101
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Zhang HX, Zhang JH. Voltammetric detection of nitroaromatic compounds using carbon-nanomaterials-based electrodes. CAN J CHEM 2011. [DOI: 10.1139/v10-064] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The morphology of glassy carbon surfaces was investigated by the atomic force microscope (AFM) method. Multi-wall carbon nanotubes (MWCNTs) were purified and investigated with a scanning electron microscope (SEM) and a transmission electron microscope (TEM). An electrochemical technique based on the glassy carbon electrode (GCE) or MWCNT-modified GCEs was used for the detection of nitroaromatic compounds (NACs), namely 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitrobenzene (TNB), 2,4-dinitrotoluene (2,4-DNT), and 1,3-dinitrobenzene (1,3-DNB). MWCNT-modified GCEs were more sensitive than GCEs to TNB, 2,4-DNT, and 1,3-DNB, with the detection limit down to ppb level, whereas the modified GCEs showed lower sensitivity to TNT. In varying degrees, the accumulation of nitro compounds can be promoted by MWCNT-modified GCEs in the detection process, a property which can be attributed to the large surface area and graphene-sheet structure of MWCNTs.
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Affiliation(s)
- Hong-Xia Zhang
- Department of Chemistry, Liaocheng University, Liaocheng 252059, P. R. China
| | - Jun-Hong Zhang
- Department of Chemistry, Liaocheng University, Liaocheng 252059, P. R. China
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102
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Zang J, Guo CX, Hu F, Yu L, Li CM. Electrochemical detection of ultratrace nitroaromatic explosives using ordered mesoporous carbon. Anal Chim Acta 2011; 683:187-91. [DOI: 10.1016/j.aca.2010.10.019] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Revised: 10/12/2010] [Accepted: 10/13/2010] [Indexed: 10/18/2022]
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103
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Lu X, Qi H, Zhang X, Xue Z, Jin J, Zhou X, Liu X. Highly dispersive Ag nanoparticles on functionalized graphene for an excellent electrochemical sensor of nitroaromatic compounds. Chem Commun (Camb) 2011; 47:12494-6. [DOI: 10.1039/c1cc15697g] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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104
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Guo CX, Lei Y, Li CM. Porphyrin Functionalized Graphene for Sensitive Electrochemical Detection of Ultratrace Explosives. ELECTROANAL 2010. [DOI: 10.1002/elan.201000522] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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105
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Fu XC, Chen X, Wang J, Liu JH, Huang XJ. Amino functionalized mesoporous silica microspheres with perpendicularly aligned mesopore channels for electrochemical detection of trace 2,4,6-trinitrotoluene. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.09.045] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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106
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Rezaei B, Damiri S. Using of multi-walled carbon nanotubes electrode for adsorptive stripping voltammetric determination of ultratrace levels of RDX explosive in the environmental samples. JOURNAL OF HAZARDOUS MATERIALS 2010; 183:138-144. [PMID: 20685041 DOI: 10.1016/j.jhazmat.2010.06.127] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2010] [Revised: 06/01/2010] [Accepted: 06/30/2010] [Indexed: 05/29/2023]
Abstract
A study of the electrochemical behavior and determination of RDX, a high explosive, is described on a multi-walled carbon nanotubes (MWCNTs) modified glassy carbon electrode (GCE) using adsorptive stripping voltammetry and electrochemical impedance spectroscopy (EIS) techniques. The results indicated that MWCNTs electrode remarkably enhances the sensitivity of the voltammetric method and provides measurements of this explosive down to the sub-mg/l level in a wide pH range. The operational parameters were optimized and a sensitive, simple and time-saving cyclic voltammetric procedure was developed for the analysis of RDX in ground and tap water samples. Under optimized conditions, the reduction peak have two linear dynamic ranges of 0.6-20.0 and 8.0-200.0 mM with a detection limit of 25.0 nM and a precision of <4% (RSD for 8 analysis).
