Fabrication, Characterization and Application of ZnO Nanostructure-Based Micro-Preconcentrator for TNT Sensing

Tiwary, Nikhilendu; Vinchurkar, Madhuri; Patel, Mihir; Nathawat, Rashi; Pandey, Swapnil; Rao, V. Ramgopal

doi:10.1109/jmems.2016.2600631

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…For trace collection of polluting materials like explosives in the environment, a method known as "preconcentration" can be used [7][8][9][10]. Preconcentrator materials typically have a certain affinity to a specific, or class of, compounds, allowing them to be sorbed to the preconcentrator surface over time.…”

Section: Passive Methodsmentioning

confidence: 99%

Honeybee Activity Monitoring in a Biohybrid System for Explosives Detection

et al. 2019

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Free-flying honeybees can electrostatically collect particles from air in the flying and foraging areas, which in conjunction with organic-based explosive vapor sensing films, placed at the entrance to the beehive, can be used as a passive explosive sensing mechanism. Moreover, bees can be trained to actively search for a smell of explosive. Using trained honeybees in conjunction with a system for honeybee localization enables generation of a spatial-time honeybee density map, where the most visited places point to suspicious areas. In both methods (passive and active), bees' activity monitoring plays a significant role, providing information about environmental parameters and activities of bees at the entrance and exit of a beehive. In this paper we present the design and realization of an electronic system for bee activity monitoring at the front of a hive while using bees for explosive detection. The system also monitors air temperature and relative humidity. Results obtained to date from activity monitoring are useful in planning testing activities within our active and passive method, as it can determine the optimal period of the day and environmental parameters in which bees are most active.

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Section: Passive Methodsmentioning

confidence: 99%

Honeybee Activity Monitoring in a Biohybrid System for Explosives Detection

et al. 2019

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“…Later, Tiwary et al experimented with 100 nm diameter zinc oxide (ZnO) nanorods of 4-5 μm length for the adsorption and desorption of trinitrotoluene (TNT) vapor. [50] These nanorods were seeded on SiO 2 made out of p-type silicon by sputtering followed by hydrothermal growth. This ZnO and SiO 2 system was tested under different conditions with nitrogen as the carrier gas.…”

Section: Oxide-based Preconcentratorsmentioning

confidence: 99%

“…There is as wide diversity in the gas detection methods used in conjunction with preconcentration technologies as there is in the preconcentrator materials themselves. Many preconcentrator studies use GC-MS [38,50,51,100] for gas detection and measurement. However, several other gas detection techniques have also been used, as displayed in Table 2.…”

Section: Gas Detection Technologies Used With Preconcentratorsmentioning

confidence: 99%

A Review of Preconcentrator Materials, Flow Regimes and Detection Technologies for Gas Adsorption and Sensing

Chowdhury

Lee

Day

et al. 2022

Adv Materials Inter

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of gases on solid surfaces. [9] This understanding aided the pioneering development of the first preconcentrator in 1969 by Dave et al. [10] This first preconcentrator utilized a polymer as the material for adsorption and desorption. Later, the first carbonaceous preconcentrator was developed in 1975 by Russell et al. [11] Until 1979, most preconcentration research relied on large instrumentation for analyte detection. However, in 1979, the development of the first micro gas chromatography (μGC) demonstrated that miniature detection methods are also possible. [12] The term "preconcentrator" was not used until 1989 by Thomas et al. [13] Later, the usability of oxide materials for preconcentration was explored; Casalnuovo et al. reported a SiO 2 based preconcentrator in 2001. [14] Ueno et al. introduced a metal-organic framework (MOF) based preconcentrator in 2007. [15] These major advances in preconcentrator development are shown in a timeline in Figure 1. The number of publications containing the term "gas preconcentrator," "gas pre concentrator," "gas pre-concentrator," "VOC preconcentrator" over time since 1989 is shown in Figure 2.In this review, recent developments of gas preconcentrators, preconcentrator materials, and preconcentration techniques are summarized. Different materials, their recent uses, limitations, and future potential are reviewed and discussed.

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“…These have been successfully developed for highly-sensitive Surface Acoustic Wave sensors for hazardous targets including nerve agents and radionuclides (Grate, 2008), and for HPLC columns applied to environmental monitoring (Egorov et al, 2006;Grate et al, 2007). These polymers effectively act as a "magnet" for the explosives, whereby the nitroaromatic compound adsorbs to the surface, and the application of heat leads to thermal desorption (Camara et al, 2014;Martin et al, 2007;Serrano et al, 2013;Tiwary et al, 2016;Voiculescu et al, 2006), as shown in Figure 2. The specially designed materials studied in the literature for this purpose are usually expensive (approx.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Preconcentration techniques for trace explosive sensing

Gillanders

Glackin

Filipi

et al. 2019

Science of The Total Environment

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Trace sensing of explosive vapours is a method in humanitarian demining and Improvised Explosives Device (IED) detection that has received increasing attention recently, since accurate, fast, and reliable chemical detection is highly important for threat identification.However, trace molecule sampling in the field can be extremely difficult due to factors including weather, locale, and very low vapour pressure of the explosive. Preconcentration of target molecules onto a substrate can provide a method to collect higher amounts of analyte for analysis. We used the commercial fluoropolymer Aflas as a preconcentrator material to sorb explosive molecules to the surface, allowing subsequent detection of the explosives via the luminescence quenching response from the organic polymer Super ACCEPTED MANUSCRIPTHighlights  Trace detection of explosive vapours is challenging in real-world environments. By "preconcentrating" trace vapours onto solid substrates, higher amounts can be collected for detection. Our approach combines fluoropolymer preconcentrators, free-flying honeybees for sampling, and luminescent thin films as the sensing mechanism. The inexpensive, commercially-available fluoropolymer Aflas has shown good preconcentration abilities for 2,4-DNT which is typically found in landmines. Laboratory results and initial field results indicate this method is a very promising tool for the detection of trace explosive vapours in contaminated land.

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Fabrication, Characterization and Application of ZnO Nanostructure-Based Micro-Preconcentrator for TNT Sensing

Cited by 8 publications

References 25 publications

Honeybee Activity Monitoring in a Biohybrid System for Explosives Detection

Honeybee Activity Monitoring in a Biohybrid System for Explosives Detection

A Review of Preconcentrator Materials, Flow Regimes and Detection Technologies for Gas Adsorption and Sensing

Preconcentration techniques for trace explosive sensing

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