Sensitive detection of plastic explosives with self-assembled monolayer-coated microcantilevers

Pinnaduwage, Lal A.; Boiadjiev, V.; Hawk, J. E.; Thundat, Thomas

doi:10.1063/1.1602156

Cited by 190 publications

(108 citation statements)

References 12 publications

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“…Upon binding of the molecules, the cantilever bends and the bending is detected electrically as a change in the resistance of the integrated piezoresistor or optically as a deflection of a laser light hitting the apex of the cantilever. Sensitive and selective sensors can detect trace amounts of explosives in real-time, as demonstrated for example with PETN, RDX [4] and TNT [5]. Recently, polymer cantilevers fabricated at DTU Nanotech were used for the detection of the nerve gas model DMMP [6].…”

Section: B Cantilever Based Sensingmentioning

confidence: 99%

The Xsense project: The application of an intelligent sensor array for high sensitivity handheld explosives detectors

Kostesha

Schmidt

Bosco

et al. 2011

2011 IEEE Sensors Applications Symposium

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Abstract-Multiple independent sensors are used in security and military applications in order to increase sensitivity, selectivity and data reliability. The Xsense project has been initiated at the Technical University of Denmark in collaboration with a number of partners in an effort to produce a handheld sensor for trace detection of explosives. We are using micro-and nano technological approaches for integrating four sensing principles into a single device. At the end of the project, the consortium aims at having delivered a sensor platform consisting of four independent detector principles capable of identifying concentrations of TNT, DNT, HMX and RDX at sub parts-per-billion (ppb) levels and with a false positive rate less than 1 parts-perthousand. The specificity, sensitivity, reliability and the speed of responses are ensured by the use of advanced data processing, surface functionalization and nanostructured sensors and sensor design.

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Section: B Cantilever Based Sensingmentioning

confidence: 99%

The Xsense project: The application of an intelligent sensor array for high sensitivity handheld explosives detectors

Kostesha

Schmidt

Bosco

et al. 2011

2011 IEEE Sensors Applications Symposium

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show abstract

“…This is partly due to the projected high sensitivity resulting from the large surface area to volume ratio, which greatly amplifies surface effects. Microcantilevers have been shown to detect certain chemical gases in the low ppt level [4][5][6] and recently detect the presence of a few molecules. 7 Furthermore, microcantilevers can inexpensively be manufactured into small arrays containing a very large number of sensors.…”

Section: Introductionmentioning

confidence: 99%

Sorption-induced static bending of microcantilevers coated with viscoelastic material

Wenzel

Josse

Heinrich

et al. 2008

Journal of Applied Physics

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Absorption of a chemical analyte into a polymer coating results in an expansion governed by the concentration and type of analyte that has diffused into the bulk of the coating. When the coating is attached to a microcantilever, this expansion results in bending of the device. Assuming that absorption ͑i.e., diffusion across the surface barrier into the bulk of the coating͒ is Fickian, with a rate of absorption that is proportional to the difference between the absorbed concentration and the equilibrium concentration, and the coating is elastic, the bending response of the coated device should exhibit a first-order behavior. However, for polymer coatings, complex behaviors exhibiting an overshoot that slowly decays to the steady-state value have been observed. A theoretical model of absorption-induced static bending of a microcantilever coated with a viscoelastic material is presented, starting from the general stress/strain relationship for a viscoelastic material. The model accounts for viscoelastic stress relaxation and possible coating plasticization. Calculated responses show that the model is capable of reproducing the same transient behavior exhibited in the experimental data. The theory presented can also be used for extracting viscoelastic properties of the coating from the measured bending data.

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“…In low viscosity media, this quasi-static bending measurement is carried out together with the resonance frequency shift to provide a more robust detection procedure [7]. On the one hand, the detection specificity may be improved by tailoring the used coatings.…”

mentioning

confidence: 99%

Charge redistribution in electrochemically actuated mechanical sensors

Amiot

Kanoufi

Hild

et al. 2009

Sensors and Actuators A: Physical

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to real-life applications also requires the monitored mechanical effect to be highly specific. Moving towards more specificity in cantilever-based sensing, monitoring the mechanical response of electrochemically actuated microcantilevers is then thought to provide a fast, reliable and complementary experimental information to the longtime cantilever bending measurement for the detection of target molecules. Full-field measurements are therefore used to investigate the way the electro-elastic coupling is altered when a microcantilever undergoes decane-thiol adsorption. The proposed technique reveals that the latter results in a charge density redistribution along the cantilever in addition to the local surface passivation. Focusing on the cantilever tip displacement under electrochemical actuation, this redistribution partially compensates the electro-elastic coupling alteration due to the surface passivation, therefore possibly yielding an ambiguous detection result. This effect should be taken into account for the optimal design of specific electrochemically actuated mechanical sensors.

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Sensitive detection of plastic explosives with self-assembled monolayer-coated microcantilevers

Cited by 190 publications

References 12 publications

The Xsense project: The application of an intelligent sensor array for high sensitivity handheld explosives detectors

The Xsense project: The application of an intelligent sensor array for high sensitivity handheld explosives detectors

Sorption-induced static bending of microcantilevers coated with viscoelastic material

Charge redistribution in electrochemically actuated mechanical sensors

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