Cavitand-Based Solid-Phase Microextraction Coating for the Selective Detection of Nitroaromatic Explosives in Air and Soil

Bianchi, Federica; Bedini, Alessandro; Riboni, Nicolò; Pinalli, Roberta; Gregori, Adolfo; Sidisky, Leonard M.; Dalcanale, Enrico; Careri, Maria

doi:10.1021/ac5025045

Cited by 31 publications

(12 citation statements)

References 65 publications

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“…Resorcin[4]arene cavitands have also been used as absorbent materials in preconcentrator devices coupled to a μ‐GC column for analyte separation. Furthermore, the detection of analytes was performed by a metal oxide gas sensor or mass spectrometer . In these examples, the detection limit for BTEX was found to be in the ppb range .…”

Section: Introductionmentioning

confidence: 99%

Deep Cavitand Self‐Assembled on Au NPs‐MWCNT as Highly Sensitive Benzene Sensing Interface

Clément

Korom

Struzzi

et al. 2015

Adv Funct Materials

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Keywords: quinoxaline-walled deep cavitand, multi-walled carbon nanotubes, oxygen plasma treatment, gold nanoparticle, benzene.The unprecedented sensitivity and partial selectivity of quinoxaline-walled thioether-legged deep cavitand functionalized multiwall carbon nanotubes toward traces of benzene vapors is presented. The cavitand is grafted onto gold nanoparticle (Au-NP) decorated oxygen plasma treated multiwall carbon nanotubes (O-MWCNT) by a self-assembled monolayer process affording a product referred to as cav-Au-MWCNT. The reported technique is suitable for the mass production of hybrid nanomaterials at low cost. The cav-Au-MWCNT resistive gas sensor operates at room temperature and shows an outstanding performance toward traces of benzene vapors. The detection of 2.5 ppb of benzene in dry air is demonstrated with a limit of detection (LOD) near 600 ppt. For the first time, it is shown that a CNT nanomaterial can effectively sense the extremely harmful benzene molecule with higher sensitivity than toluene or o-xylene at the trace levels. The cavitand is well suited for binding benzene, which, being in close proximity to the MWCNT, affects its density of states (DOS) shifting the Fermi level away from the valence band. The binding of benzene is transduced in a diminution of 2 MWCNT conductance. Furthermore, the inclusion of benzene is fully reversible at room temperature, implying that the sensor can operate at very low power consumption.

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Section: Introductionmentioning

confidence: 99%

Deep Cavitand Self‐Assembled on Au NPs‐MWCNT as Highly Sensitive Benzene Sensing Interface

Clément

Korom

Struzzi

et al. 2015

Adv Funct Materials

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“…Similar to what we highlighted for the study in environmental waters, a significant part of the research is aimed at the development and use of new, better-performing coatings, above all in terms of sensitivity and specificity ( Figure 1, Table 1). A cavitand-based SPME coating was synthesized and used for the selective determination of nitroaromatic explosives and explosive taggants at ultratrace levels [92]. Among the most used materials, the MOFs have a leading role.…”

Section: Soilmentioning

confidence: 99%

Recent Applications and Newly Developed Strategies of Solid-Phase Microextraction in Contaminant Analysis: Through the Environment to Humans

Naccarato

Tagarelli

2019

Separations

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The present review aims to describe the recent and most impactful applications in pollutant analysis using solid-phase microextraction (SPME) technology in environmental, food, and bio-clinical analysis. The covered papers were published in the last 5 years (2014–2019) thus providing the reader with information about the current state-of-the-art and the future potential directions of the research in pollutant monitoring using SPME. To this end, we revised the studies focused on the investigation of persistent organic pollutants (POPs), pesticides, and emerging pollutants (EPs) including personal care products (PPCPs), in different environmental, food, and bio-clinical matrices. We especially emphasized the role that SPME is having in contaminant surveys following the path that goes from the environment to humans passing through the food web. Besides, this review covers the last technological developments encompassing the use of novel extraction coatings (e.g., metal-organic frameworks, covalent organic frameworks, PDMS-overcoated fiber), geometries (e.g., Arrow-SPME, multiple monolithic fiber-SPME), approaches (e.g., vacuum and cold fiber SPME), and on-site devices. The applications of SPME hyphenated with ambient mass spectrometry have also been described.

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“…The selectivity in aromatic uptake can be further differentiated by introducing additional interaction modes at the upper rim of the cavity. This has been obtained for nitro aromatic compounds by introducing a carboxylic group on top of the cavity to add additional H‐bonding with the nitro groups to the already present ability of the cavity to engulf aromatic compounds (Figure , QxCavCOOH) . The SPME fibers coated with QxCavCOOH showed a remarkable selectivity toward nitro aromatic explosives like TNT (trinitrotoluene) and its taggants like DNT (dinitrotoluene) and p ‐nitrotoluene.…”

Section: Volatile Organic Compounds (Vocs) Detectionmentioning

confidence: 99%

Environmental Gas Sensing with Cavitands

Pinalli

Pedrini

Dalcanale

2017

Chemistry A European J

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Environmental gas sensing needs stringent sensor requirements in terms of sensitivity, selectivity and ruggedness. One of the major issues to be addressed is combining in a single device the conflicting requirements of molecular-level selectivity and low-ppb sensitivity. The exploitation of synthetic molecular receptors as sensing materials is particularly attractive to address the selectivity issue, to single out the desired analytes in the presence of overwhelming amounts of interferents. This minireview summarizes the strategies in environmental gas and vapor sensing using molecular receptors as selective hosts for specific analytes, with the main focus on cavitands. In particular, we highlight the use of these macrocycles as selective preconcentrator units to be integrated into portable devices for environmental monitoring. Depending on the class of analytes to be detected, the molecular recognition properties of cavitands can be manipulated through the proper choice of the bridging groups at the upper rim, and their transducer integration can be implemented through the manifold functionalization options at the lower rim.

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Cavitand-Based Solid-Phase Microextraction Coating for the Selective Detection of Nitroaromatic Explosives in Air and Soil

Cited by 31 publications

References 65 publications

Deep Cavitand Self‐Assembled on Au NPs‐MWCNT as Highly Sensitive Benzene Sensing Interface

Deep Cavitand Self‐Assembled on Au NPs‐MWCNT as Highly Sensitive Benzene Sensing Interface

Recent Applications and Newly Developed Strategies of Solid-Phase Microextraction in Contaminant Analysis: Through the Environment to Humans

Environmental Gas Sensing with Cavitands

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