A new strategy for selective detection of nitrated explosives based on a confinement effect of nanocavity

Wang, Zhu; Wang, Chen; Li, Weina; Tao, Cheng‐an; Cui, Jiecheng; Yang, Haowei; Jiang, Yu; Li, Guangtao

doi:10.1039/c3ta11881a

Cited by 9 publications

(53 citation statements)

References 48 publications

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“…19A). 203,204 Depending on the electronic structures and sizes of explosive compounds, the fluorescence of the naphthalene core would be quenched or enhanced to different extents, leading to direct detection and discrimination of different explosives in the vapor phase (Fig. 19B).…”

Section: Cucurbits[n] Urils Cucurbit[n] Urils (Cb[n]mentioning

confidence: 99%

Fluorescence based explosive detection: from mechanisms to sensory materials

2015

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The detection of explosives is one of the current pressing concerns in global security. In the past few decades, a large number of emissive sensing materials have been developed for the detection of explosives in vapor, solution, and solid states through fluorescence methods. In recent years, great efforts have been devoted to develop new fluorescent materials with various sensing mechanisms for detecting explosives in order to achieve super-sensitivity, ultra-selectivity, as well as fast response time. This review article starts with a brief introduction on various sensing mechanisms for fluorescence based explosive detection, and then summarizes in an exhaustive and systematic way the state-of-the-art of fluorescent materials for explosive detection with a focus on the research in the recent 5 years. A wide range of fluorescent materials, such as conjugated polymers, small fluorophores, supramolecular systems, bio-inspired materials and aggregation induced emission-active materials, and their sensing performance and sensing mechanism are the centerpiece of this review. Finally, conclusions and future outlook are presented and discussed.

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Section: Cucurbits[n] Urils Cucurbit[n] Urils (Cb[n]mentioning

confidence: 99%

Fluorescence based explosive detection: from mechanisms to sensory materials

2015

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“…That is, if the analyte quenches the fluorescence then the interferent must either not decrease the fluorescence or show an increase. If the response of the interferent and analyte are similar, for example, they both quench the luminescence, it will be extremely difficult to differentiate between them 5 20 , regardless of their quenching efficiency. That is, a low concentration of a strong quencher and a high concentration of a weak quencher can be expected to change the fluorescence in a similar manner.…”

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confidence: 99%

Unambiguous detection of nitrated explosive vapours by fluorescence quenching of dendrimer films

et al. 2015

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Unambiguous and selective standoff (non-contact) infield detection of nitro-containing explosives and taggants is an important goal but difficult to achieve with standard analytical techniques. Oxidative fluorescence quenching is emerging as a high sensitivity method for detecting such materials but is prone to false positives—everyday items such as perfumes elicit similar responses. Here we report thin films of light-emitting dendrimers that detect vapours of explosives and taggants selectively—fluorescence quenching is not observed for a range of common interferents. Using a combination of neutron reflectometry, quartz crystal microbalance and photophysical measurements we show that the origin of the selectivity is primarily electronic and not the diffusion kinetics of the analyte or its distribution in the film. The results are a major advance in the development of sensing materials for the standoff detection of nitro-based explosive vapours, and deliver significant insights into the physical processes that govern the sensing efficacy.

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“…NaCl was purchased from Kanto Chemical. Cucurbit [7]uril (CB [7]) was synthesized according to the literature. 29 All chemicals were used as received without further purification.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…ITC experiments were carried out in water (unbuffered) on a VP-ITC from Microcal, Inc., at 25 °C. The binding equilibria were studied using a cellular guest (DNT) concentration of 0.1 mM, to which a 1.0 mM CB [7] solution was titrated. Typically, 27 consecutive injections of 10 μL were used.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Selective Detection of Nitroexplosives Using Molecular Recognition within Self-Assembled Plasmonic Nanojunctions

et al. 2019

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We demonstrate that the reproducibility of sensors for nitroaromatics based on surface-enhanced Raman spectroscopy (SERS) can be significantly improved via a hierarchical aqueous self-assembly approach mediated by the multifunctional macrocyclic molecule cucurbit[7]uril (CB[7]). Our approach is enabled by the novel host–guest complexation between CB[7] and an explosive marker 2,4-dinitrotoluene (DNT). Binding studies are performed using experimental and computation techniques to quantify key binding parameters for the first time. This supramolecular complexation allows DNT to be positioned in close proximity to the plasmonic hotspots within aggregates of CB[7] and gold nanoparticles, resulting in significant SERS signals with a detection limit of ∼1 μM. The supramolecular ensemble is selective against a structurally similar nitroaromatics owing to the molecular-recognition nature of the complexation as well as tolerant against the presence of model organic contaminants that bind strongly to the SERS substrates.

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A new strategy for selective detection of nitrated explosives based on a confinement effect of nanocavity

Cited by 9 publications

References 48 publications

Fluorescence based explosive detection: from mechanisms to sensory materials

Fluorescence based explosive detection: from mechanisms to sensory materials

Unambiguous detection of nitrated explosive vapours by fluorescence quenching of dendrimer films

Selective Detection of Nitroexplosives Using Molecular Recognition within Self-Assembled Plasmonic Nanojunctions

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