Water-responsive carbon nanotubes for selective detection of toxic gases

Mukherjee, Soumalya; Sakorikar, Tushar; Mukherjee, Anwesha; Misra, Abha

doi:10.1063/1.4916211

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…Since the pioneering work reporting on the response of a CNTFET for ammonia and NO 2 exposures, there have been a large number of studies on the use of carbon nanotubes for sensing gases and vapors . The subject coverage includes a wide range of topics: types of nanotubes (SWCNTs, MWCNTs), doping/coating/metal loading/functionalization strategies, different gases and vapors, different transduction approaches (electrical, optical, etc.…”

Section: Cnt‐based Chemsensors: a Status Updatementioning

confidence: 99%

Carbon Nanotube‐Based Chemical Sensors

Meyyappan

2016

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177

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The need to sense gases and vapors arises in numerous scenarios in industrial, environmental, security and medical applications. Traditionally, this activity has utilized bulky instruments to obtain both qualitative and quantitative information on the constituents of the gas mixture. It is ideal to use sensors for this purpose since they are smaller in size and less expensive; however, their performance in the field must match that of established analytical instruments in order to gain acceptance. In this regard, nanomaterials as sensing media offer advantages in sensitivity, preparation of chip-based sensors and construction of electronic nose for selective detection of analytes of interest. This article provides a review of the use of carbon nanotubes in gas and vapor sensing.

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Section: Cnt‐based Chemsensors: a Status Updatementioning

confidence: 99%

Carbon Nanotube‐Based Chemical Sensors

Meyyappan

2016

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177

122

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“…Too much dissolved CO 2 in the ocean could cause increased acidity, the destruction of coral reefs, or the significant expansion of anoxic dead zones [4]. Excessive dissolved ammonia would lead to the rapid growth of algae and the eutrophication phenomenon, and then the reduction of dissolved oxygen would deteriorate the fragile aquatic ecosystem [5]. Therefore, large-scale direct in-situ sensing is needed to qualitatively detect dissolved gas concentrations in aquatic environments and expand the spatial-resolution data set.…”

Section: Introductionmentioning

confidence: 99%

Direct Measurement of Dissolved Gas Using a Tapered Single-Mode Silica Fiber

Sun,

Hu,

Zhu

et al. 2024

Sensors

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Dissolved gases in the aquatic environment are critical to understanding the population of aquatic organisms and the ocean. Currently, laser absorption techniques based on membrane separation technology have made great strides in dissolved gas detection. However, the prolonged water–gas separation time of permeable membranes remains a key obstacle to the efficiency of dissolved gas analysis. To mitigate these limitations, we demonstrated direct measurement of dissolved gas using the evanescent-wave absorption spectroscopy of a tapered silica micro-fiber. It enhanced the analysis efficiency of dissolved gases without water–gas separation or sample preparation. The feasibility of this sensor for direct measurement of dissolved gases was verified by taking the detection of dissolved ammonia as an example. With a sensing length of 5 mm and a consumption of ~50 µL, this sensor achieves a system response time of ~11 min and a minimum detection limit (MDL) of 0.015%. Possible strategies are discussed for further performance improvement in in-situ applications requiring fast and highly sensitive dissolved gas sensing.

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“…MMONIA (NH3) has been extensively used in many areas such as industrial coolant systems, fertilizer production, and clinical diagnostics [1][2][3]. However, even low concentrations of NH3 may pose a hazard to human health.…”

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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Water-responsive carbon nanotubes for selective detection of toxic gases

Cited by 7 publications

References 30 publications

Carbon Nanotube‐Based Chemical Sensors

Carbon Nanotube‐Based Chemical Sensors

Direct Measurement of Dissolved Gas Using a Tapered Single-Mode Silica Fiber

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

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