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Shukla AK, Sisodiya DS, Savita, Chattopadhyay A, Bhattacharya A. To Quench or Not: Extending a β-Carboline Fluorophore for TNT Detection in Aqueous Media via Simultaneous ESPT Destabilization and AIE. J Phys Chem B 2023; 127:10025-10034. [PMID: 37944033 DOI: 10.1021/acs.jpcb.3c05936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
Molecules relying on the excited-state intramolecular proton transfer/excited-state proton transfer (ESIPT/ESPT) mechanism are widely used in material science. In the current work, a known β-carboline-based probe TrySy was used to selectively detect explosive trinitrotoluene (TNT) in water. Compared to conventional TNT sensing, which relies mainly on the quenching of the fluorescence signal, TrySy could perform nanomolar detection of TNT via ESPT destabilization and AIE, with a significant fluorescence output. The mechanism followed was validated by computational and experimental results.
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Affiliation(s)
- Adarash Kumar Shukla
- Department of Chemistry, Birla Institute of Technology and Science-Pilani (Hyderabad Campus), Hyderabad 500078, India
| | - Dilawar Singh Sisodiya
- Department of Chemistry, Birla Institute of Technology and Science-Pilani (KK Birla Goa Campus), NH 17B, Bypass, Road, Zuarinagar, Sancoale 403726, Goa, India
| | - Savita
- Department of Chemistry, Birla Institute of Technology and Science-Pilani (Hyderabad Campus), Hyderabad 500078, India
| | - Anjan Chattopadhyay
- Department of Chemistry, Birla Institute of Technology and Science-Pilani (KK Birla Goa Campus), NH 17B, Bypass, Road, Zuarinagar, Sancoale 403726, Goa, India
| | - Anupam Bhattacharya
- Department of Chemistry, Birla Institute of Technology and Science-Pilani (Hyderabad Campus), Hyderabad 500078, India
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2
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Kong W, Liu M, Zhang J, Wu H, Wang Y, Su Q, Li Q, Zhang J, Wu C, Zou WS. Room-temperature phosphorescence and fluorescence nanocomposites as a ratiometric chemosensor for high-contrast and selective detection of 2,4,6-trinitrotoluene. Anal Chim Acta 2023; 1282:341930. [PMID: 37923408 DOI: 10.1016/j.aca.2023.341930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 10/15/2023] [Accepted: 10/16/2023] [Indexed: 11/07/2023]
Abstract
Reports on using complementary colours for high-contrast ratiometric assays are limited to date. In this work, graphitized carbon nitride (g-C3N4) nanosheets and mercaptoethylamine (MEA) capped Mn-doped ZnS QDs were fabricated by liquid exfoliation of bulk g-C3N4, and by a coprecipitation and postmodification strategies, respectively. Mn-doped ZnS quantum dots were deposited onto g-C3N4 nanosheets through an electrostatic self-assembly to form new nanocomposites (denoted as Mn-ZnS QDs@g-C3N4). Mn-ZnS QDs@g-C3N4 can emit a pair of complementary colour light, namely, orange room-temperature phosphorescence (RTP) at 582 nm and blue fluorescence at 450 nm. After 2,4,6-trinitrotoluene (TNT) dosing into Mn-ZnS QDs@g-C3N4 aqueous solution, and pairing with MEA to generate TNT anions capable of quenching the emission of Mn-doped ZnS QDs, the fluorescence colours of the solution changed from orange to blue across white, exhibiting unusual high-contrast fluorescence images. The developed ratiometric chemosensor showed very good linearity in the range of 0-12 μM TNT with a limit of detection of 0.56 μM and an RSD of 6.4 % (n = 5). Also, the ratiometric probe had an excellent selectivity for TNT over other nitroaromatic compounds, which was applied in the ratiometric test paper to image TNT in water, and TNT sensing under phosphorescence mode to efficiently avoid background interference. A high-contrast dual-emission platform for selective ratiometric detection of TNT was therefore established.
