Visual-Empirical Region-of-Influence Pattern Recognition Applied to Chemical Microsensor Array Selection and Chemical Analysis

Osbourn, G. C.; Bartholomew, J.W.; Ricco, Antonio J.; Frye, G.C.

doi:10.1021/ar970070j

Cited by 46 publications

(43 citation statements)

References 5 publications

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“…Pattern recognition algorithms in conjunction with a multiple-sensor array have been shown to mitigate crosssensitivities. 11,12,13 Polymers are selected 14,15,16,17 based on their ability to form stronger reversible chemical bonds (hydrogen bonds, π-stacking, van der Waals interactions, and dipole-dipole interactions) with the analyte than with interferents. The amount of VOC that absorbs into the polymer depends on chemical and physical properties of the polymer.…”

Section: Imentioning

confidence: 99%

Chemicapacitive microsensors for detection of explosives and TICs

et al. 2005

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Seacoast Science develops chemical sensors that use polymer-coated micromachined capacitors to measure the dielectric permittivity of an array of selectively absorbing materials. We present recent results demonstrating the sensor technology's capability to detect components in explosives and toxic industrial chemicals.These target chemicals are detected with functionalized polymers or network materials, chosen for their ability to adsorb chemicals. When exposed to vapors or gases, the permittivity of these sorbent materials changes depending on the strength of the vapor-sorbent interaction. Sensor arrays made of ten microcapacitors on a single chip have been previously shown to detect vapors of organic compounds (chemical warfare agents, industrial solvents, fuels) and inorganic gases (SO 2 , , CO 2 , NO 2 ).Two silicon microcapacitor structures were used, one with parallel electrode plates and the other with interdigitated "finger-like" electrodes. The parallel-plates were approximately 300 µm wide and separated by 750 nm. The interdigitated electrodes were approximately 400 µm long and were elevated above the substrate to provide faster vapor access. Eight to sixteen of these capacitors are fabricated on chips that are 5 x 2 mm and are packaged in less than 50 cm 3 with supporting electronics and batteries, all weighing less than 500 grams. The capacitors can be individually coated with different materials creating a small electronic nose that produces different selectivity patterns in response to different chemicals. The resulting system's compact size, low-power consumption and low manufacturing costs make the technology ideal for integration into various systems for numerous applications.

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Section: Imentioning

confidence: 99%

Chemicapacitive microsensors for detection of explosives and TICs

et al. 2005

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“…First, the architecture of the microsensor integrates an array of chemiresistors with a temperature sensor and heating elements (Figure 2) [6]. The array of differing sensors can be used to identify different VOCs by comparing the resulting chemical signatures with calibration (or training) sets and pattern-recognition methods [7][8][9][10][11][12]. The chemiresistor array has been shown to detect a variety of VOCs including aromatic hydrocarbons (e.g., benzene), chlorinated solvents (e.g., trichloroethylene (TCE), carbon tetrachloride), aliphatic hydrocarbons (e.g., hexane, iso-octane), alcohols, and ketones (e.g., acetone) [12][13].…”

Section: Chemiresistor Sensor and Packagementioning

confidence: 99%

In-Situ Chemiresistor Sensor Package for Real-Time Detection of Volatile Organic Compounds in Soil and Groundwater

Hughes

2002

Sensors

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This paper presents the development of a real-time microsensor-based monitoring system that can be used to detect and characterize volatile organic compounds in soil and groundwater. The system employs an array of polymer-based microsensors (chemiresistors) packaged in a waterproof housing that is designed to protect the sensor from harsh subsurface environments, including completely water-saturated conditions. The sensors and packaging have been tested in field and laboratory environments, and characterization methods are being developed that utilize contaminant-transport models and time-dependent, in-situ sensor data to identify the location of the contaminant source.

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“…[27][28][29] In addition to carrying the desired hydrogen-bond acidic sensor groups and having good initial sensitivity to species such as DMMP and nitroaromatics, hydrogen-bond acidic SAW sensor polymers must be robust enough to withstand multiple vapor challenges and maintain their sensitivity over time. [29][30][31] Since the linear and hyperbranched hydrogen-bond acidic polymers discussed earlier have low T g s and tend to be fluids at room temperature, it is difficult to attain a combination of good sensor properties and robust coating properties in a single polymeric material, although some attempt has been made to address this issue by crosslinking polysiloxane SAW coatings. 31 In this study, robust nanocomposite SAW coatings that maintain a good response over time 32 when airbrushed onto 500 MHz SAW platforms were prepared by dispersing polyhedral oligosilsesquioxanes (POSS) carrying hydrogen-bond acidic sensor groups within a nonsensing polycarbosilane carrier, and also within linear hydrogen-bond acidic polymer carriers (Fig.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen‐bond acidic polyhedral oligosilsesquioxane filled polymer coatings for surface acoustic wave sensors

Hartmann-Thompson

Keeley

Dvornić

et al. 2007

J of Applied Polymer Sci

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A series of novel polyhedral oligosilsesquioxane nanofiller compounds functionalized with hydrogen-bond acidic sensor groups was prepared, characterized by IR, 1 H-, 13 C-and 29 Si-NMR, and MALDI-TOF MS, and formulated into polymer coatings for 500 MHz surface acoustic wave sensor platforms. Sensor responses to the explosives simulant dinitrotoluene and to the nerve agent simulant dimethyl methylphosphonate were studied, and the performances of the polyhedral oligosilsesquioxane formulations were compared with those of conventional hydrogen-bond acidic linear surface acoustic wave sensor polymers carrying the same sensor groups. The polyhedral oligosilsesquioxane formulations gave good initial responses to the simulants, maintained 40-65% of their original response over a period of 6 months and maintained their sensitivity down to a simulant vapor concentration of 1 ppb v. The surface compositions of the surface acoustic wave sensor coatings were characterized by sum frequency generation spectroscopy.

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Visual-Empirical Region-of-Influence Pattern Recognition Applied to Chemical Microsensor Array Selection and Chemical Analysis

Cited by 46 publications

References 5 publications

Chemicapacitive microsensors for detection of explosives and TICs

Chemicapacitive microsensors for detection of explosives and TICs

In-Situ Chemiresistor Sensor Package for Real-Time Detection of Volatile Organic Compounds in Soil and Groundwater

Hydrogen‐bond acidic polyhedral oligosilsesquioxane filled polymer coatings for surface acoustic wave sensors

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