Next Article in Journal
An Analysis of Electrical Impedance Measurements Applied for Plant N Status Estimation in Lettuce (Lactuca sativa)
Next Article in Special Issue
Love-Wave Sensors Combined with Microfluidics for Fast Detection of Biological Warfare Agents
Previous Article in Journal
Distributed Least-Squares Estimation of a Remote Chemical Source via Convex Combination in Wireless Sensor Networks
Previous Article in Special Issue
Isolation and Epitope Mapping of Staphylococcal Enterotoxin B Single-Domain Antibodies
Article Menu

Export Article

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

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

1
Faculty for Electrical Engineering, University of Ljubljana, Tržaška 25, Ljubljana 1000, Slovenia
2
Faculty for Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, Ljubljana 1000, Slovenia
3
Institute Jozef Stefan, Jamova 39, Ljubljana 1000, Slovenia
*
Author to whom correspondence should be addressed.
Received: 31 March 2014 / Revised: 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)

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
Figures

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Supplementary material

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

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.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top