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Affiliation(s)
- Weili Kong
- School of Materials and Chemical Engineering, Key Laboratory of Functional Molecule Design and Interface Procedure, Anhui Jianzhu University, Hefei, 230022, China
| | - Meina Liu
- School of Materials and Chemical Engineering, Key Laboratory of Functional Molecule Design and Interface Procedure, Anhui Jianzhu University, Hefei, 230022, China
| | - Jinhui Zhang
- School of Materials and Chemical Engineering, Key Laboratory of Functional Molecule Design and Interface Procedure, Anhui Jianzhu University, Hefei, 230022, China
| | - Hongbo Wu
- School of Chemical Engineering, Anhui University of Science and Technology, Huainan, 232001, China
| | - Yaqin Wang
- School of Materials and Chemical Engineering, Key Laboratory of Functional Molecule Design and Interface Procedure, Anhui Jianzhu University, Hefei, 230022, China.
| | - Qin Su
- School of Materials and Chemical Engineering, Key Laboratory of Functional Molecule Design and Interface Procedure, Anhui Jianzhu University, Hefei, 230022, China
| | - Qin Li
- School of Materials and Chemical Engineering, Key Laboratory of Functional Molecule Design and Interface Procedure, Anhui Jianzhu University, Hefei, 230022, China
| | - Jun Zhang
- School of Materials and Chemical Engineering, Key Laboratory of Functional Molecule Design and Interface Procedure, Anhui Jianzhu University, Hefei, 230022, China; New Energy Photovoltaic Industry Research Center, Qinghai University, Xining, 810016, China
| | - Chengli Wu
- School of Chemical Engineering, Anhui University of Science and Technology, Huainan, 232001, China.
| | - Wen-Sheng Zou
- School of Materials and Chemical Engineering, Key Laboratory of Functional Molecule Design and Interface Procedure, Anhui Jianzhu University, Hefei, 230022, China.
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Sharma B, Gadi R. Analytical Tools and Methods for Explosive Analysis in Forensics: A Critical Review. Crit Rev Anal Chem 2023:1-27. [PMID: 37934616 DOI: 10.1080/10408347.2023.2274927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
This review summarizes (i) compositions and types of improvised explosive devices; (ii) the process of collection, extraction and analysis of explosive evidence encountered in explosive and related cases; (iii) inter-comparison of analytical techniques; (iv) the challenges and prospects of explosive detection technology. The highlights of this study include extensive information regarding the National & International standards specified by USEPA, ASTM, and so on, for explosives detection. The holistic development of analytical tools for explosive analysis ranging from conventional methods to advanced analytical tools is also covered in this article. The most important aspect of this review is to make forensic scientists familiar with the challenges during explosive analysis and the steps to avoid them. The problems during analysis can be analyte-based, that is, interferences due to matrix or added molding/stabilizing agents, trace amount of parent explosives in post-blast samples and many more. Others are techniques-based challenges viz. specificity, selectivity, and sensitivity of the technique. Thus, it has become a primary concern to adopt rapid, field deployable, and highly sensitive techniques.
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Affiliation(s)
- Bhumika Sharma
- Department of Applied Sciences & Humanities, Indira Gandhi Delhi Technical University for Women, Delhi, India
| | - Ranu Gadi
- Department of Applied Sciences & Humanities, Indira Gandhi Delhi Technical University for Women, Delhi, India
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Abstract
Quinoidal π-conjugated systems are sought-after materials for semiconducting applications because of their rich optical and electronic characteristics. However, the analogous fluorescent compounds are extremely rare, with just two reports in the literature. Here, we present the design and development of a third series of quinoidal fluorophores [(2,5-diarylidene)-3,6-bis(hexyloxy)-2,5-dihydropyrazine (Q1-Q5)] that incorporates p-azaquinodimethane. The fluorophores are synthesized in a two-step synthetic approach employing Knoevenagel condensation of N,N-diacetyl-piperazine-2,5-dione with different aromatic aldehydes followed by O-alkylation in high yields. Q1-Q5 are strongly emissive, and by altering the aryl-substituents, the emission colors can be modulated from blue to orange. The compounds possess emission maxima (λem) at 475-555 nm in the solution state and 510-610 nm in the solid state, with fluorescence quantum yields of up to 60%. To the best of our knowledge, the reported systems are the first quinoidal dual-state emissive (solution- and solid-state) compounds. In trifluoroacetic acid, Q5 exhibits halochromic behavior, with a dramatic color change from yellow to blue. Furthermore, the preliminary fluorescent sensing studies demonstrated that Q5 could act as a selective turn-off fluorescence probe for electron-deficient picric acid (PA), with an emission quenching of >90% in the solution state. The thin-layer chromatography (TLC) strip sensor of Q5 was also designed to detect PA in water.
