A methodology to detect explosive residues using a gelled ionic liquid based field-deployable electrochemical device

Hay, Catherine E.; Lee, Junqiao; Silvester, Debbie S.

doi:10.1016/j.jelechem.2020.114046

Cited by 10 publications

(9 citation statements)

References 31 publications

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“…Figure D illustrates the above-discussed procedure associated with the proposed paper sensor for sensing 10 μM TNT on a solid surface. A similar procedure was reported for the electrochemical detection of TNT on a solid surface. , Thus, a filter paper is suggested to be suitable for collecting a trace amount of TNT from a solid substrate. After completing the detection process, TNT molecules adsorbed on the surface of the paper sensor can be immediately devastated by burning (Figure E).…”

Section: Resultsmentioning

confidence: 95%

“…A similar procedure was reported for the electrochemical detection of TNT on a solid surface. 54,55 Thus, a filter paper is suggested to be suitable for collecting a trace amount of TNT from a solid substrate.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…Second, the free electrons in the PEI-FL-MnO 2 NSs can be excited from the valance band to the conduction band by raising the temperature (i.e., thermal energy). Considering that the Fermi levels of AuNPs, PdNPs, PtNPs, and MnO 2 were reported to be 5.1, 53 5.2, 54 5.65, 56 and 4.5 eV, 57,58 respectively, these excited electrons could be transferred from the MnO 2 surface to MNPs in the junction. Meanwhile, electron-deficient PEI-FL-MnO 2 NSs might serve as an electron acceptor for BH 4 − .…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Two in One: Poly(ethyleneimine)-Modified MnO₂ Nanosheets for Ultrasensitive Detection and Catalytic Reduction of 2,4,6-Trinitrotoluene and Other Nitro Aromatics

Kumar

Tseng

2021

ACS Sustainable Chem. Eng.

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The development of a portable sensor for on-site sensing of 2, 4, 6-trinitrotoluene (TNT) and other nitro aromatics (NAs) is still needed to strengthen environmental protection and public security. Herein, we report the fabrication of fluorescent few-layered MnO 2 nanosheets (FL-MnO 2 NSs) via N,N-dimethyl formamide-mediated ultrasonication and hydrothermal treatment. Electron and spectroscopy studies demonstrate that the modification of the FL-MnO 2 NSs (named as PEI-FL-MnO 2 NSs) with amine-rich polyethyleneimine (PEI) produced planar, β-phase, well-crystalline, and positively charged nanosheets. This PEIrelated surface modification not only improves the quantum yield of the FL-MnO 2 NSs from 7.6 to 13.2% but also provides multiple binding sites with nitro groups of NAs. It was found that the presence of TNT, as an example of NAs, efficiently quenched the fluorescence of the PEI-FL-MnO 2 NSs due to the formation of Meisenheimer complexes through the efficient adsorption process. In comparison to PEI-modified MnO 2 quantum dots, the PEI-FL-MnO 2 NSs exhibited relatively high sensitivity to TNT with a limit of detection of 20 pM. By depositing PEI-FL-MnO 2 NSs on a filter paper, the as-made paper sensor was capable of visualizing 10 nM TNT in drinking water and 10 μM TNT on a postal envelope through the appearance of a quenching spot under a UV lamp. Besides, the adsorbed PEI polymer enables the PEI-FL-MnO 2 NSs to electrostatically interact with citrate-capped metal nanoparticles, producing the composites for catalyzing NaBH 4 -mediated reduction of NAs. Since the PEI-FL-MnO 2 NSs possess a large surface area to capture NAs and serve as an electron acceptor for BH 4 − , the formed composites efficiently catalyze the reaction of NaBH 4 and NAs as compared to metal nanoparticles and PEI-FL-MnO 2 NSs alone.

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Section: Resultsmentioning

confidence: 95%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Two in One: Poly(ethyleneimine)-Modified MnO₂ Nanosheets for Ultrasensitive Detection and Catalytic Reduction of 2,4,6-Trinitrotoluene and Other Nitro Aromatics

Kumar

Tseng

2021

ACS Sustainable Chem. Eng.

