Nanocrystalline ZnO coated fiber optic sensor for ammonia gas detection

Renganathan, B.; Sastikumar, D.; Gobi, G.; Yogamalar, N. Rajeswari; Bose, A. Chandra

doi:10.1016/j.optlastec.2011.04.008

Cited by 138 publications

(67 citation statements)

References 38 publications

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“…Due to this change, the light wave traveling through the removed and coated portion of the cladding experiences a change in the evanescent wave absorption [22]. When the gas is present the evanescent wave absorption may be higher or lower than the reference value [23]. In our case the sensor output light intensity increases with an increase in the concentration (Figs.…”

Section: Gas Sensing Mechanism In the Proposed Sensormentioning

confidence: 71%

“…The polished surface was cleaned, coated with Mn (10 wt%) doped SnO 2 by dip-coating method and then dried in air. The thickness of a coating was about 20 lm [18]. A conical flask was used as a gas chamber in which the fiber optic sensor region was inserted.…”

Section: Preparation Of Gas Sensor Regionmentioning

confidence: 99%

“…6 and 7 and the inset represents the magnified view of the spectra recorded in the range between 600 and 800 nm. In this plot, the Y-axis denotes the intensity, measured in counts, for each concentration of acetone [18]. The acetone concentration was increased from 0 to 500 ppm in increments of 50 ppm.…”

Section: Acetone Gas Sensing Propertymentioning

confidence: 99%

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Influence of Mn doping on structural, optical and acetone gas sensing properties of SnO2 nanoparticles by a novel microwave technique

Rajeshwaran¹,

Sivarajan

2014

J Mater Sci: Mater Electron

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In the present work we have successfully synthesized pristine and manganese (Mn) doped SnO 2 nanoparticles by using simple microwave irradiation technique for the first time. Powder X-ray diffraction results confirms that both the pure and doped SnO 2 in tetragonal rutile type structure. Transmission electron microscopy studies illustrate that both the undoped and Mn doped SnO 2 crystallites form in spherical shapes with an average diameter of 35-19 nm, which is in good agreement with the average crystallite sizes calculated by Scherrer's formula. A considerable red shift in the absorbing band edge was observed with increasing of Mn content (0-10 wt%) by using UVVis diffuse reflectance spectroscopy . Oxygen-vacancies, tin interstitial and structural defects were analyzed using photoluminescence spectroscopy. The functional groups were analyzed by using Fourier transform infrared spectra. Acetone gas sensing measurement of pure and Mn-doped (10 wt%) SnO 2 nanoparticles were experimented at ambient temperature using optical fiber based on clad modified method. By modifying the clad exposure to acetone vapor, the sensitivities were estimated to be 53 and 78 counts/ 100 ppm for undoped and Mn-doped SnO 2 nanoparticles, respectively. These results show that the Mn doping into SnO 2 enhances acetone gas sensing properties.

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Section: Gas Sensing Mechanism In the Proposed Sensormentioning

confidence: 71%

Section: Preparation Of Gas Sensor Regionmentioning

confidence: 99%

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Influence of Mn doping on structural, optical and acetone gas sensing properties of SnO2 nanoparticles by a novel microwave technique

Rajeshwaran¹,

Sivarajan

2014

J Mater Sci: Mater Electron

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“…Several techniques to detect ammonia gas have been proposed to date, such as metal oxide semiconductor detectors, infrared gas analyzers, chromatography-mass spectrometry, and optical fiber based sensors. However, the metal oxide semiconductor detectors exhibit enhanced sensitivity only at high temperatures, and also suffer from the poor selectivity [6]. Infrared gas analyzers have the disadvantages of being expensive and bulky [7].…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity Ammonia Gas Sensor Based on a Silica-Gel-Coated Microfiber Coupler

Sun

Semenova²,

et al. 2017

J. Lightwave Technol.

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(2017) High sensitivity ammonia gas sensor based on a silica gel coated microfiber coupler. Journal of Lightwave Technology, 35 (14 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.) > REPLACE THIS LINE WITH YOUR PAPER IDENTIFICATION NUMBER (DOUBLE-CLICK HERE TO EDIT) < 1 Abstract-In this paper, a high sensitivity ammonia gas sensor is proposed based on a silica gel coated microfiber coupler (MFC). The MFC structure is formed by the two tapered fibers with 3 μm waist diameter each, which were fabricated by using a customized microheater brushing technique. Silica gel coating was prepared by a sol-gel technique and applied on the surface of the MFC as a thin layer. The spectral characteristics of the proposed sensor were studied under various ammonia gas concentrations. The experimental results show that the coating thickness strongly affected the sensitivity of the MFC-based sensor to ammonia gas concentration. For the sensor with a 90 nm silica gel coating thickness, the highest measurement sensitivity is 2.23 nm/ppm for ammonia gas concentration, and the resolution is as good as 5 ppb, while the measured response and recovery times are about 50 and 35 seconds, respectively. Finally, it is demonstrated that the proposed sensor offers good repeatability and selectivity to ammonia.Index Terms-optical fiber sensors, microfiber coupler, ammonia gas sensor.

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“…[1][2][3] Many researchers develop novel materials to fabricate ammonia gas sensors. [4][5][6][7][8][9][10][11][12][13] Since the discovery of the catalytic effect of SnO2 in 1962, many studies have been conducted to improve sensor's functions. 14,15 Since proposed by Benzi in 1981 for the earth ice age disciplinarian explanation, 16 bistable dynamic model has been widely applied in fields, such as signal detection, electrical circuits, biological modeling, neural systems, et al [17][18][19][20] It is interesting that, under certain circumstances, an extra dose of noise can actually help the performance of some devices, by eliminating the internal noise in the system.…”

Section: Introductionmentioning

confidence: 99%

Ammonia quantitative analysis model based on miniaturized Al ionization gas sensor and non-linear bistable dynamic model

2015

Bioengineered

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To cite this article: Rongfei Ma (2015) Ammonia quantitative analysis model based on miniaturized Al ionization gas sensor and non-linear bistable dynamic model, Bioengineered, 6:3, 149-152, DOI: 10.1080/21655979.2015 Keywords: ammonia, Al plate sensor, gas sensor, gas ionization, non-linearIn this paper, ammonia quantitative analysis based on miniaturized Al ionization gas sensor and non-linear bistable dynamic model was proposed. Al plate anodic gas-ionization sensor was used to obtain the current-voltage (I-V) data. Measurement data was processed by non-linear bistable dynamics model. Results showed that the proposed method quantitatively determined ammonia concentrations.

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Nanocrystalline ZnO coated fiber optic sensor for ammonia gas detection

Cited by 138 publications

References 38 publications

Influence of Mn doping on structural, optical and acetone gas sensing properties of SnO2 nanoparticles by a novel microwave technique

Influence of Mn doping on structural, optical and acetone gas sensing properties of SnO2 nanoparticles by a novel microwave technique

High Sensitivity Ammonia Gas Sensor Based on a Silica-Gel-Coated Microfiber Coupler

Ammonia quantitative analysis model based on miniaturized Al ionization gas sensor and non-linear bistable dynamic model

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