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Affiliation(s)
- Aswani Raj K
- Department of Chemistry, Indian Institute of Technology Dharwad, Karnataka, 580011, India
| | - Rajeswara Rao M
- Department of Chemistry, Indian Institute of Technology Dharwad, Karnataka, 580011, India
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Soltani-Shahrivar M, Afkhami A, Madrakian T, Jalal NR. Sensitive and selective impedimetric determination of TNT using RSM-CCD optimization. Talanta 2023; 257:124381. [PMID: 36801757 DOI: 10.1016/j.talanta.2023.124381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Revised: 02/05/2023] [Accepted: 02/15/2023] [Indexed: 02/18/2023]
Abstract
Detection of trace amounts of 2,4,6-Trinitrotoluene as a widely used explosive in the military and industrial sectors is of vital importance due to security and environmental concerns. The sensitive and selective measurement characteristics of the compound still is considered a challenge for analytical chemists. Unlike conventional optical and electrochemical methods, the electrochemical impedance spectroscopy technique (EIS), has a very high sensitivity, but it faces a significant challenge in that it requires complex and expensive steps to modify the electrode surface with selective agents. We reported the design and construction of an inexpensive, simple, sensitive, and selective impedimetric electrochemical TNT sensor based on the formation of a Meisenheimer complex between magnetic multiwalled carbon nanotubes modified with aminopropyl triethoxysilane (MMWCNTs @ APTES) and TNT. The formation of the mentioned charge transfer complex at the electrode-solution interface blocks the electrode surface and disrupts the charge transfer in [(Fe (CN) 6)] 3-/4- redox probe system. Charge transfer resistance changes (ΔRCT) were used as an analytical response that corresponded to TNT concentration. To investigate the influence of effective parameters on the electrode response, such as pH, contact time, and modifier percentage, the response surface methodology based on central composite design (RSM-CCD) was used. The calibration curve was achieved in the range of 1-500 nM with a detection limit of 0.15 nM under optimal conditions, which included pH of 8.29, contact time of 479 s, and modifier percentage of 12.38% (w/w). The selectivity of the constructed electrode towards several nitroaromatic species was investigated, and no significant interference was found. Finally, the proposed sensor was able to successfully measure TNT in various water samples with satisfactory recovery percentages.
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Affiliation(s)
| | - Abbas Afkhami
- Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran; D-8 International University, Hamedan, Iran.
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Beeram R, Vendamani VS, Soma VR. Deep learning approach to overcome signal fluctuations in SERS for efficient On-Site trace explosives detection. Spectrochim Acta A Mol Biomol Spectrosc 2023; 289:122218. [PMID: 36512965 DOI: 10.1016/j.saa.2022.122218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 11/19/2022] [Accepted: 12/03/2022] [Indexed: 06/17/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is an improved Raman spectroscopy technique to identify the analyte under study uniquely. At the laboratory scale, SERS has realised a huge potential to detect trace analytes with promising applications across multiple disciplines. However, onsite detection with SERS is still limited, given the unwanted glitches of signal reliability and blinking. SERS has inherent signal fluctuations due to multiple factors such as analyte adsorption, inhomogeneous distribution of hotspots, molecule orientation etc. making it a stochastic process. Given these signal fluctuations, validating a signal as a representation of the analyte often relies on an expert's knowledge. Here we present a neural network-aided SERS model (NNAS) without expert interference to efficiently identify reliable SERS spectra of trace explosives (tetryl and picric acid) and a dye molecule (crystal violet). The model uses the signal-to-noise ratio approach to label the spectra as representative (RS) and non-representative (NRS), eliminating the reliability of the expert. Further, experimental conditions were systematically varied to simulate general variations in SERS instrumentation, and a deep-learning model was trained. The model has been validated with a validation set followed by out-of-sample testing with an accuracy of 98% for all the analytes. We believe this model can efficiently bridge the gap between laboratory and on-site detection using SERS.
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Affiliation(s)
- Reshma Beeram
- Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad, Hyderabad 500046, Telangana, India
| | - V S Vendamani
- Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad, Hyderabad 500046, Telangana, India
| | - Venugopal Rao Soma
- Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad, Hyderabad 500046, Telangana, India.