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Affiliation(s)
- Behzad Rezaei
- Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
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107
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Nie D, Li P, Zhang D, Zhou T, Liang Y, Shi G. Simultaneous determination of nitroaromatic compounds in water using capillary electrophoresis with amperometric detection on an electrode modified with a mesoporous nano-structured carbon material. Electrophoresis 2010; 31:2981-8. [DOI: 10.1002/elps.201000275] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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108
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Guo CX, Lu ZS, Lei Y, Li CM. Ionic liquid–graphene composite for ultratrace explosive trinitrotoluene detection. Electrochem commun 2010. [DOI: 10.1016/j.elecom.2010.06.028] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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109
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Tredici I, Merli D, Zavarise F, Profumo A. α-Cyclodextrins chemically modified gold electrode for the determination of nitroaromatic compounds. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.03.036] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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110
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Shan X, Patel U, Wang S, Iglesias R, Tao N. Imaging Local Electrochemical Current via Surface Plasmon Resonance. Science 2010; 327:1363-6. [DOI: 10.1126/science.1186476] [Citation(s) in RCA: 265] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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111
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Díaz Aguilar A, Forzani ES, Leright M, Tsow F, Cagan A, Iglesias RA, Nagahara LA, Amlani I, Tsui R, Tao NJ. A hybrid nanosensor for TNT vapor detection. NANO LETTERS 2010; 10:380-384. [PMID: 20041699 DOI: 10.1021/nl902382s] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Real-time detection of trace chemicals, such as explosives, in a complex environment containing various interferents has been a difficult challenge. We describe here a hybrid nanosensor based on the electrochemical reduction of TNT and the interaction of the reduction products with conducting polymer nanojunctions in an ionic liquid. The sensor simultaneously measures the electrochemical current from the reduction of TNT and the conductance change of the polymer nanojunction caused from the reduction product. The hybrid detection mechanism, together with the unique selective preconcentration capability of the ionic liquid, provides a selective, fast, and sensitive detection of TNT. The sensor, in its current form, is capable of detecting parts-per-trillion level TNT in the presence of various interferents within a few minutes.
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Affiliation(s)
- Alvaro Díaz Aguilar
- Center for Bioelectronics and Biosensors, Biodesign Institute, and Department of Electrical Engineering, Arizona State University, Tempe, Arizona 85287, USA
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112
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Doménech A, Navarro P, Arán VJ, Muro B, Montoya N, García-España E. Selective electrochemical discrimination between dopamine and phenethylamine-derived psychotropic drugs using electrodes modified with an acyclic receptor containing two terminal 3-alkoxy-5-nitroindazole rings. Analyst 2010; 135:1449-55. [DOI: 10.1039/c0an00082e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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113
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Sun D, Xie X, Zhang H. Surface effects of mesoporous silica modified electrode and application in electrochemical detection of dopamine. Colloids Surf B Biointerfaces 2010; 75:88-92. [DOI: 10.1016/j.colsurfb.2009.08.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2009] [Revised: 08/04/2009] [Accepted: 08/10/2009] [Indexed: 10/20/2022]
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114
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Liu Y, Lan D, Wei W. Layer-by-layer assembled DNA-functionalized single-walled carbon nanotube hybrids-modified electrodes for 2,4,6-trinitrotoluene detection. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2009.09.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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115
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116
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117
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Maduraiveeran G, Ramaraj R. Potential Sensing Platform of Silver Nanoparticles Embedded in Functionalized Silicate Shell for Nitroaromatic Compounds. Anal Chem 2009; 81:7552-60. [DOI: 10.1021/ac900781d] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Govindhan Maduraiveeran
- Centre for Photoelectrochemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, India
| | - Ramasamy Ramaraj
- Centre for Photoelectrochemistry, School of Chemistry, Madurai Kamaraj University, Madurai-625 021, India
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118
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Riskin M, Tel-Vered R, Lioubashevski O, Willner I. Ultrasensitive Surface Plasmon Resonance Detection of Trinitrotoluene by a Bis-aniline-Cross-Linked Au Nanoparticles Composite. J Am Chem Soc 2009; 131:7368-78. [DOI: 10.1021/ja9001212] [Citation(s) in RCA: 210] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael Riskin
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Ran Tel-Vered
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Oleg Lioubashevski
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Itamar Willner
