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Sensors 2014, 14(7), 11467-11491; doi:10.3390/s140711467
Article

Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection

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Received: 31 March 2014; in revised form: 19 May 2014 / Accepted: 11 June 2014 / Published: 27 June 2014
(This article belongs to the Special Issue Chemo- and Biosensors for Security and Defense)
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Abstract: The article offers a comparison of the sensitivities for vapour trace detection of Trinitrotoluene (TNT) explosives of two different sensor systems: a chemo-mechanical sensor based on chemically modified Atomic Force Microscope (AFM) cantilevers based on Micro Electro Mechanical System (MEMS) technology with optical detection (CMO), and a miniature system based on capacitive detection of chemically functionalized planar capacitors with interdigitated electrodes with a comb-like structure with electronic detection (CE). In both cases (either CMO or CE), the sensor surfaces are chemically functionalized with a layer of APhS (trimethoxyphenylsilane) molecules, which give the strongest sensor response for TNT. The construction and calibration of a vapour generator is also presented. The measurements of the sensor response to TNT are performed under equal conditions for both systems, and the results show that CE system with ultrasensitive electronics is far superior to optical detection using MEMS. Using CMO system, we can detect 300 molecules of TNT in 10+12 molecules of N2 carrier gas, whereas the CE system can detect three molecules of TNT in 10+12 molecules of carrier N2.
Keywords: small capacitance measurements; Trinitrotoluene (TNT) vapour trace detection; chemical modification; gas sensor; Micro Electro Mechanical System (MEMS) sensors; vapour trace detection small capacitance measurements; Trinitrotoluene (TNT) vapour trace detection; chemical modification; gas sensor; Micro Electro Mechanical System (MEMS) sensors; vapour trace detection
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Strle, D.; Štefane, B.; Zupanič, E.; Trifkovič, M.; Maček, M.; Jakša, G.; Kvasič, I.; Muševič, I. Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection. Sensors 2014, 14, 11467-11491.

AMA Style

Strle D, Štefane B, Zupanič E, Trifkovič M, Maček M, Jakša G, Kvasič I, Muševič I. Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection. Sensors. 2014; 14(7):11467-11491.

Chicago/Turabian Style

Strle, Drago; Štefane, Bogdan; Zupanič, Erik; Trifkovič, Mario; Maček, Marijan; Jakša, Gregor; Kvasič, Ivan; Muševič, Igor. 2014. "Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection." Sensors 14, no. 7: 11467-11491.


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