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Hu J, Chen C, Xie X, Zhang L, Song H, Lv Y. Instant Fingerprint Discrimination for Military Explosive Vapors by Dy 3+ Doping a La 2O 3-Based Cataluminescence Sensor System. Anal Chem 2023; 95:3516-3524. [PMID: 36730068 DOI: 10.1021/acs.analchem.2c05678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
With the intensification of explosive-based terrorism attack and environmental concerns, the innovation of high-efficiency and portable sensors for facile, rapid, and reliable monitoring of explosives has become one of the major demands in societies. Herein, a reliable and easy-to-use cataluminescence sensor system based on Dy3+ doping La2O3 nanorod catalysts has been developed for the identification and detection of six types of military explosive vapors, including homologous compounds and even isomers. The efficient discrimination is to make full use of the thermodynamic and kinetic information that can be extracted from the catalytic oxidation process of explosive molecules on various sensing materials, that is, the response signal and response time to generate the fingerprint of each target compound, while the rapid detection of the strategy can be manifested in response toward six military explosive vapors within 2.5 s and recover within 4 s. Meanwhile, the quantitative analysis of the explosives by the sensor system was realized based on 0.8%Dy:La2O3 with optimal catalytic activity, and the detection limits of NB, m-MNT, m-DNB, PNT, DNT, and TNT can reach 0.62, 0.49, 0.63, 0.38, 0.023, and 0.067 μg mL-1. In this research, we also constructed a novel sensor device and detection platform for explosive monitoring, which is of great significance for providing a new sensing principle for the efficient identification of explosives.
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Affiliation(s)
- Jiaxi Hu
- Analytical & Testing Center, Sichuan University, Chengdu 610064, China
| | - Cheng Chen
- Analytical & Testing Center, Sichuan University, Chengdu 610064, China
| | - Xiaobin Xie
- Analytical & Testing Center, Sichuan University, Chengdu 610064, China
| | - Lichun Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Hongjie Song
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Yi Lv
- Analytical & Testing Center, Sichuan University, Chengdu 610064, China.,Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
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Affiliation(s)
- Douglas J. Klapec
- Arson and Explosives Section I, United States Department of Justice, Bureau of Alcohol, Tobacco, Firearms and Explosives, Forensic Science Laboratory, 6000 Ammendale Road, Ammendale, MD, 20705, USA
| | - Greg Czarnopys
- Forensic Services, United States Department of Justice, Bureau of Alcohol, Tobacco, Firearms and Explosives, Forensic Science Laboratory, 6000 Ammendale Road, Ammendale, MD, 20705, USA
| | - Julie Pannuto
- United States Department of Justice, Bureau of Alcohol, Tobacco, Firearms and Explosives, Forensic Science Laboratory, 6000 Ammendale Road, Ammendale, MD, 20705, USA
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Maddocks S, Samuri NF, Ridge K, Cunningham ID, Lockley WJS. Benzylic deuteration of alkylnitroaromatics via amine-base catalysed exchange with deuterium oxide. J Labelled Comp Radiopharm 2023; 66:11-21. [PMID: 36453978 PMCID: PMC10107807 DOI: 10.1002/jlcr.4008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 11/24/2022] [Accepted: 11/28/2022] [Indexed: 12/03/2022]
Abstract
This paper describes the deuterium-labelling of alkylnitroaromatics by base-catalysed exchange with deuterium oxide. As the alkyl protons alpha to the aromatic ring are the most acidic sites in the molecule, regioselective hydrogen isotope exchange at this benzylic location leads to a regiospecifically deuterated product. The exchange labelling takes place in good yields and with high atom% abundance in the presence of an appropriate nitrogen base. Alkylated 2,4-dinitrobenzenes deuterate at room temperature under catalysis by triethylamine, whilst alkylated 2-nitro- or 4-nitrobenzenes and related mono-nitroaromatics require higher temperatures and catalysis by 1,5-diazobicyclo[4.3.0]non-5-ene (DBN). The labelling reactions require an inert gas atmosphere, but otherwise are simple and high yielding with no obvious byproducts. Those compounds in which the benzylic protons are in an ortho-orientation with respect to the nitro group label somewhat more slowly than the analogues where there is a para relationship. In addition, higher alkyl homologues undergo benzylic deuteration at slower rates than methyl.
