Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection
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) techno...
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| Format: | Article |
| Language: | English |
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MDPI AG
2014-06-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/14/7/11467 |
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| author | Drago Strle Bogdan Štefane Erik Zupanič Mario Trifkovič Marijan Maček Gregor Jakša Ivan Kvasič Igor Muševič |
| author_facet | Drago Strle Bogdan Štefane Erik Zupanič Mario Trifkovič Marijan Maček Gregor Jakša Ivan Kvasič Igor Muševič |
| author_sort | Drago Strle |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-14T03:34:04Z |
| format | Article |
| id | doaj.art-b0cab3a4968e498fa927d7bff3e41ced |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-14T03:34:04Z |
| publishDate | 2014-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-b0cab3a4968e498fa927d7bff3e41ced2022-12-22T02:14:51ZengMDPI AGSensors1424-82202014-06-01147114671149110.3390/s140711467s140711467Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic DetectionDrago Strle0Bogdan Štefane1Erik Zupanič2Mario Trifkovič3Marijan Maček4Gregor Jakša5Ivan Kvasič6Igor Muševič7Faculty for Electrical Engineering, University of Ljubljana, Tržaška 25, Ljubljana 1000, SloveniaFaculty for Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, Ljubljana 1000, SloveniaInstitute Jozef Stefan, Jamova 39, Ljubljana 1000, SloveniaFaculty for Electrical Engineering, University of Ljubljana, Tržaška 25, Ljubljana 1000, SloveniaFaculty for Electrical Engineering, University of Ljubljana, Tržaška 25, Ljubljana 1000, SloveniaFaculty for Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, Ljubljana 1000, SloveniaInstitute Jozef Stefan, Jamova 39, Ljubljana 1000, SloveniaInstitute Jozef Stefan, Jamova 39, Ljubljana 1000, SloveniaThe 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.http://www.mdpi.com/1424-8220/14/7/11467small capacitance measurementsTrinitrotoluene (TNT) vapour trace detectionchemical modificationgas sensorMicro Electro Mechanical System (MEMS) sensorsvapour trace detection |
| spellingShingle | Drago Strle Bogdan Štefane Erik Zupanič Mario Trifkovič Marijan Maček Gregor Jakša Ivan Kvasič Igor Muševič Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection Sensors small capacitance measurements Trinitrotoluene (TNT) vapour trace detection chemical modification gas sensor Micro Electro Mechanical System (MEMS) sensors vapour trace detection |
| title | Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection |
| title_full | Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection |
| title_fullStr | Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection |
| title_full_unstemmed | Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection |
| title_short | Sensitivity Comparison of Vapor Trace Detection of Explosives Based on Chemo-Mechanical Sensing with Optical Detection and Capacitive Sensing with Electronic Detection |
| title_sort | sensitivity comparison of vapor trace detection of explosives based on chemo mechanical sensing with optical detection and capacitive sensing with electronic detection |
| topic | small capacitance measurements Trinitrotoluene (TNT) vapour trace detection chemical modification gas sensor Micro Electro Mechanical System (MEMS) sensors vapour trace detection |
| url | http://www.mdpi.com/1424-8220/14/7/11467 |
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