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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119
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Wang F, Yang J, Wu K. Mesoporous silica-based electrochemical sensor for sensitive determination of environmental hormone bisphenol A. Anal Chim Acta 2009; 638:23-8. [DOI: 10.1016/j.aca.2009.02.013] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2008] [Accepted: 02/07/2009] [Indexed: 10/21/2022]
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120
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JAVANBAKHT M, DIVSAR F, BADIEI A, GANJALI MR, NOROUZI P, MOHAMMADI ZIARANI G, CHALOOSI M, ABDI JAHANGIR A. Potentiometric Detection of Mercury(II) Ions Using a Carbon Paste Electrode Modified with Substituted Thiourea-Functionalized Highly Ordered Nanoporous Silica. ANAL SCI 2009; 25:789-94. [PMID: 19531889 DOI: 10.2116/analsci.25.789] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Mehran JAVANBAKHT
- Department of Chemistry, Amirkabir University of Technology
- Nano Science and Technology Research Center, Amirkabir University of Technology
| | | | - Alireza BADIEI
- School of Chemistry, University College of Science, University of Tehran
| | - Mohammad Reza GANJALI
- Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran
| | - Parviz NOROUZI
- Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran
| | | | | | - Ali ABDI JAHANGIR
- School of Chemistry, University College of Science, University of Tehran
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121
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Grigoriants I, Markovsky B, Persky R, Perelshtein I, Gedanken A, Aurbach D, Filanovsky B, Bourenko T, Felner I. Electrochemical reduction of trinitrotoluene on core–shell tin–carbon electrodes. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2008.07.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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122
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Anderson GP, Goldman ER. TNT detection using llama antibodies and a two-step competitive fluid array immunoassay. J Immunol Methods 2008; 339:47-54. [DOI: 10.1016/j.jim.2008.08.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2008] [Accepted: 08/05/2008] [Indexed: 11/25/2022]
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123
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A Simple Assay for Direct Colorimetric Visualization of Trinitrotoluene at Picomolar Levels Using Gold Nanoparticles. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200804066] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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124
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Jiang Y, Zhao H, Zhu N, Lin Y, Yu P, Mao L. A Simple Assay for Direct Colorimetric Visualization of Trinitrotoluene at Picomolar Levels Using Gold Nanoparticles. Angew Chem Int Ed Engl 2008; 47:8601-4. [DOI: 10.1002/anie.200804066] [Citation(s) in RCA: 292] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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125
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Affiliation(s)
- Benjamin J Privett
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
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126
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Walcarius A. Electroanalytical Applications of Microporous Zeolites and Mesoporous (Organo)Silicas: Recent Trends. ELECTROANAL 2008. [DOI: 10.1002/elan.200704144] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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127
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128
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Wang J, Liu G, Wu H, Lin Y. Sensitive electrochemical immunoassay for 2,4,6-trinitrotoluene based on functionalized silica nanoparticle labels. Anal Chim Acta 2008; 610:112-8. [PMID: 18267147 DOI: 10.1016/j.aca.2008.01.024] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2007] [Revised: 12/26/2007] [Accepted: 01/05/2008] [Indexed: 10/22/2022]
Abstract
We present a poly(guanine)-functionalized silica nanoparticle (NP) label-based electrochemical immunoassay for sensitively detecting 2,4,6-trinitrotoluene (TNT). This immunoassay takes advantage of magnetic bead-based platform for competitive displacement immunoreactions and separation, and use electroactive nanoparticles as labels for signal amplification. For this assay, anti-TNT-coated magnetic beads interacted with TNT analog-conjugated poly(guanine)-silica NPs and formed analog-anti-TNT immunocomplexes on magnetic beads. The immunocomplexes coated magnetic beads were exposed to TNT samples, which resulted in displacing the analog conjugated poly(guanine) silica NPs into solution by TNT. In contrast, there are no guanine residues releasing into the solution in the absence of TNT. The reaction solution was then separated from the magnetic beads and transferred to the electrode surface for electrochemical measurements of guanine oxidation with Ru(bpy)3(2+) as mediator. The sensitivity of this TNT assay was greatly enhanced through dual signal amplifications: (1) a large amount of guanine residues on silica nanoparticles are introduced into the test solution by displacement immunoreactions and (2) a Ru(bpy)3(2+)-induced guanine catalytic oxidation further enhances the electrochemical signal. Some experimental parameters for the nanoparticle label-based electrochemical immunoassay were studied and the performance of this assay was evaluated. The method is found to be very sensitive and the detection limit of this assay is approximately 0.1 ng mL(-1) TNT. The electrochemical immunoassay based on the poly[guanine]-functionalized silica NP label offers a new approach for sensitive detection of explosives.
