Ratiometric chemodosimeter: an organic-nanofiber platform for sensing lethal phosgene gas

Maiti, Kalipada; Ghosh, Debidas; Maiti, Rituparna; Vyas, Veena; Datta, Pallab; Mandal, Debabrata; Maiti, Dilip K.

doi:10.1039/c8ta10481f

Cited by 60 publications

(34 citation statements)

References 112 publications

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“…Algorithm: Proposed Algorithm by combining Quegan's and Ainsworth's algorithms (Maiti, 2019) Input : Covariance matrix C 0 , precision threshold ε and maximum allowed iterations i max Output: Crosstalk parameters u, v, w, z and channel imbalance parameter α 1 Estimate q from C using equation 9c…”

Section: Manuscript Submitted To Earth and Space Sciencementioning

confidence: 99%

A Computationally Efficient Hybrid Framework for Polarimetric Calibration of Quad‐Pol SAR Data

Maiti

Kumar

Tolpekin³

et al. 2021

Earth and Space Science

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Polarimetric Synthetic Aperture Radar (PolSAR) calibration is an essential preprocessing step that must be performed to ensure that the data quality is adequate. This, in turn, helps to minimise the propagation of errors in any further data processing or information extraction. Crosstalk and channel imbalance are two major distortions found to be present in the uncalibrated polarimetric SAR data. The PolSAR calibration mainly aims to reduce these two distortions revealing the true scattering pattern of the targets. In this regard, Quegan's algorithm and Ainsworth algorithm are two widely used algorithms for the PolSAR calibration. In this research, the accuracy and efficiency of these two algorithms have been thoroughly compared using suitable metrics. It has been shown that the Ainsworth algorithm performs better than Quegan's in terms of accuracy at the cost of poor computational efficiency. The data quality metrics also highlight the better calibration accuracy of the Ainsworth algorithm. The issue of higher computational complexity has been effectively addressed by coupling both of these algorithms. Evidently, the computational cost has been reduced in the case of the proposed algorithm. The polarisation orientation angle (POA) shift is another distortion caused by the topographic variations present in the target scene. Therefore, correction of POA shift has been incorporated in this research by coupling it with the PolSAR calibration. Subsequently, the improvement in the scattering has been observed. In essence, the proposed algorithm coupled with the correction of POA shift rectifies the major polarimetric distortions with adequate accuracy and computational efficiency.

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Section: Manuscript Submitted To Earth and Space Sciencementioning

confidence: 99%

A Computationally Efficient Hybrid Framework for Polarimetric Calibration of Quad‐Pol SAR Data

Maiti

Kumar

Tolpekin³

et al. 2021

Earth and Space Science

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“…Due to their low cost, specificity, high sensitivity, and ease of use, many fluorescent probes for phosgene have been reported [5] with two nucleophilic groups as the active site for the reaction, o ‐diamine (including one amine plus one o ‐aromatic nitrogen), [6a–y] one amine plus one o ‐hydroxy group, [7a–c] o ‐dihydroxy [8] group and others, [9a–l] and summarized in Table S1 in the Supporting Information. Among the largest class of probes, with o ‐phenylenediamine as the active site, would produce a similar fluorescence response to nitric oxide (NO), [6e, f] which induces o ‐phenylenediamine to form benzotriazole [10] …”

Section: Introductionmentioning

confidence: 99%

Sensitive and Visual Detection of Phosgene by a TICT‐Based BODIPY Dye with 8‐(o‐Hydroxy)aniline as the Active Site

Chong

et al. 2021

Chemistry A European J

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Phosgene and its substitutes (diphosgene and triphosgene) are widely utilized as chemical industrial materials and chemical warfare agents and pose a threat to public health and environmental safety due to their extreme toxicity. Research efforts have been directed to develop selective and sensitive detection methods for phosgene and its substitutes. In this paper, we have prepared two BODIPY‐based fluorescent probes, o‐Pah and o‐Pha, which are two isomers with different active sites, ortho‐aminohydroxy (3′,4′ or 4′,3′) phenyls at meso position of BODIPY, and compared their sensing performance toward triphosgene. The probe with o‐(4′‐amino‐3′‐hydroxyl), o‐Pha, exhibits better sensing performance over the o‐(3′‐amino‐4′‐hydroxyl), o‐Pah, for instance, a lower limit of detection (LOD) (0.34 nm vs. 1.2 nm), and more rapid response (10 s vs. 200 s). Furthermore, based on the above comparative studies, a red‐fluorescence probe o‐Phae has been constructed through extending 3,5‐conjugation of o‐Pha. The probe o‐Phae displays rapid response (60 s), high sensitivity to triphosgene (LOD=0.88 nm), and high selectivity for triphosgene over relevant analytes including nitric oxide. Finally, a facile test strip for phosgene was fabricated by immobilizing o‐Phae in a polyethylene oxide membrane for sensitive (<2 ppm) and selective detection of phosgene in the gas phase.

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“…Volatile organic compounds (VOCs) are the well-known cause of indoor pollution, which can harm the human health and leads to various disorders [ 1 , 2 , 3 ]. Long-time exposure to VOCs, such as phosgene, can lead to death and severe chronic diseases [ 4 , 5 ]. Another example is Benzene (a well-known carcinogen), which have the great potential to damage human tissues such as spleen, stomach, liver, kidneys, etc., and also affect the nervous, circulatory, immune, cardiovascular, and reproductive and respiratory systems [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

Shellaiah

Sun

2021

Sensors

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Environmental pollution related to volatile organic compounds (VOCs) has become a global issue which attracts intensive work towards their controlling and monitoring. To this direction various regulations and research towards VOCs detection have been laid down and conducted by many countries. Distinct devices are proposed to monitor the VOCs pollution. Among them, chemiresistor devices comprised of inorganic-semiconducting materials with diverse nanostructures are most attractive because they are cost-effective and eco-friendly. These diverse nanostructured materials-based devices are usually made up of nanoparticles, nanowires/rods, nanocrystals, nanotubes, nanocages, nanocubes, nanocomposites, etc. They can be employed in monitoring the VOCs present in the reliable sources. This review outlines the device-based VOC detection using diverse semiconducting-nanostructured materials and covers more than 340 references that have been published since 2016.

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Ratiometric chemodosimeter: an organic-nanofiber platform for sensing lethal phosgene gas

Abstract: The fabrication of organic nanofibrils using 3-oxime-4-hydroxy-1,8-naphthalic-n-butylimide (R1)-doped polycaprolactone (PCL) electrospun, which is developed as a gaseous phosgene-specific sensing device.

Cited by 60 publications

References 112 publications

A Computationally Efficient Hybrid Framework for Polarimetric Calibration of Quad‐Pol SAR Data

A Computationally Efficient Hybrid Framework for Polarimetric Calibration of Quad‐Pol SAR Data

Sensitive and Visual Detection of Phosgene by a TICT‐Based BODIPY Dye with 8‐(o‐Hydroxy)aniline as the Active Site

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

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