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Affiliation(s)
- Stephen Maddocks
- Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, UK
| | - Nurul F Samuri
- Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, UK
| | - Katerina Ridge
- Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, UK
| | - Ian D Cunningham
- Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, UK
| | - William J S Lockley
- Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, UK
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Yuan YH, Gu HX, Xie QY, Zhang J. In-situ SERS detection of aromatic amine pollutants in fire-fighting wastewater using low-cost flexible substrates. Microchem J 2022. [DOI: 10.1016/j.microc.2022.108139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Bai H, Wen G, Liang A, Jiang Z. Ti 3C 2@Pd nanocatalytic amplification-polypeptide SERS/RRS/Abs trimode biosensoring platformfor ultratrace trinitrotoluene. Biosens Bioelectron 2022; 217:114743. [PMID: 36166889 DOI: 10.1016/j.bios.2022.114743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 09/16/2022] [Accepted: 09/18/2022] [Indexed: 11/24/2022]
Abstract
A new MXene supported Pd nanoparticles (Ti3C2@Pd) nanosol with good stability and strong catalysis was prepared by the two-step procedure. Experiment was found that Ti3C2@Pd could strongly catalyze the reduction of HAuCl4 by H2O2 to produce gold nanoparticles (AuNPs), with strong surface enhanced Raman scattering (SERS), resonance Rayleigh scattering (RRS) and surface plasmon resonance absorption (Abs). Coupled this new SERS/RRS/Abs trimode nanocatalytic indicator reaction with specific TNT polypeptide (PTTNT), a facile and selective trimode polypeptide biosensoring platform was established for the detection of ultratrace TNT, with a linear range of 1.1-66, 1.1-66 and 4.4-66 pmol/L TNT, and detection limit (DL) of 0.69, 0.97 and 3.36 pmol/L by SERS, RRS and Abs assay respectively. It has been used to detect TNT in wastewater and soil samples, with recovery of 98.7-106% and RSD of 6.22-8.77%. In addition, this biosensoring platform can be also used to assay glyphosate and estradiol, respectively.
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Affiliation(s)
- Hongyan Bai
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China; Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin, 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin, 541004, China; College of Pharmacy, Guilin Medical University, Guilin, 541199, China
| | - Guiqing Wen
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China; Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin, 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin, 541004, China.
| | - Aihui Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China; Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin, 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin, 541004, China
| | - Zhiliang Jiang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, China; Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin, 541004, China; Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin, 541004, China.
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12
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Bondarchuk SV. Theoretical study of the Meisenheimer and charge-transfer complexes formed upon colorimetric determination of nitroaromatic explosives. FirePhysChem 2022. [DOI: 10.1016/j.fpc.2022.09.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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Shumskaya A, Kozhina E, Bedin S, Andreev S, Kulesh E, Rogachev A, Yarmolenko M, Korolkov I, Kozlovskiy A, Zdorovets M, Belyaev V, Rodionova V, Panina L. Detection of Polynitro Compounds at Low Concentrations by SERS Using Ni@Au Nanotubes. Chemosensors 2022; 10:306. [DOI: 10.3390/chemosensors10080306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The identification of high-energy compounds in trace concentrations not only in the laboratory, but also in field conditions is of particular interest. The process should be clear, easy, and well-recognizable. We formed SERS-active substrates by using elongated nickel nanotubes synthesized by electrochemical deposition in the pores of ion-track membranes and coated them with gold for further application in the detection of low concentrations of analytes. The substrates were characterized using various techniques to determine the morphology of the nanotubes and modifying gold layer. The possibility of obtaining two types of gold-layer morphology was shown: in the form of a smooth film up to 20–50 nm thick and a coating with nanoneedles up to 250 nm long. The electric fields around the nanotubes were simulated at a laser wavelength of 532 nm to demonstrate the influence of the gold-layer morphology on the field distribution. The “needle” morphology was chosen to form the most effective SERS-active substrates for detection of low concentrations of aromatic polynitro compounds. The spectral peaks were identified by comparing the model and experimental Raman spectra at concentrations down to 10−5 M. Within this limit, all peaks (“fingerprints” of the substance) were clearly distinguishable.