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Affiliation(s)
- Jun Wang
- Pacific Northwest National Laboratory, Richland, WA 99352, United States
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129
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Tao S, Li Y, Li G, Yu C. A facile and efficient method for rapid detection of trace nitroaromatics in aqueous solution. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b802655f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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130
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Wen R, Zhang HX, Yan CJ, Yan HJ, Pan GB, Wan LJ. TNT adsorption on Au(111): electrochemistry and adlayer structure. Chem Commun (Camb) 2008:1877. [DOI: 10.1039/b719888d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2024]
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131
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{MSU/PDDA}n LBL assembled modified sensor for electrochemical detection of ultratrace explosive nitroaromatic compounds. Electrochem commun 2007. [DOI: 10.1016/j.elecom.2007.03.019] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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132
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Zhao F, Liu L, Xiao F, Li J, Yan R, Fan S, Zeng B. Sensitive Voltammetric Response ofp-Nitroaniline on Single-Wall Carbon Nanotube-Ionic Liquid Gel Modified Glassy Carbon Electrodes. ELECTROANAL 2007. [DOI: 10.1002/elan.200703865] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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133
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Walker NR, Linman MJ, Timmers MM, Dean SL, Burkett CM, Lloyd JA, Keelor JD, Baughman BM, Edmiston PL. Selective detection of gas-phase TNT by integrated optical waveguide spectrometry using molecularly imprinted sol–gel sensing films. Anal Chim Acta 2007; 593:82-91. [PMID: 17531827 DOI: 10.1016/j.aca.2007.04.034] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2006] [Revised: 04/13/2007] [Accepted: 04/18/2007] [Indexed: 11/22/2022]
Abstract
A chemical sensor was developed to detect the explosive 2,4,6-trinitrotoluene (TNT) utilizing planar integrated optical waveguide (IOW) attenuated total reflection spectrometry. Submicron thick films of organically modified sol-gel polymers were deposited on the waveguide surface as the sensing layer. Sol-gels were molecularly imprinted for TNT using covalently bound template molecules linked to the matrix through 1 or 2 carbamate linkages. Upon chemical cleavage of the template and displacement of the TNT-like pendant groups from the matrix, shape-selective binding sites were created that possess a primary amine group. The amine was used to deprotonate bound TNT yielding an anionic form that absorbs visible light. Binding of TNT and subsequent conversion to the anion results in the attenuation of light propagating through the waveguide, thus creating a spectrophotometric device. Sensitivity can be achieved by taking advantage of the substantial pathlength provided by the use of single mode IOWs. The limit-of-detection to gas-phase TNT was found to be five parts-per-billion (ppbV) in ambient air at a flow rate of 40 mL min(-1) given a 60 s sampling time. The sensor is highly selective for TNT due to the selectivity of binding site recognition of TNT and the subsequent generation of the TNT anion. Response to TNT is not reversible which results in an integrating sensor device which, in theory, can improve the ability to detect small amounts of the explosive if the exposure time is sufficient in length.
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Affiliation(s)
- Natalie R Walker
- Department of Chemistry, College of Wooster, Wooster, OH 44691, United States
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134
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135
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Zhang HX, Chen Q, Wen R, Hu JS, Wan LJ. Effect of Polycyclic Aromatic Hydrocarbons on Detection Sensitivity of Ultratrace Nitroaromatic Compounds. Anal Chem 2007; 79:2179-83. [PMID: 17269652 DOI: 10.1021/ac0618268] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) with different numbers of pi-electrons and geometric symmetry of pi-systems, including anthracene, phenanthrene, pyrene, triphenylene, perylene, benzo[ghi]perylene, and coronene, were chosen to modify glassy carbon electrodes (GCEs) by self-assembling. The self-assembled monolayer of PAHs was investigated by STM and was used in the electrochemical detection of nitroaromatic compounds (NACs). The results indicate that PAH-modified GCE shows higher sensitivity to NACs than an unmodified one. Among the seven different PAHs, coronene-modified GCE exhibits the highest sensitivity to 2,4,6-trinitrotoluene and 1,3,5-trinitrobenzene.
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136
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Tao S, Li G, Yin J. Fluorescent nanofibrous membranes for trace detection of TNT vapor. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b618122h] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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137
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Tao S, Li G, Zhu H. Metalloporphyrins as sensing elements for the rapid detection of trace TNT vapor. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b606061g] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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138
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Zhang HX, Hu JS, Yan CJ, Jiang L, Wan LJ. Functionalized carbon nanotubes as sensitive materials for electrochemical detection of ultra-trace 2,4,6-trinitrotoluene. Phys Chem Chem Phys 2006; 8:3567-72. [PMID: 16871348 DOI: 10.1039/b604587c] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This report demonstrates a novel electrochemical method for fast and sensitive detection of ultra-trace 2,4,6-trinitrotoluene (TNT) based on modified electrodes by functionalized MWCNTs. To fabricate new kind of functionalized MWCNTs material sensitive to TNT, our work first theoretically investigated the interaction between triphenylene (TP) and TNT by calculating their electrostatic potentials, and secondly characterized this interaction by the fluorescence spectra. The functionalized MWCNTs of TP-MWCNTs were thoroughly characterized by fluorescence and UV-visible spectra, and by analysing these results, the interaction between TP and MWCNTs was also examined. Electrochemical experiment suggests, compared to MWCNTs- and TP- modified electrodes, TP-MWCNTs-modified electrodes result in both fast response and enhanced sensitivity to TNT detection. These results show the attachment of TP on MWCNTs leads to better sensing unit with more receptor site to TNT, associated with the coordinative recognition of TP and MWCNTs to TNT, finally result in the improvement of response and sensitivity. And this improved recognition process is attributed to the geometric and electrostatic complementarity between TP and TNT. The present study demonstrates TP-MWCNTs-modified electrode holds promising and important implications for the detection of ultra-trace TNT.
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Affiliation(s)
- Hong-Xia Zhang
- Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, CAS, Beijing, 100080, China
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