Miniature sensor suitable for electronic nose applications

Pinnaduwage, Lal A.; Gehl, Anthony C.; Allman, S. L.; Johansson, Alicia; Boisen, Anja

doi:10.1063/1.2735841

Cited by 36 publications

(20 citation statements)

References 14 publications

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“…41,42 The main advantage of this method is that external alignment is unnecessary. The principal drawbacks are the electrical noise, Joule heating, and the need for the isolation of the electrical contacts in liquids.…”

Section: Introductionmentioning

confidence: 99%

High throughput optical readout of dense arrays of nanomechanical systems for sensing applications

Martínez¹,

Kosaka²,

Tamayo³

et al. 2010

Review of Scientific Instruments

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A nano-cheese-cutter to directly measure interfacial adhesion of freestanding nano-fibers J. Appl. Phys. 111, 024315 (2012) Stabilization and growth of non-native nanocrystals at low and atmospheric pressures J. Chem. Phys. 136, 044703 (2012) Nanoparticle production in arc generated fireballs of granular silicon powder AIP Advances 2, 012126 (2012) Stability and topological transformations of liquid droplets on vapor-liquid-solid nanowires J. Appl. Phys. 111, 024302 (2012) Role of RuO3 for the formation of RuO2 nanorods Appl. Phys. Lett. 100, 033108 (2012) Additional information on Rev. Sci. Instrum. We present an instrument based on the scanning of a laser beam and the measurement of the reflected beam deflection that enables the readout of arrays of nanomechanical systems without limitation in the geometry of the sample, with high sensitivity and a spatial resolution of few micrometers. The measurement of nanoscale deformations on surfaces of cm 2 is performed automatically, with minimal need of user intervention for optical alignment. To exploit the capability of the instrument for high throughput biological and chemical sensing, we have designed and fabricated a two-dimensional array of 128 cantilevers. As a proof of concept, we measure the nanometer-scale bending of the 128 cantilevers, previously coated with a thin gold layer, induced by the adsorption and self-assembly on the gold surface of several self-assembled monolayers. The instrument is able to provide the static and dynamic responses of cantilevers with subnanometer resolution and at a rate of up to ten cantilevers per second. The instrumentation and the fabricated chip enable applications for the analysis of complex biological systems and for artificial olfaction.

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Section: Introductionmentioning

confidence: 99%

High throughput optical readout of dense arrays of nanomechanical systems for sensing applications

Martínez¹,

Kosaka²,

Tamayo³

et al. 2010

Review of Scientific Instruments

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“…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]. Our challenge is to find selective coating materials in order to bind the explosives and to minimize unspecific binding.…”

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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“…Sensitive and selective detection of DMMP has important significance because of its relevance in the detection of chemical threats. 26 Furthermore, chemical sensors are notorious for their inability to deal with humidity, and this study shows that it is possible to selectively identify DMMP vapor from water vapor.…”

Section: Introductionmentioning

confidence: 99%

Identification and quantification of components in ternary vapor mixtures using a microelectromechanical-system-based electronic nose

Zhao

Pinnaduwage

Leis

et al. 2008

Journal of Applied Physics

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We report the experimental details on the successful application of the electronic nose approach to identify and quantify components in ternary vapor mixtures. Preliminary results have recently been presented [L. A. Pinnaduwage et al., Appl. Phys. Lett. 91, 044105 (2007)]. Our microelectromechanical-system-based electronic nose is composed of a microcantilever sensor array with seven individual sensors used for vapor detection and an artificial neural network for pattern recognition. A set of custom vapor generators generated reproducible vapor mixtures in different compositions for training and testing of the neural network. The sensor array was selected to be capable of generating different response patterns to mixtures with different component proportions. Therefore, once the electronic nose was trained by using the response patterns to various compositions of the mixture, it was able to predict the composition of "unknown" mixtures. We have studied two vapor systems: one included the nerve gas simulant dimethylmethyl phosphonate at ppb concentrations and water and ethanol at ppm concentrations; the other system included acetone, water, and ethanol all of which were at ppm concentrations. In both systems, individual, binary, and ternary mixtures were analyzed with good reproducibility. Author post-print ofZhao, W., Pinnaduwagel, L., Leis, J.W., Gehl, A.C., Allman, S.L., Shepp,A. and Mahmud, K.K. (2007) Quantitative analysis of ternary vapor mixtures using a microcantilever-based electronic nose. Applied Physics Letters, 91 (4).

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Miniature sensor suitable for electronic nose applications

Cited by 36 publications

References 14 publications

High throughput optical readout of dense arrays of nanomechanical systems for sensing applications

High throughput optical readout of dense arrays of nanomechanical systems for sensing applications

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

Identification and quantification of components in ternary vapor mixtures using a microelectromechanical-system-based electronic nose

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