. Finally, the taggants were detected on Pd (1 nm)/AgPc chemiresistor in two modes: without- or with- photoactivation. While the dc-response (Sdc) to 190 ppm of non-activated 2-nitrotoluene vapors 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-nitrotoluene, 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 Pd(1 nm)/AgPc sensors exhibited excellent recovery after detection of photoactivated 2-NT. The recovery was achieved by thermal regeneration steps (sensor temperature switches from 40 °C to 120 °C and vice-versa)
Author Vlček, Jan
Fitl, Přemysl
Vrňata, Martin
Marešová, Eva
Tomeček, David
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Keywords Metal nanoparticles
Chemiresistors
Detection of taggants in explosives
Phthalocyanine thin films
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Snippet Our work deals with detection of the two most widely used taggants in explosives (2-nitrotoluene and 2,3-dimethyl-2,3-dinitrobutane) on metal/silver...
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elsevier
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StartPage 147
SubjectTerms Chemiresistors
Detection of taggants in explosives
Electrical properties
Explosives
Explosives detection
Formations
Gold
Metal clusters
Metal nanoparticles
Nanoparticles
Nanostructured materials
Nitrogen dioxide
Nitrotoluene
Organic chemistry
Palladium
Phthalocyanine thin films
Recovery
Regeneration
Response time
Sensors
Silver
Switches
Thermal regeneration
Thickness
Ultraviolet radiation
Water vapor
Title Detection of taggants in explosives on nanostructured metal/silver phthalocyanine chemiresistors: Influence of analyte photoactivation
URI https://dx.doi.org/10.1016/j.snb.2016.07.033
https://www.proquest.com/docview/2090591164
https://search.proquest.com/docview/1864550433
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