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Li H, Hassan MM, Haruna SA, Zhang M, Chen Q, Lia H. A sensitive silver nanoflower-based SERS sensor coupled novel chemometric models for simultaneous detection of chlorpyrifos and carbendazim in food. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Ma Y, Deng M, Wang X, Gao X, Song H, Zhu Y, Feng L, Zhang Y. 2H–MoS2/Co3O4 nanohybrid with type I nitroreductase-mimicking activity for the electrochemical assays of nitroaromatic compounds. Anal Chim Acta 2022; 1221:340078. [DOI: 10.1016/j.aca.2022.340078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/22/2022] [Accepted: 06/08/2022] [Indexed: 11/16/2022]
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Dief EM, Hoffmann N, Darwish N. Electrochemical Detection of Dinitrobenzene on Silicon Electrodes: Toward Explosives Sensors. Surfaces 2022; 5:218-27. [DOI: 10.3390/surfaces5010015] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Detection of explosives is vital for protection and criminal investigations, and developing novel explosives’ sensors stands at the forefront of the analytical and forensic chemistry endeavors. Due to the presence of terminal nitro groups that can be electrochemically reduced, nitroaromatic compounds (NACs) have been an analytical target for explosives’ electrochemical sensors. Various electrode materials have been used to detect NACs in solution, including glassy carbon electrodes (GCE), platinum (Pt), and gold (Au) electrodes, by tracking the reversible oxidation/reduction properties of the NACs on these electrodes. Here, we show that the reduction of dinitrobenzene (DNB) on oxide-free silicon (Si–H) electrodes is irreversible with two reduction peaks that disappear within the successive voltammetric scanning. AFM imaging showed the formation of a polymeric film whose thickness scales up with the DNB concentration. This suggest that Si–H surfaces can serve as DNB sensors and possibly other explosive substances. Cyclic voltammetry (CV) measurements showed that the limit of detection (LoD) on Si–H is one order of magnitude lower than that obtained on GCE. In addition, EIS measurements showed that the LoD of DNB on Si–H is two orders of magnitude lower than the CV method. The fact that a Si–H surface can be used to track the presence of DNB makes it a suitable surface to be implemented as a sensing platform. To translate this concept into a sensor, however, it would require engineering and fabrication prospect to be compatible with the current semiconductor technologies.
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Kumar A, Sahoo SC, Mehta SK, Soni P, Sharma V, Kataria R. A luminescent Zn-MOF for the detection of explosives and development of fingerprints. Anal Methods 2022; 14:700-707. [PMID: 35099486 DOI: 10.1039/d1ay01977e] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A luminescent 3D metal-organic framework [Zn(NDA)(AMP)] = PUC1 (where, NDA = naphthalene-2,6-dicarboxylic acid and AMP = 4-aminomethyl pyridine) was synthesized under solvothermal conditions. The synthesized 3D framework was fully characterized with the help of different analytical techniques such as SCXRD, FTIR, TGA, PXRD, SEM, BET, etc. PUC1 exhibited a strong emission peak at 371 nm when excited at 290 nm and the resulting emission was efficiently quenched in the presence of various organic explosive substances like pentaerythritol tetranitrate (PETN), 2,4,6-trinitrophenyl-N-methylnitramine (Tetryl), trinitrotoluene (TNT), 1,3,5-trinitroperhydro-1,3,5-triazine (RDX), and 1,3,5,7-tetranitro-1,3,5,7-tetrazoctane (HMX). PUC1 revealed highly sensitive and selective detection of PETN and Tetryl with high quenching constant values of 0.1 × 106 and 0.12 × 105 M-1 and low detection limits of 0.315 and 0.404 μM respectively. The strong luminescent properties of PUC1 lead to its successful application in the development of latent fingermarks on different non-porous surfaces using the powder dusting method. The accuracy and applicability of the synthesized material were determined by developing fingerprints by using secretions from eccrine and apocrine glands on a glass slide and various other surfaces, followed by dusting the surfaces. The results so obtained were found to be very accurate and promising.
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Affiliation(s)
- Ajay Kumar
- Department of Chemistry, Panjab University, Chandigarh 160014, India.
| | | | | | - Parmod Soni
- Department of Chemistry, Terminal Ballistics Research Laboratory (TBRL), Defence Research and Development Organisation, Chandigarh 160003, India
| | - Vishal Sharma
- Institute of Forensic Science & Criminology, Panjab University, Chandigarh 160014, India.
| | - Ramesh Kataria
- Department of Chemistry, Panjab University, Chandigarh 160014, India.
