Acoustic Wave Microsensor Arrays for Vapor Sensing

Grate, Jay W.

doi:10.1021/cr980094j

Cited by 387 publications

(312 citation statements)

References 186 publications

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“…Chen et al showed a quartz SAW NH3 sensor with a Pt doped polypyrrole sensitive film, and they attributed the positive frequency shift to the variation of conductivity of film [31]. Similar work about either positive or negative frequency shift of the SAW NH3 sensor has been reported in many references [32][33][34].…”

Section: Introductionmentioning

confidence: 57%

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

Tang

et al. 2018

Sensors and Actuators B: Chemical

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. and SiO2-TiO2 films showed positive frequency shifts, whereas SiO2 film exhibits a negative frequency shift to NH3 gas. it is believed that the negative frequency shift was mainly caused by the increase of NH3 mass loading on the sensitive film while the positive frequency shift was associated to the condensation of the hydroxyl groups (-OH) on the film making the film stiffer and lighter, when exposed to NH3 gas. It demonstrated that humidity played a significant factor on the sensing performance. Comparative studies exhibited that the sensor based on the composite SiO2-TiO2 film had a much better sensitivity to NH3 at a low concentration level (1 ppm) with a response of 2 KHz, and also showed fast response and recovery, excellent selectivity, stability and reproducibility. Accepted Manuscript

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Section: Introductionmentioning

confidence: 57%

NH3 sensing property and mechanisms of quartz surface acoustic wave sensors deposited with SiO2, TiO2, and SiO2-TiO2 composite films

Tang

et al. 2018

Sensors and Actuators B: Chemical

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“…Materials applied range from conventional chromatographic stationary phases and polymers to such unusual materials as soot extracts 49 as well as structured materails such as bullfrog olfactory receptor proteins, dendimers and cavitands.…”

Section: Polymer-coated Saw Sensormentioning

confidence: 99%

Landmine Detection Technologies to Trace Explosive Vapour Detection Techniques

Kapoor

Kannan

2007

DSJ

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Large quantity of explosive is manufactured worldwide for use in various types of ammunition, arms, and mines, and used in armed conflicts. During manufacturing and usage of the explosive equipment, some of the explosive residues are released into the environment in the form of contaminated effluents, unburnt explosives fumes and vapours. Limited but uncontrolled continuous release of trace vapours also takes place when explosive-laden landmines are deployed in the field. One of the major technological challenges in post-war scenario worldwide is the detection of landmines using these trace vapour signatures and neutralising them safely. Different types of explosives are utilised as the main charge in antipersonnel and antitank landmines. In this paper, an effort has been made to review the techniques so far available based on explosive vapour detection especially to detect the landmines. A comprehensive compilation of relevant information on the techniques is presented, and their maturity levels, shortcomings, and difficulties faced are highlighted.

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“…The field of artificial olfaction and gas determination is one of the fastest growing areas of sensing both commercially and within academic research areas [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Much of the work in this field to date concentrates on identification and quantification of multiple analyte species by employing miniaturised sensors.…”

Section: Introductionmentioning

confidence: 99%

“…Electronic nose systems have been produced using a variety of different sensor types, including surface acoustic wave devices, [1][2][3] conducting polymers, [4][5][6] metal oxide semiconductors, [7] carbon black/polymer composite gas sensors, [8][9][10] and fluorescent microspheres [11][12][13]. In the work presented here, we have chosen to explore the area of 3 optical sensor arrays based upon the use of solvatochromic dyes.…”

Section: Introductionmentioning

confidence: 99%