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“…The presence of microcystin LR could be specifically quantified amperometrically by the immunosensor with the response time of less than 5 min, and a low LOD of 10.017 μg L −1 is achieved. Recently, portable electrode chips with Au‐working electrode have been introduced in electrochemical sensors (Hay et al., 2020). Gu et al.…”

Section: Portable Electrochemical Devicesmentioning

confidence: 99%

Recent advances in nanomaterial‐assisted electrochemical sensors for food safety analysis

Ren

et al. 2022

Food Frontiers

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Food safety as a public health issue has aroused worldwide concern. Food safety risks caused by the existence of food safety hazards in food may occur in all stages of the food supply chain. Thus, great emphasis is placed on sensitive, selective, and convenient analytical methods of various food safety hazards in food. At present, nanomaterials are at the forefront of various electrochemical sensing applications. Given their unique physical, chemical, and biological characteristics, nanomaterials are considered perfect candidates for the design of electrode surface to construct electrochemical sensors with excellent analytical performance. With the assistance of nanomaterials, electrochemical sensors are a potential alternative to conventional methods of food safety analysis. This review focuses on current research achievements of nanomaterial‐assisted electrochemical sensors for food safety analysis reported in recent 5 years. It highlights the different detection mechanisms for analytes, flexible sensing strategies based on nanomaterials, and portable miniaturized electrochemical devices. Finally, the challenges and limitations in the design of electrochemical sensors for food safety analysis are also discussed.

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“…Conventional methods include gas chromatography, liquid chromatography, ion chromatography, mass spectrometry, isotope ratio mass spectrometry, capillary electrophoresis, thermal analysis (thermogravimetry (TG) and differential scanning calorimetry (DSC)), molecular imprinting, general spectroscopic methods (fluorescence, luminescence, spectrophotometry, ultraviolet, and chemiluminescence), Fourier transform infrared spectroscopy, and Raman spectroscopy [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. For instance, Catherine E. Hay, et al [2] proposed a simple and robust, low-cost electrochemical device for the combined sampling and detection of the trace solid explosive 2,4,6-trinitrotoluene (TNT) from a non-porous surface, and the prototype device was able to detect TNT with a 30 min development time in different ambient environmental conditions. K. Hossny, et al [4] developed a framework to identify explosive materials using gamma spectra, and results emphasized the pipeline ability to identify the explosives with an accuracy of 92%.…”

Section: Introductionmentioning

confidence: 99%

Identification of Typical Solid Hazardous Chemicals Based on Hyperspectral Imaging

et al. 2021

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The identification of hazardous chemicals based on hyperspectral imaging is an important emergent means for the prevention of explosion accidents and the early warning of secondary hazards. In this study, we used a combination of spectral curve matching based on full-waveform characteristics and spectral matching based on spectral characteristics to identify the hazardous chemicals, and proposed a method to quantitatively characterize the matching degree of the spectral curves of hazardous chemicals. The results showed that the four hazardous chemicals, sulfur, red phosphorus, potassium permanganate, and corn starch had bright colors, distinct spectral curve characteristics, and obvious changes in reflectivity, which were easy to identify. Moreover, the matching degree of their spectral curves was positively correlated with their reflectivity. However, the spectral characteristics of carbon powder, strontium nitrate, wheat starch, and magnesium–aluminum alloy powder were not obvious, with no obvious characteristic peaks or trends of change in reflectivity. Except for the reflectivity and the matching degree of the carbon powder being maintained at a low level, the reflectivity of the remaining three samples was relatively close, so that it was difficult to identify with the spectral curves alone, and color information should be considered for further identification.

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A methodology to detect explosive residues using a gelled ionic liquid based field-deployable electrochemical device

Cited by 10 publications

References 31 publications

Two in One: Poly(ethyleneimine)-Modified MnO₂ Nanosheets for Ultrasensitive Detection and Catalytic Reduction of 2,4,6-Trinitrotoluene and Other Nitro Aromatics

Two in One: Poly(ethyleneimine)-Modified MnO₂ Nanosheets for Ultrasensitive Detection and Catalytic Reduction of 2,4,6-Trinitrotoluene and Other Nitro Aromatics

Recent advances in nanomaterial‐assisted electrochemical sensors for food safety analysis

Identification of Typical Solid Hazardous Chemicals Based on Hyperspectral Imaging

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A methodology to detect explosive residues using a gelled ionic liquid based field-deployable electrochemical device

Cited by 10 publications

References 31 publications

Two in One: Poly(ethyleneimine)-Modified MnO2 Nanosheets for Ultrasensitive Detection and Catalytic Reduction of 2,4,6-Trinitrotoluene and Other Nitro Aromatics

Two in One: Poly(ethyleneimine)-Modified MnO2 Nanosheets for Ultrasensitive Detection and Catalytic Reduction of 2,4,6-Trinitrotoluene and Other Nitro Aromatics

Recent advances in nanomaterial‐assisted electrochemical sensors for food safety analysis

Identification of Typical Solid Hazardous Chemicals Based on Hyperspectral Imaging

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Product

Resources

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Two in One: Poly(ethyleneimine)-Modified MnO₂ Nanosheets for Ultrasensitive Detection and Catalytic Reduction of 2,4,6-Trinitrotoluene and Other Nitro Aromatics

Two in One: Poly(ethyleneimine)-Modified MnO₂ Nanosheets for Ultrasensitive Detection and Catalytic Reduction of 2,4,6-Trinitrotoluene and Other Nitro Aromatics