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Xia Y, Lu T, Wang L, Mo J, Jin Y, Zhang L, Du S. Intrinsic Raman signal amplification for rapid identification and detection of methylglyoxal in manuka honey. Anal Chim Acta 2021; 1181:338902. [PMID: 34556229 DOI: 10.1016/j.aca.2021.338902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 07/16/2021] [Accepted: 08/01/2021] [Indexed: 11/20/2022]
Abstract
Methylglyoxal (MGO) is the primary material basis for the non-peroxide antibacterial activity (NPA) of manuka honey from New Zealand. Therefore, it is necessary to identify the quality or discriminate the grade of honey because no all manuka honeys on the market display the NPA. The current routine method employed for the detection of MGO involves high-performance liquid chromatography (HPLC) test. However, it requires long time (∼8 h) for sample derivatization. Herein, we report an intrinsic Raman signal amplification strategy for the rapid identification and detection of MGO by using silver-coated gold nanoparticles (Au@Ag NPs) along with a high selective surface-enhanced Raman scattering (SERS) probe 8-thioguanosine (8-TG). 8-TG is synthesized via the derivatization of 8-bromoguanosine (8-BG) with thiourea, and its Raman peak assignments were confirmed by computer simulation. The detection is performed through the Raman intensity ratio (I631/I700) variation of N2-(1-carboxyethyl)-thioguanosine (CETG) formed by the reaction between 8-TG and MGO on surface of Au@Ag NPs, where one CETG Raman intensity at 631 cm-1 increases while the other one at 700 cm-1 decreases oppositely. The opposite change not only yields an intrinsic Raman signal amplification, but also provides built-in correction. As a result, the proposed SERS method exhibits high sensitivity and accuracy. In addition, the whole analytical test is achieved within ∼20 min. The method can be used for the fast detection of MGO in manuka honey and discrimination of the honey grade.
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Affiliation(s)
- Yuhong Xia
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Tian Lu
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Liping Wang
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Jinling Mo
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Yang Jin
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu, 211166, China
| | - Liying Zhang
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.
| | - Shuhu Du
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu, 211166, China.
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20
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Guo JF, Zhang MY, Guo QZ, Yan GP, Liu LJ. Highly stable terbium(III)-based metal-organic framework for the detection of m-dinitroaromatics and Fe3+ in water. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120454] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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21
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Yang S, Fan W, Cheng H, Gong Z, Wang D, Fan M, Huang B. A dual functional cotton swab sensor for rapid on-site naked-eye sensing of nitro explosives on surfaces. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105398] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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22
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Pálmai M, Kim EB, Schnee VP, Snee PT. Charge carrier pairing can impart efficient reduction efficiency to core/shell quantum dots: applications for chemical sensing. Nanoscale 2020; 12:23052-23060. [PMID: 33179684 DOI: 10.1039/d0nr06329k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Semiconductor quantum dots (QDs) are bright fluorophores that have significant utility for imaging and sensing applications. Core QDs are often employed in chemosensing via redox processes that modulates their fluorescence in the presence of an analyte. However, such particles lack robust surface passivation and generally contain a sizable portion of nonfluorescent QDs, which is detrimental to the detection limit. We investigated an approach to "turn on" non-fluorescent core QDs by lightly overcoating them with a thin shell of a higher bandgap semiconductor. The shell augments the population of sensing chromophores and increases the emission lifetime; however, it simultaneously mollifies redox processes that are responsible for analyte sensitivity to begin with. This balancing act was successfully applied to enhance the sensitivity of CdZnS/ZnS QDs towards 2,4,6-trinitrotoluene (TNT). Unexpectedly, it was found that CdZnS/ZnS QDs with very thick shells retained substantial sensitivity to TNT. This observation may be due to close coupling of the reduced substrate with the QD hole that is enabled by the near-degeneracy of holes in the core CdZnS and ZnS shell. The ability of core/shell QDs to retain substantial reducing power may have implications for other applications that can benefit from the enhanced stability of robust core/shell nanomaterials.
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Affiliation(s)
- Marcell Pálmai
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607-7061, USA.
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Fan W, Yang S, Zhang Y, Huang B, Gong Z, Wang D, Fan M. Multifunctional Flexible SERS Sensor on a Fixate Gel Pad: Capturing, Derivation, and Selective Picogram Indirect Detection of Explosive 2,2',4,4',6,6'-Hexanitrostilbene. ACS Sens 2020; 5:3599-3606. [PMID: 33155795 DOI: 10.1021/acssensors.0c01908] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
2,2',4,4',6,6'-Hexanitrostilbene (HNS) is an explosive with better explosion performance than the well-known 2,4,6-trinitrotoluene (TNT). Surprisingly, unlike other nitroaromatic explosives, there are limited reports regarding the detection of the HNS, let alone sensing reports on surface residues. In this work, a multifunctional flexible SERS sensor was proposed for the indirect detection of HNS based on the transparent fixate gel pads. The sticky and flexible gel pad can effectively collect any HNS surface residues. The inherent amine groups within the gel pad of which the main ingredient is polyurethane can react with HNS to form the orange Meisenheimer-alike complex. The modification of Ag NPs with halide ions was screened for the best SERS performance. KI-modified-citrate-reduced Ag NPs showed selective but enormous SERS enhancement for the HNS derivative. The detection of HNS in the solution phase was explored, and a linear range of 0.01-25 ppm was achieved. The lowest detectable amount (LDA) of HNS was found to be 50 pg, making it one of the most sensitive methods in literature. It was successfully utilized for the HNS residues sensing on fingerprints and bags with LDAs of 5 and 200 ng, respectively. In addition, other explosives including TATB, LLM-105, RDX, HMX, FOX-7, and TNT were also examined to assess the selectivity of the fixate. It was found that the fixate showed excellent selectivity for HNS.
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Affiliation(s)
- Wanli Fan
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Shiwei Yang
- School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Yongzheng Zhang
- School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong 273165, China
| | - Bing Huang
- Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan 621999, China
| | - Zhengjun Gong
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Dongmei Wang
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
| | - Meikun Fan
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
- School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
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Wu J, Feng Y, Zhang L, Wu W. Nanocellulose-based Surface-enhanced Raman spectroscopy sensor for highly sensitive detection of TNT. Carbohydr Polym 2020; 248:116766. [DOI: 10.1016/j.carbpol.2020.116766] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 07/01/2020] [Accepted: 07/11/2020] [Indexed: 12/11/2022]
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Emmons ED, Guicheteau JA, Fountain AW, Tripathi A. Effect of substituents on surface equilibria of thiophenols and isoquinolines on gold substrates studied using surface-enhanced Raman spectroscopy. Phys Chem Chem Phys 2020; 22:15953-15965. [PMID: 32628226 DOI: 10.1039/d0cp01125h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of substituents on the surface adsorption equilibria of thiophenols and isoquinolines on gold substrates was studied using surface-enhanced Raman spectroscopy (SERS) in order to determine the effects of the localized dipole moments and charge donating/withdrawing properties on the binding affinity. Two common classes of molecules used in SERS studies were examined, which included substituted aromatic thiols and nitrogen heterocyclic aromatic molecules (azaarenes), due to their strong affinity for gold surfaces. Unsubstituted thiophenol in aqueous solution binds strongly to gold surfaces. Therefore, it is difficult to measure an equilibrium constant, since even at concentrations of 10-8 M nearly a complete self-assembled monolayer (SAM) forms. In contrast, substituted thiophenols with electron-withdrawing groups, such as halogenated thiophenols, bind much less strongly, allowing equilibrium constants to be obtained. It is believed that the substituent withdrawing charge away from the sulfur atom affects the adsorption/binding between the analyte and surface. Thiophenols substituted with electron donating groups behaved similar to unsubstituted thiophenol, where a SAM was observed at concentrations as low as 10-8 M. These functional groups did not hinder the ability of the sulfur groups to bind with gold. In addition, a series of bromine-substituted isoquinolines, a group of azaarene compounds, were measured to determine the effects that the bromine substituent has when it is bound to the two different rings and if position on the rings has an effect. The azaarene class of molecules, including isoquinoline, adsorbs less strongly than thiophenols, and a dual Langmuir isotherm phenomenon is observed where protonated and neutral bromoisoquinoline molecules occupy two different types of sites on Klarite substrates, which consist of inverted micro-pyramids on Si wafers with rough/nanostructured Au coatings. Protonated isoquinolines bind to nucleophilic sites on the substrates which tend to occur on flatter regions of the substrate. By contrast, neutral isoquinolines bind to electrophilic sites which are predominant near microscopic edges on the substrate. The presence of the bromine substituent and its position in the fused ring structure changes the Gibbs free energies of adsorption, depending on which ring the substituent is in. These results can help to guide the development of SERS for analytical applications by demonstrating how changes in functional groups can affect the equilibrium constants, which are critical for determining the effectiveness of SERS as a tool for trace detection of analytes.
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Affiliation(s)
- Erik D Emmons
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| | - Jason A Guicheteau
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| | - Augustus W Fountain
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
| | - Ashish Tripathi
- Research and Technology Directorate, U.S. Army CCDC Chemical Biological Center, Aberdeen Proving Ground, MD 21010-5424, USA.
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